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98212 INORGANIC CR-FREE CONVERSION COATINGS FOR HIGH CORROSION RESISTANCE AND LOW ELECTRICAL CONTACT RESISTANCE

Picture for 98212 INORGANIC CR-FREE CONVERSION COATINGS
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Product Number: 51300-98212-SG
ISBN: 98212 1998 CP
Author: R.G. Buchheit, M.A. Martinez, L.P. Montes, N. Cella, G.E. Stoner, S.R. Taylor
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Many military applications require that conversion coatings for aluminum alloys provide high corrosion resistance while retaining low electrical contact resistance. In this paper, the performance requirements for Class 1A and Class 3 conversion coatings established in Military Specifications MIL-C- 81706 and MIL-C-5541E are summarized. The corrosion resistance and electrical contact resistance of actual Class 1A and Class 3 coatings are presented. Results show that the required levels of performance are usually achieved on wrought alloys, but not on cast alloys. The corrosion resistance and electrical contact resistance of Cr-free conversion coatings has also been examined. Results indicate that the required performance levels are rarely achieved on any type of alloy substrate. Last, corrosion and electrical properties of coatings formed using methods based on low-toxicity alkaline oxide coatings procedures are described. Results from initial attempts to produce highly corrosion resistant coatings with low electrical resistance are presented. Keywords: Conversion coatings, Cr-free conversion coatings, electrochemical impedance spectroscopy, salt spray exposure, electrical contact resistance.
Many military applications require that conversion coatings for aluminum alloys provide high corrosion resistance while retaining low electrical contact resistance. In this paper, the performance requirements for Class 1A and Class 3 conversion coatings established in Military Specifications MIL-C- 81706 and MIL-C-5541E are summarized. The corrosion resistance and electrical contact resistance of actual Class 1A and Class 3 coatings are presented. Results show that the required levels of performance are usually achieved on wrought alloys, but not on cast alloys. The corrosion resistance and electrical contact resistance of Cr-free conversion coatings has also been examined. Results indicate that the required performance levels are rarely achieved on any type of alloy substrate. Last, corrosion and electrical properties of coatings formed using methods based on low-toxicity alkaline oxide coatings procedures are described. Results from initial attempts to produce highly corrosion resistant coatings with low electrical resistance are presented. Keywords: Conversion coatings, Cr-free conversion coatings, electrochemical impedance spectroscopy, salt spray exposure, electrical contact resistance.
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