Is the corrosion by-product (white rust) of zinc a good protective finish?
White rust is a loose powdery coating which is not a good protective finish for corrosion protection. Zinc is used as a barrier and an anode in the cathodic protection process. Unprepared zinc is an inhibitor to a good bond. • If corrosion cost to the US is $600,000,000, where is the most corrosion found? Close to 35% of the total cost of corrosion is located in the utility business. Drinking water and sewer systems consists of 75% of the total cost of utility corrosion.