We are running an accelerated corrosion experiment on large-scale RC specimens. The accelerated corrosion technique we are implementing is the impressed constant current. In the corrosion setup, we have the anode (the steel reinforcement in the specimens), and the cathode which is an external steel mesh. The specimens are immersed in NaCl solution. The cathode steel mesh, while being connected to the DC power supply unit, produces smoke that comes out from the rebar ends, as in the attached video. Does any one have an explanation for this? I would appreciate if anyone can share expertise on this.
your cathode is probably very over-polarized to drive the current to the anode, so it comes to gas evolution or something like that. cause is maybe a too high resistance in your circuit (via the concrete) and/or the cathode area is way too small compared to the anode area.
This is hydrogen evolution at the cathode. Normal in such a test. Turn down the current and it will slow.
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