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中文摘要：
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。
英文摘要：
Under the cyclic wet-dry conditions of 50% RH and 90% RH at 25 ℃, the spreading behaviors of micro-droplets were investigated in situ with the stereomicroscope with and without the electrochemical polarization. The results indicated that there was an 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 followed a reverse spreading changing rule. with the increase of the wet-dry cycles and the corresponding maximum of Rp Under cyclic wet-dry conditions, it showed a closed relation between the of micro-droplets and corrosion current. They were influenced and promoted with each other.
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