An investigation into the surface layers formed on oxidised copper exposed to SO2 in humid air under hypoxic conditions

作者：Giovannelli G; Natali S; Zortea L; Bozzini B^*

来源：Corrosion Science, 2012, 57: 104-113.

DOI：10.1016/j.corsci.2011.12.028

• SEM
• XRD
• Atmospheric corrosion
• Anodic films
• Interfaces

Preoxidised Cu surfaces and powdery Cu oxides were exposed to SO2 vapour in an oxygen-deprived humid atmosphere. The reaction products were investigated by XRD and SEM-EDX. Chevreul%26apos;s salt, Cu2SO4 center dot CuSO4 center dot 2H(2)O results to be the only stable product. Cu(0) is detected in experiments on Cu(I) oxide. Based on the competition between Cu(I) disproportionation and Cu(II) reduction by SO2, a reaction pathway is proposed. Initially formed Chevreul%26apos;s salt exhibits orthorhombic symmetry and a phase transformation to the stable monoclinic structure occurs upon ageing at room temperature. A mechanistic analogy with bronze disease of archaeological artefacts has been pointed out.

• 出版日期2012-4