An Evaluation into the Cause of Corrosive Failure in Autophoretic Coated Material

摘要

This paper documents a study of performance failures in Autophoretic~? (A-coat or AP) coatings. As AP is a proprietaryrnprocess and coating material, limited research has been published regarding the field performance of this coating technique.rnThe specific failure under analysis in this study was corrosion. The study was performed at the request of a manufacturer thatrnwas experiencing pre-mature failures in the field on product coated using this process and material. Prepared samples werernevaluated using several analysis techniques including, BET Gas Absorption Testing, Optical Microcroscopy, FE-SEM, andrnCorrosion-Rate Analysis. Samples were subjected to the Society of Automotive Engineers (SAE) – Surface VehiclernStandard, J2334 Cosmetic Cyclical Corrosion Lab Test to accelerate the corrosion process, simulating long-term fieldrnconditions. Micro-cracks and pores were identified in the final finished surface that proved to be the point of origin ofrnextensive corrosion that was the result of creep under the surface of the finish and ultimate delimitation.