PROTECTIVE COATINGS FOR MAGNESIUM ALLOYS. PART 2. RESISTANCE OF FLAME-FUSED TEFLONCOATED MAGNESIUM AND ALUMINUM ALLOYS TO CORROSION BY 3% SODIUM CHLORIDE SOLUTIONS.
Abstract
Teflon one-coat green enamel, which has been applied in thin films, 0.0002 to 0.0004 in. thick, and which has been properly flame fused, will not be wet by the 3% sodium chloride solution during the test period; specimens having such Teflon coatings exhibit enhanced corrosion resistance. Three methods were evaluated as accelerated corrosion tests: an immersion test, a salt droplet test, and a spherical-joint contact test which could be modified to measure the relative resistance of the coated specimens. Magnesium alloy AZ31B-H24, chrome pickled, was most resistant to corrosion when coated with flamefused Teflon one-coat green enamel; magnesium alloy specimens treated otherwise exhibited enhanced corrosion rates. Aluminum alloy 6061-T6, Teflon coated and flame fused, exhibited the greatest corrosion resistance when compared with the other aluminum alloys tested. No correlation was found between the various aluminum alloy tempers studied and the corrosion rate. In general, the corrosion tests indicate that the flame-fused Teflon coating afforded some protection against corrosion as compared to the uncoated specimens.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 15, 1965
- Accession Number
- AD0626213
Entities
People
- A. G. Sands
- D. L. Venezky
- E. B. Simmons Jr.
Organizations
- United States Naval Research Laboratory