Question: 6. (a) State the difference(s) between surface oxidation and corrosion of metals. (b) Describe the Pilling-Bedworth ratio. (c) Calculate the Pilling-Bedworth ratio for tin

6. (a) State the difference(s) between surface oxidation and corrosion of metals.

6. (a) State the difference(s) between surface oxidation and corrosion of metals. (b) Describe the Pilling-Bedworth ratio. (c) Calculate the Pilling-Bedworth ratio for tin (Sn) having a density of 7.30 g/cm. The oxide film formed on the surface of this metal is SnO2 having a density of 6.95 g/cm. The atomic mass of tin is 118.7 g/mol and the molecular mass of SnO2 150.7 g/mol. (d) Discuss whether the oxide scale formed will be protective or not. Provide justification to your answer.

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