Detection of Stress Corrosion Cracking of Type 304 Stainless Steel Using Acoustic Emission and Corrosion Potential Fluctuation
Detection of Stress Corrosion Cracking of Type 304 Stainless Steel Using Acoustic Emission and Corrosion Potential Fluctuation
复制标题
利用声发射和腐蚀电位脉动检测 304 型不锈钢的应力腐蚀裂纹
DOI：
10.4028/www.scientific.net/amr.13-14.243
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
M. Takemoto
中科院分区：
文献类型：
--
作者：
A. Yonezu;Hideo Cho;M. Takemoto
本文根据声发射和腐蚀电位波动（CPF）同步监测数据，探讨了敏化和非敏化304不锈钢的氯化物应力腐蚀开裂机理。在质量分数为35%的MgCl2溶液中，钢通过充满腐蚀产物（氢氧化铬）的腐蚀坑产生穿晶SCC。点蚀和穿晶应力腐蚀均不产生阳极溶解引起的主要不良事件，而产生快速下降（RD）型CPF。然而，我们检测到的二次AE从氢气的演变和腐蚀产物的断裂。发现氢气产生的声发射具有单一频率成分，而腐蚀产物的断裂产生的声发射具有较宽的频率成分。敏化钢由于晶粒的脱落产生了一次AE，同时也产生了二次AE。SCC的显微镜下进展通过AE和CPF的时间和时滞进行一致解释。
This paper discusses the mechanism of chloride SCC of sensitized and non-sensitized Type-304 stainless steel based on the data obtained by simultaneous monitoring of AE and corrosion potential fluctuation (CPF). The steel produced transgranular SCC via corrosion pits filled with corrosion product (chromium oxy-hydroxides) in 35 mass % MgCl2 solution. Both the pitting corrosion and transgranular SCC did not produce primary AEs due to anodic dissolution, while they generated rapid drop (RD) type CPF. We, however, detected the secondary AEs from hydrogen gas evolution and fracture of corrosion products. Hydrogen gas was found to produce AE with single frequency component, while the fracture of corrosion products produced AEs with broad frequency components. The sensitized steel produced primary AEs due to the falling-off of grains as well as the secondary AEs. Microscopic progression of SCC was consistently interpreted by the timing and time-lag of AEs and CPFs.