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表征了打磨态和机械抛光态316LN不锈钢表面的粗糙度、表面残余应变和表面电子功函数的分布,并研究了打磨态和机械抛光态样品在硼酸盐溶液中电化学腐蚀行为的差异.与机械抛光态316LN不锈钢相比,打磨处理后样品表面较为粗糙,且表面的微观残余应变较大,近表面产生约50μm的加工硬化层.表面粗糙度和微观应变的增加引起打磨态表面电化学活性的增大,从而促进316LN不锈钢在硼酸盐溶液中腐蚀.机械抛光处理降低了表面钝化膜的载流子密度(供体和受体),并增大了钝化膜的阻抗,提高了钝化膜的致密性和保护性,能够有效抑制金属的进一步腐蚀.
The surface roughness, surface residual strain and surface electron work function distribution of 316LN stainless steel in polished and mechanically polished stainless steel were characterized, and the difference of electrochemical corrosion behavior between polished and mechanically polished samples in borate solution was also studied. Compared with the polished 316LN stainless steel, the surface of the polished sample is rough and the microscopic residual strain of the surface is larger, and the work-hardened layer of about 50μm is generated on the near surface.The increase of surface roughness and micro-strain leads to the electrochemical activity of polished surface , Which promotes the corrosion of 316LN stainless steel in borate solution.Physical polishing reduces the carrier density (donor and acceptor) of the surface passivation film and increases the impedance of the passivation film, increasing Passivation of the membrane of the tightness and protection, can effectively inhibit the further corrosion of metals.