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Analysis of intergranular corrosion attack of stainless steels by means of atomic force microscopy and optical microscopy. Part 2: Influence of impurity content
Author(s) -
Schlüter B.,
Barkleit G.,
Schneider F.,
Mummert K.
Publication year - 2000
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/(sici)1521-4176(200002)51:2<115::aid-maco115>3.0.co;2-n
Subject(s) - intergranular corrosion , impurity , metallurgy , atomic force microscopy , grain boundary , optical microscope , austenitic stainless steel , corrosion , materials science , austenite , chemistry , analytical chemistry (journal) , scanning electron microscope , nuclear chemistry , microstructure , composite material , nanotechnology , chromatography , organic chemistry
The aim of this study is to compare different methods to quantify intergranular corrosion attack caused by impurity segregation in different austenitic stainless steels with varying impurity contents escpecially of sulfur. Therefore, the boiling nitric acid chromate test was used to produce the intergranular corrosion attack. The methods for quantification of these attacks were weight loss measurements and grooves depth measurements either by optical microscopy at cross sections or by AFM at topography images. Comparison of the results from the different methods show that with any method used the corrosion attack increases with increasing sulfur content. Grooves depth measurements by AFM is therefore an advantageous method to quantify changes to susceptibility to intergranular corrosion because of its high selectivity to grain boundary attack compared to the other methods.