Pitting behavior and mechanism caused by Ca-Al-O-S composite inclusions in low-alloy steels
Abstract
Purpose
The purpose of this study is to study the pitting caused by Ca-Al-O-S composite inclusions of low-alloy steel in 3 Wt.% NaCl solution and 0.01M NaHSO3 solution.
Design/methodology/approach
The corrosion in 0.01M NaHSO3 was much weaker than in 3 Wt.% NaCl 3D display of the pitting formation and development process that has been calculated using scanning electron microscope (SEM) and laser scanning confocal microscopy (LSCM). In addition, a corrosion mechanism of pitting formation by galvanic interaction of composite inclusion and base metal has been proposed.
Findings
Results show that in immersion test, metal base around inclusions was dissolved due to corrosion. Corrosion on the metal base closer to inclusions was more severe.
Originality/value
A corrosion mechanism of pitting formation by galvanic interaction of composite inclusion and base metal has been proposed.
Keywords
Citation
Yi, F., Qingfeng, W. and Wenxiu, Y. (2017), "Pitting behavior and mechanism caused by Ca-Al-O-S composite inclusions in low-alloy steels", Anti-Corrosion Methods and Materials, Vol. 64 No. 2, pp. 218-224. https://doi.org/10.1108/ACMM-05-2016-1675
Publisher
:Emerald Publishing Limited
Copyright © 2017, Emerald Publishing Limited