The levels of the signal output (hydrogen permeation current) of a new kind of electrochemical hydrogen sensor in hydrochloric acid respectively containing two inhibitors with various concentrations are studied. Simultaneously, the Slow Strain Rate Tensile (SSRT) technique, Scanning Electronic Microscope (SEM) and Metallographic examination are used to study the strength/embrittlement and the fractograph of boiler steels in the same acid. Based on the corresponding relationship between the signal output by the sensor and the susceptibility of the embrittlement of the steels, the physical significance of the measured signals can be determined. Some defined currents can be used as the basic criteria for evaluation of the susceptibility of Hydrogen Induced Cracking (HIC) of boiler steel in the acid solutions. Some key parameters are provided for software design of the intelligent probe.
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