Corrosion testing of aluminum alloys in different temp

[mrmalcolm]

In EN 13195,it is specified that aluminum alloys supplied in the H116 or H321 temper in the form of sheet, strip and plate shall be subjected to exfoliation corrosion test and intergranular corrosion test. For H112 aluminum alloys supplied in the Otemper H111temper H112 temper, no corrosion test is specified. It is to be discussed that why corrosion test is not necessary for aluminum alloys plates in the temper( such as O temper, H111 temper and H112 temper).

 

[EdStainless]

Because before aging they are much less susceptible to this corrosion attack.
Aging forms a secondary phase that makes exfoliation corrosion much more likely.

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P.E. Metallurgy, consulting work welcomed

 

[mrmalcolm]

One point of view is that the corrosion performance of the aluminum alloys plates in O temper, H111 temper and H112 temper is very good, and the exfoliation corrosion test and intergranular corrosion test are not required. Another argument is that the aluminum alloys plates in O temper, H111 temper and H112 temper cannot pass the exfoliation corrosion test and intergranular corrosion test, so the aluminum alloys plates in O temper, H111 temper and H112 temper is not suitable for frequent direct contact with seawater.