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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.57  No.11 (2008)  >  pp.1091-1096

Journal of the Society of Materials Science, Japan
<<Previous article Vol.57  No.11 (2008)   pp.1091 - 1096 Next article>>

Susceptibility to Stress Corrosion Cracking of AZ31B Magnesium Alloy by Slow Strain-Rate Technique

Hitoshi UCHIDA1), Masato YAMASHITA1), Satoshi HANAKI1) and Takahiko NOZAKI2)
1) Graduate School of Eng., Univ. of Hyogo
2) Univ. of Hyogo


Due to advantages such as high strength-to-weight ratios, specific castability and recycling efficiency, magnesium alloys are used in a wide variety of industrial applications. Stress corrosion cracking (SCC) tests of AZ31B magnesium alloy in distilled water and 2∼8wt% sodium chloride solutions at 298K were performed with slow strain-rate technique. In a distilled water, the SCC of the magnesium alloy occurs surely and its susceptibility increases with a decrease of strain-rate. This magnesium alloy in sodium chloride solutions is very susceptible to the SCC under open circuit condition, regardless of the strain-rate and solution concentration. The SCC in 4wt% sodium chloride solution under potential-controlled condition occurs near the corrosion potential, which lies to the potential range of hydrogen evolution. Furthermore, the fracture surface is characterized by transgranular quasi-cleavage appearance. The evidence introduced here supports a hydrogen embrittlement for the SCC of AZ31B magnesium alloy in sodium chloride solution, including an anodic dissolution mechanism by chloride ion.


Keyword:
Magnesium alloy, Stress corrosion cracking, Slow strain-rate technique, Hydrogen embrittlement

Received: March 10, 2008
Published online: November 20, 2008
Copyright (c) 2008 by The Society of Materials Science, Japan

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