Iron group metal material after black surface treatment and manufacturing method thereof

Abstract

The present invention provides an iron group metal material after black surface treatment, which forms a black film that has excellent corrosion resistance and sliding performance and does not contain chromium. The surface of the iron group metal material is provided with the following components: a ferroferric oxide layer which is formed through chemical conversion treatment; a chemical conversion treatment layer which is formed on the ferroferric oxide layer and comprises at least one component selected from the following matters: phosphate of at least one element selected from zinc, tin, iron, manganese and calcium; oxide of at least one element selected from titanium, zirconium, hafnium, indium, tin, bismuth, vanadium, nickel, cerium, molybdenum and wolfram; fluoride of at least one element selected from titanium, zirconium, hafnium, indium, tin, bismuth, vanadium, nickel, cerium, molybdenum and wolfram; and a solid lubrication layer which is formed on the chemical conversion treatment layer.

Description

technical field [0001] The present invention relates to an iron-based metal material with a black surface treatment and a manufacturing method thereof. Chromium-containing black film (film). Background technique [0002] In optical mechanical parts, measuring equipment parts, firearms, telecommunications equipment parts, motorcycle mechanical parts, automotive mechanical parts, decorations, etc., as well as mechanical devices represented by semiconductor manufacturing equipment and food manufacturing equipment For direct linkages and the like, iron-based metal materials are used. For the purpose of improving corrosion resistance and sliding performance, various surface treatments are performed on these iron-based metal materials. For applications that also require reduction of light reflectance and design performance, it is necessary to make the surface of the iron-based metal material black . [0003] As a technique for making the surface of such an iron-based metal mate...

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Problems solved by technology

[0008] However, the method of Patent Document 1 uses hexavalent chromium, which causes inflammation in digestive organs and lungs, and is carcinogenic, teratogenic, toxic, etc., which poses problems in terms of work safety and the environment.

In addition, the chrome-plated product obtained by the method of Patent Document 1 cannot be said to have satisfactory performance in terms of sliding performance.

[0009] Although the method of Patent Document 2 does not use hexavalent chromium, since trivalent chromium is contained in the formed film, it cannot be said to be completely chromium-free, and there are still problems in terms of work safety and the environment.

In addition, the chrome-plated product obtained by the method of Patent Document 2 cannot be said to have satisfactory performance in terms of sliding performance.

[0010] The method of Patent Document 3 requires a large-scale facility for performing electrolysis after zinc-nickel plating, so there is an economical problem due to high cost

[0011] The method of Patent Document 4 is the same as Patent Document 3, requiring large-scale equipment for performing electrolysis, and the obtained product cannot be said to have sufficient performance in terms of corrosion resistance

[0012] In addition, since the レイデント (registered trademark) treatment contains chromium in the formed film, it cannot be said to be completely chromium-free, and there are still problems in terms of work safety and the environment.

In addition, because Reidento (registered trademark) treatment is usually electrolyzed at an extremely low temperature below 10°C, there are also economical problems due to power costs, waste liquid treatment costs, etc.

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