| LIU Yun-tang,LIU Yin-ting,WANG Sheng-min.Mechanical Galvanizing of 65Mn High Elastic Washer[J],46(9):235-239 |
| Mechanical Galvanizing of 65Mn High Elastic Washer |
| Received:April 04, 2017 Revised:September 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.09.037 |
| KeyWord:high elastic washer mechanical galvanizing mechanical plating 65Mn hydrogen embrittlement galvanizing |
| Author | Institution |
| LIU Yun-tang |
Guangdong Xingfa Aluminum Co., Ltd, Foshan , China |
| LIU Yin-ting |
Foshan Garon Intelligent Machinery Co., Ltd, Foshan , China |
| WANG Sheng-min |
Kunming University of Science and Technology, Kunming , China |
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| Abstract: |
| To solve the problem of hydrogen embrittlement of 65Mn high elastic washer. In this paper, Zinc coating was prepared on the surface of 65Mn high elastic washer by mechanical plating. The appearance/integrity, bonding strength and porosity of the coating were characterized by visual inspection, grid test and ferroxyl text respectively. The uniformity of the coating thickness was ana-lyzed by copper sulfate test. The effect of pH value of the plating solution on the hydrogen embrittlement of the plated washer was analyzed by means of pre-fastening test and the effect of passivation on corrosion resistance of the coating was investigated by neutral salt spray test. The surface of the prepared zinc coating is smooth, the cover is complete, and there are no defects such as peeling, leakage, and so on. The coating is light grayish tone, the thickness of the coating is uniform, and the coating has enough density. When the pH value of the plating solution is lower (1~2 and 2~3), the hydrogen embrittlement was caused in plating process. When the pH value of the plating solution is 3~4, no cracks or cracks has been found. The passivated mechanical plated zinc coating of high elastic washer shows good corrosion resistance after 96 h of NSS test. when the pH value of the plating solution could be set to 3~4, or the mechanically deposited washers could be natural aged at least for 1 to 2 weeks, using the method of mechanical plating can effectively eliminate hydrogen embrittlement of 65Mn high elastic pad plating process. Passivation treatment could delay or prevent the formation of white rust in the surface of mechanical zinc coating. |
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