HOT BLACKENING SALT( VCFERROUS) What is VCFERROUS Hot Blackening Salt? 1. Definition: - VCFERROUS: A proprietary blend of chemicals specifically formulated for use in hot black oxide processes. It’s designed to produce a uniform, durable black finish on ferrous metals. - Black Oxide Coating: This is a conversion coating that transforms the surface layer of metal into a magnetite (Fe3O4) layer, providing both aesthetic and functional benefits. 2. Composition: - Alkaline Salts: VCFERROUS typically contains a mixture of sodium hydroxide (NaOH) and sodium nitrate (NaNO3), which are essential for the oxidation process. - Nitrate/Nitrite Salts: Sodium nitrite (NaNO2) or other nitrates are often included to facilitate the formation of the black oxide layer at high temperatures. 3. Temperature Range: - The hot blackening process with VCFERROUS operates at high temperatures, usually around 285-300°F (140-150°C). Maintaining this temperature is crucial for effective coating.