abcd DONGGUAN JOINSHOW PRECISION HARDWARE MANUFACTURING CO.，LTD Introduction to Powder Coating粉末涂料介绍abcd DONGGUAN JOINSHOW PRECISION HARDWARE MANUFACTURING CO.，LTD Metal Pretreatment for use withPowder Coatings金属前处理abcd DONGGUAN JOINSHOW PRECISION HARDWARE MANUFACTURING CO.，LTD Metal Preparation金属的处理Pretreatment is a process intended to prevent the corrosion of the painted metal.前处理是一种提高耐腐蚀的工艺Fe2 + O2 + H2O= RUSTIron reacts with oxygen and water in the atmosphere creating a powdery brown mess, n
