METALS AND METAL MATRIX COMPOSITES |
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Preparation of Ni-Co-B-Pr Composite Coating with High Performance of Corrosion Resistance by Electroless Plating Method |
ZHU Yunna, GAO Lixia, XIONG Tongtong, DU Chan, ZHANG Shimin, CHEN Biqing
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College of Chemistry and Chemical Engineering, Qinghai Normal University, Xining 810000, China |
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Abstract Utilizing 99.99% Cu substrate (1 cm×1 cm×1 mm) as substrate, a series of Ni-Co-B-Pr coating has been synthesized by electroless pla-ting method under varying the ratio of Ni2+/Co2+ and concentrations of Pr3+, and the best corrosion resistance coating was annealed at different temperatures. Use EDX, XRD, SEM and other test methods to characterize and analyze the surface morphology, crystal structure and corrosion resistance of the coating. Tafel curve, immersion method and porosity test were used for corrosion behavior of Ni-Co-B-Pr composite coating. The results show that the Ni-Co-B-Pr coating has an amorphous structure. With the increase of the Ni/Co salts ratio and the Pr3+ concentration, the particles are refined and the cracks of the coating are reduced, but after reaching a certain level, the quality of the coating is reduced. In Tafel curve test (3.5%NaCl solution), the best corrosion resistance was obtained for coating prepared at Ni/Co salts ratio of about 3/2 and Pr3+ concentration of about 3 g/L, in which Eccor is -0.436 V and Icorr is 0.586 A·cm-2. This result is further proved by the immersion method and porosity test. After annealing, the particles of the coating become larger, and the coating changes from amorphous to crystalline. The annealing temperature was 200 ℃, the coating had a best corrosion resistance performance. As the temperature continues to rise, the corrosion resistance of the coating decreases.
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Published: 23 February 2021
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Fund:This work was financially supported by the National Natural Science Foundation of China (21553002), Qinghai Basic Research Program (2016-ZJ-753). |
Corresponding Authors:
chenbq2332@163.com
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About author:: Yunna Zhu began her postgraduate research in Qinghai Normal University. Her mainly research field is electrochemical catalytic nanomaterial. Biqing Chen, professor, research work mainly includes electrochemical and inorganic material preparation. |
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