4.7 Article

α-CuSn bronzes in sulphate medium: Influence of the tin content on corrosion processes

期刊

CORROSION SCIENCE
卷 77, 期 -, 页码 46-51

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2013.07.025

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Alloy; Copper; Tin; Electrochemical calculation; Polarization; Passive films

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Corrosion of synthetic CuSn bronzes was electrochemically investigated on rotating disc electrode (RDE) in a buffered medium (pH = 6.8, deaerated 10(-2) mol L-1 Na2SO4 solution). Copper species diffusion coefficients through the patina for various tin-content bonzes were analyzed and provided information about its organization. A joined mass-transport and electronic transfer process controls the corrosion. A faster and more efficient passivation was observed with highest bronze tin-content. Also, copper species diffusion through the layer is independent of the tin content and few 10(-10) cm(2) s(-1). Such an order of magnitude indicates that corrosion products layer behaves like a gel. (C) 2013 Elsevier Ltd. All rights reserved.

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