Question

Steel parts such as nails and screws are often coated with Zinc because... Question 7 options: a) none of the other options shown b) the zinc prevents contact between the steel and electrolyte. c) all of the other choices shown d) zinc acts as sacrificial metal if corrosion occurs. e) zinc is anodic to iron (steel).

Answer 1

Best answer is option (d).:- coating of the zinc on steel metal parts is also known as galvanizing process. This process is done generally by hot dipping method in which parts is submerged into the hot melted zinc. And so at the interface two types of electrode is formed one is cathod and other one is anode. Zinc is anode and steel part is cathode. And electrolyte is atmospheric gases. Zinc becomes sacrificial metal because even if some zinc coating is removed by scratching or any other means remaning zinc will protect the steel material by corroding first.