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Novel composite blackening process

A technology of blackening treatment and new process, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problem of poor blackening quality, red and mottled parts, and materials that cannot be blackened Handling and other problems, to achieve the effect of beautiful color, durability and applicability, and slight deformation

Inactive Publication Date: 2014-02-19
上海朋泰机械科技有限公司
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Problems solved by technology

However, this method has the following defects: (1) some materials cannot be blackened, such as ductile iron, etc.; (2) the blackening quality of some materials is not good, such as parts appear red and mottled; (3) Parts after pickling are prone to hydrogen embrittlement Fe+H 2 SO 4 →FeSO 4 +H 2 ↑

Method used

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Examples

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with specific embodiments. It should be understood that the following examples are only used to illustrate the present invention but not to limit the scope of the present invention.

[0018] The nitriding salt and oxidizing salt used in the following examples were purchased from Shandong Anqiu Jiuxing Heat Treatment Material Co., Ltd., and the main component of the nitriding salt is Li 2 CO 3 、Na 2 CO 3 、K 2 CO 3 , (NH 2 ) 2 CO and trace K 2 S, the main component of the oxide salt is NaOH. The nitriding cleaning solution was purchased from Shanghai Puzha Material Company.

[0019] The new composite blackening process of the present invention comprises the following steps: first cleaning→preheating→short-time nitriding→oxidation blackening→second cleaning→oil immersion. Preheat the parts to be treated at 365-375°C for 18-22 minutes after being cleaned with nitriding cleaning solution. Then pl...

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Abstract

The invention discloses a novel composite blackening process. The novel composite blackening process comprises the steps of short-time nitriding and oxidation blackening. According to the novel process of combining the short-time nitriding and the oxidation blackening, a Fe3N-Fe3O4 two-phase layer can be formed on the surface of a part. The novel composite blackening process has the advantages of corrosion resistance, abrasion resistance, attractive color, durability and wide application.

Description

technical field [0001] The invention belongs to the technical field of metal surface chemical treatment, and in particular relates to a new process of compound blackening treatment. Background technique [0002] The main process of ordinary blackening technology is: oil removal → pickling → blackening → saponification → oil immersion. The main chemical raw materials used are NaOH, NaNO 2 and Na 3 PO 4 , and these three chemical raw materials are used to generate Fe on the surface of the part at 145°C 3 o 4 The passivation film makes it beautiful and anti-corrosion. However, this method has the following defects: (1) some materials cannot be blackened, such as ductile iron, etc.; (2) the blackening quality of some materials is not good, such as parts appear red and mottled; (3) Parts after pickling are prone to hydrogen embrittlement Fe+H 2 SO 4 →FeSO 4 +H 2 ↑. Therefore, it is necessary to improve the existing blackening technology to overcome the above-mentioned ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/58C23C8/50
Inventor 潘诗良
Owner 上海朋泰机械科技有限公司
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