Imaging and Information Processing of Pitting-Corroded Aluminum Alloy Panels with Surface Metrology Methods
Abstract
It has been established that corrosion is one of the most important factors causing structural deterioration, loss of metal, and ultimately decrease of product performance and reliability. Corrosion monitoring, accurate detection and interpretation are recognized as key enabling technologies to reduce the impact of corrosion on the integrity of critical aircraft and industrial assets. Interest in corrosion measurement covers a broad spectrum of technical approaches including acoustic, electrical and chemical methods. Surface metrology is an alternative approach used to measure corrosive rate and material loss by obtaining surface topography measurement at micrometer levels. This paper reports results from an experimental investigation of pitting corrosion detection and interpretation on aluminum alloy panels using 3D surface metrology methods, image processing and data mining techniques. Sample panels of AA 7075-T6, an aluminum alloy commonly used in aircraft structures, were coated on one side with a corrosion protection coating and assembled in a lap-joint configuration. Then, a series of accelerated corrosion testing of the lap-joint panels were performed in a cyclic corrosion chamber running ASTM G85-A5 salt fog test.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 23, 2014
- Accession Number
- AD1002431
Entities
People
- Douglas Brown
- George J. Vachtsevanos
- Honglei Li
- Javier Echauz
- Jiaming Li
- Margaret R. Garvan
Organizations
- Georgia Tech