316L不锈钢表面激光熔覆钴基合金组织及锌蚀机理

发布时间：2018-06-27 16:40

  本文选题：激光熔覆 + 钴基合金　； 参考：《焊接学报》2015年01期

【摘要】：采用半导体激光器在316L不锈钢表面制备钴基合金熔覆层,对激光熔覆层的组织形貌、成分、结构及锌蚀机理进行了系统研究.结果表明,选择优化的激光辐照工艺参数,获得的钴基合金熔覆层表面平整、无裂纹、与基材呈良好的冶金结合.钴基合金熔覆层主要由γ-Co,M23C6及耐腐蚀性能优异的Laves相Co3Mo2Si和少量硬质耐磨相Co6W6C组成.在460℃熔融锌中腐蚀试验表明,钴基合金熔覆层的锌蚀机理为选择性腐蚀,熔覆层表层出现一层亮白色腐蚀过渡层,在过渡层内钴基固溶体基体优先发生腐蚀,导致Laves相剥落,从而形成了锌液对钴基合金熔覆层的进一步腐蚀.
[Abstract]:Co-base alloy cladding layer was prepared by semiconductor laser on 316L stainless steel. The microstructure, composition, structure and zinc corrosion mechanism of laser cladding layer were studied systematically. The results show that the surface of cobalt-based alloy cladding layer is flat, no crack and good metallurgical bonding with the substrate by selecting the optimized laser irradiation process parameters. Co-based alloy cladding is mainly composed of 纬 -CoM23C6, Laves phase Co _ 3Mo _ 2Si with excellent corrosion resistance and a small amount of hard wear resistant phase Co _ 6W _ 6C. The corrosion test in molten zinc at 460 鈩，

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