过钝化

不锈钢过钝化和后处理研究

On the transpassivation and posttreatment of stainless steel

与硝酸钝化膜和自然钝化膜中元素的剖面分布相比，过钝化阳极氧化膜的富Cr区要比后二种膜宽得多，膜中Cr的氧化程度也比较完全。

The middle layer in the transpassive anodic oxide film which is rich in Cr is more wider and oxidized more complete than that in HNO_3 oxide film .

Mo能控制铁的氧化物相，降低Cr的过钝化溶解速率以及抑制Cl-向膜穿透，起着延长应力腐蚀孕育期的作用。

Mo in 316 alloy affected the composition and growth rate of iron oxides , decreased the dissolution rate of Cr at transpassive region and inhibited Cl ~ - in its penetration through the oxide film , playing therefore a role to prolong the incubation period of SCC .

结果表明：有、无磁场下铁在含Cl~-的Na2SO4溶液中的阳极极化曲线都呈现活化-钝化-过钝化特征，虽然Cl~-会阻碍钝化膜的形成过程；

It was shown that iron in Na2SO4 + Cl-solution exhibited active - passive-transpassive characteristics in the presence or absence of magnetic field , although Cl - in the solution would hinder the formation of passive layer .

在过钝化区形成的钝化膜，其耐蚀性比较好。

The corrosion resistance of the passive film formed in transpassive region is better than that in passive region .