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96246 CATHODIC HYDROGEN EMBRITTLEMENT OF A 22% CHROMIUM 5% NICKEL DUPLEX STAINLESS STEEL IN SULFIDE CONTAINING 3.5 wt%. NaCl SOLUTION

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Product Number: 51300-96246-SG
ISBN: 96246 1996 CP
Author: S. Y. Tsai, H. C. Shih, K. P. Yen
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Hydrogen embrittlement (HE) of a 2205 duplex stainless steel has been studied by slow straining of tensile specimens in sulfide containing 3.5 Wt% NaCl solution. A more complex sulfide-concentration-dependent loss in ductility was discovered at controlled potentials in - 1100mV (SCE). It is believed that HE was controlled by the critical concentration of S as a promoter at lower sulfide levels and recovely of ductiIity at higher sulfide concentrations was attributed to the role of the sulfide as a cathodic inhibitor. No stress corrosion cracking (SCC) was observed at anodic polarization in this system. The electrochemical results indicate that the corrosion potentials of 2205 duplex stainless steel in 3.5 wt% NaCl solution move to the less noble direction with increasing the sulfide concentration or with decreasing the solution acidity, This trend was not influenced by the presence of dissolved oxygen. Under severe HE environments, transgranular cleavage is the favored path for cracking. Keywords: hydrogen embrittement, duplex stainless steel, cathodic polarization, sulfide, NaCl solution.
Hydrogen embrittlement (HE) of a 2205 duplex stainless steel has been studied by slow straining of tensile specimens in sulfide containing 3.5 Wt% NaCl solution. A more complex sulfide-concentration-dependent loss in ductility was discovered at controlled potentials in - 1100mV (SCE). It is believed that HE was controlled by the critical concentration of S as a promoter at lower sulfide levels and recovely of ductiIity at higher sulfide concentrations was attributed to the role of the sulfide as a cathodic inhibitor. No stress corrosion cracking (SCC) was observed at anodic polarization in this system. The electrochemical results indicate that the corrosion potentials of 2205 duplex stainless steel in 3.5 wt% NaCl solution move to the less noble direction with increasing the sulfide concentration or with decreasing the solution acidity, This trend was not influenced by the presence of dissolved oxygen. Under severe HE environments, transgranular cleavage is the favored path for cracking. Keywords: hydrogen embrittement, duplex stainless steel, cathodic polarization, sulfide, NaCl solution.
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