ZHANG Qinghua*,ZHANG Zhengxu,ZHAO Qi.Effect of Manganese Phosphating Treatment on Corrosion Resistance of Materials Used for Automotive Transmission Parts[J].Plating & Finishing,2020,(5):38-43.[doi:10.3969/j.issn.1001-3849.2020.05.0060]
锰系磷化处理对汽车传动件材料耐腐蚀性能的影响
- Title:
- Effect of Manganese Phosphating Treatment on Corrosion Resistance of Materials Used for Automotive Transmission Parts
- 文献标志码:
- A
- 摘要:
- 为了提高汽车传动件常用材料42CrMo钢的耐腐蚀性能，对42CrMo钢进行锰系磷化处理，并考察了表面调整和磷化液温度对磷化膜耐腐蚀性能的影响。结果表明，表面调整后形成的磷化膜结晶细致均匀，晶粒大小较均一，较未表面调整直接形成的磷化膜的耐腐蚀性能有一定的提高；磷化液温度对磷化膜的微观形貌、成分和耐腐蚀性能有较大影响，随着磷化液温度从78 ℃升高到94 ℃，晶粒先细化后粗化，磷化膜致密性先变好后变差；磷化膜中Mn元素质量分数先升高后降低，Fe元素质量分数先降低后升高，而P和O元素质量分数变化不大；磷化膜的腐蚀电位先正移后负移，腐蚀电流密度先降低后升高；表面调整后在86 ℃下形成的磷化膜具有良好的耐腐蚀性能，其腐蚀电位和腐蚀电流密度分别为-527.46 mV、1.997×10-5 A/cm2，对42CrMo钢的保护效率为73.2%，能有效提高42CrMo钢的耐腐蚀性能。
- Abstract:
- 42CrMo steel which was commonly used for automotive transmission parts was treated by manganese phosphating in order to improve its corrosion resistance. The influence of surface conditioning and phosphating solution temperature on the corrosion resistance of phosphating film was investigated. The results show that the phosphating film formed after surface conditioning has fine and even crystals, and the grain size is relatively uniform. Compared with the phosphating film directly formed without surface conditioning, the corrosion resistance of the phosphating film formed after surface conditioning is improved. The phosphating solution temperature has obvious influence on the micromorphology, composition and corrosion resistance of phosphating film. With the rise of phosphating solution temperature from 78 ℃ to 94 ℃, the grains were first refined and then coarsed, and the densification of phosphating film became better first and then worse. The mass fraction of Mn increased first and then decreased, the mass fraction of Fe decreased first and then increased, while the mass fraction of P and O did not change much. The corrosion potential of phosphating film moved forward and then moved negatively, and the corrosion current density first decreased and then increased. The optimal phosphating film formed at 86 ℃ after surface conditioning has excellent corrosion resistance, the corrosion potential and corrosion current density were -527.46 mV and 1.997×10-5 A/cm2, respectively. The protection efficiency of optimal phosphating film on 42CrMo steel was 73.2%, indicating that the optimal phosphating film can effectively improve the corrosion resistance of 42CrMo steel.
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备注/Memo
收稿日期： 2020-03-18；修回日期： 2020-04-06
通信作者： 张庆华， email： zhang_shu0208@126.com
基金项目： 甘肃省教育厅课题（2019B-274）