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The Effect of Chromium and Chromium-Free Post-Phosphating Rinses on the Corrosion Performance of Zinc and Zinc Alloy Coated Sheet Steels After Five Years Outdoor Scab Corrosion Exposure
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Abstract
A selection of commercially available chromium and chromium-free post phosphate rinses along with a deionized water rinse were evaluated over several zinc and zinc-alloy coated sheet steels. The test specimens were pretreated and electrocoated on-line in an automotive assembly plant. The effect of the rinse treatments on the cosmetic corrosion performance of the substrates, after 5 years of exposure in an outdoor scab corrosion test was determined. After this exposure none of the rinse treatments had performed better than deionized water rinse on zinc and zinc-iron coated sheet. The zinc-nickel coating showed improved scribe creepage when treated with the Cr+6/Cr+3 rinse. Data is provided comparing the concentration of the treatments used vs scribe creepage and chipping corrosion paint loss.
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Citation
Hess, J. and Davidson, D., "The Effect of Chromium and Chromium-Free Post-Phosphating Rinses on the Corrosion Performance of Zinc and Zinc Alloy Coated Sheet Steels After Five Years Outdoor Scab Corrosion Exposure," SAE Technical Paper 932358, 1993, https://doi.org/10.4271/932358.Also In
References
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- Machu, W. Die Phosphatierung Verlag Chemie 1952
- Davis, J.W. “Automotive Test Procedures - Corrosion versus Adhesion Properties of Painted Metal Substrates” SAE Paper No. 850235
- Petschel, M. “The Comparative Performance of a Non-Chromium Post-Treatment Evaluated by Accelerated Corrosion Tests on Automotive Sheet Steels” SAE Paper No. 892558
- Hess, J.C. Soreide, L.E. “The Effect of Phosphate Chemistry and Rinsing Conditions on the Corrosion Resistance and the Paint Adhesion of Zinc and Zinc Coated and Cold Rolled Sheet Steels” SAE Paper No 892557 1989
- Chrysler Corporation Scientific Labs and Proving Grounds Laboratory Procedure No. LP-463PB-52-01 “Chipping Corrosion Testing”