摘要
用石英晶体微天平（ＱＣＭ）为主要手段研究了Ｚｎ在相对湿度为９０％和ＳＯ_２含量为１０－６的条件下，ＮａＣｌ对Ｚｎ大气腐蚀初期（２０ｈ）动力学的影响结果表明：新鲜表面和在干燥器中放置１０ｄ的表面的Ｚｎ腐蚀均呈现近似线性规律。ＮａＣｌ的存在使得放置 １０ ｄ的 Ｚｎ的腐蚀开始阶段呈现一定程度的加速，而后产生抑制作用；对新鲜Ｚｎ表面在本实验研究时限内则促进了腐蚀．Ｚｎ表面存在一定量的氧化膜是 ＮａＣｌ对 Ｚｎ在 ＳＯ２环境条件下起缓蚀作用的重要条件，
A laboratory study of the effect of NaCI on initial atmospheric corrosion of Zinc under the condition of RH 90% and 10-6 SO2 was carried out by means of QCM (quartz crystal microbalance) and XRD. In the absence of NaCl, the corrosion of Zinc showed the approximate linear mass gain whether the surface of sample was fresh or not. Deposition of NaCl on the surface of zinc aged in desiccator for 10 days affected greatly the corrosion kinetic, the corrosion rate increased in some extent first, then decreased with time and finally reached the level less than that without NaCl. On the fresh surface of zinc, the existence of NaCl resulted in much enhancement of the corrosion rate at the beginning, and would not give general inhibiting effect in the experimental time scale. Therefore, it was concluded that the formation of surface oxide film is prerequisite for the inhibition of NaCl to the corrosion of zinc in the air containing SO2. Based on the experimental results of QCM and surface analysis, corresponding mechanism was discussed.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第3期272-274,共3页
Acta Metallurgica Sinica
基金
国家自然科学基金资助项目! 59899144
