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| MICRO-DROPLETS PHENOMENON AND ATMOSPHERIC CORROSION—— Ⅲ. Spreading behaviors of micro-droplets under cyclic wet-dry conditions |
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| 广东海洋大学海洋资源与环境监测中心 |
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Abstract 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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Received: 26 September 2006
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