Abstract
The protective properties of organic coatings on cold rolled aluminum alloy treated in radio-frequency plasma were tested with electrochemical impedance spectroscopy. Individual aluminum alloy (8011) samples coated with solvent- or water-based epoxyphenolic, or solvent-based epoxypolyester, were investigated with and without plasma treatment. Three plasma treatments were carried out using pure NH 3 . The data suggest that treatment with plasma can significantly alter the metallic surface either enhancing or degrading adhesion characteristics. Although contact angle is commonly used in industry to provide information on adhesion, this research indicates that care is needed in employing this parameter.
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