大气中无机盐粒水解过程中的微液滴现象(英文)

Phenomenon of Micro-droplets Formation on Metals during the Deliquescence of Salt Particles in Atmosphere

采用改变相对湿度, 无机盐/金属组合, 测定微液滴体系的pH 值和电位分布等方法研究了微液滴形成和生长的特征. 结果表明, 微液滴的形成与大气腐蚀密切相关. 微液滴只在特定的盐粒/金属体系中出现, 微液滴区域具有较高的pH 值和较高的电位分布. 此外, 微液滴形成和生长需要两个前提条件:第一, 环境相对湿度应高于盐粒水解液滴液面的饱和蒸汽压;第二, 在水解液滴下的金属能被液滴腐蚀.

The characteristics of the formation of micro-droplets were investigated in a humidity-controlled chamber. The results showed that the micro-droplets formation had a close relation with the atmospheric corrosion of metal based on the pH and potential distributions of micro-droplets. Micro-droplets could only appear on high potential area in a corrosive combination of metals and salt particles. Meanwhile, a high value of pH was found in the areas covered with micro-droplets. The formation of micro-droplets needed two premises, one was that the relative humidity should be over the saturated relative humidity of main-droplet, the other was that the metal substrate could be eroded under the main-droplet.