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

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