Zn在SO2环境下大气腐蚀初期表面特性研究

采用扫描电镜（ＳＥＭ／ＥＤＡＸ）和显微红外光谱对Ｚｎ在相对湿度为９０％和０．９×１０＾－６ＳＯ２的控制气氛条件下初期腐蚀表面和腐蚀产物进行了研究，１０ｈ以后腐蚀表面呈现均匀分布的凹凸形貌特征，直到数日后开始萌生局部腐蚀，测试结果表明局部腐蚀的产物碱式水合硫酸盐。

LABORATORY INVESTIGATION OF THE INITIALLY CORRODED ZINC SURFACES IN AIR CONTAINING SO2

Laboratory expxure of zinc was carried out under the condition of 0.9 x 902 and 90% relative humidity in order to investigate the characteristics of ded surface and its role in initial stage. Scanning electmn microscope (SIN/EDAX), IR microscope were used for the characterisation of ded surfaces. It was found that wer 10 h exposure resulted in a rather uniformly d l ncduls like mrphology with size about I-, which was not kept until local cornion sprouted wer a week mure. The cornion product on locally coded area with porous appearance, was mnposed of needle-shaped crystals. Based on the IR and EDAX, it was infered that the product was Z&Q(OH)6 .5H20. The mechanism of atnmpheric cornion for zinc under the condition is discussed.