- Author
- Martin, J. W. | Embree, E. | Tsao, W.
- Title
- Non-Osmotic, Defect-Controlled Cathodic Disbondment of a Coating From a Steel Substrate.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Journal
- Journal of Coatings Technology, Vol. 62, No. 790, 25-33, 1990
- Keywords
- coatings | steel substrates | blister initiation | blister growth | temporal variability
- Abstract
- A non-osmotic, defect-controlled cathodic disbondment model for coating failure is proposed for explaining experimental results which were inconsistent with an osmotically-controlled disbondment process. The proposed model attempts to integrate the physics of blister initiation and growth (that is, the development of internal stresses and the fracture of the coating from the substrate) with the better elucidated chemistry of blister growth. The proposed model has many features which are analogous to the buckling and stress corrosion cracking models proposed for other materials. It also provides an alternative explanation for the well-known barrier effect in coatings.