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A kind of organic passivator for carbon steel pipeline or carbon steel pipe fittings and application method thereof

A technology of passivating 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: 2017-03-29
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 200g of ricinoleic acid, dissolve it in 500mL of water, then use 300g of monoethanolamine to adjust the pH of the solution to 8, and the product is ready. Dilute this product with desalinated water and prepare a 10% aqueous solution, and place the solution in a stainless steel tank with a length of 15 meters, a width of 2 meters and a height of 1 meter equipped with a heat exchanger and a circulation pump, and adopt the method of forced circulation Heat the passivator solution in the stainless steel tank to 80°C and maintain the temperature, then soak the carbon steel pipe that has been pickled and derusted in the solution in the stainless steel tank for 30 minutes, remove the carbon steel pipe, and rinse it dry with pure water. After drying, according to GB / T25149-2010 test method for the quality of carbon steel passivation 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 re...

Embodiment 2

[0016] Weigh 300g of ricinoleic acid, dissolve it in 400mL of water, then use 300g of diethanolamine to adjust the pH of the solution to 9, and the product is ready. According to the method of use in Example 1, take this product and prepare a 10% aqueous solution, passivate the pickled carbon steel pipeline at 80°C for 30 minutes, and after drying, chemically clean the medium carbon steel according to 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 22s (the national standard requires no less than 5s to be qualified). As a comparative reference, take a commercially available 3% sodium nitrite passivation agent, adjust the pH to 11 with ammonia water, passivate at room temperature 30°C for 2 hours, and chemically clean the passivation film of medium carbon steel according to GB / T25149-2010 industrial equipment The test method for quality measures that the tim...

Embodiment 3

[0018] Weigh 300g of ricinoleic acid, dissolve it in 500mL of water, then use 300g of triethanolamine to adjust the pH of the solution to 8.5, and the product is ready. According to the method of use in Example 1, take this product and prepare a 10% aqueous solution, passivate the pickled carbon steel pipeline at 80°C for 30 minutes, and after drying, chemically clean the medium carbon steel according to GB / T25149-2010 industrial equipment The test method for the quality of the passivation film measures the time for the red dot liquid to change from blue to red as 10s (the national standard requires no less than 5s to be qualified). As a comparative reference, take a commercially available 3% sodium nitrite passivation agent, adjust the pH to 11 with ammonia water, passivate at room temperature 30°C for 2 hours, and chemically clean the passivation film of medium carbon steel according to GB / T25149-2010 industrial equipment The test method for quality measures that the time fo...

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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 passivator used for carbon steel pipes or carbon steel pipe fittings and an application method thereof. Background technique [0002] The passivating agent is a preparation that makes the metal surface passivate. It can make carbon steel pipes, carbon steel pipe fittings or rectification towers after hydrochloric acid pickling or sulfamic acid pickling to form on the highly active metal surface. An organic film that prevents the metal oxidation reaction, thereby improving its corrosion resistance and increasing the product's aesthetics. 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 th...

Claims

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Application Information

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Patent Type & Authority Patents(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