Table 75. Stress Corrosion of 6000 Series Aluminum Alloys 



Alloy 



Stress 

 (ksi) 



Percent 



Yield 

 Strength 



Exposure 



(day) 



Depth 

 (ft) 



Number of 



Specimens 



Exposed 



Number 

 Failed 



Source 



6061T6 

 6061-T6 

 6061-T6 

 6061-T6 

 6061-T6 

 6061-T6 



12 

 30 

 12 

 30 

 12 

 30 



30 



75 

 30 

 75 

 30 



75 



403 

 403 

 197 

 197 

 402 

 402 



6,780 

 6,780 

 2,340 

 2,340 



2,370 

 2,370 



3 

 3 

 3 

 3 

 3 

 3 





 

 

 

 

 



NADC (7) 

 NADC (7) 

 NADC (7) 

 NADC (7) 

 NADC (7) 

 NADC (7) 



"Numbers refer to references at end of report. 



Table 76. Changes in Mechanical Properties of 6000 Series Aluminum Alloys Due to Corrosion 



Alloy 



Exposure 

 (day) 



Depth 

 (ft) 



Tensile Strength 



Yield Strength 



Elongation 



Source 



Original 

 (ksi) 



% Change 



Original 

 (ksi) 



% Change 



Original 

 (%) 



% Change 



6061-T6 

 6061-T6* 

 6061-T6 fc,C 

 6061 -T6 

 6061 -T6 

 6061 -T6 

 6061 -T6 

 6061-T6 

 6061-T6 

 6061 -T6 



123 

 123 

 123 

 403 

 751 

 1,064 

 197 

 197 

 402 

 181 



5,640 

 5,640 

 5,640 

 6,780 

 5,640 

 5,300 

 2,340 

 2,340 

 2,370 

 5 



48 

 44 

 44 

 48 

 48 

 48 

 48 

 44 

 48 

 48 



-7 



-43 



-100 



-11 



-24 



-11 



-5 



-2 



-15 







41 

 38 

 38 

 41 

 41 

 41 

 41 

 38 

 41 

 41 



-2 



-43 



-100 



-19 



-41 



-9 







+ 3 



-9 



+ 2 



17 

 12 

 12 

 17 

 17 

 17 

 17 

 12 

 17 

 17 



-58 

 -85 

 -100 

 -58 

 -73 

 -61 

 -42 

 -57 

 -70 

 -9 



CEL (4) 

 NADC (7) 

 NADC (7) 

 CEL (4) 

 CEL (4) 

 CEL (4) 

 CEL (4) 

 NADC (7) 

 CEL (4) 

 CEL (4) 



Numbers refer to references at end of report. 



Transverse butt weld, 6061 electrode, TIG process. 



Transverse welds excessively corroded; not possible to obtain tensile specimens. 



215 



