Effect of Crevice Length on Potential, Current and pH Distribution in the Crevice Formed in Galvanic Coupling Between AA7050-T7451 and SS316
Abstract
Stainless steel fasteners connecting aluminum-alloy components in airframes are frequently encountered after repair. Airframe components are exposed to atmospheric marine environments which lead to the formation of a thin surface electrolyte containing chloride species. This thin film / galvanic couple configuration inherently aids in the trapping/wicking of electrolyte into a tight crevice. Severe localized corrosion can result from the galvanic cell established between the aluminum alloy component and the stainless steel fastener. There are several external variables (crevice solution chemistry, crevice length, conductivity, and etc.) affecting electrochemical distributions in the crevice of galvanic coupling. Understanding the effects of such variables will help quantitatively characterize the corrosion behavior of the structure and inform decisions regarding mitigation strategies.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 07, 2015
- Source ID
- 10.1149/ma2015-02/14/707
Entities
People
- Chao Liu
- John R. Scully
- Robert G. Kelly
- Veronica N. Rafla