34results about How to "Protection against corrosion" patented technology

The invention relates to an engine coolant composition, and a method of increasing the operational life of a coolant composition in an engine, wherein an isononanoic acid is incorporated into the generally glycol based coolant fluid in place of nitrous acid or its salt to reduce pitting corrosion on iron containing surfaces.

The invention relates to a stainless steel equipment cleaning agent. The stainless steel equipment cleaning agent comprises the following effective components in parts by weight: 5-8 parts of polyglycolic acid, 7-10 parts of biochemical fulvic acid and 2-5 parts of amino acetic acid, wherein water is added for complementing into 100 parts, so that a cleaning solution can be prepared. A method for cleaning stainless steel equipment by utilizing the cleaning agent comprises the following steps: (1) preparing raw materials: weighing the following components in parts by weight: 5-8 parts of polyglycolic acid, 7-10 parts of biochemical fulvic acid, 2-5 parts of amino acetic acid and balance of water, wherein the total parts by weight of polyglycolic acid, biochemical fulvic acid, amino acetic acid and water is 100 parts; (2) taking two thirds of water and heating to 50 minus or plus 5 DEG C, adding amino acetic acid and uniformly stirring, adding biochemical fulvic acid, and stirring for dissolution, so that a solution A is obtained; (3) taking the rest of water, adding polyglycolic acid, and stirring for dissolution, so that a solution B is obtained; (4) introducing the solution A into equipment to be cleaned and circulating for 5-10 minutes, and then introducing the solution B and carrying out circulation cleaning. The stainless steel equipment cleaning agent has few components, is environment-friendly and produces less corrosion to the equipment, and descaling rate is more than 98%.

The invention relates to a preparation method of a core-shell ceramsite fracturing proppant for oil and gas collection, comprising: (1) pulverizing municipal sludge containing organic matter, then granulating and drying to obtain a core precursor. (2) Mix clay and scrap iron powder evenly, then add water and stir evenly to obtain inner coating layer slurry. (3) Mix the clay and water and stir evenly to obtain the outer coating layer slurry. (4) Immerse the core precursor in the inner coating layer slurry to make the outer surface uniform, then take out the inner core precursor to dry, and then immerse the obtained particles in the outer coating layer slurry to make the outer surface uniform Hang the slurry, then take out the particles and dry them. After the completion, arrange the particles evenly, and then calcinate. After the completion, the ceramsite fracturing proppant is obtained. The core-shell type fracturing proppant of the present invention not only has low density, but also has good compression resistance, and realizes the purpose of reducing the density of the fracturing proppant while maintaining its good compression resistance.

The invention discloses a zinc-galvanizing and paint-spraying coating process for a submerged boat carrier, which comprises the following steps of: (1) sand blasting treatment for a base material; (2) hot zinc-galvanizing treatment; (3) roughening treatment for a zinc-galvanized layer; (4) spraying a base paint; and (5) spraying a finish paint. In the process, a workpiece is subjected to zinc galvanizing, and a zinc layer is an anode coating which has a function of electrochemical protection; by the hot zinc-galvanizing treatment for the base material, the corrosion resistance of the product is greatly improved; the sand blasting treatment for the base material before the zinc-galvanizing treatment, the natural cooling treatment after the zinc-galvanizing treatment and the sand blasting treatment before paint spraying respectively improve the adhesive force between the base material and the zinc layer, and between the zinc layer and the paint, and guarantee the surface quality; and the surface of the zinc-galvanized workpiece is sprayed with the antirust paint so as to effectively protect the base material, prevent rust and corrosion, prolong the service life and meet requirements on special working environment of the submerged boat carrier and other large-scale mechanical parts.

The invention discloses a silt stripping method for a circulating cooling water system, which comprises the following steps of: preparing a silt stripping auxiliary agent by using sodium dodecyl benzene sulfonate, triethanolamine, polydimethyl silicon ether, sodium polyacrylate and water, adding the silt stripping auxiliary agent into cooling water in a ratio of 400 to 500mg / L for one-time circulation, adding a strong oxidizing agent into the normal circulating cooling water in a ratio of 2,000 to 3,000mg / L, and injecting clear water into the cooling water while circulating when the turbidityreaches a peak value to displace suspended matters in the cooling water. The consumption of the strong oxidizing agent is relatively reduced by 40 to 60 percent, the washing rate reaches over 99 percent, and the service life of the circulating cooling water system is prolonged, so the silt stripping method for the circulating cooling water system has the advantages of low strong oxidizing agent consumption, low metal pipeline corrosion, high washing rate, safe system operation and capability of prolonging the service life of the system.

The invention relates to a normal temperature spraying detergent for aluminum alloy and a preparation method thereof. The detergent comprises the following raw materials in percentage by weight: 1 to 5 percent of ethylene diamine tetraacetic acid, 0.5 to 1.5 percent of sodium metasilicate pentahydrate, 5 to 8 percent of sodium gluconate, 5 to 10 percent of heterogeneous alcohol ether, 2 to 7 percent of solubilizing agent, 3 to 8 percent of surfactant, and the balance of water. The detergent can be used at normal temperature, and does not need heating so as to save the energy; the detergent does not corrode the treated aluminum alloy parts, does not leave white spots on the surfaces of the parts, and can increase the brightness of the parts; and the detergent has long service life and low using concentration, is safe and environment-friendly, saves the working time, and improves the working efficiency.

The invention aims at providing a method for improving resistance of martensite heat-resistant steel to liquid metal corrosion. The method is characterized in that an enamel powder layer is sprayed to the surface of the martensite heat-resistant steel, and an enamel coating is prepared after a curing reaction is made. The surface of the martensite heat-resistant steel is treated through the method, the liquid metal corrosion resistance of metal can be effectively improved, and the service life of a metal material is prolonged.