论文部分内容阅读
作者研究了硅的添加量对55％Al-Zn-1.6％Si合金热镀层组织形貌及耐蚀性的影响。结果证明,少量的硅(1～2％之间)对合金组织及耐蚀性基本上无影响;而过量的硅(>2％)将以硅化物或单体硅的形式在枝晶间富锌伪共晶相中析出,从而加大镀层合金表面的电化学不均匀性,降低其耐蚀性。应用计算机解析计算了由多相组成的电极上的腐蚀电流,并结合应用模拟相方法定量描述了此合金镀层的耐蚀性随硅含量的变化关系。
The authors studied the effect of silicon addition on the microstructure and corrosion resistance of a 55% Al-Zn-1.6% Si alloy. The results show that a small amount of silicon (between 1 and 2%) has virtually no effect on the microstructure and corrosion resistance of the alloy; whereas an excess of silicon (> 2%) will act as a silicide or monomeric silicon Zinc pseudo-eutectic phase precipitation, thereby increasing the coating alloy surface electrochemical inhomogeneity and reduce its corrosion resistance. The corrosion current on the electrode composed of multiphase was calculated by computer analysis, and the relationship between the corrosion resistance and the silicon content of the alloy coating was quantitatively described in combination with the simulation method.