Galvanizing, Zinc spinning (centrifugal removal of excess zinc)
Water quenching and passivation → Coating aging (stabilization)
Oxidation
Oxidation, also known as blackening or bluing, is a surface treatment process where a blue or black oxide film is formed on the workpiece surface by exposing it to air, water vapor, or chemical solutions at room temperature or heated to an appropriate temperature. This process aims to improve corrosion resistance and appearance.
In mechanical manufacturing, blackening is commonly performed by heating workpieces in a NaOH solution. Compared to zinc or chromium plating, this method offers lower cost with satisfactory results.
The black oxide film formed has a thickness of 0.5–1.5 μm and provides lower corrosion resistance compared to other chemical conversion coatings.
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