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通过测定合金在含1NCl~-的不同pH值的水溶液中的阳极极化曲线,绘制了三个系列12种铁素体不锈钢(17Cr-xMo、25Cr-tMo、30Cr-xMo、其中x=0、2、4、6)的实验电位—pH图。合金中的Cr含量对点蚀超始过配的影响极为显著;Mo含量对点蚀击穿电位的影响则与含Cr量有密切的关系。添加少量的Mo就使低电位、低pH条件下的活化腐蚀区大大缩小,对局部腐蚀的发展过程起重要的阻滞作用;Cr对这种活化区的影响远不及Mo明显和意义重大。适当Cr和Mo的综合作用可产生对抵抗局部腐蚀的发生和发展均极为有效的高性能合金。
Three series of 12 ferritic stainless steels (17Cr-xMo, 25Cr-tMo, 30Cr-xMo, where x = 0, were prepared by determining the anodic polarization of the alloy in aqueous solutions containing 1NCl- 2,4,6) of the experimental potential-pH diagram. The effect of Cr content in the alloy on over pitting corrosion is extremely significant. The effect of Mo content on the breakdown pitting potential is closely related to the Cr content. The addition of a small amount of Mo makes the activated corrosion zone at low potential and low pH greatly reduced and plays an important role in the development of local corrosion. The effect of Cr on this activation zone is far less significant and significant than that of Mo. Appropriate combination of Cr and Mo can produce extremely effective high-performance alloys that are resistant to the occurrence and development of localized corrosion.