Method for directly generating black corrosion-resistant micro-arc oxidation film layer on steel surface

Abstract

The present invention relates to the steel surface intensified machining technique, and specifically refers to a method for directly generating a black corrosion-resistant micro-arc oxidation film layer on the steel surface. Firstly, the surface of a steel product is mechanically polished, and then is cleaned to remove oil and stains. After that, the steel product is placed in an electrolyte solution to serve as an anode for the micro-arc-oxidation treatment. In this way, the steel product with the black micro-arc oxidation film on the surface thereof is simply cleaned and dried. The method is characterized in that the electrolyte solution basically comprises the following components: 6-32 g / l of sodium aluminate, 2-96 g / l of sodium silicate, and 0.05-10 g / l of sodium dihydrogen phosphate. According to the technical scheme of the invention, a black oxide ceramic film is directly generated on the steel surface.

Description

technical field [0001] The invention relates to a steel surface strengthening treatment technology, in particular to a new preparation process of a ceramic coating on the surface of a steel material, in particular to a method for directly forming a black wear-resistant and corrosion-resistant micro-arc oxidation film on the steel surface. Background technique [0002] Due to its high strength, high toughness, easy processing, and low cost, steel materials have become the most widely used metal materials in industry, but they are prone to rust and wear; the selection of special high-quality corrosion-resistant and wear-resistant steel can effectively solve the problem of corrosion and wear. Wear problems, but often the development cycle is long; the surface strengthening treatment of steel materials, especially the surface ceramicization can effectively improve its wear resistance and corrosion resistance. [0003] Micro-arc oxidation technology, also known as plasma electrol...

AI Technical Summary

Problems solved by technology

[0002] Due to its high strength, high toughness, easy processing, and low cost, steel materials have become the most widely used metal materials in industry, but they are prone to rust and wear; the selection of special high-quality corrosion-resistant and wear-resistant steel can effectively solve the problem of corrosion and wear. wear problem, but the development cycle is often longer; surface strengthening treatment of steel materials, especially surface ceramicization can effectively improve its wear resistance and corrosion resistance

[0003] Micro-arc oxidation technology, also known as plasma electrolytic oxidation, as a surface treatment technology developed in recent years, has achieved great success in the modification of material surfaces, especially metal surfaces, and has become a hot spot in the field of material research, especially in the field of The so-called valve metals and their alloys have been applied in surface treatment, especially Al, Mg, Ti and their alloys, which have greatly improved the performance of the above metals; at the same time, due to the needs of applications, various colored ceramic films have also been developed. A hotspot of micro-arc oxidation technology for ceramic film formation with a certain color, among which, black has become the focus due to its wide adaptability, such as black micro-arc oxidation ceramic film of aluminum alloy; but the traditional black ceramic film electrolyte system Often contain toxic elements or environmentally harmful elements such as chromium, etc.

[0004] However, the application of micro-arc oxidation technology on the surface of steel materials has been ineffective. For a long time, the industry has always believed that this technology cannot be directly applied to the surface of steel materials. In the research on the material surface, there have been methods such as hot-dip aluminum plating on the surface of steel, thermal spraying aluminum, etc., and then performing micro-arc oxidation, but these indirect methods complicate the process; some studies such as Chinese patent CN1737211A have proposed a specific The method of micro-arc oxidation on the surface of stainless steel, and this method is directly used in the manufacture of stainless steel non-stick pans (see Chinese patent CN1919118A), which improves the protective performance and application fields of stainless steel; Chinese patent CN1721578A proposes ordinary carbon under alkaline conditions Steel micro-arc oxidation method, the electrolyte system includes phosphate, carbonate, sulfate or silicate system, etc.

[0005] At present, there is no special report on the research and discussion on the color of micro-arc oxidation ceramic film on steel surface. This is because the direct micro-arc oxidation process on steel surface is difficult, and on the other hand, it is due to the environment-friendly black micro-arc oxidation film and The realization of its electrolyte formula and process is also relatively difficult. Therefore, it has not been reported to directly generate a black, wear-resistant and corrosion-resistant ceramic film.

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