摘要
目的研究NaCl,(NH4)2SO4,Na2SO4和NH4Cl的潮解性能及其沉积铝的大气腐蚀行为,揭示盐的潮解性对铝腐蚀的影响规律.方法在温度25℃±1℃,相对湿度80%±2%的净化空气中,采用石英晶体微天平(QCM)在镀金的石英晶片上研究了NaCl,(NH4)2SO4,Na2SO4和NH4Cl的潮解性.在温度25℃±1℃,相对湿度80%±2%的净化空气和含SO2的气氛中,用石英晶体微天平(QCM)研究了盐沉积后铝的腐蚀行为,通过扫描电子显微镜、X射线能谱仪、傅立叶红外光谱手段进行表征.结果发现NH4Cl的潮解性能最强,其后依次为(NH4)2SO4,NaCl,Na2SO4.铝在含SO2的气氛中的腐蚀比在净化空气中严重,并且经NH4Cl沉积的铝腐蚀最为严重,接着依次为(NH4)2SO4,NaCl,Na2SO4.盐沉积后,铝在盐沉积区开始腐蚀,然后扩展到其他区域.结论经盐沉积后铝腐蚀的程度与盐的潮解性能有关,潮解性能越大,腐蚀越严重.对腐蚀产物结构的测定,在含SO2的气氛中铝的腐蚀产物主要是由硫酸盐组成,因而其腐蚀较为严重.
It is discussed that the influence of salt deliquescent on the aluminum corrosion. The deliquescent behaviors of NaCl, （NH4 ）2SO4 ,Na2SO4 and NH4 Cl were studied on the surface of plated gold in situ with quartz crystal microbalance （QCM） in the cleaned atmosphere at 25 ± 1 ℃ and 80% ± 2% relative humidity（RH）. Then, the atmospheric corrosion of plated aluminum on the surface of quartz crystal wafer and deposited with the salts such as NaCl, （ NH4 ）2 SO4, Na2 SO4 and NH4 Cl were investigated in situ with QCM at 25 ± 1 ℃ and 80% ±2% RH in different atmospheres （ cleaned and SO2-containing） by using of SEM, EDS and Fourier transformation IR Spectrometer. The results showed that the hygroscopy of NH4Cl was the greatest, followed by （ NH4 ） 2SO4, NaCl, Na2SO4. The corrosion of plated aluminum in SO2-containing atmos-phere was greater than that in the cleaned atmosphere, and deposited aluminum with NH4Cl was corroded most seriously, followed by （ NH4 ）2SO4, NaCl, Na2SO4. The corrosion of plated aluminum initiated along with were deposition area of different salt particles. The corrosion rates of aluminum deposited with different salts were related to the hygroscopy of them, and the more deliquescent salt is, the more serious corrosion. The corrosion products of aluminum exposed in the SO2-containing atmosphere are mainly of sulfates, and is therefore it is more serious corrosion in this environment.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2009年第4期722-727,共6页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(50499336)
