Application of silane coupling agent in conversion film field
Source:iotachem.com
PostTime:2023-06-09 14:18:32
Bare metal substrates are easily corroded under natural conditions, and coating a layer of paint on the surface of the metal substrate is the most common and easiest way to alleviate the corrosion of the metal substrate. However, due to the difference in chemical properties between the metal substrate and the coating, the bonding force between the metal substrate and the coating is very limited, and the coating is easy to fall off, which makes the metal substrate exposed to the corrosive environment again.
The conversion film process is commonly used in industry to increase the bonding force between the metal substrate and the coating. The conversion film process is simple to operate and stable in performance, such as the phosphating process (that is, the workpiece is soaked in the phosphating solution to form a layer of porous, uniform, dense phosphorus Phosphate film, the paint will penetrate into the pores of the phosphating film to increase the adhesion of the paint). However, widely used products on the market (phosphating, passivation, etc.) usually contain heavy metals, volatile acids, phosphorus and other polluting substances, and their use is increasingly restricted. As an environmentally friendly organic material, silane coupling agent has the ability to improve the bonding force between coatings and metal substrates. Environmentally friendly conversion coating products that use silane coupling agents to improve the bonding force between coatings and metal substrates have emerged as the times require.
