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采用盐水浸泡试验研究了铸态(F)、500℃固溶(T4)和250℃时效16 h(T5)的AZ31-0.6Sr镁合金在w(NaCl)=3.5%溶液中的腐蚀行为。结果表明,铸态镁合金耐腐蚀性能最差,T5态耐腐蚀性能有所提升,T4态合金耐腐蚀性能最好。合金腐蚀速率随热处理状态的变化与其微观组织有关,铸态合金中的富Sr化合物能与基底α相构成电偶腐蚀而加剧合金腐蚀;T5态下出现了连续分布的β相能在一定程度上起腐蚀阻挡层作用,降低合金腐蚀速率。
The corrosion behavior of AZ31-0.6Sr magnesium alloy in w (NaCl) = 3.5% solution at as-cast (F), solution at 500 ℃ (T4) and aging at 250 ℃ for 16 h (T5) The results show that the corrosion resistance of as-cast magnesium alloy is the worst, the corrosion resistance of T5 is improved, and the corrosion resistance of T4 alloy is the best. The corrosion rate of the alloy changes with the microstructure of the alloy due to the heat treatment. The Sr-rich compound in the as-cast alloy can form galvanic corrosion with the α phase of the matrix, which aggravates the corrosion of the alloy. In the T5 state, the continuous distribution of β phase can occur to a certain extent Corrosion barrier function, reducing the alloy corrosion rate.