镀锌板的发展

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镀锌钢板广泛应用于轻工、家电、汽车、建筑等行业。长期以来，镀锌板在我国一直是一种短期产品。多年来，我国镀锌板自给率在50%左右，每年都需要大量进口。近年来，带钢热镀锌技术的发展和趋势主要集中在汽车板、热轧带钢热镀锌和高耐蚀热镀锌三个方面。高表面质量是汽车覆盖件的基本要求。涂层的表面质量直接关系到带钢的表面粗糙度、清洁度、化学成分和冲压性能。同时，热浸镀工艺、锌液组成和热浸镀设备也是影响镀锌层表面质量的重要因素。锌渣是影响镀锌板表面质量的重要因素。在现代生产线上，采用陶瓷内衬锅代替铁锌锅，有效地降低了锌渣对镀锌板表面质量的影响。此外，漂亮的锌花也是传统热镀锌板的一个典型特点，深受用户青睐，具有一定的商业价值。但研究表明，锌花表面的不均匀性和镀层中的铅含量会影响镀层的后续加工性能、镀层性能和耐蚀性。随着铅含量的降低，锌花尺寸减小，开裂率和腐蚀率显著降低。目前，新建的镀锌生产线均采用无铅镀锌工艺，无铅镀锌已成为当前热镀锌的发展趋势。

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