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The Pretreatment of Steel and Galvanized Steel for Cathodic Electrodeposition Paint Systems
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Abstract
The advent of cathodic electrodeposition in the automotive industry has brought about substantial changes in the pretreatment of steel and galvanized steel surfaces and the testing thereof. Cyclic scab blistering tests, water soak tests, coating solubility, coating porosity and ESCA/SEM/Auger surface analysis techniques have provided significant insights into the factors that optimize the performance of zinc phosphate coatings for cationic paint systems. Specifically, the crystal structure and iron content of the phosphate coating and a chromium based post-rinse have been shown to make a significant effect upon the subsequent corrosion resistance properties of the phosphate/metal/CED paint system. Further, ESCA/SEM surface analysis and accelerated testing have shown that the processing method substantially affects both the crystal structure and composition of the coating.
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Citation
Davis, J., "The Pretreatment of Steel and Galvanized Steel for Cathodic Electrodeposition Paint Systems," SAE Technical Paper 820336, 1982, https://doi.org/10.4271/820336.Also In
References
- Wiggle R.R. Smith A.G. Petrocelli J.V. “Paint Adhesion Failure Mechanisms On Steel in Corrosive Environments” Journal Paint Technology 40 174 1968
- Kojima R. Okita H. Matsushima Y. “Fundamental Characteristics of Zinc Phosphate Coating” Iron and Steel 66 156 1980
- Funke W. Haagen H. “Emperical or Scientific Approach to Evaluate the Corrosion Protection Performance of Organic Coatings” Ind. Eng. Chem. Prod. Res. Dev. 17 1 50 1978