The application of Fluorosilane coupling agent in metal anticorrosion pretreatment is a new application of silane. In the 1990s, this technology was also studied abroad, but so far it has not been industrialized on a large scale. Since the Fluorosilane coupling agent can form a trihydrocarbyl silanol after hydrolysis, the alcohol hydroxyl groups can react with each other to form a cross-linked dense network hydrophobic film, because the surface of this film has organic functional groups that can react with the resin. , So the adhesion to the paint film will be greatly improved, and the ability to resist corrosion, friction and impact will also be improved. At the same time, since the silane film itself is hydrophobic, it has a certain anti-corrosion effect, which is proportional to the density of the film.
By comparing the effect of phosphating coating to demonstrate its superiority, such as the treatment of different metal substrates with silane system and iron salt phosphating, zinc salt phosphating and chromate treatment, it is found that the outstanding characteristics of Fluorosilane coupling agent treatment Yes:
a. The anti-corrosion effect can be achieved without painting;
b. Compared with the phosphating process, the process is simple, no waste water containing heavy metals will be produced, and the environment is good;
c. Improve the adhesion of the paint film on the substrate through the micro/molecular bridge.
Fluorosilane coupling agent In many fields, silane treatment shows comparable or better anticorrosion effect than existing technology. These characteristics have broad application prospects and development prospects especially in the automobile and motorcycle parts industry and in the field of vehicle and machinery manufacturing.
As a kind of silicon compound with unique structure, Fluorosilane coupling agent builds a bridge between inorganic and organic matter, and improves the defects of many materials. The development of silane agent in metal surface anticorrosion technology has initially formed a direction, and its advantages are obvious.
Phosphating and passivation processes are widely used in typical metal material coating at present. Although the process is mature, the waste discharge and treatment cost is high. With the gradual improvement of environmental protection requirements and the enhancement of environmental awareness, especially the great reduction of the allowable emission of chromium in various countries, it has been prompted to consider replacing the old phosphating and passivation processes with other processes and chemical treatment reagents. The use of Fluorosilane coupling agent in metal anticorrosion and surface pretreatment of metal materials can indeed produce encouraging results, and it is now becoming an emerging field of application of Fluorosilane coupling agent. Because of its characteristics of zero pollution, good corrosion resistance of the treated parts, and firm combination with the coating, if it can be industrialized to replace the serious pollution of phosphating and passivation pretreatment processes, it will have a profound impact on the metal material processing industry.
