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Surface anticorrosion treatment technology of carbon steel valve body for petroleum pipeline

A technology of oil pipeline and anti-corrosion treatment, applied in the field of surface treatment, can solve problems such as complicated steps, complicated winding process requirements, and inability to deal with large quantities of high-efficiency, so as to achieve the effect of improving service life and reducing maintenance and maintenance costs

Inactive Publication Date: 2015-08-12
SUZHOU XINWEI VALVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has complicated steps, and it is necessary to apply anti-corrosion paste first: directly apply anti-corrosion paste to the surface defects or depressions of the valve after the surface treatment is qualified, forming a smooth surface that is convenient for viscoelastic adhesive tape winding; then viscoelastic adhesive can be carried out The winding of the belt, and the winding process requires complex, skilled labor is required to handle, and it cannot be processed efficiently in large quantities

Method used

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  • Surface anticorrosion treatment technology of carbon steel valve body for petroleum pipeline

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The electroless nickel plating solution is composed of the following components by weight percentage: nickel sulfate 21.5%, lactic acid 28%, sodium acetate 21%, sodium hypophosphite 22%, propionic acid 2.2%, purified water 5.3%.

[0027] Use alkaline degreasing method to remove the oil on the surface of the valve body, then use 25% pickling solution for deep cleaning, and then rinse with pure water for 2 minutes. The valve body enters the plating tank filled with electroless nickel plating solution. The plating tank needs to be dust-proof and heat-preserved. The bonding force and surface hardness of the nickel-plated layer put the valve body into an electric heating oven, the temperature of the oven is controlled at 280°C, and it is cooled naturally after baking for 1.5 hours. In order to improve the surface finish, the valve body needs to be polished with polishing machine abrasive paste. Check whether the surface of the valve body is free of particles, no layers, no b...

Embodiment 2

[0029] The electroless nickel plating solution is composed of the following components by weight percentage: 22% nickel sulfate, 29% lactic acid, 22% sodium acetate, 23% sodium hypophosphite, 2.4% propionic acid, and 1.6% pure water.

[0030] Use alkaline degreasing method to remove the oil on the surface of the valve body, then use 25% pickling solution for deep cleaning, and then rinse with pure water for 3 minutes. The valve body enters the plating tank filled with electroless nickel plating solution. The plating tank needs to be dust-proof and heat-preserved. The bonding force and surface hardness of the nickel-plated layer put the valve body in an electric heating oven, the temperature of the oven is controlled at 290 ° C, and it is naturally cooled after baking for 1 hour. In order to improve the surface finish, the valve body needs to be polished with a polishing machine grinding paste. Check whether the surface of the valve body is free of particles, no layers, no bump...

Embodiment 3

[0032] The electroless nickel plating solution is composed of the following components by weight percentage: nickel sulfate 21%, lactic acid 26%, sodium acetate 21%, sodium hypophosphite 24%, propionic acid 2%, purified water 6%.

[0033] Use alkaline degreasing method to remove the oil on the surface of the valve body, then use 25% pickling solution for deep cleaning, and then rinse with pure water for 3 minutes. The valve body enters the plating tank filled with electroless nickel plating solution. The plating tank needs to be dust-proof and insulated, and the temperature is kept at 92°C. The bonding force and surface hardness of the nickel-plated layer put the valve body in an electric heating oven, the temperature of the oven is controlled at 300 ° C, and it is naturally cooled after baking for 1 hour. In order to improve the surface finish, the valve body needs to be polished with a polishing machine grinding paste. Check whether the surface of the valve body is free of p...

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Abstract

The invention discloses a surface anticorrosion treatment technology of a carbon steel valve body for a petroleum pipeline. The technology concretely comprises the steps of valve body oil removal, pickling, pure water cleaning, chemical nickel plating, pure water cleaning, heating treatment, polishing, examination, packaging and warehousing. The above mode is carried out, a reasonable raw material ratio is adopted, and chemical nickel plating of the carbon steel valve body is carried out, so the anticorrosion function of the surface of the valve body is improved above 10 times, the service life of a valve is greatly prolonged, and the subsequent unkeeping and maintaining cost of the valve body is obviously reduced.

Description

technical field [0001] The invention relates to the field of surface treatment, in particular to a surface anticorrosion treatment process for a carbon steel valve body used in oil pipelines. Background technique [0002] Oil pipeline valves are used in oil exploration and oil transportation. The oil pipeline valve body has been corroded by various chemical substances for a long time during use. The valve body itself is made of carbon steel structure, and its service life is greatly reduced under the long-term corrosion of chemical substances. Therefore, it is necessary to carry out anti-corrosion treatment for oil pipeline valves. [0003] The existing disclosed anti-corrosion method for oil and gas pipeline valves adopts the method of covering the surface of the valve with a viscoelastic anti-corrosion layer. This method has complicated steps, and it is necessary to apply anti-corrosion paste first: directly apply anti-corrosion paste to the surface defects or depressions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36
Inventor 袁江明蔡晓华李杰王建强
Owner SUZHOU XINWEI VALVES
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