Corrosion resistance seamless steel pipe treatment process

Abstract

The present invention relates to a corrosion resistance seamless steel pipe treatment process, which adopts a pipe billet molding treatment, a washing treatment, a pipe material nickel-electroplating treatment, a chromium plating treatment and double tests, wherein the nickel electroplating is performed on the surface of the pipe material, the plating solution comprises 290-300 g / l of nickel sulfate, 43-45 g / l of nickel chloride, and 42-45 g / l of boric acid, the adopted first-stage current is 1200 A, the first-stage time is 3 min, the adopted second-stage current is 2400 A, and the second-stage time is 5 min. With the method, the excellent performance stably meeting the salt spray test of more than or equal to class 7 can be achieved, the use requirement of the special motor vehicle part in the coastal area is met, the substantially technical progress is provided compared with the conventionally-used single hard chromium electroplating, and the corrosion resistance of the motor vehicle part is increased.

Description

technical field [0001] The invention relates to seamless steel pipes, in particular to a surface treatment process for special steel pipes for motor vehicle parts. Background technique [0002] At present, the existing production technology for special steel pipes for motor vehicles usually adopts the method of electroplating hard chromium to improve the corrosion resistance. Although electroplating hard chromium can meet the general anti-corrosion requirements, when it is rated according to the national standard (GB / T10125 and 6461), The standard of hard chrome plating treatment is 3-6, and the quality is unstable, especially in coastal areas, due to the humid climate and salt content, after six months of use, the surface of some pipe fittings will be severely corroded, thus shortening the length of the parts. Therefore, how to improve the corrosion resistance of steel pipes for motor vehicles through physical or chemical treatment in the process of making pipe fittings has...

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Problems solved by technology

[0002] At present, the existing production technology for special steel pipes for motor vehicles usually adopts the method of electroplating hard chromium to improve the corrosion resistance. Although electroplating hard chromium can meet the general anti-corrosion requirements, when it is rated according to the national standard (GB / T10125 and 6461), The standard of hard chrome plating treatment is 3-6, and the quality is unstable, especially in coastal areas, due to the humid climate and salt content, after six months of use, the surface of some pipe fittings will be severely corroded, thus shortening the length of the parts. Therefore, how to improve the corrosion resistance of steel pipes for motor vehicles through physical or chemical treatment in the process of making pipe fittings has become an urgent problem to be solved.

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