Pick out the wrong statement about coating/electroplating of metals ?
Correct answer: E. 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. coating metal is made the anode
- E. Calorising is the process of coating steel with chromium
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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