Influence of residual stress, surface roughness and crystallographic texture induced by machining on the corrosion behaviour of copper in salt-fog atmosphere

• Published in: Corrosion science Vol. 61; pp. 162 - 170
• Main Authors: Gravier, J., Vignal, V., Bissey-Breton, S.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-08-2012; Elsevier
• Subjects: A. Copper; Applied sciences; C. Atmospheric corrosion; C. Effects of strain; Corrosion; Corrosion environments; Exact sciences and technology; Metals. Metallurgy; C. Atmospheric corrosion; C. Effects of strain; A. Copper; Salt spray test; Roughness; Machining; Microstructure; Texture; Surface conditions; Residual stress; Atmospheric corrosion; STAINLESS-STEELS; INHIBITION; RESISTANCE; MEDIA; SOIL; PARAMETERS; MODEL; PREDICTION
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2012.04.032

► Mechanisms of corrosion of pure copper after machining in salt fog atmosphere. ► Influence of residual stresses and surface roughness on the corrosion behaviour. ► Influence of the crystallographic texture and lubrication on the corrosion behaviour.
The influence of quadratic stress, crystallographic texture, lubrication and surface roughness generated by superfinish turning on the corrosion behaviour of pure copper was quantified in salt-fog atmosphere. This was done using statistical analysis (Pearson’s correlation matrix). Three compounds were found after corrosion tests: atacamite/paratacamite and a black layer (mixture of the lubricant and the salt atmosphere). Surface characteristics were classified according to their decreasing influence on the formation of atacamite/paratacamite as follows: surface roughness and quadratic stress. Lubrication and the crystallographic texture have the lowest influence on corrosion processes. Surface observations revealed that general dissolution occurred under atacamite/paratacamite.