Freshly blackened parts The same part overnight The same parts after a week. It’s no secret that blackened steel is one of the most sophisticated trends in metal fabrication today. gst) Traditional Midnight Black Patina reacts on aluminum, bronze, brass, copper, iron, steel (not stainless), and zinc/galvanized. We are now drying each part with compressed air between each stage, but finding similar issues. Black Magic Patina creates a beautiful, rich black patina on iron and steel. Using a cleaning solution on the parts Rinse in Distilled water Soak in Black Oxide Concentrate, currently mixing 8 to 1 with Distilled Water Rinse in Distilled Water Soak in oil We weren’t originally drying the part between each stage, except when we went from cleaning solution to initial rinse. After analyzing their process, we concluded that using compressed air for drying the parts may lead to rusting. One of our customers shared their experience/process with us. Use running water to rinse the parts for 1-2 minutes Do not dry the parts between prepping, cleaning, and blackening Do not use compressed air to dry the parts as it contains water droplets Apply E-Tec ( see instructions) sealer to extend the life of the finish and protect the surface. 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. The patina solution comes concentrated and is then diluted from 1 part distilled water to 1 part Birchwood Technologies to 3 parts of distilled water to 1 part Birchwood Technologies. There are separate formulas for iron, steel and aluminum. Mid-temperature black oxide (225–245 F°) is the latest development in blackening processes, producing a true black oxide iron magnetite (Fe3O4) finish. For bronze, brass and copper there are choices of brown or black applied by spray, brush or immersion. 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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