多因素综合海洋气候模拟加速试验技术在紧固件表面处理工艺筛选中的应用

目的进行表面处理工艺筛选。方法采用海洋气候多因素综合模拟加速试验技术,对镀锌三价铬钝化、镀锌六价铬钝化、镀锌镍合金、无铬锌铝涂层、拉孚铼工艺和石墨烯涂层6种汽车紧固件表面处理工艺进行试验。测定保护层初期腐蚀、保护层腐蚀10%(面积)和基体金属腐蚀10%(面积)的时间,根据检测数据评价上述工艺的保护性能并进行优劣排序。与万宁站户外暴露试验结果对比分析,验证筛选结果的正确性,同时评价海洋气候多因素综合模拟加速试验技术的加速性和相关性。结果 6种表面处理工艺出现保护层初期腐蚀的时间分别为24、48、48、48、144、72 h;保护层腐蚀10%(面积)的时间分别为48、72、72、72、216、144 h;基体金属腐蚀的时间分别为216、168、432、432、432、216 h。腐蚀外观形貌变化过程与户外暴露试验相似,平均加速倍率为21。结论上述工艺保护性能优劣排序为拉孚铼工艺、无铬锌铝涂层、锌镍合金镀层、石墨烯、镀锌三价铬钝化和镀锌六价铬钝化。海洋气候多因素综合模拟加速试验技术与户外暴露试验结果相比具有高加速性和良好相关性,筛选结果正确。

Application of Multi-factor Integrated Simulation of Marine Climate and Acceleration Test Technologies in Screening of Fastener Surface Treatment Technologies

Objective To screen surface treatment technologies. Methods Six kinds of automobile fastener surface treatment technologies, trivalence chromium passivated zinc plating, hexad chromium passivated zinc plating, zinc-nickel alloys plating, chromium free zinc aluminum plating, LAFRE? , and Graphene coating, were tested using a new technology—multi-factor simula-tion of marine climate and acceleration test technology. Initial corrosion time, the time of 10% surface treatment area corrosion, and the time of 10% base metal area corrosion were measured with net eye inspection method. The protection ability of the above surface treatment technologies was evaluated with inspection data. The correctness of the screening result, the acceleration and rel-ativity of the new technology were validated through comparison and analysis with outdoor exposure test results of Wanning exposure site. Results The initial corrosion time of the above surface treatment technologies was 24, 48, 48, 48, 144 and 72 hours respec-tively;the time of 10% surface treatment area corrosion was 48, 72, 72, 72, 216 and 144 hours respectively; the time of 10%base metal corrosion area was 216, 168, 432, 432, 216 and 216 hours respectively. The surface morphology changing process was similar with outdoor exposure and the average acceleration ratio was 21. Conclusion The rank by the protection ability of the above surface treatment technologies is LAFRE? technology, chromium free zinc aluminum plating, zinc-nickel alloy plating, Graphene coating, trivalence chromium passivated zinc plating, and hexad chromium passivated zinc plating. The screening is correct. The multi-factor integrated simulation of marine climate and acceleration test technologies have high acceleration and good correlativity with outdoor exposure.