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Organic passivator for carbon steel pipelines or carbon steel pipe fittings and application method thereof

A technology of passivation agent and carbon steel pipe, which is applied in the direction of metal material coating process, etc., can solve the problems of operator hazards and environmental pollution, and achieve good passivation effect

Active Publication Date: 2015-05-13
陕西凯利化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the well-known passivating agent in the industrial cleaning industry is a mixed solution of ammonia water and sodium nitrite, or is mainly composed of metal salts such as chromic acid, nitric acid, and sulfuric acid. Since sodium nitrite is a carcinogen, it is harmful to the body of the operator. There is a greater hazard, and at present, most of the passivation solutions in the industrial cleaning industry are neutralized to pH = 7 and discharged directly. A large amount of sodium nitrite is directly discharged into the environment. Concentrated in the body of people or animals, it will eventually lead to the occurrence of various strange diseases; and metal salts such as chromic acid, nitric acid, and sulfuric acid contain a large amount of heavy metal ions, and the discharge of passivation liquid wastewater will also cause serious pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh 200 g of ricinoleic acid, dissolve it in 500 mL of water, and use 300 g of monoethanolamine to adjust the pH of the solution to 8, and the product is ready. Dilute this product with demineralized water and prepare a 10% aqueous solution. Place the solution in a 15-meter-long, 2-meter-wide, and 1-meter-high stainless steel tank equipped with a heat exchanger and a circulating pump. Forced circulation is adopted. Heat the passivating agent solution in the stainless steel tank to 80°C and maintain the temperature, then soak the carbon steel pipes that have undergone pickling and rust removal in the solution in the stainless steel tank for 30 minutes, remove the carbon steel pipes, and rinse them with pure water. After drying, according to the GB / T25149-2010 test method for the quality of carbon steel passive film in chemical cleaning of industrial equipment, the time for the red dot liquid to change from blue to red is 30s (the national standard requires no less than 5...

Embodiment 2

[0016] Weigh 300 g of ricinoleic acid, dissolve it in 400 mL of water, and use 300 g of diethanolamine to adjust the pH of the solution to 9, and the product is ready. According to the usage method of Example 1, the product was prepared into a 10% aqueous solution, and the acid-washed carbon steel pipeline was passivated at 80°C for 30 minutes. After drying, the medium carbon steel was chemically cleaned in accordance with GB / T25149-2010 industrial equipment The passivation film quality test method determines that the time for the red dot liquid to change from blue to red is 22s (the national standard requires not less than 5s to be qualified). As a comparison reference, take a commercially available 3% sodium nitrite passivator, adjust the pH to 11 with ammonia water, passivate at room temperature 30℃ for 2h, and clean the passivation film of medium carbon steel in accordance with GB / T25149-2010 industrial equipment chemical cleaning The quality test method determines that the...

Embodiment 3

[0018] Weigh 300 g of ricinoleic acid, dissolve it in 500 mL of water, and then adjust the pH of the solution to 8.5 with 300 g of triethanolamine to prepare the product. According to the usage method of Example 1, the product was prepared into a 10% aqueous solution, and the acid-washed carbon steel pipeline was passivated at 80°C for 30 minutes. After drying, the medium carbon steel was chemically cleaned in accordance with GB / T25149-2010 industrial equipment The test method for the quality of the passivation film determines that the time for the red dot liquid to change from blue to red is 10s (the national standard requires no less than 5s to be qualified). As a reference for comparison, take a commercially available 3% sodium nitrite passivator, adjust the pH to 11 with ammonia water, passivate at room temperature 30℃ for 2h, and clean the passivation film of medium carbon steel in accordance with GB / T25149-2010 industrial equipment chemical cleaning The quality test metho...

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PUM

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Abstract

The invention discloses an organic passivator for carbon steel pipelines or carbon steel pipe fittings. The organic passivator is prepared from ricinoleic acid, water and mono ethanol amine and / or diethanol amine and / or triethanolamine, the organic passivator is placed in a stainless steel tank after being diluted by demineralized water, the passivator solution in the stainless steel tank is heated in a forced circulation method, and carbon steel pipelines or carbon steel pipe fittings are soaked in the solution in the stainless steel tank for a period of time after a pickling rust treatment to form organic passivation films on the surfaces of the carbon steel pipelines and the carbon steel pipe fittings. Compared with the prior art, the organic passivator disclosed by the invention has the advantages that the organic passivator is green and environmentally friendly and contains no cancerogenic substance sodium nitrite, the waste liquid can be safely discharged after being neutralized and the passivation effect is good.

Description

Technical field [0001] The invention belongs to the technical field of preparation of industrial cleaning agent products, and relates to an organic passivation agent for carbon steel pipes or carbon steel pipe fittings and an application method thereof. Background technique [0002] Passivation agent is a preparation that makes the metal surface passivated. It can make carbon steel pipes, carbon steel pipe fittings or distillation towers formed on the surface of its highly active metal after being pickled with hydrochloric acid or sulfamic acid. A layer of organic film that can prevent the metal oxidation reaction, thereby improving its corrosion resistance and increasing the appearance of the product. At present, the well-known passivation agent in the industrial cleaning industry is a mixed solution of ammonia water and sodium nitrite, or metal salts such as chromic acid, nitric acid, and sulfuric acid as the main components. Because sodium nitrite is a carcinogen, it is harmfu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/62
CPCC23C22/62
Inventor 黄述州康东平张文东
Owner 陕西凯利化工有限公司