Room-temperature blackening processes are autocatalytic reactions of a black selenium-copper compound that deposits on ferrous parts through an immersion process.Ĭustomers reach out to us asking how to prevent their freshly blackened parts from rusting. It is important to note this is not a true black oxide process however, it may be referred to as room-temperature black oxide. Room-temperature blackening (65–85° F) is the preferred metal-blackening process for safe and convenient in-house blackening. It is an excellent non-bleed black finish for powdered metal and cast iron. It produces super deep blackness and corrosion resistance equal to hot oxide blackeners. It produces no caustic boiling fumes and provides a safer working environment. Mid-temperature black oxide (225–245 F°) is the latest development in blackening processes, producing a true black oxide iron magnetite (Fe3O4) finish. It is a premium-grade salt mixture which will blacken a wider range of steel alloys than any other process on the market. Hot black oxide (285 F°) is a conventional hot process which produces a true black oxide iron magnetite (Fe3O4) finish. EPi was the first company to offer all three processes. There are three types of metal blackening: hot, mid, and room temperature blackening. Black oxide is a blend of caustic, oxidizers, and additives that is used on ferrous metals.
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