Environment-regulation-compliant replacement coatings for use in various aerospace programs were evaluated. Although coatings that employ chromate primers and conversion coatings work effectively, enacted and pending changes in government regulations make it imperative that alternative coating systems be developed and evaluated. An integral part of the present investigation involved the use of electro-chemical impedance spectroscopy to screen candidate coating systems. Preliminary results indicated that ion vapor-deposited aluminum afforded protection to AA2219-T87 (UNS A92219) and type 4340 (UNS G43400) steel substrates at least as good as the protection afforded by more-conventional coating systems. Results from electrochemical impedance spectroscopy measurements provided reliable predictions on the performance of the various coating systems.

Subject
Steel panels, Primers, Electrochemical impedance spectroscopy, Coating application, Marine environments, Top coats, Seawater, Polyurethanes, Polyurethane coatings, Steel, Maritime, Corrosion protection, Blistering
Keywords:
AA2219-T87, aluminum, coatings, electro-chemical impedance spectroscopy, epoxy, ion vapor deposition, polyurethane, seawater, steel, type 4340 steel
NACE International
1994
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