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Metal surface treatment method

A metal surface treatment and metal surface technology, applied in the field of anti-corrosion passivation treatment, can solve the problems of pitting corrosion and secondary rust of the passivation film, unsatisfactory corrosion resistance of the passivation film, etc., to save drugs and prevent deposition. , The effect of preventing secondary rust

Inactive Publication Date: 2018-05-04
SAE TECH DELEVOPMENT DONGGUAN
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

Among them, hydrogen peroxide belongs to the emerging green environmental protection passivation agent and is being widely used, but in actual implementation, the passivation film on the metal surface is prone to pitting corrosion and secondary rust, therefore, the corrosion resistance of the passivation film is not ideal

Method used

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Examples

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Embodiment Construction

[0012] The metal surface treatment method of the present invention will be further described below in conjunction with the examples, but the present invention is not limited thereto.

[0013] The passivation solution adopted in the passivation process in the metal surface treatment method of the present invention includes hydrogen peroxide with a mass fraction of 0.8% to 1.7%, triethanolamine with a volume fraction of 0.08% to 0.13%, and a mass concentration of 1.5g / L ~2.5g / L of trisodium phosphate.

[0014] Preferably, the passivation step further includes controlling the pH value of the passivation solution to 10-10.2, the passivation temperature to 40-50 degrees, and the passivation time to 3-5 hours.

[0015] The following are several preferred passivation solution ratios and passivation process control.

[0016] For example, a passivation solution containing 0.8% hydrogen peroxide by mass fraction, 0.1% triethanolamine by volume fraction, and trisodium phosphate with a m...

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Abstract

The invention provides a metal surface treatment method. The metal surface treatment method comprises the following passivation step that a passivation solution is used for conducting passivation on the surface of metal, wherein the passivation solution contains hydrogen peroxide with the mass fraction of 0.8%-1.7%, triethanolamine with the volume fraction of 0.08%-0.13% and trisodium phosphate with the mass concentration of 1.5-2.5 g / L. By the adoption of the metal surface treatment method, a dense passivation film can be formed on the surface of the metal, so that corrosion resistance and rust resistance are achieved, and the service life of the metal is prolonged.

Description

technical field [0001] The invention relates to metal surface treatment technology, in particular to anti-corrosion passivation treatment after metal cleaning. Background technique [0002] A smooth metal surface usually requires a thin protective film to resist corrosion and rust. This protective film is called a passivation film. Traditionally, passivation solutions that can form passivation films for metals generally include sodium nitrite, hydrazine, polyphosphate, hydrogen peroxide, etc. Among them, hydrogen peroxide is an emerging green passivating agent and is being widely used. However, in actual implementation, the passivation film on the metal surface is prone to pitting corrosion and secondary rust. Therefore, the corrosion resistance of the passivation film is not ideal. [0003] Therefore, there is an urgent need for an improved metal surface treatment method to overcome the above-mentioned defects. Contents of the invention [0004] The object of the presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/60
CPCC23C22/60
Inventor 龙命潮
Owner SAE TECH DELEVOPMENT DONGGUAN
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