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Mechanism of Corrosion and Delamination of Painted Phosphated Steel During Accelerated Corrosion Testing
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English
Abstract
A THEORETICAL MODEL for the delamination of organic coatings from zinc-phosphated steel surfaces will be presented. It will be shown that under ambient conditions and in neutral NaCl media delamination occurs as a result of the formation of a surface-tension gradiant during oxygen depolarization and, subsequently, the disruption of adhesion at the coating-phosphate interface. Dissolution of the phosphate coating occurs only after adhesion is lost. An accelerated cathodic delamination test showing good correlation with the long-term GM-scab test will also be introduced.
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Authors
Citation
Knaster, M. and Parks, J., "Mechanism of Corrosion and Delamination of Painted Phosphated Steel During Accelerated Corrosion Testing," SAE Technical Paper 860110, 1986, https://doi.org/10.4271/860110.Also In
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