Physical Metallurgy · Corrosion · 1 mark · Numerical answer
An iron plate of total exposed area 50 cm² loses 200 g through atmospheric corrosion over 10 years. Find corrosion rate in kg/(m² year), rounded to an integer.
Convert lost mass to 0.2 kg and area to $50\times10^{-4}=0.005$ m². Average mass-loss rate per area is $0.2/(0.005\times10)=4$ kg/(m² year). The stated area is already the total exposed area, so no extra two-sided factor is needed.
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