Accelerated Corrosion Degradation of Coated Aluminum Alloy Systems through Galvanic Interactions
Abstract
The use of structural aluminum alloys for aircraft is common due to its low density and relatively high strength. While exhibiting significant general corrosion resistance, these alloys are susceptible to various forms of localized corrosion, such as pitting, intergranular corrosion, etc. When in galvanic contact with fasteners noble to the aluminum alloy panel, these phenomena can be much more aggressive. In an effort to mitigate these problems, multi-layer coating systems are utilized to protect the aluminum alloy from aggressive environments and to prevent galvanic contact with dissimilar metals. However, defects in these coatings may lead to galvanic interaction with the fastener and localized attack of the underlying panel. In addition, delamination of coating at these sites can result in accelerated attack as the environment becomes more aggressive in these shielded areas.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 01, 2017
- Source ID
- 10.1149/ma2017-02/10/708
Entities
People
- Gerald S. Frankel
- Joshua T. Boerstler