Effects of Thiocyanate on Anodic Dissolution of Iron, Chromium, Nickel and Type 304 Stainless Steel. II. Surface Analysis by XPS

Li, Wen; Pistorius, P. Chris

doi:10.1149/2.069211jes

Effects of Thiocyanate on Anodic Dissolution of Iron, Chromium, Nickel and Type 304 Stainless Steel. II. Surface Analysis by XPS

Journal Article · Fri Sep 14 00:00:00 EDT 2012 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.069211jes· OSTI ID:1051007

Li, Wen ^[1]; Pistorius, P. Chris

Carnegie Mellon University

As proposed in Part I of this paper, the accelerating effect of thiocyanate on active dissolution of stainless steel in acid sulfate solution occurs by adsorption of sulfur on the steel surface, causing accelerated dissolution of chromium from the steel surface. Surface analysis (X-ray photoelectron spectroscopy) was performed on pure chromium and nickel, a high-purity Fe-20wt% Cr alloy and Type 430 and Type 304 stainless steel to test the proposed mechanism. Surface analysis of the Fe 20wt% Cr alloy and stainless steels (Types 430 and 304) confirmed that chromium enriched on the metal surface during anodic dissolution in thiocyanate-free solution and that the surface enrichment of chromium was smaller in thiocyanate-containing solution. Surface analysis also confirmed the formation of sulfide or adsorbed sulfur on the Fe-20wt% Cr alloy in thiocyanate-containing solution. Surface restructuring of sulfide-covered electrode (Type 304 stainless steel and nickel) was the possible reason why increased anodic current density was observed immediately following interruption of anodic polarization for periods of 5s to 120s.

Research Organization:: Carnegie Mellon Univ., Pittsburgh, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0005429

OSTI ID:: 1051007

Report Number(s):: DOE/SC0005429-P3

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 11 Vol. 159; ISSN 0013-4651

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
42 ENGINEERING
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