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A protective-decorative Cathodic conversion coating on steel

✍ Scribed by Han Keping; Fang Jingli

Publisher
John Wiley and Sons
Year
1996
Tongue
German
Weight
437 KB
Volume
47
Category
Article
ISSN
0947-5117

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✦ Synopsis

Abstract

A decorative conversion coating was formed on mild steel from a solution of sodium molybdate and phosphate by cathodic treatment. Anodic corrosion curves demonstrated the good anticorrosive ability of the coating formed. The results of XPS analysis showed that iron existed as iron (II) and iron (III) in the film; molybdenum existed as molybdenum (VI) in the surface layer of the film, while as molybdenum (VI) and molybdenum (IV) in the inner layer of the film; phosphorus in the film was present in the pentavalent state. The relative atomic percent content (A.C.%) of the film was obtained by AES profile to be oxygen 58.6, molybdenum 21.3, phosphorus 10.2, iron 6.5 and carbon 3.4.

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