GB/T 18178-2000 General Principles for the Selection of Water-based paints painting systems on steel parts sets out the basic principles for the selection of water-based paints painting systems on steel parts. This standard applies to the painting of steel parts and aims to provide guidance for the coating process to ensure that the selected painting system has good performance in practical applications. The standard details the relevant reference standards, including the determination of paint film flexibility, impact resistance, water resistance, chemical resistance and neutral salt spray performance. These methods provide the basis for the evaluation of painting mass. In addition, the standard also covers technical requirements such as painting pretreatment, painting operation safety regulations and phosphating, providing a comprehensive reference for painting projects.