Assessment of corrosion behavior and stress corrosion cracking susceptibility of nanocrystalline bulk Al-Mg based alloys in chloride containing solutions

E. Sikora, B. A. Shaw, M. Sharma-Judd

Research output: Contribution to conferencePaper

Abstract

The corrosion behavior of four nano Al-Mg alloys in chloride-containing environments was evaluated in a series of experiments and compared to those of wrought 5083 aluminum. The corrosion experiments conducted ranged from electrochemical tests in chloride solutions to corrosion fatigue testing in natural seawater. In chloride solutions open to the air, the nano alloys were initially passive, but once stable pitting occurred repassivation was not achieved. The AA 5083 pitted spontaneously at the corrosion potential in all chloride-containing solutions. Nano alloys were more susceptible to IGC than AA 5083. None of the alloys showed susceptibility to exfoliation. In comparison to AA 5083, the nano alloys showed better: Eoc values, Rp values, uniform corrosion rates, cathodic reaction kinetics, and SCC resistance. More variability among the nano alloys was noted in the SCC tests and in the maximum pit depth measurements than was noted in the electrochemical testing. The nano Al-7.5Mg alloy showed better low cycle fatigue performance than AA5083 but was slightly worse than AA 5083 in high cycle fatigue.

Original languageEnglish (US)
Pages244-255
Number of pages12
StatePublished - Dec 15 2005
EventCorrosion and Corrosion Control in Saltwater Environments II - Proceedings of the International Symposium - Honolulu, HI, United States
Duration: Oct 3 2004Oct 8 2004

Other

OtherCorrosion and Corrosion Control in Saltwater Environments II - Proceedings of the International Symposium
CountryUnited States
CityHonolulu, HI
Period10/3/0410/8/04

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Sikora, E., Shaw, B. A., & Sharma-Judd, M. (2005). Assessment of corrosion behavior and stress corrosion cracking susceptibility of nanocrystalline bulk Al-Mg based alloys in chloride containing solutions. 244-255. Paper presented at Corrosion and Corrosion Control in Saltwater Environments II - Proceedings of the International Symposium, Honolulu, HI, United States.