Birchwood’s Presto Black Ensures Corrosion Resistance

The coating is recommended for finishing hot rolled steels, alloy steels, tool steels, as well as cast iron, forged steels and powdered metal.

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Birchwood Technology’s Presto Black room temperature black oxide is designed for small- to medium-production operations that require robust corrosion resistance and galling protection on critical surfaces for machine components.

The Presto Black process produces a non-dimensional coating thickness of less than 0.5 micron thickness and is designed for components that require a black finish for visual appeal and rust protection. Presto Black is a fifteen-minute process that eliminates the hazards of the hot oxide process by operating at room temperature. It provides high corrosion resistance and is tested for up to 800 hours humidity exposure when sealed with an appropriate rust preventive, Birchwood says.

The Presto Black process provides a friable crystal structure that serves as a barrier on sliding surfaces to protect the underlying steel from galling and deformation. The coating is recommended for finishing hot rolled steels, alloy steels, tool steels, as well as cast iron, forged steels and powdered metal.