Metal immersion plating technology was born in the early 1950s. 1952, Erwim Gemmer of backpackage Griesheim Company, a subsidiary of German Herst Company, invented the fluidized bed plastic impregnation process. Using fluidized powder plastic, a mailing film is formed on the metal surface, so that steel-plastic composite products with excellent decoration, corrosion resistance and insulation can be obtained. The coating material used at that time was polyethylene. During the period of 1957, a Japanese chamber of commerce imported plastic dipping equipment from Crisheim company of the Federal Republic of Germany, and made great progress after improvement. In our country, the research of plastic dipping is later than electrostatic spraying. In the early 1960s, the fluidized bed coating of thermosetting epoxy powder was studied and achieved success. The application field is limited to the insulation box anticorrosion of mechanical and electrical products. During the period of 1987, the Ministry of Metallurgy sent personnel to Japan to inspect and carry out a large-scale automatic plastic dipping production line. Based on this dipping line, Zhengzhou Metal Plastic Painting Research Institute, a domestic research center, has accumulated rich experience through continuous learning and improvement, and the quality of polyethylene powder coatings for later dipping is close to international standards. In the later stage, liquid impregnation was developed, but it was only 10 years after its successful trial production in China, and it just began to expand its application scope, belonging to a new decorative material.