Application of magnetic hysteresis loop for analysis of corrosion properties of steel.

The article focuses on developing an innovative method of predicting steel corrosiveness. The influence of heat treatment upon the corrosion rate and magnetic properties is revealed by corrosion tests of hot worked structural steel samples where the maximum corrosion loss was observed at the tempering temperature of 200°C. The correlation between magnetic properties of steels and their corrosiveness, which was confirmed by correlating the corrosion loss of the 45Х (45KH) steel and its magnetic parameters. An express method of scanning magnetic parameters was offered to spot potentially corrosive zones. An indirect correlation between magnetic parameters and corrosiveness is not necessarily unambiguous. A multi-parameter approach can be considered as a solution to the problem of ambiguity. Via the harmonic decomposition of magnetic hysteresis loops of 45X (45KH) steel samples, a range of odd harmonics was obtained, of which some correlate weakly with the corrosion loss. Sets of several harmonics correlate with it to a greater degree. Determining corrosiveness using magnetic parameters can be reduced to classical problems of diagnostic engineering. [ABSTRACT FROM AUTHOR]