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In this study the effect of hydrogen penetration on the UNS S32750 super duplex stainless steel WAS investigated. As the main purpose, the effect of welded section in 3.5% sodium chloride solution on the microstructure, corrosion behavior, as well as initiation and propagation of pits WAS investigated in this paper. In order to investigate hydrogen penetration, the samples were cathodically charged at a potential of -1300 mV (SCE) for 160h at room temperature. Furthermore, to analyze the effect of hydrogen penetration on the initiation and expansion of the pits, the samples were stored for a period of 160h before and after cathodic charging at a constant potential of 800 mV (SCE). Scanning electron microscopy images are also available from Fracture surfaces. The results of the tensile test show that hydrogen penetration on the UNS S32750 super duplex stainless steel reduces the strain from 64.1 to 58.2% for simple sample, and 46.9 to 38.4% for welded samples. In addition, the results of Potentiodynamic and Potentiostatic tests indicated that hydrogen penetration increased the corrosion rate and increased the number and propagation of the pits

Keywords: Super duplex stainless steel, Hydrogen penetration, Mechanical properties, Microstructure, Corrosion behavior

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