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<p>Pitting potential (Ep) and stress corrosion cracking potential (ESCC) of super duplex stainless steel (SDSS) grade (UNS S32760) were determined using potentiodynamic polarization and slow strain rate test (SSRT) methods at 130<sup>0</sup> C. SSRT tests were conducted at controlled applied potentials (EAPP) from + 0 to + 1200&#xa0;mV (Ag/AgCl) in 15 and 1000&#xa0;ppm chloride to determine the stress corrosion cracking (SCC) resistance response of SDSS material. Potentiodynamic polarization tests were also conducted at 130C in chloride concentration from 15, 100, 1000, 10,000 &amp; 22,000&#xa0;ppm, showed pitting resistance of SDSS material decrease with increase in chloride concentration. SSRT results indicate that isolated microcracks initiate at applied potentials below ~ 500&#xa0;mV, with crack coalescence occurring near E<sub>SCC</sub> (~ 500&#xa0;mV) and rapid degradation dominated by localized galvanic and pitting corrosion at higher potentials. Microstructural characterization using SEM and EBSD revealed that damage below Ep and E<sub>SCC</sub> is associated with short cracks and selective phase attack, whereas at potentials exceeding Ep by ~ 200&#xa0;mV, pit–crack interactions become dominant. Grain size distribution, phase morphology, and phase continuity particularly along the rolling direction were found to influence pit growth and crack propagation.</p>

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Effect of electrochemical potential on pitting and stress corrosion cracking of super duplex stainless steel

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Janardhan Rao Saithala,
  • Harvinder Singh Ubhi

摘要

Pitting potential (Ep) and stress corrosion cracking potential (ESCC) of super duplex stainless steel (SDSS) grade (UNS S32760) were determined using potentiodynamic polarization and slow strain rate test (SSRT) methods at 1300 C. SSRT tests were conducted at controlled applied potentials (EAPP) from + 0 to + 1200 mV (Ag/AgCl) in 15 and 1000 ppm chloride to determine the stress corrosion cracking (SCC) resistance response of SDSS material. Potentiodynamic polarization tests were also conducted at 130C in chloride concentration from 15, 100, 1000, 10,000 & 22,000 ppm, showed pitting resistance of SDSS material decrease with increase in chloride concentration. SSRT results indicate that isolated microcracks initiate at applied potentials below ~ 500 mV, with crack coalescence occurring near ESCC (~ 500 mV) and rapid degradation dominated by localized galvanic and pitting corrosion at higher potentials. Microstructural characterization using SEM and EBSD revealed that damage below Ep and ESCC is associated with short cracks and selective phase attack, whereas at potentials exceeding Ep by ~ 200 mV, pit–crack interactions become dominant. Grain size distribution, phase morphology, and phase continuity particularly along the rolling direction were found to influence pit growth and crack propagation.