由于技术的进步和社会的发展，用户对产品质量的要求也越来越高。外观是产品的第一印象，外现质量的基础是涂装前处理。近年来，国内不少汽车行业率先花巨资引进国外先进的涂装前处理生产线和生产工艺。国内工程机械行业受资金、生产规模、技术、专业人员等因素制约，产品的外 Due to technological progress and social development, the user’s requirements for product quality are also getting higher and higher. Appearance is the product of the first impression, the external quality is based on pre-coating treatment. In recent years, many domestic auto industry took the lead in heavily invested to introduce advanced foreign pre-painting production line and production technology. Domestic construction machinery industry by the capital, production scale, technology, professionals and other factors, the product of the