Corrosion Prediction for Nonchrome Based Coatings Systems

Coatings are critical aerospace materials that require well-defined performance and lifetime characteristics. They perform multiple functions on aircraft but one of the more important functions is for prevention of corrosion. Some coatings application areas are expected to last the lifetime of the aircraft after application. The qualification test methods currently used to determine corrosion protection provided by a coating do not accurately predict the lifetimes of coatings products. In fact, the current qualification tests age test specimens for the equivalent of less than two year of service based on the acceleration factors for humidity and temperature. TRI/Austin, Inc. and PPG Industries propose the development of a new corrosion test protocol that will enable determinations of corrosion resistance imparted by coatings on metal substrates. A primary Phase I goal is determination of the primary factors that influence corrosion rates. While this work specifically targets coatings exposures, the outcomes will be applicable to other aircraft corrosion control materials.