Abstract
Commercial chromate-passivated galvanized steel sheet specimens from five batches with different combinations of base metal thickness, zinc coating weight and zinc crystal size were subjected to heating at 80 °C for 100 h, immersion in distilled water for 24 h or exposure outdoors for 34 days. Changes in surface chemistry were assessed using X-ray photoelectron spectroscopy. The heating produced no discernible changes in chemistry, but the immersion and outdoor exposure specimens suffered marked loss of chromium from the passivating layer, and spectra indicated that zinc corrosion products were developing.
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