Development of an In Situ Micro-Corrosion Cell for the Investigation of Pitting Corrosion on Austenitic and Ferritic Stainless Steels

被引：1

作者：

Kiremit, Sinan ^{[1
,2
]}

Cremer, Julian ^{[3
]}

Stallmeier, Yannic ^{[1
]}

Sonntag, Adrian ^{[1
]}

Kloecker, Michaela ^{[1
]}

Anselmetti, Dario ^{[3
]}

Huetten, Andreas ^{[2
]}

Kordisch, Thomas ^{[1
]}

机构：

[1] Bielefeld Univ Appl Sci, Bielefeld Inst Appl Mat Res, Fac Engn & Math, Interakt 1, D-33619 Bielefeld, Germany

[2] Bielefeld Univ, Fac Phys, Thin Films & Phys Nanostruct, Univ Str 25, D-33615 Bielefeld, Germany

[3] Bielefeld Univ, Fac Phys, Expt Biophys & Appl Nanosci, Univ Str 25, D-33615 Bielefeld, Germany

来源：

CORROSION AND MATERIALS DEGRADATION | 2023年 / 4卷 / 01期

关键词：

micro-corrosion cell; in situ investigations; pitting corrosion; stainless steel; current density-potential curves; SULFIDE INCLUSIONS; PIT INITIATION; PROPAGATION; BOUNDARY; BEHAVIOR;

D O I：

10.3390/cmd4010007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to investigate the electrochemical pitting corrosion in more detail, a micro-corrosion cell was developed, allowing real-time in situ optical observations of steel surfaces in direct correlation with electrochemical measurement results. In this study, the austenitic 1.4301-X5CrNi18-10 and the ferritic 1.4016-X6Cr17 stainless steel grades were examined in electrolytes containing chloride ions. The micro-corrosion cell revealed a stable pitting corrosion of the ferritic 1.4016 and metastable pitting corrosion of the austenitic 1.4301. The pits were characterized by means of scanning electron microscopy (SEM) and atomic force microscopy (AFM) in detail. A clear correlation between current peaks in the current density-potential curve and the growth of many small pits on the test surface was established and was identified as metastable pit growth. In general, the pitting corrosion potential increased as the diameter of the test surface decreased for both stainless steels. In contrast to the complex precipitates of 1.4301, chromium precipitates with a significantly higher amount was detected on the entire surface of the 1.4016. The corrosion initiation was identified at the interface between the precipitates and the base material for both stainless steels. By comparing both materials, the ferritic 1.4016 had a lower pitting corrosion potential than the austenitic 1.4301 under all test conditions.

引用

页码：104 / 119

页数：16