The SCC (stress corrosion cracking) susceptibility of steel l6Mn in nitratesolution was studied. The results showed that applied potential polarization would accelerate(anodic polarization) or retard (cathodic polariz...The SCC (stress corrosion cracking) susceptibility of steel l6Mn in nitratesolution was studied. The results showed that applied potential polarization would accelerate(anodic polarization) or retard (cathodic polarization) the SCC process. The study on phaseelectrochemistry revealed that there was significant difference in electrochemical performancebetween ferrite and pearlite of steel 16Mn. Pearlite preferentially corroded under the action ofgalvanic cell. The observation on time and in situ showed that corrosion started first at the phaseboundary between ferrite and pearlite, and the pearlite gradually corroded until disappeared, andthen corrosion crossed the phase boundary extending into the ferrite phase. According to this, ananodic dissolution mechanism of SCC was proposed, on which pre-existing sting active path and phaseelectrochemistry (PEAP-PEC) jointly came into action (SCC mechanism of PEAP-PEC).展开更多
基金This work was supported by the National Natural Science Foundation of China (No. 5880009) and the Beijing Natural Science Foun-
文摘The SCC (stress corrosion cracking) susceptibility of steel l6Mn in nitratesolution was studied. The results showed that applied potential polarization would accelerate(anodic polarization) or retard (cathodic polarization) the SCC process. The study on phaseelectrochemistry revealed that there was significant difference in electrochemical performancebetween ferrite and pearlite of steel 16Mn. Pearlite preferentially corroded under the action ofgalvanic cell. The observation on time and in situ showed that corrosion started first at the phaseboundary between ferrite and pearlite, and the pearlite gradually corroded until disappeared, andthen corrosion crossed the phase boundary extending into the ferrite phase. According to this, ananodic dissolution mechanism of SCC was proposed, on which pre-existing sting active path and phaseelectrochemistry (PEAP-PEC) jointly came into action (SCC mechanism of PEAP-PEC).
