Si含量对35CrMo热浸镀Al-Si镀层性能影响研究

Study on the effect of Si content on the properties of 35CrMo hot dipped Al-Si coating

为了降低抽油杆35CrMo因腐蚀带来的巨大安全隐患和经济损失,本文采用热浸镀Al-Si工艺提高其耐蚀性能。通过查阅资料与前期试验,确定了覆盖剂和助镀剂,再对镀层进行微观组织分析和厚度测定,从而研究Si含量对镀层组织结构的影响。在浸镀温度650℃,浸镀时间14min时,Si含量为8%时是最优的,此时合金层生长均匀,镀层厚度最佳。研究结果既可以指导优化镀铝工艺及镀层的组织与性能,又可以为进一步探讨Si在镀层中的作用提供帮助,,从而有效地增加抽油杆35CrMo的耐腐蚀性。

In order to reduce the great safety hazard and economic loss caused by corrosion of 35 CrMo oil rod, the corrosion resistance of the rod was improved by hot dip plating process. The influence of Si content on the microstructure of the coating was studied by means of microscopic analysis and thickness measurement. At 650 ℃ and 14 min immersion time, Si content of 8 % is optimal. The alloy layer grows evenly and the coating thickness is optimal The results can not only guide the optimum aluminizing process and the structure and properties of the coating, but also help to explore the role of Si in the coating, thus increasing the corrosion resistance of 35 CrMo.