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Steel piece blackening method

A technology for steel parts and steel, applied in the field of material surface treatment, can solve the problems of uncoordinated consideration and inability to take into account the corrosion resistance of blackened film, and achieve the effects of ensuring adhesion, reducing poor blackening, and controlling the production process.

Pending Publication Date: 2021-04-06
东莞市慧泽凌化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the two-step treatment, the adhesion problem of the blackening film has been greatly improved. However, most of the pre-treatment and blackening treatment are not coordinated. The subsequent blackening treatment is only for the blackening film with color correction, and the blackening film Corrosion resistance can not be balanced

Method used

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  • Steel piece blackening method

Examples

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Effect test

Embodiment 1

[0028] A method for blackening steel parts, comprising the following steps:

[0029]1) Carry out pre-treatment on the steel parts to expose the clean and active surface of the steel parts;

[0030] a) Degreasing: Put the steel parts to be treated in a commercially available steel degreasing agent (CW-6008 produced by Dongguan Huizeling Chemical Technology Co., Ltd.) for ultrasonic cleaning for 5 minutes, set the temperature to 60°C, and wash them with water after degreasing ;

[0031] b) Activation or derusting: soak the degreasing steel parts in 30% hydrochloric acid aqueous solution for 3 minutes, set the temperature to normal temperature, and rinse with water after activation;

[0032] 2) Soak the steel parts after pretreatment in the pretreatment potion for 1 minute, set the temperature to normal temperature, and wash them with water after pretreatment; wherein, the pretreatment potion consists of 2g / l phosphoric acid, 5g / l dihydrogen phosphate Zinc, 1g / l titanate coupli...

Embodiment 2

[0036] The difference with embodiment 1 is:

[0037] In this embodiment, the pretreatment potion is adjusted to 2g / l of phosphoric acid, 5g / l of manganese dihydrogen phosphate, 1g / l of γ-(2,3-epoxypropoxy)propyltrimethoxysilane coupling agent, It is prepared by dissolving 1g / l dodecylamine polyoxyethylene ether and 1g / l sodium fluoride in pure water.

[0038] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0040] The difference with embodiment 1 is:

[0041] In this embodiment, the blackening potion is adjusted to 3g / l copper sulfate, 3g / l ammonium molybdate, 3g / l dithiodiacetic acid, 1g / l benzoic acid and 1g / l zirconate coupling Prepared by dissolving in water.

[0042] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of material surface treatment, and particularly relates to a steel piece blackening method. The steel piece blackening method comprises the following steps of (1) pretreating a steel piece to expose a clean and active surface of the steel piece; (2) soaking the pretreated steel piece in a preliminary treatment solution to finish preliminary treatment; (3) soaking the steel piece completing preliminary treatment in a blackening solution to finish blackening treatment; (4) putting the blackened steel piece product into hot water for hot washing, then soaking the blackened steel piece product in dehydrating anti-rust oil, and finally drying the blackened steel piece product by cold air; wherein the preliminary treatment solution comprises phosphoric acid or phosphate, a coupling agent, an amine surfactant and a film forming accelerator, and the blackening solution comprises main salt, a complexing agent, a blackening agent, a pH value stabilizer and a coupling agent. Compared with the prior art, the steel piece blackening method can ensure that the formed blackening film has good adhesive force and corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of material surface treatment, and in particular relates to a method for blackening steel parts. Background technique [0002] Steel structural products have become an indispensable raw material for the rapid development of today's society, and the steel blackening process is one of the most important surface treatment processes for steel parts. The traditional steel blackening process uses strong alkali and nitrate or nitrite at 130 Blackening at ~150°C for 30 to 50 minutes has many disadvantages such as long processing time, high energy consumption, and low efficiency, which have been criticized by practitioners. With the development of science and technology, in the past ten years, many normal temperature iron and steel blackening agents have emerged on the market. If the film is not well controlled, there will be disadvantages such as poor adhesion and poor corrosion resistance. Therefore, how to make ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/78C23C22/80C23C22/07C23C22/36C23C22/42C23C22/40C23C22/50
CPCC23C22/78C23C22/80C23C22/07C23C22/364C23C22/42C23C22/40C23C22/50
Inventor 金磊张兵
Owner 东莞市慧泽凌化工科技有限公司
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