COMPARISON OF STRESS-CORROSION RESISTANCE OF BARE X2020-T6 SHEET AND BARE 7075-T6 SHEET
GENERAL DYNAMICS CORP POMONA CA POMONA DIV
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End supported, centrally loaded, 0.063 in. x 1 in. x 9 in. beams of X 20 and 7075-T6 aluminum alloy sheet, held in an insulated clamping fixture were stressed to 80 of their ten tensile yield strength and exposed to salt spray atmosphere for 250 hours. At the end of the salt spray exposure no stress corrosion cracking was observed either in the X2020-T6 or 70 5-T6 alloy. During the salt spray corrosion exposure the X2020-T6 alloy pitted severely at the frequency of three to six 18 in. diameter by 116 deep pits per square inch. The 7075-T6 material did not pit as a result of salt spray corrosion exposure.
- Metallurgy and Metallography
- Properties of Metals and Alloys