采用改变相对湿度、无机盐粒/金属组合和环境气氛等参数的方法研究了微液滴形成、生长的特征及其与大气腐蚀过程的关系.结果表明，微液滴形成 和生长与气氛中氧和相对湿度及盐粒/金属组合密切相关.在大气环境中，微液滴形成和生长需要两个前提条件：第一，环境相对湿度须高于盐粒水解液滴液面的饱和蒸气压；第二，水解液滴下的金属应能被液滴腐蚀.
he formation of the electrolyte droplet due to the deliquescence of soluble salt particles is one of the cause for the acceleration of atmospheric corrosion.A lot of micro-droplets,1 μm～10 μm in diameter,were observed around the edge of the main-droplet formed by the deliquescence of salt particles deposited on metal surface in atmosphere.In this paper,the characteristics of the formation and spreading of the micro-droplets were investigated in detail in a humidity-controlled chamber.The results showed that oxygen,relative humidity and a combination of salt particles and metals played important role in the formation of micro-droplets.Two premises were necessary for the formation of micro-droplets in atmosphere.First,the relative humidity should exceed the saturated relative humidity of the main-droplet.Another was that the metal substrate could be eroded under the main-droplet.
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