Black oxide, also known as " gun bluing," is one of the lowest tech coatings Anoplate applies, yet it is also one of the most popular. In fact, Anoplate has invested in a new black oxide line to help meet the demand.
The basic process, high temperature alkaline oxidation, has been around for nearly 70 years. It produces an attractive black finish that is very economical. The term black oxide refers to the oxidation of steel , stainless steel and other ferrous alloys. While copper alloys and aluminum can also be oxidized to achieve a black color, this article is limited to black oxides on steel and stainless steel.
Typical Uses of Black Oxide
- The biggest reason to use a black oxide coating is to reduce light glare. For example, on moving tools and machine parts safety is improved and eye fatigue reduced by using black oxide. Certainly, this is the reason nearly every gun manufacturer uses it and why many optical systems specify black oxide by name.
- While the coating by itself has limited corrosion resistance on steel parts, its ability to absorb sealants or rust-inhibiting preservatives makes black oxide an ideal, economical choice for a corrosion-resistant coating. Keep in mind however, that the protective value of black oxide is good only as long as the preservative is present. Consider: there's a good reason why the hunter oils his rifle down after each time it is used in the moist outdoors.
- The appealing look of black oxide also makes it desirable for wood stoves, tableware, model trains, fire pokers, and hand tools.
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