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A lot of precision machined parts have a black oxide finish. Some of these parts are used in light-sensitive environments like X-ray machines, while others require abrasion-resistant surfaces. You could find these parts in electrical equipment and hardware, such as wire strippers, gears for timers, cutters, and many other industrial tools. You also see them in automotive and aerospace components including suspension bushings, brake valve components, and engine components. Finally, the military uses them in a variety of applications including turrets and gun shell magazines.
Whether you choose this surface finish for your aluminum parts depends on where you intend to use them and how long you plan on using them. The environment could impact the durability of the part since some metals with this finish are prone to rust when exposed to a continuous high level of heat.
You may want to consider anodizing your aluminum parts instead of a black oxide coating to ensure that the finished product is suitable for your needs. Anodizing produces a thicker oxide layer that offers more corrosion resistance and durability than black oxide.
You can find a DIY black anodizing kit that you can use in your shop to perform aluminum anodizing and then dye the parts with organic or inorganic colors. This process is more cost-effective than outsourcing your anodizing and gives you more control over the color of your finished products. However, you should keep in mind that black anodizing isn’t as durable as black oxide and will wear off faster in high-temperature conditions.
