A critical crevice solution and IR drop crevice corrosion model
- 作者：Glyn F. Kennell ; Richard W. Evitts ; Kevin L. Heppner
- 关键词：A. Stainless steel ; B. Polarization ; B. Modelling studies ; C. Crevice corrosion
- 刊名：Corrosion Science
- 出版年：2008
- 期刊代码：28_0010938x
- 类别：ch
- 出版时间：June 2008
- 卷：50
- 期：6
- 页码：1716-1725
- 文件大小：439 K
摘要
This paper presents a mechanistic model describing the dynamic concentration profiles and corrosion currents within a corroding crevice. The model couples anodic areas within the crevice with cathodic areas on the bold surface. It also incorporates the combined effects of the chemical attack of the crevice solution along with the electric potential changes in the crevice and over the bold surface. The mathematical model is used to predict the dynamic crevice pH profile and remarkable agreement with experimental data is evident. Three crevice corrosion phases were determined that correspond to the evolution of the electric potential drop within the crevice.