<正> 将铁基合金置于水蒸汽气氛中加热、保温,使其表面形成一层氧化性保护膜,这种工艺早已被作为一种改善耐大气腐蚀性能的手段。为使这一简单易行的工艺得以发展,使处理后的材料能适用于各种苛刻腐蚀环境,近年来作者进行了这方面的研究,提出了一种新型水蒸汽表面改性工艺,即在真空状态下进行水蒸汽气氛加热处理,并与化学预钝化相结合。本文讨论新工艺对不锈钢钝化特性的影响,并初步探讨其耐蚀机理。
The effect of chemical pre-passivation and subsequent vacuum steam treatment on passive characteristics of stainless steels has been studied. Vacuum steam treatment promotes the passive film formation of the steels,and this process can be further improved by chemical prepassivity.The passive film stability of the steel treated by the new technique is much higher than that of the steel treated by classical un- vacuum steam treatment technique,its stable time at passive potential is almost 50 times as that of 0Cr18Ni19Ti and its passive current density is at least one order lower than that of 0Cr18Ni19Ti the pitting corrosion resistance in Cl~- medium is also improved a lot as compared with that of its original state.X-ray surface analysis has been used to discuss the mechanism of improving corrosion resistance by the new technique.
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