Question

What are the requirements for fine coating​ in electroplating process?​[4 marks]

Answer 1

Electroplating is the process of depositing a layer of a desired metal on another material by means of electricity. The process should have the following requirements that need to be followed:

• The object to be electroplated should be free from greasy matter. Without a properly cleaned surface, even the most expensive metal coatings will fail to adhere or protect an object from the outside environment. (1 mark)
• The surface of the article should be rough so that the metal deposited sticks permanently. (1 mark)
• The concentration of the electrolyte should be adjusted so as to get a smooth coating. The concentration and the kind of electrolyte affect the electroplating process because these affect the potential difference which you will learn in your higher grade. (1 mark)
• Current must be the same throughout. Low current for a longer time causes a smooth, uniform and long-lasting deposition of material. High current causes irregular deposition of the metal. (1 mark)