Journal
ELECTROCHIMICA ACTA
Volume 82, Issue -, Pages 333-338Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.06.048
Keywords
Stainless steel; Nanopores; Electropolishing; Organic electrolyte; Water content
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Funding
- Priority Assistance of the Formation of Worldwide Renowned Centers of Research - Global COE Program from the Ministry of Education, Sports, Culture, Science and Technology of Japan
- Japan Society for the Promotion of Science [23246128, 22360307]
- Iron and Steel Research Promotion Grant from the Iron and Steel Institute of Japan
- Grants-in-Aid for Scientific Research [22360307, 23246128] Funding Source: KAKEN
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The present work reports the formation of self-organized pores on type 316 stainless steel by the electrochemical treatment in organic solvents. The electrochemical treatment consists of a potential ramp from 0 V to desired applied potentials and subsequent potentiostatic polarization at the desired applied potentials. Pores are formed on stainless steel surface in various organic solvents when they contain perchloric acid. In ethylene glycol electrolyte containing 10 vol.% perchloric acid pores with the average diameter of 150 nm and the average depth of 10 nm are formed already after the potential ramp to 40 V. The diameter and depth of pores drastically increase in the early stage of the treatment and then becomes slightly smaller. The applied potential also affects the porous morphology, that is, the diameter and depth linearly increase with increasing applied potential. Water into the organic solvent can drastically enhance the growth rate of pores. (c) 2012 Elsevier Ltd. All rights reserved.
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