With the increasingly high requirements for anti-corrosion ability and coating effect in metallurgy, construction, automobile, home appliances and other industries, the high-speed development of color coated coil industry and continuous hot-dip galvanizing industry of steel strip in China is promoted, especially the color coated coil manufacturing process saves degreasing (pickling, alkali washing, washing), film-forming (phosphating, passivation, washing) and coating (primer, baking The operation and working time of finish paint) can save the pretreatment cost, coating cost, pretreatment equipment and coating equipment cost, workshop investment cost, etc., improve the processing environment and labor conditions of workers. It is widely welcomed by many manufacturing industries and further promotes the rapid development of color coating industry.
Due to the great difference between the continuous hot galvanizing process and the color coated coil manufacturing process and the traditional process of first processing and then coating, the degreaser, the conversion solution and the passivator used have special functions and their own characteristics. In this paper, the pretreatment of the continuous hot galvanizing process and the color coated coil and the functions and characteristics of the special treatment agent used, namely the strip treatment agent, are introduced.
In order to remove the oil, rust and dust on the surface of the base plate used for continuous hot galvanizing and color coating of steel strip, and form a good base suitable for continuous hot galvanizing and coating of steel strip, so as to ensure that the hot galvanizing plate and color coating have good corrosion resistance and adhesion, chemical treatment must be carried out before hot galvanizing or coating materials. We call the chemical treatment agent used in the continuous hot-dip galvanizing and color coating process of steel strip as the special treatment agent for strip, which is called strip treatment agent for short. It includes strip degreaser, strip conversion liquid and strip passivator.