Pick out the wrong statement about coating/electroplating of metals ?
Correct answer: D. Calorising is the process of coating steel with chromium
- A. Phosphate coating is used as an excellent base for paints & enamels
- B. Phosphate coating is less corrosion resistant than chromate coating
- C. The base metal to be electroplated is normally made the cathode of the electrolytic cell and
- D. Calorising is the process of coating steel with chromium
- E. coating metal is made the anode
Explanation
Calorising means coating steel or another metal with aluminium to improve oxidation resistance, not coating it with chromium. Phosphate coatings provide a good paint base, while electroplating normally uses the workpiece as cathode.
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