Initial atmospheric corrosion of zinc in presence of Na_2SO_4 and (NH_4)_2SO_4  

作　　者：屈庆 李蕾 白玮 严川伟 

机构地区：[1]Department of Chemistry, Yunnan University, Kunming 650091, China [2]Department of Chemistry, Yunnan Nationalities University, Kunming 650092, China [3]Stake Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

出　　处：《中国有色金属学会会刊：英文版》2006年第4期887-891,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project(50261004) supported by the National Natural Science Foundation of China

摘　　要：Initial atmospheric corrosion of zinc in the presence of Na2SO4 and (NH4)2SO4 was investigated via quartz crystal microbalance(QCM) in laboratory at relative humidity(RH) of 80% and 25 ℃. The results show that both Na2SO4 and (NH4)2SO4 can accelerate the initial atmospheric corrosion of zinc. The combined effect of Na2SO4 and (NH4)2SO4 on the corrosion of zinc is greater than that caused by (NH4)2SO4 and less than that caused by Na2SO4. Fourier transform infrared spectroscopy(FTIR), X-ray diffractometry(XRD) and scanning electron microscopy(SEM) were used to characterize the corrosion products of zinc. (NH4)2Zn(SO4)2, Zn4SO4(OH)6·5H2O and ZnO present on zinc surface in the presence of (NH4)2SO4 while Zn4SO4(OH)6·5H2O and ZnO are the dominant corrosion products on Na2SO4-treated zinc surface. Probable mechanisms are presented to explain the experimental results.Initial atmospheric corrosion of zinc in the presence of Na2SO4 and （NH4）2SO4 was investigated via quartz crystal microbalance（QCM） in laboratory at relative humidity（RH） of 80% and 25 ℃. The results show that both Na2SO4 and （NH4）2SO4 can accelerate the initial atmospheric corrosion of zinc. The combined effect of Na2SO4 and （NH4）2SO4 on the corrosion of zinc is greater than that caused by （NH4）2SO4 and less than that caused by Na2SO4. Fourier transform infi＇ared spectroscopy（FTIR）, X-ray diffractometry（XRD） and scanning electron microscopy（SEM） were used to characterize the corrosion products of zinc. （NH4）2Zn（SO4）2, Zn4SO4（OH）6.5H20 and ZnO present on zinc surface in the presence of （NH4）2SO4 while Zn4SO4（OH）6·5H2O and ZnO are the dominant corrosion products on Na2SO4-treated zinc surface. Probable mechanisms are presented to explain the experimental results.

关 键 词：锌 NA2SO4 (NH4)2SO4 大气腐蚀 微量天平 

分 类 号：TG172[金属学及工艺—金属表面处理]