4.7 Article

The influence and the mechanism of the precipitate/austenite interfacial C-enrichment on the intergranular corrosion sensitivity in 310 S stainless steel

Journal

CORROSION SCIENCE
Volume 111, Issue -, Pages 352-361

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2016.05.021

Keywords

Stainless steel; STEM; AFM; Intergranular corrosion; Acid corrosion

Funding

  1. National Natural Science Foundation of China [51134011]

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In this study, the intergranular corrosion behavior of 310 S stainless steels after sensitizing at different temperatures were investigated. The chemical content and the Volta potential distribution at the M23C6/austenite interface were analyzed. It is found that the sensitization of 310 S increased significantly with increasing aging temperature, although no obvious variations of the Cr-depletion level or the Volta potential difference at the M23C6/austenite interface could be observed. However, an obvious carbon-enriched zone was observed at the M23C6/austenite interface. A probable mechanism about the correlation between the sensitization of 310 S and the carbon-enrichment was proposed. (C) 2016 Elsevier Ltd. All rights reserved.

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