Improved Magnesium Protection for DoD Aviation And Weapon Component Technology
Abstract
Introduction and Objectives: All military aviation platforms have magnesium castings, however, magnesium is a very electrochemically "active" metal which leads to moisture induced corrosion and galvanic corrosion due to mating with dissimilar metals. During the overhaul phase of the aviation magnesium components the protective coating, primer and topcoat paint are stripped off to allow visual and penetrant inspection of the casting. After passing the inspection, the magnesium castings are dipped in a chemical conversion coating such as DOW 7 or DOW 19 before being placed back into service. Both of these DOW coatings contain hexavalent chromium (Cr6+). The objective of the Tagnite demonstration at the CCAD plating shop is to eliminate the use of hexavalent chromium DOW 7 and DOW 19 tanks that are currently being used. This will be accomplished by masking off the dissimilar metals and applying the anodized coating Tagnite to these legacy magnesium components. The advantages of the Tagnite anodize coating are twofold: 1) The Tagnite electrolyte and anodic coating contain no hazardous materials and 2) The Tagnite coating has better corrosion resistance than the currently used hexavalent chromium coatings.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 18, 2019
- Accession Number
- AD1074816
Entities
People
- Kyu C. Cho
- William C. Jr Gorman