采用在线显微技术考察了２５℃、相对湿度５０％和９０％的干湿交替作用下，有无外部极化时微液滴的形成和扩展规律。结果表明，没有施加外部极化，干湿循环次数对微液滴的形成和扩展影响不大。在极化状态下，随着干湿循环的进行，微液滴覆盖区交替收缩和扩张，极化电流和极化电阻发生脉冲性变化，极大极化电流随干湿交替次数的增加而递增，极大极化电阻则随干湿交替的进行而减小。在干湿交替作用下，微液滴的扩展与腐蚀电流之间相互影响、相互促进。
In this paper, the spreading behaviors of micro-droplets with and without the electrochemical polarization were investigated under the cyclic wet-dry conditions of 50% RH and 90% RH at 25℃. The results indicated that there was unobvious influence of the wet-dry cycles on the formation and spreading of micro-droplets in a condition without the electrochemical polarization. Under the external polarization, with the advance of the wet-dry cycles, the areas covered with micro-droplets alternately expanded and dwindled, and the polarization current Ip and polarization resistance Rp changed impulsively. The maximum of Ip in each cycle increased gradually with the increase of the wet-dry cycles and the corresponding maximum of Rp followed a reverse changing rule. Under cyclic wet-dry conditions, it showed a closed relation between the spreading of micro-droplets and corrosion current. They were influenced and promoted with each other.
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