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首页> 外文期刊>Corrosion: The Journal of Science and Engineering >Improved Corrosion Protection of Aluminum Alloys by System Approach Interface Engineering: Part 4 - Spray Paint Primer-Coated Aluminum Alloys
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Improved Corrosion Protection of Aluminum Alloys by System Approach Interface Engineering: Part 4 - Spray Paint Primer-Coated Aluminum Alloys

机译：Improved Corrosion Protection of Aluminum Alloys by System Approach Interface Engineering: Part 4 - Spray Paint Primer-Coated Aluminum Alloys

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摘要

This study investigates the development of a chromate free coating system for the corrosion protection of aluminum alloys based on the concept of system approach interface engineering (SAIE) by chemical and plasma techniques. The aluminum alloys investigated include AA2024-T3 ((2B)), AA7075-T6 ((7B)), Alclad 2O24-T3 ((2A)), Alclad 7075-T6 ((7A)), plate stock AA2124-T851 ((2P)), and plate stock AA7050-T7451 ((7P)). Direct current (DC) cathodic plasma processes were used to enhance the bonding and protection of spray paint primers on aluminum alloys. Besides anode magnetron enhancement, the DC cathodic plasma processes were also operated with the anode assembly removed, a more practical approach for industrial applications. With appropriate application, DC cathodic plasma coatings provided not only a corrosion-resistant layer on aluminum alloy surfaces but also excellent adhesion bases for spray paint primers, including both chromated and nonchromated water-borne primers. When tested by sulfur dioxide (SO_2) salt spray and Prohesion salt spray tests, most of these plasma-modified coating systems showed excellent corrosion protection characteristics. All the chromate-flee (waterborne) coating systems based on the SAIE concept outperformed or performed comparably to the chromated controls used in this study coated aluminum alloys). In contrast, many of the plasma coating systems based on chromated primers showed more corrosion on (2B) and (7B) than on their controls. The chromated primer-coated (2B) and (7B) showed severe pitting corrosion away from the scribed lines in both SO_2 and Prohesion salt spray tests. The pitting was scarcely observed (and in most cases did not occur) on nonchromated primer-coated aluminum alloys with the plasma surface modification.

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