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Combination of thermal activation and addition of H 2 O 2 to improve cerium‐based immersion treatment of alloy AA5083
Author(s) -
Bethencourt M.,
Botana F. J.,
Cano M. J.,
Osuna R. M.,
Marcos M.
Publication year - 2003
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.200390024
Subject(s) - cerium , alloy , corrosion , lanthanide , thermal treatment , materials science , metal , chemical engineering , metallurgy , chemistry , ion , composite material , organic chemistry , engineering
Intensive research has been undertaken in recent years aimed at finding non‐contaminating alternatives to surface treatment processes based on the use of chromates. One of the alternatives proposed involves the use of lanthanide salts, and a variety of methods of protection have been described. In this study, the results of the treatment of samples of alloy AA5083 in a solution of Ce(III) at 323 K and incorporating small quantities of oxygenated water are presented. These results indicate that the application of this type of treatment gives a considerable reduction in the time required for this process and high levels of protection. This time reduction is associated with a combined effect caused, in part by the presence of oxygenated water, which facilitates the formation of islands of cerium, and in part by thermal activation, which facilitates a more rapid development of the alumina film over the metal matrix. Lastly, the results obtained indicate that these treatments provide increased resistance of the alloy against pitting corrosion.