通过全浸泡腐蚀试验,对23％ Al-Zn-0.3％ Si以及55％ Al-Zn-1.6％ Si(质量分数,下同)合金的腐蚀过程进行了研究,获得了合金在中性氯化钠溶液中浸泡不同时间后的腐蚀产物.结果表明,从整体上看,23％ Al-Zn-0.3％ Si-xMg合金的耐蚀性能优于55％ Al-Zn-1.6％ Si合金,其中耐蚀性能最佳的是23％ Al-Zn-0.3％ Si-1.5％ Mg合金;Zn5(OH)8 Cl2·H2O是23％ Al-Zn-0.3％ Si及55％ Al-Zn-1.6％ Si合金表面的共有腐蚀产物,而23％ Al-Zn-0.3％ Si-1.5％ Mg和23％ Al-Zn-0.3％ Si-3％ Mg合金的表面腐蚀产物为Mg3O(CO3)2;在浸泡后期,55％ Al-Zn-1.6％Si合金的失重曲线增长放缓,其原因是发生了腐蚀产物的物相转变Zn5(OH).Cl2·H2O→Zn0.67 Al0.a3(OH)2(CO3)0 165·xH2O.
The corrosion process of 23 ％ Al-Zn-0.3 ％ Si and 55 ％ Al-Zn-1.6 ％ Si alloy (by mass,the same below) was studied by the total immersion corrosion test.The corrosion products of the alloy immersed in neutral sodium chloride solution for different times were obtained.The results showed that the corrosion resistance of 23％ Al-Zn-0.3％ Si-xMg alloy was better than that of 55％ Al-Zn-1.6％ Si alloy,among which the 23％ Al-Zn-0.3％ Si-1.5％ Mg alloy possessed the best corrosion resistance.In addition,the Zn5 (OH)8 Cl2 · H2O was the common corrosion product on the surface of 23％Al-Zn-0.3％ Si and 55％ Al-Zn-1.6％ Si alloys,while the corrosion product of 23％ Al-Zn-0.3％ Si-1.5％ Mg and 23％ Al-Zn-0.3％ Si-3％ Mg alloys was Mg3O(CO3) 2· The weight loss curve of 55％ Al-Zn-1.6％ Si alloy increased slowly in the late stage of immersion,which arised from the phase transformation of Zn5 (OH) 8 Cl2 · H2O to Zn0.67 Al0.33 (OH) 2 (CO3) 0.165 · xH2O.
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