Corrosion propagation behavior of magnesium alloys under atmospheric condition

S. Takigawa, I. Muto, N. Hara

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

To investigate the corrosion mechanism of magnesium alloys under atmospheric conditions, field exposure tests were performed. In a marine environment, AZ31B and AZ91D alloys experienced localized corrosion, including pitting and filiform corrosion. In order to reproduce such actual atmospheric corrosion in a laboratory experiment, we employed a wet-dry cyclic test at a constant dew point. From the results of the wet-dry cyclic tests, the propagation mechanism of localized corrosion on magnesium alloys has been discussed. Localized corrosion occurred during the wetting period, and the corroded sites thus formed were repassivated during the drying period. In the next wetting period, new localized corrosion took place, but the repassivated sites were not reactivated. The repassivated sites have higher corrosion resistance than the non-corroded part of the surface because of the barrier effect of the corrosion products. In the case of AZ91D, Al enrichment in the surface region of the metal matrix is responsible for this corrosion resistance.

Original languageEnglish
Title of host publicationECS Transactions - Corrosion in Marine and Saltwater Environments 3 - 214th ECS Meeting
Pages71-84
Number of pages14
Edition43
DOIs
Publication statusPublished - 2009 Nov 23
EventCorrosion in Marine and Saltwater Environments 3 - 214th ECS Meeting - Honolulu, HI, United States
Duration: 2008 Oct 122008 Oct 17

Publication series

NameECS Transactions
Number43
Volume16
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

OtherCorrosion in Marine and Saltwater Environments 3 - 214th ECS Meeting
CountryUnited States
CityHonolulu, HI
Period08/10/1208/10/17

ASJC Scopus subject areas

  • Engineering(all)

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    Takigawa, S., Muto, I., & Hara, N. (2009). Corrosion propagation behavior of magnesium alloys under atmospheric condition. In ECS Transactions - Corrosion in Marine and Saltwater Environments 3 - 214th ECS Meeting (43 ed., pp. 71-84). (ECS Transactions; Vol. 16, No. 43). https://doi.org/10.1149/1.3114950