Removal of coatings around thin-walled ligaments or potentially defective structures require a precision tool that does not impact the structure leading to failure. The removal of any metal or damage to the surface must be avoided in these scenarios, which disqualifies highly abrasive removal methods such as blast cleaning and water-jetting. Atmospheric plasma coating removal (APCR) is a precision tool that can remove the layers of the original coating and modify the surface properties of the bare metal surface to promote chemical adhesion by increasing surface energy. Presented in this work will be our results on the removal efficiency of the original coating, change in water contact angle (adhesion promotion) before and after plasma treatment, and the increased adhesion strength shown by standard adhesion tests. Multiple metal surfaces and adhesives will be presented that represent the commonly used materials for naval and infrastructure industries.

Subject
Coating removal, Zinc rich coatings, Steel surfaces, Water, Metal surfaces, Adhesive strength, Plasma, Substrate surfaces, Mechanical failure, Steel, Rust, Steel grit, Adhesion
Keywords:
Chemical adhesion, coating removal, adhesion promotion, water contact angle, wettability, plasma
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2022
Association for Materials Protection and Performance (AMPP)
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