The corrosive influence of 3,5% sodium chloride – water solution on tensile mechanical and Barkhausen magnetical noise response of an ARMCO steel was investigated. This response was correlated with the micro-failure behavior gained by SEM – Fractography observations. It was found that the increasing time (degree) of corrosion leads to a dramatic and consistent decrease of the tensile ductility and to a noticeable increase of the Barkhausen noise signal. Especially, it was shown that during the tensile loading of the corroded specimens the magnetic Barkhausen signal is monotonically increasing up to the fracture point. This on load increase of the magnetic signal is enhaced by the time (degree) of corrosion. Fractography analysis shown features concerning ductile-brittle, mixed-mode of failure where the brittle component tends to dominate with increasing time (degree) of corrosion.