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The Effect of Phosphate Chemistry and Rinsing Conditions on the Corrosion Resistance and the Paint Adhesion of Zinc Coated and Cold Rolled Sheet Steels
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English
Abstract
A representative selection of commercially available zinc phosphate pretreatments were evaluated over four sheet metal substrates. The intent of the study was to compare cosmetic corrosion resistance and paint adhesion performance of the various sheet metal/phosphate combinations under present cathodic electrocoat and topcoat systems. While laboratory applied pretreatments were used, an attempt was made to duplicate deficient conditions on some specimens by eliminating rinse conditioner and/or chromium rinse. Panels were tested using the High Temperature Chipping Corrosion and Accelerated Outdoor Corrosion cycles. The resulting creepback from scribe and paint loss data were analyzed and used to draw conclusions regarding relative performances of rinse conditions, phosphates and substrates.
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Authors
Citation
Hess, J. and Soreide, L., "The Effect of Phosphate Chemistry and Rinsing Conditions on the Corrosion Resistance and the Paint Adhesion of Zinc Coated and Cold Rolled Sheet Steels," SAE Technical Paper 892557, 1989, https://doi.org/10.4271/892557.Also In
References
- Petrey, L.D. Shaffer, R.J. Berndt, T. Macciocco, J. “The Effect of Automotive Plant Painting Operations on the Paint Adhesion and Cosmetic Corrosion Resistance of Precoated Steels” Galvatech September 1989
- Chrysler Corporation, Engineering and Research Office Laboratory Procedure No. LP-463PB-52-01 “Chipping Corrosion Testing”
- Davidson, D.D. Stephens, M.L. Soreide, L.E. Shaffer, R.J. “Methods of Characterizing Phosphate Coatings on Automotive Sheet Steels” SAE Paper # 862006 1986
- Davidson, D.D. Soreide, L.E. Stephens, M.L. “Evaluation of the Cosmetic Corrosion Resistance of Zinc Coated Sheet Steels -Using the Chrysler Chipping Corrosion Test and Long Term Outdoor Exposure Testing” Galvatech September 1989
- Davidson, D.D. Soreide, L.E. Stephens, M.L. “Assessment of the Chrysler Chipping Corrosion Test Using Laboratory and Long Term Outdoor Exposure Testing” Galvatech September 1989