What is Chemical Conversion Coating

By Bester PCBA

Last Updated: 2023-10-16

What is Chemical Conversion Coating

Chemical conversion coating refers to a surface treatment process that creates a protective coating on various metals, including steel alloys, aluminum, beryllium, magnesium, and zinc. This process involves electrochemical or chemical reactions that result in the formation of a superficial layer on the metal surface, containing a metal compound.

The purpose is to provide cost-effective protection against corrosion. By creating a barrier between the metal substrate and the surrounding environment, it prevents direct contact with corrosive agents, thereby extending the lifespan of the metal and maintaining its structural integrity. They also offers a surface suitable for powder coating and painting. It provides adhesion for subsequent layers of paint or powder, ensuring a durable and long-lasting finish. This makes it particularly valuable in industries where aesthetics and durability are crucial, such as the PCB industry.

Chemical conversion coating preserves the electric conductivity of the metal substrate. Unlike non-conductive coatings like anodizing, chemical conversion coating allows for electrical conductivity, making it preferred in applications where electrical conductivity is required, such as in PCBs. Furthermore, it does not require electricity for the coating process, making it more cost-effective compared to anodizing. This absence of electricity also allows for greater flexibility in coating metal parts of various sizes and shapes.

Chemical conversion coating can be applied in different colors or can be clear, providing customization options and enhancing the aesthetics of the final product.

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