过钝化
- transpassivation
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不锈钢过钝化和后处理研究
On the transpassivation and posttreatment of stainless steel
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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 .
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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 .
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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 .
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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 .