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Application of scanning Kelvin probe to study the corrosion protection of chromated hot‐dip galvanized steel
Author(s) -
Forget L.,
Delhalle J.,
Mekhalif Z.
Publication year - 2001
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 - 10.1002/1521-4176(200103)52:3<181::aid-maco181>3.0.co;2-3
Subject(s) - galvanization , chromate conversion coating , metallurgy , materials science , cathodic protection , corrosion , chemistry , composite material , anode , layer (electronics) , electrode
The scanning Kelvin probe has been used to study the inhibition mechanisms and the efficiency of chromating of hot‐dip galvanized steel. Our results show that chromate coatings influence the cathodic partial reaction, i.e. oxygen reduction. The beneficial influence of phosphates on the inhibition efficiency of chromate coatings is also evidenced. Scanning Kelvin probe allows to evaluate the quality (efficiency and homogeneity) of the chromating. Finally we can observe that the protective properties of chromating in a lightly corrosive environment are kept.