第三步(酸洗)：去除金属表面的自由离子、金属残渣、氧化物和其他腐蚀产物。
The Third Step (Acid Wash) is to remove free iron, metallic residues, oxides, and other corrosion products from the surface of the metal.
多年来是专业从事电镀、铝氧化作色、酸洗等金属表面处理，及印制各种产品标牌，不干胶。
Over the years a professional in electroplating, aluminum oxide upset, acid washing and other metal shows processing and printing products, placards and stickers.
金属表面的氧化物会造成深加工质量问题，用酸洗去除氧化物的传统方式存在污染环境、成本高等诸多弊端。
Oxides on metal surface will deteriorate quality of deep processing. Using acid pickling to remove oxides is a conventional method, but will pollute environment and increase operating cost etc.
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