Powder-coated, electro-coated and painted surfaces that meet and exceed wear resistance and corrosion protection owe their success to adequate surface preparation. Sufficient cleaning before applying a top coating, such as phosphates (iron, manganese, zinc), zirconium and chromates, is critical.
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Excerpt: Spray cleaners combine chemical and mechanical action to remove soils from the substrate. The cleaning action must be rapid, as contact times in most spray machines typically range from 30-60 seconds, at temperatures below traditional soak cleaners.