Abstract
The corrosion resistance of chemical conversion coatings formed on mild steel from various P-Mo-V heteropoly acid solutions has been compared with that formed by the salt water dip, CuSO4 spot and H2S tarnish test. The results show that the passivation treatment with Na4PMo11VO40 gives the best protective performance. XPS and AES analyses of the conversion coating of Na4PMo11VO40 heteropoly acid Mo show that Fe, Mo, V and P are mainly present as Fe (III), Mo (VI), V (V) and P (V) respectively in the outerlayer of the film, while the above elements in the inner layer of the film exist partly in some lower valency state with the exception of P. The relative atomic percentages (A.C. %) of film composition obtained from the elemental composition constant region of the AES profile curves are Fe 1.7%, P 10.0%, Mo 34.4%, V 2.7%, O 50.4% and C 0.8%.
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