Effect of solution pH,Cl- concentration and temperature on electrochemical behavior of PH13-8Mo steel in acidic environments  

作　　者：Xue-ying Li Chun-hua Fan Qian-lin Wu Li-hua Dong Yan-sheng Yin Chang-jun Wang Jian-xiong Liang 

机构地区：[1]College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China [2]Institute of Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China

出　　处：《Journal of Iron and Steel Research International》2017年第12期1238-1247,共10页

基　　金：financially sponsored by the National Basic Research Program of China(2014CB643306)

摘　　要：The effect of solution pH,Cl;concentration and temperature on the electrochemical corrosion behavior of PH13-8Mo steel in acidic solution was investigated by using the electrochemical tests,scanning electron microscopy and X-ray photoelectron spectroscopy.The PH13-8Mo martensitic precipitation hardened stainless steel is in the passivity state when the pH value is above 3.0,below which the anodic polarization curves of the steel are actively dissolved.The corrosion current density gradually decreases with increasing the solution pH and decreasing Cl;concentration and solution temperature.Pits are initiated on the sample surface in the presence of the Cl;and gradually developed into uniform corrosion with increasing the Cl;concentrations.Moreover,the corrosion is more serious with an increase in solution temperature.The effect of solution pH,Cl^- concentration and temperature on the electrochemical corrosion behavior of PH13-8Mo steel in acidic solution was investigated by using the electrochemical tests,scanning electron microscopy and X-ray photoelectron spectroscopy.The PH13-8Mo martensitic precipitation hardened stainless steel is in the passivity state when the pH value is above 3.0,below which the anodic polarization curves of the steel are actively dissolved.The corrosion current density gradually decreases with increasing the solution pH and decreasing Cl^- concentration and solution temperature.Pits are initiated on the sample surface in the presence of the Cl^- and gradually developed into uniform corrosion with increasing the Cl^- concentrations.Moreover,the corrosion is more serious with an increase in solution temperature.

关 键 词：PH13-8Mo steel Polarization Electrochemical impedance spectroscopy Passive film pH value Electrochemical behavior 

分 类 号：TG142.1[一般工业技术—材料科学与工程]