Why does the end face of aluminum coil have grease spots
RobertPar > 01-14-2020, 01:51 AM
Why does the end face of aluminum coil have grease spots?Process one without coolant to see whether there are spots. There is a layer of alumina membrane on the blank face of aluminum coil, which will react with basic coolant when heating through processing.The reason may be that the manufacturer hasn’t cleaned. Before being coated, the aluminum should be cleaned carefully. Otherwise the paint will peel off.Other related question