Corrosion Behavior of Active Screen Plasma Nitrided 38CrMoAl Steel under Marine Environment

5th Asia Conference on Mechanical and Materials Engineering

机械制造;材料科学

Yang, Li^1,2 ; He, Yongyong^1 ; Mao, Jun Yuan^1 ; Zhang, Lei^2

State Key Laboratory of Tribology, Tsinghua University, Beijing

100084, China^1

Department of Materials Science and Engineering, Yantai University, Yantai

264005, China^2

关键词: 3.5% nacl solutions;    Active screen plasma;    Active screen plasma nitriding;    Anodic polarization curves;    Corrosion potentials;    Electromechanical measurements;    Marine environment;    Polarization curves;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/241/1/012008/pdf
DOI  :  10.1088/1757-899X/241/1/012008

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The 38CrMoAl steels were nitrided at different temperatures for 7 h using active screen plasma discharge. The analysis showed that the thick compound layer composed of -Fe2-3N and γ′-Fe4N was formed on the surface. The corrosion behavior was evaluated by measuring the anodic polarization curves in natural sea water (similar 3.5% NaCl solution), and observation of corroded surface were conducted. The electromechanical measurements indicated that the corrosion potential of the nitrided specimens shifted to a nobler value compared to that of untreated specimens. Passive regions were also observed in the polarization curves for all the nitrided specimens. These results indicate that active screen plasma nitriding can enhance the corrosion resistance of the 38CrMoAl steel under marine environment.