PROBLEMS 1. Derive the general relation between mm/y and gmd. 2. Magnesium corrodes in seawater at a rate of 1.45gmd. What is the rate in mm/y? If this corrosion rates applies to lead, what is the corresponding rate in mm/y? 3. Laboratory corrosion tests on three alloys in an industrial waste solution show the following results: Material Density of Material (g/cm) Weight Loss (gmd) Pitting Factor A B 2.7 9.0 7.8 40 62 5.6 1 2 9.2 Calculate maximum penetration in millimeters for each material at the end of one year