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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.