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Technical Paper

Combined Corrosion/Weathering Testing of Coated Steel Products for Automotive Applications

1991-10-01
912280
An accelerated test method comprising wet/dry corrosion cycling using a 0.05 wt% NaCI/0.35 wt% [NH4]2SO4 electrolyte alternating with exposures in a UV-condensation chamber using UVA-340 fluorescent bulbs has recently been developed primarily for assessing Industrial maintenance paint performance. In the present work, this method has been applied to a series of 10 coated sheet steel materials intended for automotive applications; the same materials under test in a joint AISI/SAE study. The results indicate that the test weathering component caused little degradation to the automotive paint. Paint creepback from scribe lines on phosphate/cold-rolled steel materials was accelerated by factors ranging between 5 - 7.6 when compared with 2 year field data obtained by the AISI/SAE.
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