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XPS AND AES STUDIES OF ANTICORROSIVE COLOUR FILM ON ZINC |
HAN Keping FANG Jingli(Department of Chemistry; Applied Chemistry Institute; Nanjing University) |
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Abstract Colourful conversion films were formed on zinc surface with cathodic polarization method from a molybdate-phosphate type aqueous solution. It was found from the results of salt spray corrosion tests that the golden film exhibited excellent anticrrosive performance. The results of XPS and AES analyses showed that the thickness of the golden film was about 75nm and Mo existed as Mo(VI) in the outer layer of the film. The relative atomic percent contents (A.C.%) of the golden film calculated at the constant elemental composition section on the AES profile curves were O 56.9%; Mo 26.8%; P 11.0%; Zn 5.3%.
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Received: 25 February 1997
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