| CHEN Yue-hua,JIANG De-feng,LIU Yong-yong,YUAN Li-hua.Improvement of Anti-spray-salt Corrosion Mechanism of Metal Shells[J],44(6):93-97,132 |
| Improvement of Anti-spray-salt Corrosion Mechanism of Metal Shells |
| Received:March 22, 2015 Revised:June 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.06.018 |
| KeyWord:shell high temperature sealing anti-spray-salt corrosion Ni-Au plating electroplating process coating |
| Author | Institution |
| CHEN Yue-hua |
Chongqing Optoelectronics Research Institute, Chongqing , China |
| JIANG De-feng |
Chongqing Optoelectronics Research Institute, Chongqing , China |
| LIU Yong-yong |
Chongqing Optoelectronics Research Institute, Chongqing , China |
| YUAN Li-hua |
Chongqing Optoelectronics Research Institute, Chongqing , China |
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| Abstract: |
| Objective To solve the problems of surface rust appearing on the gilded metal shell in Nacl salt solution and root breakage of the shell wires, and to improve the ability of anti-48 h salt spray corrosion of the shells, so as to figure out the problem of poor corrosion resistance of the coating. Methods According to the mechanism of salt spray corrosion, the morphology of gilded shells in the salt spray corrosion was observed with SEM. Then, the corrosion morphology of the coatings and sealing morphology of metal base (Kovar)-glass insulators (electric-vacuum glass)-metal lead (Kovar) were analyzed. By controlling the potential difference between the metal coating density, reducing the coating porosity, controlling the sealing temperature of the carton, inhibiting the crevice corrosion and controlling the coating thickness of the metal surface, thus the formation of the corrosion channel between the coating and the substrate can be prevented. Results The corrosion shapes of the gilded shells mainly present as pitting and crevice corrosion. Large area of pitting corrosion can be avoided on the metal surface by optimizing the process such as nickel and gold plating; and the crevice corrosion on the metal shells can be inhibited by optimizing the annealing temperature and the sealing temperature to be 800 ℃ and 900 ℃, respectively. Conclusion By optimizing the annealing temperature, sealing temperature, nickel plating, metal plating and other process, the ability of anti-48 h salt spray corrosion of the metal gilded shells can be effectively improved. |
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