Electrochemical hydrogen permeation measurement through high-strength steel under uniaxial tensile stress in plastic range

In the electrochemical hydrogen permeation test for high-strength steels under plastic loading, the failure of palladium coating has raised controversy over the reliability of the permeation data. To avoid rupture of a palladium layer under plastic stress, a new permeation technique was employed. This study clearly proves that the palladium film obtained by the new technique leads to a highly stable background current even under severe stress conditions, ensuring the reliability of the permeation data under both elastic and plastic stress.