Chloride Induced Secondary Passive Film Failure for Laser Additive Manufacturing Nickel-Based Superalloys during Electrochemical Machining
Chloride Induced Secondary Passive Film Failure for Laser Additive Manufacturing Nickel-Based Superalloys during Electrochemical Machining
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DOI：
10.1149/1945-7111/acdafd
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Weidong Huang
中科院分区：
文献类型：
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作者：
Pengfei Guo;Xin Lin;Digby Macdonald;Inger Odnevall Wallinder;Shaoli Zhang;Yufeng Zhang;Changjian Lin;Qiang Wu;Yuan Yang;Weidong Huang
Abstract. We investigated the influence of chloride on the secondary passive film (SPF) on laser directed energy deposition Alloy 718 during electrochemical machining. The results show that SPF formed in chloride-containing electrolyte is more defective than that formed in chloride-free solution, due to the stepped-up cation ejection by chloride. Chloride accelerates the SPF failure via enhanced cation vacancy condensation, SPF dissolution and possibly via surface vacancy pairs’ coalescence, restraining the formation of CrO3 and inducing a better surface quality than does the chloride-free electrolyte. Based on the Point Defect Model, a mechanism describing the influence of chloride on SPF was developed.
