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A protective‐decorative Cathodic conversion coating on steel
Author(s) -
Keping Han,
Jingli Fang
Publication year - 1996
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19960470706
Subject(s) - molybdenum , coating , cathodic protection , sodium molybdate , materials science , molybdate , layer (electronics) , x ray photoelectron spectroscopy , carbon steel , corrosion , metallurgy , phosphorus , inorganic chemistry , anode , chemistry , electrode , chemical engineering , composite material , engineering
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.