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Monitoring Corrosion
Although stress corrosion cracking is used for understanding the corrosion behavior of components exposed to stress and corrosive environments, the challenge with such an approach is inability to predict the corrosion rates at precise stress levels. To address this, a novel electrochemical-uniaxial stress accelerated corrosion monitoring system was being demonstrated for the first time to measure the change in corrosion potential, corrosion current density and corrosion mechanisms at specific applied stress levels.
In this set up, a Gamry Ref3000 potentiostat in a three electrode configuration is used for measuring the electrochemical signals arising from the sample. A saturated calomel electrode is used as reference electrode, high density graphite as counter electrode and the sample was connected as the working electrode. Uniaxial tensile loading component of the SAE module was applied using ADMET eXpert 4000™ professional table-top micro tensile testing machine was used for carrying out tensile experiments. The two systems were operated by independent standalone computers and respective software.
How is this different
The novelty of this tool arises from the fact that distinct mechanical yielding features can be seen as cleaner corrosion signatures
The corrosion rate under normal conditions is driven by a current density of 10n Amps per square cm, where as under stress, the same material tends to have a corrosion rate driven by a corrosion current density as high as 9 microamps per square cm!
The accelerated corrosion due to the fact that there are excessive anodic sites on the surface, originating from the fracture and discontinuity on the surface, exposure of underlying virgin material that is unpassivated. This leads to the excessive metal attack and thereby higher corrosion current density.
Related publication can be found here: https://arxiv.org/abs/2106.03690
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