Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (09): 993-996.doi: 10.3866/PKU.WHXB20050910

• ARTICLE • Previous Articles     Next Articles

Phenomenon of Micro-droplets Formation on Metals during the Deliquescence of Salt Particles in Atmosphere

ZHANG Ji-biao; WANG Jia; WANG Yan-hua   

  1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071; 2Graduate School of the Chinese Academy of Sciences, Beijing 100049; Zhanjiang Ocean University, Zhanjiang 524088; Ocean University of China, Qingdao 266003; State Key Laboratory for Corrosion and Protection of Metals, Chinese Academy of Sciences, Shenyang 110016
  • Received:2005-01-13 Revised:2005-03-15 Published:2005-09-15
  • Contact: WANG Jia

Abstract: The characteristics of the formation of micro-droplets were investigated in a humidity-controlled chamber. The results showed that the micro-droplets formation had a close relation with the atmospheric corrosion of metal based on the pH and potential distributions of micro-droplets. Micro-droplets could only appear on high potential area in a corrosive combination of metals and salt particles. Meanwhile, a high value of pH was found in the areas covered with micro-droplets. The formation of micro-droplets needed two premises, one was that the relative humidity should be over the saturated relative humidity of main-droplet, the other was that the metal substrate could be eroded under the main-droplet.

Key words: Micro-droplets, Relative humidity, Potential distribution, Atmospheric corrosion