Influence of coating formulation variables and processing on the adhesion of melamine-crosslinked polyester primer to urethane-crosslinked epoxy electrocoat

The role of spray-primer formulation chemistry towards robustness of adhesion to an epoxy-based electrocoat was examined for a range of coatings representative of those used in automotive OEM applications. For coatings exhibiting degraded adhesion perfomrance, high-resolution x-ray photoelectron spe...

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Bibliographic Details
Published inJournal of coatings technology Vol. 72; no. 905; pp. 61 - 5
Main Authors Haack, Larry P., Holubka, Joseph W.
Format Journal Article
LanguageEnglish
Published Blue Bell American Coatings Association, Inc 01.06.2000
Federation of Societies for Coatings Technology
Subjects
Acids
Chemistry
Laboratories
Ovens & stoves
Paints
Polyesters
Protective coatings
Resins
Solvents
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Summary:The role of spray-primer formulation chemistry towards robustness of adhesion to an epoxy-based electrocoat was examined for a range of coatings representative of those used in automotive OEM applications. For coatings exhibiting degraded adhesion perfomrance, high-resolution x-ray photoelectron spectroscopy (XPS) identified the presence of a surface-active polyether-based anti-cratering agent (ACA) formulated into the epoxy-based electrocoat at the primer/electrocoat interface. The adhesion performance of the better-performing systems was found to be related to the spray-primer's ability to accommodate the ACA by either absorbing or displacing it from the electrocoat surface, thus diluting it to concentrations no longer adversely affecting adhesion.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0361-8773
2168-815X
DOI:10.1007/bf02757874