1 Passivation
It is a standard chemical finishing treatment used to improve the corrosion resistance of machined parts. The passivation process involves dipping the material in a chemical bath that removes iron from its surface, providing a smooth, shiny finish.
2 Chemical Conversion Coating
Also referred to as chromate coating, it is a CNC machining surface finishing that involves dipping a metal like zinc, cadmium, aluminum, or magnesium in chromic acid or other chromium solutions. This solution reacts with the metal surface to create a protective layer that enhances paint adhesion and provides electrical insulation and corrosion resistance.
3 Galvanizing
Galvanizing or zinc-coating is a surface treatment method that involves immersing a solid substrate such as steel in a molten zinc solution to coat it with different zinc-iron alloy and zinc metal layers. This cost-effective finishing treatment creates a protective layer on the surface of machined parts, preventing corrosion and rust.
4 Black Oxide Coating
This conversion coating process creates a magnetite layer on ferrous metals through a chemical reaction between the oxidizing salts in the black oxide solution and the iron on the surface of the metal. Black oxide coating finish provides a non-reflective and corrosion-resistant surface in architectural and consumer products.
5 Vapor Polishing
This precision surface finishing melts the surface of CNC plastic parts with chemical vapor to achieve a smooth, glossy finish. Manufacturers utilize vapor polishing techniques for thermoplastic materials such as PC and acrylic. It provides a high-gloss finish or optical clarity for applications like automotive lights and medical devices.