A new type of electrochemical hydrogen sensor outward attached to pipeline and vessel was designed, studied and developed according to the principle of Devanathan cell. The level of signal output, the hydrogen permeation current density (I_H) through UNS G10190 and UNS G11180 steel plates was measured in 5%NaCl solutions with different concentration of H_2S. Nevertheless, the relationship between I_H and the concentrition of H_2S and temperature was set up. Simultaneously, the strength/embrittlement and the fractograph of the steels in the same solution were studied by the Slow Strain Rate Tensile(SSRT) technique and Scanning Electron Microscope(SEM). Based on those results, the corresponding relationship between I_H and the susceptibility of the embrittlement of the steels was extablished. The critical parameters, by which the Susceptibility of the steels to Sulfide Stress Corrosion Cracking(SSCC) can be judged, provided for software design of the intelligent monitor. By corresponding software and hardware, a computer system can be desinged for in-situ inspecting/monitoring the susceptibility of the steel to SSCC or Hydrogen Embrittlement automatically.
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