4. Electrolytic chromium plating of black iron
Chromium-plated iron differs from tinplate in that the tin layer is replaced by a thin layer of metallic chromium (approx. 0.01 µm or 70 mg chromium on a 1 m 2 face) topped by a layer of partially hydrated chromium (III) oxide (approx. 15 mg chromium on a 1 m 2 face), both formed by electrolysis.
Deposition takes place in a conventional dilute chromium plating bath [50 to 200 g/L chromium trioxide (CrO 3 chromic anhydride)] catalyzed by sulfuric acid (mass ratio H 2 SO 4 /CrO 3 = 1/100) and/or complex fluorides. The higher the density and the lower the bath temperature, the higher the current...
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Electrolytic chromium plating of black iron
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