Effects of hydrogen on pitting susceptibility for duplex stainless steel
UNS S32750 duplex stainless steel foils were precharged with hydrogen at different current densities.The effects of hydrogen on the pitting corrosion susceptibility were investigated by carrying out the GB/T4334 standard ferric chloride tests and electrochemical methods.In the 6% FeCl3 solution,the pitting appeared on the precharged specimen within 6 days,while not on the specimen without hydrogen for more-than 30 days.The pitting density and diameter increased with the rise of charging current density.These results showed that hydrogen in the duplex stainless steel greatly promoted the pitting initiation.The pitting was observed located mainly in the ferrite (α)phase.In the electrochemical tests,hydrogen precharging decreased the pitting potential and corrosion potential for the duplex stainless steel.
duplex stainless steel pitting corrosion ferrite phase
Li Jinxu Bai Yu Qiao Lijie Qi Huibin Zhou Qingjun
Center of Corrosion and Protection,University of Science and Technology Beijing,Beijing 100083 ,Chin Baosteel Reaserch Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China
国际会议
上海
英文
397-401
2008-09-26（万方平台首次上网日期，不代表论文的发表时间）