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AC 43.13-1B 9/8/98 FIGURE 6-9. Inter-granular Corrosion of 7075-T6 aluminum adjacent to steel fastener. FIGURE 6-10. Exfoliation corrosion. 6-19. GALVANIC CORROSION. Gal vanic corrosion occurs when two dissimilar metals make contact in the presence of an electrolyte. (See figure 6-11.) It is usually recognizable by the presence of a build-up of corrosion at the joint between the metals. 6-20. STRESS CORROSION CRACKING. This form of corrosion involves a constant or with a damaging chemical environment. The stress may be caused by internal or external loading. a. Internal stress may be trapped in a part of structure during manufacturing proc esses such as cold working or by unequal cooling from high temperatures. Most manu facturers follow up these processes with a stress relief operation. Even so, sometimes stress remains trapped. The stress may be ex ternally introduced in part structure by rivet ing, welding, bolting, clamping, press fit, etc. If a slight mismatch occurs, or a fastener is over-torque, internal stress will be present. b. Internal stress is more important than design stress, because stress corrosion is diffi cult to recognize before it has overcome the design safety factor. The level of stress varies from point to point within the metal. Stresses near the yield strength are generally necessary to promote stress corrosion cracking. (See fig ure 6-12.) However, failures may occur at lower stresses. Specific environments have been identified which cause stress corrosion cracking of certain alloys. cyclic stress, acting in conjunction Page 6-8 Par 6-18PDF Image | AFS-640
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