Non-chromate conversion coatings compliant with MIL-DTL-55411  have been demonstrated to provide protection comparable to their chromate counterparts. Repair materials are available to address defects in bath-applied conversion coatings from most manufacturers for these products that have been approved under MIL-DTL-817062 , though with significant variations in their application methodology and efficacy. In this work, repair material chemistries from three different vendors were evaluated, working towards a single application method that can be used independent of the selected chemistry. Each coating was then benchmarked against an industry standard chromate conversion coating repair material in terms of both the corrosion performance as well as the capability of each coating to maintain the ability to make low resistance electrical contact to the surface.

Subject
Coating repair, Primers, Coating performance, Coating application, Water, Coatings, Materials, Materials performance, Coating materials, Salt spray corrosion testing, Alloys, Chemical conversion coatings, Samples
Keywords:
Aluminum, Chromate, Non-chromate, Conversion Coating, Repair
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2022
Association for Materials Protection and Performance (AMPP)
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