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.
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