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Galvanostatic formation of barrier‐type Anodic oxides
Author(s) -
Ammar I. A.,
Darwish S.,
Khalil M. W.
Publication year - 1981
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19810120904
Subject(s) - anodizing , oxide , metal , materials science , anode , metallurgy , inorganic chemistry , chemistry , chemical engineering , electrode , aluminium , engineering
Experimental Factors Affecting Oxide Growth Results of galvanostatic anodization of various metals with varying valve‐metal behaviour including Nb, Ta, Zr, Ti, Al, W, Te, Sb, and Bi are compiled and compared with respect to the effect of various experimental factors such as surface pretreatment, stirring, solution composition, temperature of the bath, on the efficiency of oxide growth relative to that for other anodic processes. It is concluded that all of the above factors play an important role in the anodization of the non‐typical valve metals, particularly Sb, Bi and W. Typical anodic charging curves associated with the process of oxide growth are given for several valve metals. Experimental data relevant to the phenomena of oxide breakdown are recorded and compared. The results indicate that the mechanism of breakdown varies for the same metal with variations in the experimental conditions.