In situ giant- magnetoimpedance magnetometer measurement of weak magnetic fields produced by pitting corrosion on AISI 304 stainless steel surface

Weak magnetic fields of pitting corrosion currents in AISI 304 stainless steel have been measured by means of giant magneto-impedance magnetometer. Corrosion current density of a single pit has been calculated by magnetic fields mathematical modelling. The current density was also estimated by alloy mass loss in the pit that had been evaluated through optical measurement. The difference between obtained results was 16%. Moreover, pitting repassivation has been detected experimentally.