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.
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 Papers
SAE Automotive Corrosion and Prevention Conference and Exposition ; 1993
1993-10-01
Conference paper
English
Five Year Outdoor Scab Corrosion Results on Zinc and Zinc Alloy Coated Sheet Steels
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