The atmospheric corrosion progress is traditionally tracked gravimetrically by determining mass gain or mass loss of the samples after exposure. This work introduces a new method that makes it possible to monitor the real time atmospheric corrosion rate of Mg alloys during exposure. The idea is to measure the amount of hydrogen evolved during atmospheric corrosion. This is realized with an adaption of the gravimetric hydrogen collection method, originally developed by Curioni . The change in buoyancy exerted by the evolved hydrogen gas can be accurately measured. Therefore, it is possible to monitor the instant atmospheric corrosion rate even at the initial stages of corrosion where mass loss measurements are difficult. Different exposure conditions like relative humidity, temperature or CO2 content can be studied. The possible contribution of the oxygen reduction reaction to the cathodic processes will be discussed.
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