Corrosion of stonework


Nature

Stonework is corroding through the world mostly due to pollution of the atmosphere. While the rate of corrosion on structurally used stone may be very slow, a centimetre a century, this rate on decorative stonework is disastrous. Priceless statues are being eaten away.

Background

Sulphur dioxide formed by burning high-sulphur fossilized fuel is especially damaging to limestone. The calcium carbonate interacts with the sulphur dioxide and becomes calcium sulphate which is more soluble and washes away in the rain.


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