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

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.

► 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.