Corrosion and Cavitation Erosion Behavior of GLNN/Cu Composite in Simulated Seawater
Received date: 2021-08-11
Revised date: 2021-08-30
Online published: 2021-10-18
Supported by
National Natural Science Foundation of China(52031007);National Natural Science Foundation of China(52171077);Tianjin Science and Technology Support Project(17ZXCLGX00060);China Postdoctoral Science Foundation(2020M670648);China Postdoctoral Science Foundation(2021T140505)
Herein, three-dimensional graphene-like nanosheet network (3D-GLNN)/copper (Cu) materials were synthesized using hop-pressing (HP) and hot-rolling (HR) methods and their corrosion resistance and mechanism were investigated using polarization curves, electrochemical impedance spectroscopy (EIS), and weight loss data after a cavitation corrosion test. Microstructural characterization results revealed that the 3D-GLNN structure was intact in the bulk composites, thereby restricting the effective grain growth of the Cu matrix. Compared with pure Cu, the Vickers hardness of 3D-GLNN/Cu fabricated using the HP and HR methods improved by 8% and 46%, respectively. Polarization curve results indicated that the anodic dissolution current of 3D-GLNN/Cu was considerably lower than that of pure Cu, indicating that 3D-GLNN/Cu exhibited better corrosion resistance. EIS measurements under a corrosion potential revealed that the electrode process kinetics was complex, with both charge and mass transfer controlling it. By extending the immersion time from 1 h to 9 d, the corrosion potential first became positive and then became negative. The capacitance arc at a high-frequency EIS range first increased and then decreased, attributed to the formation and detachment of a CuCl salt film. Diffusion impedance was observed in the low-frequency EIS range, with a phase angle of 18°-23°, indicating that the mass transfer process was not attributed to a single species but controlled by anodic and cathodic reactants. The constant phase angle element (CPE) behavior of the electrochemical system was further evaluated using the ohm-corrected phase angle and impedance modulus. The high-frequency phase angle was greater than -90
Chengcheng PAN , Xiang ZHANG , Fan YANG , Dahai XIA , Chunnian HE , Wenbin HU . Corrosion and Cavitation Erosion Behavior of GLNN/Cu Composite in Simulated Seawater[J]. Acta Metall Sin, 2022 , 58(5) : 599 -609 . DOI: 10.11900/0412.1961.2021.00333
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