INITIAL ATMOSPHERIC CORROSION OF ZINC IN THE PRESENCE OF NH4Cl
来源期刊：Acta Metallurgica Sinica2004年第2期
论文作者：C.N.Cao C.W.Yan Q.Qu G.H.Liu L.LI L.ZHANG
Key words：atmospheric corrosion; zinc; NH4 Cl;
Abstract: Influence of NH4 Cl on the initial atmospheric corrosion of zinc was investigated via quartz crystal microbalance(QCM)in laboratory at 80%RH and 25℃.The results show that NH4 Cl can accelerate the initial corrosion of zinc.Mass gain increase with the exposure time,but mass gain in the later doesn't change obviously due to the formation of the insoluble simonkolleite on zinc surface in the presence of NH4 Cl.Fourier transform infrared spectroscopy(FTIR)and X-ray diffraction(XRD)was used to characterize the corrosion products.Zn5 Cl2(OH)s.H2 O,(NH4)2ZnCl4 and ZnO are the corrosion products on zinc.Brief discussion on the mechanisms of atmospheric corrosion of zinc in the presence of NH4 Cl was introduced.
C.N.Cao1，C.W.Yan1，Q.Qu2，G.H.Liu2，L.LI3，L.ZHANG1
(1.Stake Key Laboratory for Corrosion and Protection,Institute of Metal Research,The Chinese Academy of Sciences,Shenyang 110016,China;
2.Department of Chemistry,Yunnan University,Kunming 650091,China;
3.Laboratory for Conservation and Utilization of Bio-Resources,Yunnan University,Kunming 650091,China)
Abstract:Influence of NH4 Cl on the initial atmospheric corrosion of zinc was investigated via quartz crystal microbalance(QCM)in laboratory at 80%RH and 25℃.The results show that NH4 Cl can accelerate the initial corrosion of zinc.Mass gain increase with the exposure time,but mass gain in the later doesn''t change obviously due to the formation of the insoluble simonkolleite on zinc surface in the presence of NH4 Cl.Fourier transform infrared spectroscopy(FTIR)and X-ray diffraction(XRD)was used to characterize the corrosion products.Zn5 Cl2(OH)s.H2 O,(NH4)2ZnCl4 and ZnO are the corrosion products on zinc.Brief discussion on the mechanisms of atmospheric corrosion of zinc in the presence of NH4 Cl was introduced.
Key words:atmospheric corrosion; zinc; NH4 Cl;
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