127results about How to "Anti-corrosion effect" patented technology

The invention provides a method for electrodepositing an inhibitor anion intercalation hydrotalcite film on the surface of magnesium alloy. In a three-electrode system, a solution containing corrosion-inhibition anion intercalation hydrotalcite is used as electrolyte, magnesium alloy is used as a working electrode, a platinum sheet is used as a counter electrode, N2 is introduced at room temperature, the pH value of the electrolyte is 4.5 to 8.5, the scanning rate is 5 to 30mV / s, the scanning frequency is 5 to 15 times, and a hydrotalcite film is formed on the surface of the magnesium alloy by an electrodepositing method. In the invention, the corrosion-inhibition anion intercalation hydrotalcite forms a film on the surface of the magnesium alloy by the electrodepositing method, a protective film with the functions of adsorbing corrosive ions and releasing an inhibitor is formed on the surface of the magnesium alloy by the etching of trace Cl and the excellent adsorption and film formation characters of corrosion-inhibition ions, and the film layer has corrosion prevention character, has favorable binding property with a magnesium alloy basal body and can also be better bonded with an organic coating.

The invention relates to an oil-water medium corrosion inhibitor for corrosion control on an oilfield-production oil gas water collection and transmission system, which comprises 1-25% of bis quaternary ammonium salts of imidazoline and alkyl-tert ammonium, 0.5-10% of sulfhydryl alkyl acid, 1-15% of organic urea compound, 1-10% of thiocyanide, 1-15% of alkyl quaternary ammonium salts, 0-10% of fatty alcohol polyethenoxy ether, 0-10% of alkylphenol polyoxyethylene and the balance of water. The corrosion inhibitor can control the corrosion of the oilfield-production oil gas water collection and transmission system with different oil-water ratio media; and when the charging amount reaches 100 mg / L, the corrosion inhibition rate can reach 75% above, and the corrosion rate can be controlled at 0.076mm / a below, thereby solving the problems of small property change application range of oil well production solution media, low corrosion inhibition rate and influence of emulsification on demulsification in the corrosion inhibitor on the market.

The present invention belongs to the field of chemical technology, and discloses one kind of acid corrosion retardant. The acid corrosion retardant contains urotropine, thiourea, benzotriazole, mercaptobezothiazole, sodium silicate and water. The acid corrosion retardant of the present invention is developed based on that some acids and some metals have high corrosion retarding rate.

The invention relates to the technical field of pesticides and discloses a plant and animal-derived green environment-friendly pesticide and a preparation method thereof. The green environment-friendly pesticide is composed of wild plants, edible crops and animal bile, wherein the wild plants comprise Datura stramonium, castor seed and herba hydrocotylis wilfordi, the edible crops comprise king capsicum, garlic, Sichuan pepper and berberine, and the animal bile is fish bile, chicken bile or pig bile. The preparation method comprises the following steps: washing, crushing and squeezing the wild plants, carrying out chemical examination and extraction of alkaloid and screening out moisture impurities; washing and juicing or soaking the edible crops; washing an animal gallbladder and broking the animal gallbladder to obtain bile; and carrying out mixing and uniform stirring to obtain the pesticide. The pesticide prepared in the invention has bactericidal and anti-decay effects and the advantages of reasonable preparation, a cheap price, convenience in usage, capacity of being both sprayed and poured, no residual poison, no pollution, greenness and environment-friendliness and is applicable to poisoning of a variety of insects on a variety of plants like wheat, corn, cotton, fruit trees, vegetable, fruit and flowers and trees.

The high efficiency coal additive consists of desulfurizer, leavening agent, combustion adjuvant, smoke suppressor and corrosion inhibitor mixed together. The desulfurizer contains CaO, NH4HCO3, ZnO and SiO2; the leavening agent contains NaHCO3, KAl(SO4)2 .12H2O and acidified coal gangue; the combustion adjuvant contains Fe2O3, MgO, KCl, KMnO4 and NaNO3; the corrosion inhibitor is humic acid and NaNO3; and the smoke suppressor is also KMnO4. The high efficiency coal additive is mixed directly with coal for boiler, furnace, kiln, oven, etc. Detection shows that the high efficiency coal additive can result in desulfurizing rate of 85 %, save coal rate by14.77 %, raise heat efficiency by 9.19 %, lower carbon content of coal slag by 14.86 %,and reduce smoke, scale and corrosion by 90 %.

The invention discloses a reinforced concrete rust inhibitor, and relates to the technical field of building materials. The reinforced concrete rust inhibitor consists of the following components in percentage by weight: 10.0 to 15.0 percent of nitrite, 0.1 to 1.0 percent of sodium hexametaphosphate, 0.5 to 1.0 percent of diethylenetriamine, 0.8 to 1.5 percent of thiourea, 0.5 to 1.0 percent of sodium benzoate, 1.0 to 1.5 percent of naphthamine, 3.0 to 5.0 percent of triethanolamine, 5.0 to 1.0 percent of water reducing agent, 0.001 to 0.005 percent of air entraining agent, and the balance of water. The reinforced concrete rust inhibitor has the advantages of low consumption, capability of reducing the consumption of a single rust inhibitor and the like, and can be widely applied to fresh reinforced concrete structures of projects of harbors, railways, coastal buildings, civil buildings and the like. The durability and the comprehensive corrosion resistance of concrete can be promoted, the service life of a building is remarkably prolonged, and remarkable economic benefit and social benefit can be brought.

The invention discloses a high efficiency concrete composite admixture, which comprises the following components: by weight, 5%-20% of triethanolamine, 10%-15% of sodium lignin sulfonate, 2% - 3% of a naphthalene-series high efficiency water reducer, 1% - 2% of bone glue, 5% - 15% of tartaric acid, 2% - 3% of rosin, 3% - 5% of sodium dodecyl benzene sulfonate, and the balance of water. The high efficiency concrete composite admixture has the advantages of simple process and excellent performances.

The invention relates to a composite type reinforced concrete rust inhibitor. The composite type reinforced concrete rust inhibitor comprises the following components by weight percent: an anode type rust inhibitor adopts 20.0 to 30.0 percent of calcium nitrite and 10.0 to 15.0 percent of sodium benzoate; and a cathode type rust inhibitor adopts at least one of sodium hexametaphosphate and zinc oxide, wherein the cathode type rust inhibitor comprises 1.0 to 3.0 percent of sodium hexametaphosphate, 2.0 to 4.0 percent of zinc oxide, 0.001 to 0.005 percent of air entraining agent and the balance of volcanic ash. The rust inhibitor can effectively retard and prohibit the corrosion of reinforcing steel bars in reinforced concrete and can prohibit or delay the destruction of chlorine ions to a reinforced passivating film. The invention has the advantages of little use quantity, use quantity reduction of a single rust inhibitor and the like, is a high-efficiency concrete reinforcement rust inhibitor and can be widely applied to the fresh reinforced concrete structure of the engineering of seaports, railways, coastal buildings, civil buildings and the like.

The invention relates to graphene concrete and a preparation process thereof and solves technical problems of poor durability and proneness to corrosion of concrete in the prior art. The graphene concrete is prepared from, by weight, 150-220 parts of cement, 150-220 parts of sea sand, 225-330 parts of gravels, 5-18 parts of lignosulfonate, 40-100 parts of water, 10-40 parts of silicon powder, 15-45 parts of coal ash, 2-5 parts of graphene, 3-6 parts of oxidized graphene, 1-2.5 parts of magnesium powder, 2-12 parts of polypropylene fibers, 5-15 parts of carbon fibers and 0.5-1 part of ethyleneglycol. The graphene concrete is widely applied to the field of building materials.

The invention relates to the technical field of cosmetics and particularly relates to efficiently atomized spray having a function of skin care and a preparation method thereof. The spray has small droplet diameters and a narrow droplet diameter spectrum. The droplet movement speed is slow and the liquid use amount per unit area is uniform. The spray has a good skin care effect. The spray comprises purified water, glycerol, 1, 3-butanediol, 1, 3-propanediol, 1, 2-hexanediol, 1, 2-pentanediol, betaine, allantoin, polyglyceryl-10-isostearate, PPG-26-butanol polyether-26 / PEG-40 hydrogenated castor oil / water, saccharide isomeride / water / citric acid / sodium citrate, PCA cocoyl arginine ethyl ester, caprylic / capric triglyceride, nicotinamide, purslane extract, water / hydrolyzed royal jelly protein / butanediol, water / glycerol / 1, 2-hexanediol / 1, 2-pentanediol / beta-glucan, menthol lactate / menthol, methyl diisopropyl propionamide, and octanoyl hydroxamic acid / 1, 3-propanediol. The spray is used through a spray bottle, has good atomization effects, high efficiency of deposition on the skin and has good skin care effects.

The invention discloses a hyaluronic acid essence liquid, comprising the following components in percentage by weight: 0.01% sodium hyaluronate; 3.0%, hydrolyze sodium hyaluronate 0.01%-1.0%, acetylated sodium hyaluronate 0.01%-1.0%, sodium hyaluronate crosslink polymer 0.1%-10%, moisturizer 0.1%-15.0%, 0.1%-5% of a soothing repairing agent, stabilize 0.1%-5%, and that balance is purify water. Theessence solution can effectively solve the problems of high price and short moisturizing time of the existing essence solution.

The composition of high-efficiency composite additive for concrete is formed from (wt%) triethanolamine 10-50, sodium metnylene bis-naphthalene sulfonate 20-50, bone glue 4-8, tartaric acid 10-20, rosin 3-6, stearic and 8-10 and water 105-210. Said invention is low in cost, small in addition quantity, easy to transport and store and convenient for operation and construction, and said additive can resist the corrosion action of preembedded metal, can improve plasticity and workability of concrete, can greatly reduce water gain and segregation and can make poured concrete more homogeneous and compact, etc.

The invention discloses novel rod hydraulic head cutting and tail cutting scissors comprising a machine body. A plurality of support seats are fixedly connected to the lower end of the machine body. Two vertical rods are symmetrically arranged on the upper side of the machine body and are fixedly connected. The upper ends of the two vertical rods are jointly fixedly connected with an installationplate. Two second hydraulic oil cylinders are fixedly connected to the upper side of the installation plate. A lifting plate is arranged between the two vertical rods. The two vertical rods are each sleeved with a sliding barrel capable of moving up and down. Both the two sliding barrels are fixedly connected with the lifting plate. A cutter is fixedly connected to the lower side of the lifting plate. The novel rod hydraulic head cutting and tail cutting scissors are reasonable in structural design, excess materials cut off from the head and the tail can directly fall into a collection box tobe collected, manual picking and collection are not needed, the workload of a worker can be reduced, in addition, cutting fluid can be filtered and reused, the use effect of the cutting fluid is improved, and meanwhile, a blocking condition in a fluid storage cavity is avoided.

The invention discloses a building energy-saving thermal insulation material, which is characterized being prepared from the following raw materials by weight: 15-25 parts of cement, 15-20 parts of blast furnace water granulated slag, 35-40 parts of volcanic ash, 5-8 parts of surface function modified porous hollow aluminum oxide nanofibers, 2-4 parts of rare earth fluoride hollow nano ions, 3-6 parts of Lambda-cyhalothric acid modified aminated beta-cyclodextrin and 1-3 parts of a coupling agent. The invention also discloses a preparation method of the building energy-saving thermal insulation material. The building energy-saving thermal insulation material disclosed by the invention is excellent in comprehensive performance, strong in thermal insulation property, good in aging resistance, weather resistance and flame retardance, excellent in performance stability and mechanical property, green and environment-friendly in use, high in durability, weather resistance, corrosion resistance, freeze thawing resistance and reliability, and wide in application range.

The invention discloses a metal cutting fluid and a preparation method thereof. The corrosion inhibitor in the metal cutting fluid comprises an organic carboxylic acid amide salt, a silane coupling agent, a hydramine borate, fluozirconic acid or salts thereof / fluotitanic acid or salts thereof, and petroleum sulfonate. The metal cutting fluid has favorable universality, can simultaneously protect ferrous metals and nonferrous metals, can prevent metals from rusting or discoloring in the cutting process or after finishing cutting, has long-term antirust effects on ferrous metals, and has excellent lubricating property, cleaning property and cooling property.

The invention provides a rare earth permanent magnet with a multilayer composite electroplated coating and a composite electroplating method thereof. The rare earth permanent magnet includes a rare earth permanent magnet body, a first layer of nickel coating, a second layer of copper coating, a third layer of nickel coating and a fourth layer. An electroplating solution includes: 40-60g / L stannous pyrophosphate, 30-45g / L nickel chloride, 250-320g / L potassium pyrophosphate, and 20g / L glycine. The composite electroplated coating not only can play an anti-corrosion role of conventional electroplated nickel, but also has certain protection effect on the eyes of inspectors, and the uniform appearance and black and shiny color can reach certain decorative effect.

The invention discloses a surface treatment method of a conductive substrate. The surface treatment method comprises the following steps: carrying out one or two of pretreatments such as wire drawing, sand blasting or polishing on the surface of the conductive substrate; then carrying out primary electrophoretic coating or spraying treatment to form a layer of first-time electrophoretic paint or spraying paint with the color different from the original color of the conductive substrate; then carrying out primary laser carving or diamond carving treatment so as to form a first pattern exposing the original color of the conductive substrate and a second pattern with thinned primary electrophoretic (or spraying) paint; and next, carrying out roughing treatment including chemical roughing (weak acid or weak alkaline or a skin film) and physical roughing (plasma bombardment or sand blasting), then carrying out secondary electrophoretic coating or spraying treatment to form electrophoretic (or spraying) paint with color and high transparency or electrophoretic (or spraying) paint with no color and extremely-high transparency.

The invention discloses a water-based anti-corrosion paint. The water-based anti-corrosion paint is characterized by comprising the following components: bisphenol A / F type epoxy resin, polyamidoamine, calcium borate silicates, titanium dioxide, barium sulfate, mica and deionized water, wherein calcium borate silicate powder is prepared by the steps of mixing calcium carbonate, silicon dioxide and boric acid for 24 hours according to the mass ratio of 4:5:1, melting in a platinum crucible at 1350-1500 DEG C for 0.5-2 hours, pouring in deionized water for quenching into calcium borate silicates fragments, grinding by an ultrasonic grinder and sieving with a 100 meshes sieve to obtain the calcium borate silicate powder. Due to adoption of the technical scheme, the environment pollution caused by zinc and phosphate in the existing anti-corrosion paint can be effectively solved, and the anti-corrosion agent can achieve an anti-corrosion effect on three aspects including physics, chemistry and electrochemistry.

The invention relates to a steel-structure high lamp column foot protection device and a manufacturing method thereof, and belongs to the technical field of building engineering and safety protection. According to the steel-structure high lamp column foot protection device and the manufacturing method thereof, the structure is simple, use is convenient, a column foot can be effectively protected, the anticorrosion effect is good, and the protection effect is good. According to the technical scheme, the column foot can be subject to anticorrosion treatment, the portion within the range of a column foot bolt, a stiffened plate and the like is filled with expansion vermiculite concrete, preformed holes with dehumidifying and positioning functions are reserved, a waterproof mortar protection layer is smeared, and the protection device is formed; and the protection device is of a structure with the upper portion smaller than the lower portion, and weather-resisting sealing glue exists in the joint portion of the protection device and a lamp column. The column foot protection device is fragile in core and hard in shell and is easy to open and convenient to maintain and use. The protection device is widely applied to protection of steel-structure column feet of high lamp columns in public places like a stadium.

The invention relates to a pre-mixed mortar material for buildings and particularly relates to high-efficiency corrosion resistant pre-mixed mortar. The mortar is prepared by mixing the following ingredients in percentages by weight: 5-20% of river sand, 10-30% of manufactured sand, 10-20% of flyash, 10-20% of granulated blast-furnace slag powder, 1-2% of polycarboxylic acid, 1-2% of sodium gluconate, 5-15% of cement, 5-15% of redispersible powder, 5-10% of kaolin and 5-10% of an electrolytic manganese slag waste. By using the pre-mixed mortar prepared at the ratio, the prepared concrete has the characteristics of being hard, corrosion-resistant and low in cost, and has wide applicability.

The invention discloses a water storage type grass planting brick for municipal environmental protection and a laying method thereof, and belongs to the technical field of grass planting bricks and laying. The water storage type grass planting brick for municipal environmental protection comprises a brick body, wherein a gravel permeable layer and a geotextile layer are laid on the upper end of the brick body in sequence. An annular permeable cavity, a water storage cavity and a grass planting hole which communicate with one another are formed in the brick body, the water storage cavity is used for collecting natural rainwater and slowly releasing the natural rainwater into the grass planting hole so as to provide moisture nutrients for vegetation grass, and a high-strength water retentioncone is embedded into the corner in the grass planting hole, so that one one hand, a water retention effect is achieved on water guided into the grass planting hole, on the other hand, a fastening effect is achieved on planting soil and the vegetation grass which are filled in the grass planting hole, and the water in the grass planting hole is effectively prevented from running off too fast; anda semicircular water cavity and a diversion hole which communicate with each other are formed, so that the natural rainwater can be conducted and evacuated as soon as possible during excessive rainfall, and excessive rainwater is not easy to remain on the surface of the brick.

The invention discloses an efficient corrosion-resistant motor vehicle antifreeze fluid and a preparation method thereof. The anti-freezing fluid is prepared from the following components in percentage by mass: 50-60% of ethylene glycol, 15-25% of glycerol, 0.1-0.15% pf benzotriazole, 0.5-1.5% of sodium pentachlorophenol, 0.5-1% of soldium salicylate, 1.5-2% of propenoic acid, 0.01-0.1% of rare-earth salt, 0.01-0.01% of an anti-foaming agent, 0.005-0.01% of a dye and the balance of deionized water. The preparation method comprises the following steps: dissolving deionized water, ethylene glycol, glycerol, rare-earth salt, the anti-foaming agent and the dye in a mixed mode; heating to 25-35 DEG C; adding other components till the mixed solution is clarified; fully stirring and dissolving in a mixed mode; heating to 50-60 DEG C; insulating for 45-60 minutes under the condition that the vacuum degree is 0.02-0.03 MPa. The efficient corrosion-resistant motor vehicle antifreeze fluid provided by the invention has the characteristics of low freezing point, high boiling point and strong anticorrosive property, and can meet the using requirements of automobiles under different environment conditions.

The invention discloses a recovery method and a recovery device for discharged cooling water. The objective of the present invention, in addition to avoiding a problem of discharging phosphorous included in RO membrane concentrated water, is to improve and stabilize water recovery rate when performing RO membrane treatment and water recovery for discharged cooling water, such as blow water, of a circulating cooling water system. Water discharged from the circulating cooling water system is treated by a water recovery system comprising clarification equipment and an RO membrane, and during water recovery, wherein treated water is returned to the circulating cooling water system, a substance which passes through the clarification equipment and includes a polymer comprising a carboxyl group having a weight average molecular weight of 5,000 or less is added to the circulating cooling water system and used as a dispersing agent for dispersing scale components. The polymer comprising a carboxyl group having a weight average molecular weight of 5,000 or less passes through the clarification equipment and, as a scale dispersing agent for the RO membrane, can suppress precipitation of scale. Since the polymer intrinsically has an anticorrosion effect, it becomes unnecessary to add a phosphoric acid compound to the cooling water system as an anticorrosion agent, or the required amount ofthe compound to be added can be minimized, thereby suppressing an increase in phosphorous concentration in the RO membrane concentrated water.

The invention relates to the technical field of heat exchange copper tubes and particularly discloses a heat exchange copper tube provided with straight internal threads. The heat exchange copper tube provided with the straight internal threads comprises a copper tube body. A plurality of right-angled teeth are arranged on the inner side of the copper tube body in the circumferential direction. The two side edges of each right-angled tooth are a supporting straight edge and an expanding bevel edge intersecting with the supporting straight edge, wherein the extension line of the supporting straight edge passes through the center of the circle of the copper tube, the supporting straight edge is connected with the expanding bevel edge in a circular arc transmission on the top of the right-angled tooth. The addendum angle of each right-angled tooth is 45 degrees. The right-angled teeth are stretched along the axis of the copper tube to form straight racks. A straight tooth groove is formed between every two adjacent straight racks. A spiral guide groove penetrating the straight racks is formed in the copper tube body. The spiral guide groove extends from one end of the copper tube body to the other end of the copper tube body. A turbulence tooth group is further arranged on the inner side of the copper tube body, and the turbulence tooth group and the spiral guide groove extend in a double-helix shape. The turbulence tooth group comprises a plurality of turbulence tooth teeth located in the straight tooth grooves. By the adoption of the heat exchange copper tube provided with the straight internal threads, tooth patterns can be prevented from being damaged in the tube expanding process, the flowing resistance is reduced, the flowing turbulence degree is increased, the heat exchange efficiency is improved, and the heat exchange copper tube provided with the straight internal threads is convenient to machine.

Belonging to the technical field of environmental protection and resource utilization of solid waste, the invention particularly relates to a method for preparation of a calcium magnesium hydrochloride snow-melting agent from two-alkali salt sludge. The method includes: firstly subjecting waste hydrochloric acid and two-alkali salt sludge to stirring reaction at room temperature, then filtering the reaction system, conducting pressure reduced concentration on the obtained filtrate, and adding a corrosion inhibitor and performing mixing, then transferring the mixture into a fluidized bed spray granulation drying machine to conduct drying granulation, thus obtaining the calcium magnesium hydrochloride snow-melting agent. The method provided by the invention realizes recycling of salt sludge solid waste, makes waste profitable, and greatly reduces the production cost of the snow-melting agent. Also, the existing trace ions play a significant synergistic role in enhancing the snow-melting and deicing ability.

The invention provides a water injection well long-acting augmented injection acid technology. Through a mode of combining local pressure lifting with acidification, the problem of low pressure injection or no injection is solved, and purposes of comprehensive treatment and increasing the amount of injected water are achieved. The method does not need to take off a pipe string and flowback well washing is not required. II type chelating acid has strong chelating property, in the acid-rock reaction process, Ca<2+>, Mg<2+>, Fe<3+> and other metal ions can be chelated to avoid secondary or tertiary precipitation generation, the rust inhibition (less than 3.0g / (m<2>.h)) is low at the same time, and the pipe string in a wellbore cannot be corroded to bring downhole accident.

The invention relates to a high-temperature-resistant anti-corrosion anti-coking coating with a composite structure and a spraying method. The high-temperature-resistant anti-corrosion anti-coking coating comprises a metal coating coated on the surface of a metal pipe wall and a ceramic coating sprayed on the surface of the metal coating, the metal coating is formed by thermally spraying metal composite powder, and the metal composite powder comprises alloy powder and zirconium oxide micro powder in a weight ratio of (10-20): 1; the ceramic coating is formed by cold spraying ceramic composite powder on the surface of the metal coating, and the ceramic composite powder comprises the following components by weight, 30-50 parts of silicon carbide micro powder, 10-25 parts of aluminum oxide micro powder, 15-35 parts of zirconium oxide micro powder and 10-20 parts of zirconium boride micro powder. The zirconium oxide micro powder in the metal coating is embedded in the metal coating in a molecular embedding mode to achieve the effect of adjusting the thermal expansion coefficient, an outer layer and a metal pipe wall are tightly connected, the binding force of the coating and the pipe wall can be improved, and a certain anti-corrosion effect can be achieved. The ceramic coating is sprayed at normal temperature and then used at high temperature to form a ceramic membrane, so that the effects of corrosion prevention and coking prevention are achieved.

The invention provides a retarding acidification system. The retarding acidification system comprises a retarding admixture, wherein the retarding admixture is synthesized through a Mannich reaction of polyethylene polyamine, formaldehyde and phosphorous acid. A multi-hydrogen acid retarding acidification system is adopted, and the molecular structure of the retarding acidification system comprises multiple phosphate groups which can provide multiple H<+>. Compared with other acidic solutions, the retarding acidification system has more excellent performance including more excellent retarding performance, longer penetration distance, lower clay corrosion rate, higher quartz corrosion rate and capability of inhibiting secondary precipitation and has the advantages of being good in corrosion inhibition and chelating property, low in viscosity and the like. The retarding acidification system further has better corrosion capability when acid liquor reaches the deep stratum, and further, the acidification effect of the high-retardancy acidification system is improved.

The invention belongs to the technical field of metal surface treatment, and discloses an anti-corrosion composite coating on the surface of magnesium alloy and a preparation method and application thereof. The structure of the composite coating on the surface of the magnesium alloy is magnesium alloy / MgAl-LDH / Al2O3 / Ni / Zn-G / compact coating Zn5 (OH) 8Cl2-Zn4CO3 (OH) 6. According to the anti-corrosion composite coating on the surface of the magnesium alloy and the preparation method and application thereof, an LDH film is grown on a magnesium alloy matrix in situ in advance, then a Zn-G / Ni / Al2O3 coating is cold-sprayed, a Zn-G / Ni / Al2O3 / MgAl-LDH composite coating is prepared on the surface of the magnesium alloy, the composite coating is soaked in a sodium chloride solution, and a Zn5 (OH) 8Cl2 and Zn4CO3 (OH) 6 compact coating is generated on the surface of the Zn-G / Ni / Al2O3 coating. The MgAl-LDH coating of the composite coating has strong binding force with the magnesium alloy, and the corrosion resistance is excellent.

The invention discloses a surface treatment method of a conductive substrate. The surface treatment method comprises the following steps: carrying out one or two of pretreatments such as wire drawing, sand blasting or polishing on the surface of the conductive substrate; then carrying out primary electrophoretic coating or spraying treatment to form a layer of first-time electrophoretic paint or spraying paint with the color different from the original color of the conductive substrate; then carrying out primary laser carving or diamond carving treatment so as to form a first pattern exposing the original color of the conductive substrate and a second pattern with thinned primary electrophoretic (or spraying) paint; and next, carrying out roughing treatment including chemical roughing (weak acid or weak alkaline or a skin film) and physical roughing (plasma bombardment or sand blasting), then carrying out secondary electrophoretic coating or spraying treatment to form electrophoretic (or spraying) paint with color and high transparency or electrophoretic (or spraying) paint with no color and extremely-high transparency.