Effect of microcrystallization on corrosion resistance of AZ91D alloy
Effect of microcrystallization on corrosion resistance of AZ91D alloy
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DOI：
10.1016/j.electacta.2005.08.023
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发表时间：
2006-03
影响因子：
6.6
通讯作者：
Ying Li;Tao Zhang;Fu-hui Wang
中科院分区：
文献类型：
--
作者：
Ying Li;Tao Zhang;Fu-hui Wang
采用气体收集法和电化学测试法研究了铸态、均匀化（T4）和微晶化（mc）AZ 91 D镁合金在NaCl水溶液中的腐蚀行为。用Mott-Schottky方法研究了在铸造合金和MC合金上形成的产物膜的电容特性。结果表明，晶粒尺寸和β相对AZ 91 D合金的耐蚀性有显著影响。随着阳极电位的升高，产物膜表现为P型半导体。透射电镜观察表明，在mc合金表面生成的产物膜的粒径（<10 nm）远小于铸态合金表面的产物膜的粒径（200 nm），这可能有利于mc合金表面产物膜的能带加宽和受主浓度的降低。
Corrosion behavior of cast, homogenized (T4) and microcystallized (mc) AZ91D alloy was investigated in NaCl aqueous solution by gas collection and electrochemical measurement. The capacitance property of the product films formed on mc alloy and cast alloy was studied by Mott-Schottky approach. The results implied that the grain size have a significant influence on the corrosion resistance of AZ91D alloy as well as β phase. The product films behaved as P-type semiconductor with the increasing of anodic potential. TEM observation indicated that the particle size of the product film on the mc alloy (<10nm) was far smaller than that on the cast alloy (200nm), which might be beneficial to the widening of energy band and the decreasing of acceptor concentration in the product film on mc alloy.