物理化学学报 >> 2005, Vol. 21 >> Issue (09): 993-996.doi: 10.3866/PKU.WHXB20050910

研究论文 上一篇    下一篇

大气中无机盐粒水解过程中的微液滴现象

张际标; 王佳; 王燕华   

  1. 中国科学院海洋研究所, 山东 青岛 266071； 中国科学院研究生院, 北京 100049； 湛江海洋大学, 广东 湛江 524088； 中国海洋大学, 山东 青岛 266003； 中国科学院金属腐蚀与防护国家重点实验室, 沈阳 110016
  • 收稿日期:2005-01-13 修回日期:2005-03-15 发布日期:2005-09-15
  • 通讯作者: 王佳 E-mail:jwang@mail.ouc.edu.cn

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 E-mail:jwang@mail.ouc.edu.cn

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摘要： 采用改变相对湿度, 无机盐/金属组合, 测定微液滴体系的pH值和电位分布等方法研究了微液滴形成和生长的特征. 结果表明, 微液滴的形成与大气腐蚀密切相关. 微液滴只在特定的盐粒/金属体系中出现, 微液滴区域具有较高的pH值和较高的电位分布. 此外, 微液滴形成和生长需要两个前提条件：第一, 环境相对湿度应高于盐粒水解液滴液面的饱和蒸汽压；第二, 在水解液滴下的金属能被液滴腐蚀.

关键词: 微液滴, 相对湿度, 电位分布, 大气腐蚀

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