Corrosive Pollution Simulator

Corrosive Pollution

pH of rainfall 4.0

Temperature 22 °C

Pollutant concentration 1.0×

Avg. corrosion depth

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Corrosion rate

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Panels critical

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Exposure time

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How it works

Acidic pollutants — sulfur and nitrogen oxides dissolved in rainwater as sulfuric and nitric acid — attack exposed metal by supplying free H⁺ ions that oxidize the surface faster than clean water ever could. Each droplet that lands on a panel below deposits a tiny dose of acid; the panel's corrosion depth accumulates dose after dose, visualized here as the panel visibly shrinking and its color shifting from bare metal to rust.

rate = k₀ · 10^(−pH) · C · exp(−Eₐ / R·T)
depth(t) = depth(t−dt) + rate·dt

pH of rainfall — each drop below neutral (7) is a ten-fold jump in H⁺ concentration, so lowering pH from 5 to 4 roughly multiplies the corrosion rate by ten.
Temperature — reaction kinetics speed up with heat (Arrhenius term); a hot, humid climate corrodes exposed metal far faster than a cold one at the same acidity.
Pollutant concentration — scales how much dissolved corrosive material each droplet actually carries, independent of how acidic it measures.
Acid rain toggle — pause the rainfall to watch corrosion accumulation freeze while panels already damaged stay visibly pitted.

Real-world relevance: this is the same mechanism that pits steel bridges, dissolves limestone facades and etches car paint in industrial and heavily trafficked regions — acid deposition from SO₂/NOₓ emissions remains one of the most direct, visible costs of air pollution on built infrastructure.

Bare metal Corroding Critical damage Acid droplet

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