Pitting corrosion of Ni-Cr-Fe alloys at open circuit potential in chloride plus thiosulfate solutions

被引：18
|
作者：
Araneda, Abraham A. Becerra [1 ,2 ]
Kappes, Mariano A. [1 ,2 ,3 ]
Rodriguez, Martin A. [1 ,2 ,3 ]
Carranza, Ricardo M. [1 ,2 ]
机构：
[1] UNSAM, Inst Sabato, CNEA, Ave Gral Paz 1499,B1650KNA, San Martin, Buenos Aires, Argentina
[2] Natl Commiss Atom Energy Argentina, Ave Gral Paz 1499,B1650KNA, San Martin, Buenos Aires, Argentina
[3] Natl Sci & Tech Res Council, Godoy Cruz 2290,C1425FQB, Buenos Aires, DF, Argentina
来源：
CORROSION SCIENCE | 2022年 / 198卷
关键词：
A; alloy; nickel; B; EIS; polarization; C; passive films; pitting corrosion; AUSTENITIC STAINLESS-STEEL; PASSIVE FILM; LOCALIZED CORROSION; DISSIMILAR WELDS; TEMPERATURE; RESISTANCE; BEHAVIOR; CHROMIUM; CRACKING; SULFATE;
D O I：
10.1016/j.corsci.2022.110121
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Alloys 600 and 800 exhibited stable pitting corrosion in 1 M NaCl plus thiosulfate deaerated solutions at the open circuit potential (OCP) and room temperature. Alloy 690 exhibited only metastable pitting. Stable pitting, stable passivity or metastable pitting were identified by observing features in the OCP vs. time transients and by analysis of electrochemical impedance spectroscopy measurements. Post-mortem scanning electron and optical microscopy observations confirmed these findings. Stable pits nucleated adjacent to Ti-rich inclusions, and reached diameters above 100 mu m after 50 h of OCP immersion. A prepassivation treatment inhibited this mechanism of pitting corrosion.
引用
收藏
页数：15
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