X-ray computed tomography (XCT) was used to nondestructively observe the hidden corrosion damage operando on aluminum alloy (AA) 7050-T7451 coupled to stainless steel (SS) 304 under a droplet of chloride-containing electrolyte. XCT enabled a three-dimensional assessment of corrosion damage evolution. AA7050 cylinders containing concentric embedded SS304 cylinders simulating a fastener were exposed under NaCl droplets at 97% RH for various times. Both the volume of corrosion damage and the initial volume of constituent particles were monitored and considered for further analysis. Three-dimensional image reconstruction indicated that the combination of stainless steel and constituent particles could support the growth of several corrosion fissures over the exposure period.

Subject
Constituents, Steel surfaces, Materials, Droplets, Geometry, Sodium chloride, Corrosion initiation, Wiring, Fissures, Stainless steel, Fasteners, Aluminum alloys, Types of corrosion
Keywords:
aluminum alloy 7050, galvanic corrosion, simulated fastener, x-ray computed tomography
© 2015 NACE International
2015
You do not currently have access to this content.