中文摘要：

运用氧化-浸泡循环实验和氧化-浸泡-蒸发循环实验,结合电化学测试以及SEM和XRD分析,研究了蒸汽环境对消声器用439不锈钢腐蚀行为的影响。结果表明：有/无蒸汽作用条件下,试样表面形成的腐蚀产物相似,循环实验后试样表面均生成了较浅的点蚀坑。与冷凝液环境相比,试样在蒸汽环境中的腐蚀阻力较小、局部腐蚀坑更深。蒸汽环境更有利于试样表面产物膜和蚀坑的生长。

英文摘要：

The influence of steam on the corrosion behavior of 439 stainless steel for automotive mufflers was studied by means of cyclic hot air oxidation-immersion in condensate test and cyclic hot air oxidation-immersion in condensate-exposure to steam test as well as electrochemical measurements, SEM, XRD and pitting depth analyses. The results show that all the specimens, after cyclic hot air oxidation-immersion in condensate test and then with and without subsequent exposure to steam test, suffered from pitting corrosion with similar corrosion products. However, the specimens show lower corrosion resistance and deeper corrosion pits when they had experienced the exposure to steam test rather than those only experienced the cyclic hot air oxidation- immersion in condensate test. The exposure to steam may facilitate the growth of corrosion products and pits.