You're checking a lab report after googling "convert corrosion current density to corrosion rate mm per year". A carbon steel coupon shows icorr = 5 µA/cm² in neutral aerated water at 25 °C. Using Faraday-based corrosion rate estimation with an equivalent weight of 27.9 and density of 7.85 g/cm³, what general corrosion rate should you record?

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Accepted Answer

A lines up with the standard shortcut many of us carry: 1 µA/cm² on carbon steel is roughly 0.011–0.013 mm/y, so 5 µA/cm² lands near 0.06 mm/y. B comes from dropping a decimal when converting cm to mm, something you see when someone works straight from mpy charts without checking units. C feels attractive if you're used to stainless numbers and forget that carbon steel dissolves faster for the same current density. D shows up when the equivalent weight is misread as atomic weight, which quietly inflates the rate.

Corrossion & Testing

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