Effects of deoxidizing degree on the pitting corrosion behavior of carbon and manganese steels |
| |
Authors: | Guo-liang Cao Guo-min Li Shan Chen Wan-shun Chang Xue-qun Chen |
| |
Institution: | (1) CANMET Materials Technology Laboratory—Natural Resources Canada, 568 Booth St., Ottawa, ON, K1A OG1, Canada |
| |
Abstract: | Nine steels with different deoxidizing degrees and two comparative steels were selected. Their pitting initiation susceptibility
was compared by means of potentiodynamic polarization tests in 3wt% NaCl solution. The pit propagation rate was evaluated
in artificial sea water and 3wt% sea salt solution by simulating occluded corrosion cell (SOCC) test and hanging plate test,
respectively. The composition of inclusions and corrosive feature were studied by scanning electron microscopy (SEM), electron
probe micro-analysis (EPMA), and optical microscopy (OM). The results indicate that sulfide inclusions in steel are the sites
for pit nucleation. The sulphide inclusions vary in shape from short spindle-like to long strip-like with increasing deoxidizing
degree. Under the same conditions, the lower the deoxidizing degree gets, the lower the pitting initiation susceptibility
becomes, and the stronger the resistance to pit propagation exhibits. For steels with different deoxidizing degrees, their
pitting initiation susceptibility is mainly influenced by thermodynamic stability, while the pit propagation rate is primarily
subject to the characteristics of inclusions in steel. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
| 点击此处可从《矿物冶金与材料学报》浏览原始摘要信息 |
| 点击此处可从《矿物冶金与材料学报》下载免费的PDF全文 |
|