Explanation should include
- oxidation—on the surface/skin of an aircraft
- galvanic—dissimilar metals
- filiform—uncured wash primer
- exfoliation—advanced stage of intergranular
- oxygen concentration cell corrosion—under lap joints, beneath masking tape, under ferrules on aluminum fluid lines
- metallic ion concentration corrosion—under lap joints
- stress corrosion—on bell cranks with pressed-in bushings, landing gear shock struts with pipe-thread grease fittings, clevis pin joints, shrink fits, overstressed tubing with B-nuts, over torquing
- fretting corrosion—around skin surface rivets.
ACS:
AM.I.G.K3
Process/Skill Questions:
- Why is it important to recognize where each type of corrosion occurs on the aircraft?
- How can a mechanic reduce stress corrosion on an aircraft?