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Clean production technology for low-temp oxidization

A clean production, low-temperature technology, applied in the direction of metal material coating process, etc., can solve the problems of film layer corrosion resistance, poor corrosion resistance, insufficient solution stability, strict requirements for workpiece pretreatment, etc., to achieve stable oxidation solution and easy Effects of maintenance management and clean production on environmental pollution

Inactive Publication Date: 2003-01-15
NANCHANG AERONAUTICAL ENG INST
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Problems solved by technology

However, the current low-temperature oxidation process still has many unsatisfactory points, such as strict pre-treatment requirements for workpieces; insufficient solution stability; poor corrosion resistance and corrosion resistance of the film layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006] First prepare the low temperature oxidizing solution, the best formula is: C u SO 4 4g / l, H 2 S e o 3 3g / l, Z n (H 2 PO 4 ) 2 3g / l, complexing agent 4g / l, N i Cl 2 0.4g / l; then operate according to the technological process: (1), chemical degreasing: degreasing is the key, if the oil is not completely removed, it will directly affect the quality of the film, use a low temperature degreasing agent, soak the workpiece at room temperature for 5- 10 minutes; (2) flowing cold water washing: rinse with tap water to make the workpiece free of oil; (3) pickling: pickle with 15% hydrochloric acid solution to make the workpiece reveal metallic luster; (4) low temperature oxidation: add the prepared Oxidation solution, use phosphoric acid to adjust the pH within 2.5-3.0, immerse the workpiece in the oxidation solution for 7 minutes, and keep shaking to make it evenly colored, after the workpiece is taken out, stay in the air for 1 minute, so as to continue the film-for...

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PUM

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Abstract

A clean low-temp oxidizing process is disclosed. Its oxidizing liquid contains CuSO4 (2-5 g / L), H2SeO3 (4-7), Zn (H2PO4) (2.5-3.5), complexing agent (3-4.5) and NiCl2 (0.4-0.6). Its technological steps include removing oil, washing with cold water, acid and cold water sequentially, low-temp oxidizing, washing with cold water, drying and immersing in oil. Its advantages are low energy consumption and cost, high speed (less than 10 min) and less environmental pollution.

Description

[technical field] [0001] The invention relates to a clean iron and steel oxidation production process, in particular to a low-temperature oxidation process for iron and steel. [Background technique] [0002] The wide application of steel materials makes it an important pillar to maintain people's life and production in various fields of national economy. However, the corrosion problem has plagued the development of materials for a long time. After a lot of scientific research, people invented the surface oxidation treatment of steel. The traditional oxidation technology is mainly alkaline oxidation process, which uses alkaline sodium nitrite high-temperature oxidation system. Large, polluting the environment and affecting the health of workers, people are looking for a process that can replace it. Low temperature oxidation is a promising process. Compared with alkaline high temperature oxidation, low temperature oxidation has high efficiency, energy saving, simple equipment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/50
Inventor 魏立安杨晓燕魏洽刘炳根曹慧兰
Owner NANCHANG AERONAUTICAL ENG INST
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