Elimination of oxides and burned calamine residues are very hard to clean. The difficulty to find: The choice of a product compatible with the substrate: it must not be aggressive for the metal. The installation of an adequate aqueous process (very high temperatures, long cycles, protection against subsequent corrosion of the treated part) The relevant pH selection of the product Rinse water management and drying quality. Those are the typical problems to solve for this type of application.
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