Discussion
A galvanised coating \( 85 \) micrometres thick corrodes at \( 6.0 \) micrometres a year. Its life is about
Answer: A
Correct answer: 14 years
Divide the coating thickness by the corrosion rate:
\[ \frac{85}{6.0} = 14.2\ \mathrm{years} \]
In clean air, at \( 1.2 \) micrometres a year, the same coating would last about 70 years - so pollution shortens the maintenance interval fivefold. This is the practical form in which materials damage enters an economic assessment: not as an abstract corrosion rate but as the cost of repainting and replacement brought forward by decades.
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