A Solid-State Potentiometric Sensor for Monitoring Hydrogen in Commercial Pipeline Steel Available to Purchase

A solid-state potentiometric sensor for monitoring hydrogen in commercial pipeline steel was developed. Performance of the sensor was investigated using five commercial steels into which hydrogen was introduced by gas charging or by corrosion reactions. The equivalent pressure of hydrogen $(pH2eq)$ in the steel as determined by the sensor was related to the concentration of hydrogen and to the extent of cracking of the steel. A critical $pH2eq$ value in a steel, above which the steel would crack, was defined.