It has been found that the AZ31 magnesium alloy becomes embrittled if pre-exposed to 0.01M NaCl solution prior to tensile testing. The degree of embrittlement increases with increasing the pre-exposure time. In addition, the stress corrosion cracking (SCC) of the AZ31 magnesium alloy has been studied by means of slow strain rate tests (SSRT). The results indicated that the AZ31 magnesium alloy is susceptible to SCC in various solutions. It is proposed that both the pre-exposure embrittlement and SCC are due to the deep penetration of atomic hydrogen and hence resulting in hydrogen embrittlement.
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