Morphological estimation of pitting corrosion on vertically positioned 304 stainless steel using acoustic-emission duration parameter

被引:43
|
作者
Wu, Kaige [1 ,2 ,3 ,4 ]
Byeon, Jai-Won [1 ]
机构
[1] Seoul Natl Univ Sci & Technol, Dept Mat Sci & Engn, Seoul 139743, South Korea
[2] Univ Tokyo, Dept Mat Engn, Tokyo 1138656, Japan
[3] Seoul Natl Univ Sci & Technol, Seoul, South Korea
[4] Univ Tokyo, Dept Mat Engn, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan
关键词
Stainless steel; Polarization; SEM; Pitting corrosion; Acoustic emission; STAINLESS-STEEL; CRACK INITIATION; PITS; GROWTH;
D O I
10.1016/j.corsci.2018.12.031
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A morphological estimation of the pitting corrosion of type 304 stainless steel using the acoustic emission (AE) duration parameter is proposed in the present work. The pit morphology depending on Cl- concentration and gravity was investigated. Occluded pits in low-concentration NaCl solution were observed to develop with more long-duration AEs, while elongated pits with ruptured cover in high-concentration NaCl solution were predominantly concurrent with short-duration AEs. The morphological descriptor "eta" derived from the AE duration amplitude plots reflected the morphological transition from occluded to elongated open pits. An AE-based correspondence among the environmental factors and corrosion morphologies was proposed.
引用
收藏
页码:331 / 337
页数:7
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