In order to develop an environment-friendly method of forming a chemical conversion
coating on 2024 aluminium alloy surface without the toxic hexavalent chromium compounds, in
this paper a process with sodium molybdate and potassium permanganate as the main compositions
of the treating bath has been investigated. Solution composition and process parameters have been
optimized. The chemical conversion coating has good corrosion resistance, evaluated with dropping
test. Micro-structure and components of the conversion coating have been studied by various
micro-analysis methods, and the growth mechanism of the chemical conversion coating has also
been investigated.
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