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Adhesion and corrosive delamination of epoxy films on chemically etched ZnMgAl‐alloy coatings
Author(s) -
Pohl K.,
Ozcan O.,
Voigt M.,
Grundmeier G.
Publication year - 2016
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.201608968
Subject(s) - epoxy , adhesive , adhesion , materials science , delamination (geology) , alloy , composite material , kelvin probe force microscope , chemical composition , paint adhesion testing , atomic force microscopy , layer (electronics) , chemistry , nanotechnology , paleontology , organic chemistry , biology , subduction , tectonics
The effect of alkaline and acidic pretreatment steps on the surface chemical composition and adhesion properties of ZnMgAl‐alloy coated steel was investigated by means of spectroscopic methods, scanning Kelvin probe (SKP) and peel test measurements. The spectroscopic results indicate that the surface film composition can be adjusted by the wet‐chemical treatment. To study the corresponding surface adhesive properties, the samples were coated with an epoxy amine adhesive. Peel tests under humid conditions indicated an increased interaction between the acidic pre‐treated surface and the adhesive. The results of the SKP analysis show that the acidic cleaned substrates have the highest resistance to delamination, which can be explained by the shift of the interfacial electrode potential.