利用等通道转角挤压(ECAP)方法,制备出平均晶粒尺寸为(130士30)nm的块体超细晶304L不锈钢.在0.05 mol/L H2SO4+0.25 mol/L Na2SO4溶液中测量了其极化曲线和钝化性能的Mott-Schottky曲线.结果表明,与粗晶合金相比,超细晶材料的自腐蚀电位更低,自腐蚀电流密度更大,更易发生活性溶解且溶解速度更快,但致钝电位更低,维钝电流密度更小,钝化区间更宽.表面钝化膜均具有n型半导体特征,超细晶粒有助于304L不锈钢表面形成更为稳定的钝化膜,载流子密度更小,载流子的扩散系数更低.
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