Inorganic Cr-free conversion coatings for high corrosion resistance and low electrical contact resistance

R. G. Buchheit, M. A. Martinez, L. P. Montes, N. Celia, G. E. Stoner, S. R. Taylor

Research output: Contribution to journalConference articlepeer-review

Abstract

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.

Original languageEnglish
JournalNACE - International Corrosion Conference Series
Volume1998-March
StatePublished - 1998
EventCorrosion 1998 - San Diego, United States
Duration: Mar 22 1998Mar 27 1998

Keywords

  • Conversion coatings
  • Cr-free conversion coatings
  • Electrical contact resistance
  • Electrochemical impedance spectroscopy
  • Salt spray exposure

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)
  • Materials Science (all)

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