Application of Silane Coupling Agent in the Field of Conversion Coating

1. Features of silane coupling agent

Since the silane coupling agent has the properties of affinity for organics and inorganics at the same time, it can be used as an intermediary to connect these two types of materials with different chemical structure types and affinity. For example, the silane coupling agent SiSiB PC4100 can increase the combination of organic coatings and inorganic substrates such as metallic iron.

2. Application of silane coupling agent in the field of conversion coating

Bare metal substrates are easily corroded under natural conditions. Applying 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 different chemical properties of 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 again exposed to the corrosive environment.

Environmentally-friendly conversion film products that use silane coupling agent to improve the bond between coatings and metal substrates have emerged. Prior to this, the conversion coating process was commonly used in the industry to increase the bonding force between the metal substrate and the coating. The conversion coating process was simple in operation and stable in performance, such as the phosphating process.

Products that are widely used in 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 property of enhancing the bonding force of coatings and metal substrates with wide application.

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