Author/Authors :
Chen, Dengming School of Metallurgy and Materials Engineering - Chongqing University of Science and Technology - Chongqing , China , Zheng, Qiang School of Metallurgy and Materials Engineering - Chongqing University of Science and Technology - Chongqing , China , Li, Kejian School of Metallurgy and Materials Engineering - Chongqing University of Science and Technology - Chongqing , China , Yin, Xueguo School of Metallurgy and Materials Engineering - Chongqing University of Science and Technology - Chongqing , China , Li, Bingbing School of Metallurgy and Materials Engineering - Chongqing University of Science and Technology - Chongqing , China , Li, Chunhong School of Metallurgy and Materials Engineering - Chongqing University of Science and Technology - Chongqing , China , Ma, Yilong School of Metallurgy and Materials Engineering - Chongqing University of Science and Technology - Chongqing , China , Sun, Jianchun School of Metallurgy and Materials Engineering - Chongqing University of Science and Technology - Chongqing , China
Abstract :
A nanocrystalline layer was prepared on the surface of 34CrMo4 steel by time controlling shot peening (SP, i.e., 1, 5, 10, and 20minutes). Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) analysis, and transmission electronmicroscope (TEM) were applied to analyze the surface, cross-sections, and grain size of the specimens before and after SP. Theelectrochemical corrosion behavior was used to simulate a liquid under the oil and gas wells environment. It was characterizedby the potentiodynamic polarization test and electrochemical impedance spectroscopy (EIS). The analysis results show that thesurfaces of the SP samples were very rough and had numerous cracks. A passive film on SP surface was formed by nanocrystallinegrains. However, the passive film formed in the initial stage was not dense or uniform, and cracks occurred in the passive filmduring peening, resulting in a decrease in corrosion resistance
Keywords :
Corrosion Properties , 34CrMo4 Steel Modified , Shot Peening , TEM , FESEM
