954results about How to "Good corrosion inhibition" patented technology

The invention discloses an acid-cleaning inhibiter for cleaning a boiler and a use method thereof. The acid-cleaning inhibiter comprises the following components by weight percent: 2.0%-10.0% of acid liquor, 0.08-0.25% of urotropine, 0.04-0.15% of dimethylbenzene thiourea or thiourea, 0.01-0.05% of thiocyanate, 0.03-0.12% of dodecyl-cetyl phenmethyl chloride or bromide, 0.05-0.12% of a surface active agent and the balance of water. Acids suitable for the acid-cleaning inhibiter include hydrochloric acid, citric acid, sulphuric acid, hydrofluoric acid, aminosulfonic acid and phosphoric acid, which are suitable for boiler steel, mild steel, alloy steel and steam steel. The inhibition effect of the invention is over 98% with less toxicity under the boiler chemical cleaning condition, the value of LD50 (orally taken by mice) is 5.74 g / kg. The invention can be stored for 2 years, resistant Fe<3+> ion is 800 mg / kg in the acid cleaning. The preparation method has simple steps, easily obtained raw materials and convention operation.

The invention relates to a phosphorus-free corrosion and scale inhibitor, which is prepared from sodium molybdate, zinc salt, citrate, triethanolamine, benzotriazole (BTA), polyaspartic acid (PASP), polyepoxysuccinic acid (PESA), AA / AMPS terpolymer, solid alkali and water. The phosphorus-free corrosion and scale inhibitor inhibits corrosion of metals by forming oxidization type and precipitation type films on the surfaces of the metals, has the effect of inhibiting scale through chelation and dispersive action on salts causing scale in cooling water, is non-toxic and phosphorus-free, has easily biodegradable major organic compositions, does not cause environmental pollution and is not limited by phosphorus in emission.

The invention discloses aluminum alloy semisynthesis cutting liquid and a preparation method thereof. The aluminum alloy semisynthesis cutting liquid is composed by weight of 12%-20% of mineral oil, 9%-15% of surfactant, 8%-12% of antirust agent, 1%-2% of aluminum corrosion inhibitor, 3%-7% of lubricant, 8%-12% of extreme pressure agent, 0.5%-1% of defoamer, 0.5%-1% of fungicide and the balance, water. The preparation method includes sequentially adding the surfactant, the antirust agent, the aluminum corrosion inhibitor, the lubricant, the extreme pressure agent, the defoamer, the fungicide and the water into the mineral oil and evenly stirring and mixing the mixture to obtain the aluminum alloy semisynthesis. The aluminum alloy semisynthesis cutting liquid has excellent performance on aluminum corrosion inhibition performance, corrosion resistance, lubricant performance, anti-rust performance, defoaming performance, use period and the like.

The invention discloses a green compound corrosion and scale inhibitor used in a circulating cooling water system. The green compound corrosion and scale inhibitor comprises sodium humate, starch, polyaspartic acid or polyepoxysuccinic acid, maleic anhydride-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid or acrylic acid-acrylate-sulfonate, zinc salt (zinc sulfate or zinc chloride) and tdlyltriazole. The green compound corrosion and scale inhibitor not only solves the problems that the frequently-used organic phosphate type corrosion and scale inhibitor used in the circulating cooling water system easily causes eutrophication of surrounding waters due to the phosphorus discharge to further lead to red tide, environmental pollution and the like, but also achieves the same high scale-preventing rate and corrosion inhibiting efficiency of the organic phosphate type corrosion and scale inhibitor.

The invention discloses an acid washing corrosion inhibitor, which is characterized by comprising the following components in percentage by weight: 30 to 70 percent of mixed alkyl pyridine quaternary ammonium salt, 25 to 50 percent of alcohol, 1 to 4 percent of nonionic surfactant and the balance of water. Compared with the prior art, the acid washing corrosion inhibitor has the advantages that: a pharmaceutical byproduct is mixed with alkyl pyridine to perform modification so as to research the corrosion inhibitor; the acid washing corrosion inhibitor has higher water solubility; the corrosion inhibition effect of the acid washing corrosion inhibitor is superior to that of the common aldehyde ketone amine type corrosion inhibitor; the application temperature range of the acid washing corrosion inhibitor is wider than that of the aldehyde ketone amine type corrosion inhibitor; the aldehyde ketone amine type corrosion inhibitor is easy to carbonize under the condition of high temperature, so that the corrosion inhibition effect is influenced; and in addition, the acid washing corrosion inhibitor is lower in production cost compared with the aldehyde ketone amine type corrosion inhibitor, has a simple production process, has no generation of three wastes (waste water, waste gas and industrial residues) and meets the requirement for environmental friendliness.

The invention relates to a preparation method of acidizing corrosion inhibitor in a high-temperature and concentrated acid environment. The preparation method is used for an acidification technology in carbonate oil reservoir exploration and overcomes the problem that existing high-temperature acidification corrosion inhibitor is poor in solubility and dispersion in use and prone to coking. According to the technical scheme, firstly, formaldehyde, benzene methanamine, absolute ethyl alcohol and concentrated hydrochloric acid are added into a three-necked flask, and then the three-necked flask is placed into an oil bath pan with the temperature being 110 DEG C for conducting a reaction for 2 hours; then, acetophenone is added, the pH is adjusted to 4 through concentrated hydrochloric acid, a reaction is conducted for 4 hours, and a coarse mannich base is obtained; thirdly, a vacuum rotary evaporation instrument is utilized for purification, separation is conducted, and a mannich base intermediate is obtained; fourthly, after the intermediate obtained in step 3 is washed, benzyl chloride is added, a reaction is conducted for 6 hours at the temperature of 110 DEG C, evaporation and separation are conducted through the vacuum rotary evaporation instrument, and mannich base quaternary ammonium salt is obtained; finally, potassium iodide is added in the mannich base quaternary ammonium salt stirring process for conducting mixed distribution, and the high-temperature acidizing corrosion inhibitor is obtained. The acidizing corrosion inhibitor has good solubility and dispersion, can further improve corrosion inhibition efficiency and is good in stability.