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

•Corrosion of single-phased Cu–Sn model alloys in sulphate medium.•Influence of the tin content.•Diffusion coefficient of species towards the corrosion layer.•Bronze corrosion layer gel behaviour. Corrosion of synthetic CuSn bronzes was electrochemically investigated on rotating disc electrode (RDE)...

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Bibliographic Details
Published in:Corrosion science 2013-12, Vol.77, p.46-51
Main Authors: Muller, J., Laïk, B., Guillot, I.
Format: Article
Language:English
Subjects:
A. Alloy
A. Copper
A. Tin
Applied sciences
B. Electrochemical calculation
B. Polarization
Bronzes
C. Passive films
Copper
CORROSION
Corrosion environments
DIFFUSION
DIFFUSION COEFFICIENTS
Electrodes
ELECTRONIC PRODUCTS
Electronics
Exact sciences and technology
Metals. Metallurgy
PASSIVATION
Species diffusion
Sulfates
Tin
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Summary:•Corrosion of single-phased Cu–Sn model alloys in sulphate medium.•Influence of the tin content.•Diffusion coefficient of species towards the corrosion layer.•Bronze corrosion layer gel behaviour. Corrosion of synthetic CuSn bronzes was electrochemically investigated on rotating disc electrode (RDE) in a buffered medium (pH=6.8, deaerated 10-2molL−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 10−10cm2s−1. Such an order of magnitude indicates that corrosion products layer behaves like a gel.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2013.07.025