Galvanized steel sheet is widely used in light industry, household appliances, automobile and construction industry. For a long time, galvanized sheet in China has been a short-term product. For many years, the self-sufficiency rate of galvanized sheet in China is about 50%, and a large number of imports are needed every year. In recent years, the development and trend of strip galvanizing technology are mainly concentrated in three aspects: automobile plate, hot-rolled strip hot-dip galvanizing and high corrosion-resistant hot-dip galvanizing plate. High surface quality is the basic requirement of automobile panel. The surface quality of the coating is directly related to the surface roughness, cleanliness, chemical composition and stamping performance of the strip steel. At the same time, the Hot-Dip Process, the composition of zinc solution and the hot-dip equipment are also important factors affecting the surface quality of zinc coating. Zinc slag is an important factor affecting the surface quality of galvanized sheet. In modern production line, ceramic lined pot is used instead of iron zinc pot, which effectively reduces the influence of zinc slag on the surface quality of galvanized sheet. In addition, beautiful zinc flower is also a typical feature of traditional hot-dip galvanized sheet, which is favored by users and has certain commercial value. However, the research shows that the inhomogeneity of zinc flower surface and the lead content in the coating will affect the processing performance, coating performance and corrosion resistance of the coating plate in the subsequent processing. With the decrease of lead content, the size of zinc flower decreased, the cracking rate and corrosion rate decreased significantly. At present, all new galvanizing production lines adopt lead-free galvanizing process, and lead-free galvanizing has become the development trend of current hot galvanizing.
Rust prevention treatment of iron and steel is generally divided into three methods and requirements: intermediate rust prevention, process rust prevention and final rust prevention. Generally, water-based rust prevention, dehydration rust prevention and other rust prevention methods are used in the process of rust prevention. The rust prevention time is short, which can meet the requirements of rust prevention in the process. Processing antirust treatment includes passivation antirust, phosphating antirust, dehydration antirust oil, etc. According to different process requirements. The final antirust treatment is mainly oil-based antirust. Because the antirust grease is not easy to volatilize, the antirust time is longer. The development of antirust technology for iron and steel in China is still in its infancy. People lack of rust prevention awareness or methods. The antirust technology and products used are still some traditional concepts. With the rapid development of China's industrial technology, the problem of rust prevention has gradually become a concern. Phosphating products, passivation products, blackening products, water-based antirust agents, dehydration antirust agents, durable antirust agents, cutting antirust agents and other products. Scope of application: applicable to dehydration rust, inter process rust, process rust and long-term storage rust of various metals or equipment after mechanical processing, grinding, heat treatment, electrochemical processing, blackening and bluing treatment and water-based cleaning. Cleaning series products cleaning agent series mainly includes three kinds of products: strong general cleaning agent