Measurement of Surface Hydrogen Concentration of Steel Bar with Electrochemical Hydrogen Permeation Method

Abstract

For accurately evaluating the risk of hydrogen embrittlement in steels, the hydrogen concentration near the steel surfaces needs to be determined. An electrochemical hydrogen permeation method to measure sub-surface hydrogen concentration can use steel sheets but not steel bars. Because iron oxide and working strain generated in the manufacturing process that affects hydrogen permeability are present on the sub-surface of steel bars, we need to evaluate steel bars directly. In this report, we research an electrochemical hydrogen permeation method and method to determine the surface hydrogen concentration for steel bars.