B30铜镍合金表面植酸转化膜的制备工艺研究

doi:10.11896/cldb.18040031

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Abstract Aiming at improving the corrosion resistance of phytic acid conversion film on the surface of B30 Cu-Ni alloy, scanning electron microscope(SEM), potentiodynamic polarization method and electrochemical impedance spectroscopy (EIS) were employed to investigate the effects of immersion duration, phytic acid concentration and molybdate concentration on the microstructure of the conversion film on B30 Cu-Ni alloy and its corrosion inhibition efficiency in 3.5% NaCl solution. The results indicated that the corrosion inhibition efficiency of phytic acid conversion film increased gradually with the extension of immersion duration. While the immersion duration exceeded 12 h, cracks appeared on the surface of phytic acid conversion film, which destroyed the integrity of the film and leaded to the decrease of corrosion resistance. Moreover, the corrosion inhibition efficiency of phytic acid conversion film improved with the increasing phytic acid concentration. When the phytic acid concentration exceeded 10 mmol/L, the microstructure of phytic acid conversion film became loose and porous, and its corrosion inhibition efficiency declined because of the poor compactness of the film. Besides, with the addition of sodium molybdate, composite conversion film was formed and its corrosion inhibition efficiency enhanced with increasing molybdate concentration. However, when the concentration of sodium molybdate exceeded 50 mg/L, the corrosion inhibition efficiency of the composite conversion film began to decrease. Various immersion duration and phytic acid concentration can exert obvious impact on the corrosion resistance of the phytic acid conversion film on B30 Cu-Ni alloy by changing its integrity and compactness. The corrosion resistance of the phytic acid conversion film can be further improved by adding molybdate to the phytic acid solution.

Key words： phytic acid molybdate conversion film B30 Cu-Ni alloy corrosion resistance

Published: 30 September 2019

CLC number:

TG172.5

Fund:This work was financially supported by Shandong Province Key Research and Development Programs (2017GSF17119).

About author:: Qinpeng Chang obtained his M.E. degree from the Ocean University of China and is currently studying for his doctorate in the Ocean University of China. He worked in Qingdao Water Group Co. Ltd., engaged in water supply pipe protection and management in 2014—2017. He has published four journal papers as the first author. His research interests focus on the corrosion and protection of metals, and the behavior of surface films.
Youyuan Chen received her Ph.D. degree from the Ocean University of China and served in the Ocean University of China till now. She is currently an associate professor and dean of the Department of Environmental Engineering. She performed collaborative research in 1998—1999 in Swiss Federal Institute of Technology Zurich. She has published more than 80 journal papers. Her team’s research interests are the corrosion and protection of metals in the marine environment, and environmental protection. She participated the National Natural Science Foundation of China (NSFC) and National water pollution control and management technology major projects. She hosted Shandong Province’s Key Research and Development Programs and Natural Science Fundation of Shandong Province.

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Cite this article:

CHANG Qinpeng,CHEN Youyuan,AN Zhendong, et al. Preparation Process of Phytic Acid Conversion Film on B30 Cu-Ni Alloy[J]. Materials Reports, 2019, 33(23): 3876-3881.

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http://www.mater-rep.com/EN/10.11896/cldb.18040031 OR http://www.mater-rep.com/EN/Y2019/V33/I23/3876

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