Abstract
A basic study addressing a localized corrosion monitoring system using the electrodes of a short pipe was carried out to determine whether such a system could be applied to the piping in salt manufacturing plants. A short pipe made of SUS304 stainless steel, the inner surface of which was embedded with platinum electrodes, 76 μm in diameter, to simulate the local anodes, was configured as an evaluation test electrode. An anodic current simulating the local current from localized corrosion during the initial stages was applied to the simulated local anode, and the resulting potential noise response was measured in a 10-mass％ NaCl solution. When an anodic current of a level corresponding to that of the initiation of pit-embryos, 2.6 to 20.5 μm in diameter, was applied to the simulated local anode, synchronized RD-type potential noise was observed. For every investigated waveform of the anodic current, the amplitude of the potential noise increased with applied current.
