CAJ | 학술논문

利用等通道转角挤压方法制备块体超细晶Fe-Ni-Cr合金，对其在0.25 mol/L Na2SO4+0.05 mol/L H2SO4溶液中的耐蚀性进行研究。与粗晶合金相比，超细晶合金表现出加速的活性溶解过程，钝化区间缩小，维钝电流密度更大。对表面钝化膜进行 Mott-Schottky 曲线测试并结合点缺陷模型分析，结果表明，超细晶合金钝化膜内载流子的扩散系数较粗晶合金显著提高一个数量级，载流子密度略有降低。
이용등통도전각제압방법제비괴체초세정Fe-Ni-Cr합금，대기재0.25 mol/L Na2SO4+0.05 mol/L H2SO4용액중적내식성진행연구。여조정합금상비，초세정합금표현출가속적활성용해과정，둔화구간축소，유둔전류밀도경대。대표면둔화막진행 Mott-Schottky 곡선측시병결합점결함모형분석，결과표명，초세정합금둔화막내재류자적확산계수교조정합금현저제고일개수량급，재류자밀도략유강저。
The corrosion behavior of bulk ultra-fine grained (UFG) Fe-Ni-Cr alloy prepared by equal-channel angular pressing technique was investigated in 0.25 mol/L Na2SO4+0.05 mol/L H2SO4 solution by electrochemical measurements. As compared to the coarse grained (CG) counterpart, the UFG alloy exhibits an acceleration of the active dissolution and a shrunk passive region with a higher passive current. The Mott-Schottky analysis in conjunction with the point defect model indicates that the donor diffusion coefficient in the passive films of the UFG sample increases greatly to one magnitude order higher and the donor density is slightly lower than that of the CG sample.