Surface effects in chromate conversion coatings on 2024-T3 aluminum alloy
作者： X. Sun , R. Li , K. C. Wong , K. A. R Mitchell , T. Foster
关键词: X-ray photoelectron spectroscopy 、 Transmission electron microscopy 、 Metallurgy 、 Conversion coating 、 Corrosion 、 Alloy 、 Chromate conversion coating 、 Materials science 、 Scanning electron microscope 、 Coating
摘要: Chromate conversion coatings formed on samples of 2024-T3 aluminum alloy, which had been given different pre-treatments, were examined by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), scanning (SEM) and corrosion tests. Two pre-treatments considered, namely a simple mechanical polish, polishing followed an etch in HF-H2SO4 solution. The latter treatment leads to significant Cu enrichment at the oxide-alloy interface, this turn can lead deleterious effect protection afforded subsequently applied chromate coating. Discussions are behaviour coating sample that received acid pre-treatment. This involves both migration through non-uniform redeposition surface. By contrast, initially was just polish pre-treatment does not show surface region, appeared stable after 24 h immersion NaCl test
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