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Microstructure and corrosion resistance of Ni–P gradient coating/stannate conversion film on magnesium alloy

  • Xiao-jia Liu (a1), Wan-chang Sun (a1), Ya-ru Dong (a1), Min Ma (a1), Ya-gang Zhang (a1), Fei Yang (a1) and Yu-yao Ruan (a1)...


A kind of novel Ni–P gradient coating/stannate conversion film was deposited on AZ91D magnesium alloy (AZ91D alloy) by an integrative method involved stannate conversion and electroless plating. The results indicated that using sodium hypophosphite concentrations varied as 5, 10, 22, 46, and 60 g/L in the bath, the electroless Ni–P gradient coating with typical cell morphologies was successfully prepared, and the structures transited from crystalline → microcrystalline → amorphous were obtained as increasing P content from 3.31 to 12.58 wt%. Furthermore, the corrosion morphologies, polarization curves, and the electrochemical impedance spectroscopy result indicated that the corrosion resistance of AZ91D alloy substrate was significantly improved and the corrosion resistance of Ni–P gradient coating was superior than that of stannate conversion film, which might be attributed to the gradient structure and rising P content with unique function.


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1.Li, G., Li, M., Wang, H., Zhang, Z., Cheng, W., Liang, W., and Zhang, C.: Dependence of microstructure characteristics and mechanical properties on nanosize SiCp contents in Mg–9Al matrix composites fabricated by ultrasonic-assisted semisolid powder hot pressing. J. Mater. Res. 33, 18 (2018).
2.Wang, K., Liu, C-M., Zhai, Y-B., and Zou, M-H.: Microstructural characteristics of near-liquidus cast AZ91D alloy during semi-solid die casting. Trans. Nonferrous Met. Soc. China 20, 2 (2010).
3.Wang, Q., Liu, W., Wu, G., Chen, X., and Zhang, H.: Influence of heat treatment on cyclic deformation and low-cycle fatigue behavior of sand-cast Mg–10Gd–3Y–0.5Zr magnesium alloy. J. Mater. Res. 32, 11 (2017).
4.Zhou, M., Xiong, P., Jia, Z., Tan, J., Cheng, Y., and Liu, X.: Improved the in vitro cell compatibility and apatite formation of porous Ti6Al4V alloy with magnesium by plasma immersion ion implantation. Mater. Lett. 202, 9 (2017).
5.Jin, W-H., Hao, Q., Peng, X., and Chu, P-K.: Enhanced corrosion resistance and biocompatibilty of PMMA-coated ZK60 magnesium alloy. Mater. Lett. 173, 178 (2016).
6.Pan, F., Yang, M., and Chen, X.: A review on casting magnesium alloys: Modification of commercial alloys and development of new alloys. J. Mater. Sci. Technol. 32, 12 (2016).
7.Turan, M.E., Sun, Y., and Akgul, Y.: Mechanical, tribological and corrosion properties of fullerene reinforced magnesium matrix composites fabricated by semi powder metallurgy. J. Alloys Compd. 740, 1149 (2018).
8.Fan, Q., Gao, Y., Zhao, Y., Yang, Q., Guo, L., and Jiang, L.: Fabrication of diamond-structured composite materials with Ni–P-diamond particles by electroless plating. Mater. Lett. 215, 242 (2018).
9.Wang, H.L., Liu, L.Y., Dou, Y., Zhang, W.Z., and Jiang, W.F.: Preparation and corrosion resistance of electroless Ni–P/SiC functionally gradient coatings on AZ91D magnesium alloy. Appl. Surf. Sci. 286, 4 (2013).
10.Czagány, M., Baumli, P., and Kaptay, G.: The influence of the phosphorous content and heat treatment on the nano-micro-structure, thickness and micro-hardness of electroless Ni–P coatings on steel. Appl. Surf. Sci. 423, 160 (2017).
11.Moosaie, A. and Panahi-Kalus, H.: Thermal stresses in an incompressible FGM spherical shell with temperature-dependent material properties. Thin-Walled Struct. 120, 215 (2017).
12.Nasirmanesh, A. and Mohammadi, S.: An extended finite element framework for vibration analysis of cracked FGM shells. Compos. Struct. 180, 298 (2017).
13.Phelan, D., Han, F., Lopez-Bezanilla, A., Krogstad, M.J., Gim, Y., Rong, Y., Zhang, J., Parshall, D., Zheng, H., Cooper, S.L., Feygenson, M., Yang, W., and Chen, Y-S.: Structural properties of barium stannate. J. Solid State Chem. 262, 142 (2018).
14.Shi, Z., Cao, F., Song, G.L., Liu, M., and Atrens, A.: Corrosion behaviour in salt spray and in 3.5% NaCl solution saturated with Mg(OH)2, of as-cast and solution heat-treated binary Mg–X alloys: X = Mn, Sn, Ca, Zn, Al, Zr, Si, Sr. Corros. Sci. 76, 11 (2013).
15.Zhu, Y., Xiong, J., Tang, Y., and Zuo, Y.: EIS study on failure process of two polyurethane composite coatings. Prog. Org. Coat. 69, 1 (2010).
16.Li, Q.: Structural and electrochemical behavior of sol–gel ZrO2 ceramic film on chemically pre-treated AZ91D magnesium alloy. J. Alloys Compd. 478, 1 (2009).
17.Li, Q.H., Zhu, D., Liu, W., Liu, Y., and Ma, X.C.: Optical properties of Al-doped ZnO thin films by ellipsometry. Appl. Surf. Sci. 254, 10 (2008).
18.Shao, Z., Ming, W., and Zhang, Q.: Influences of organic additives on stannate conversion coating prepared on the AZ91D magnesium alloy surface. Rare Met. Mater. Eng. 44, 6 (2015).
19.Zhang, W.X., Jiang, Z.H., Li, G.Y., Jiang, Q., and Lian, J.S.: Electroless Ni–P/Ni–B duplex coatings for improving the hardness and the corrosion resistance of AZ91D magnesium alloy. Appl. Surf. Sci. 254, 16 (2008).
20.Wang, H., Yang, G.R., Ma, Y., Zhang, J.Y., and Hao, Y.: Wear resistance of electroless functionally gradient Ni–P coating. Mater. Prot. 43, 3 (2010).
21.Rosalbino, F. and Scavino, G.: Enhanced corrosion resistance of austenitic Fe–Mn–C TWIP steel by cerium(III) in 1 M hydrochloric acid pickling solution. Mater. Corros. 68, 11 (2017).
22.Bagalà, P., Lamastra, F., Kaciulis, S., Mezzi, A., and Montesperelli, G.: Ceria/stannate multilayer coatings on AZ91D Mg alloy. Surf. Coat. Technol. 206, 23 (2012).
23.Lin, C.S., Lin, H.C., Lin, K.M., and Lai, W.C.: Formation and properties of stannate conversion coatings on AZ61 magnesium alloys. Corros. Sci. 48, 1 (2006).
24.Yin, Z. and Chen, F.: Effect of nickel immersion pretreatment on the corrosion performance of electroless deposited Ni–P alloys on aluminum. Surf. Coat. Technol. 228, 9 (2013).
25.Sidhu, T.S., Prakash, S., and Agrawal, R.D.: State of the art of HVOF coating investigations—A review. Mar. Technol. Soc. J. 39, 2 (2005).
26.Liu, H., Viejo, F., Guo, R.X., Glenday, S., and Liu, Z.: Microstructure and corrosion performance of laser-annealed electroless Ni–W–P coatings. Surf. Coat. Technol. 204, 9 (2010).
27.Ma, C., Wu, F., Ning, Y., Xia, F., and Liu, Y.: Effect of heat treatment on structures and corrosion characteristics of electroless Ni–P–SiC nanocomposite coatings. Ceram. Int. 40, 7 (2014).
28.Ambat, R. and Zhou, W.: Electroless nickel-plating on AZ91D magnesium alloy: Effect of substrate microstructure and plating parameters. Surf. Coat. Technol. 179, 2 (2004).


Microstructure and corrosion resistance of Ni–P gradient coating/stannate conversion film on magnesium alloy

  • Xiao-jia Liu (a1), Wan-chang Sun (a1), Ya-ru Dong (a1), Min Ma (a1), Ya-gang Zhang (a1), Fei Yang (a1) and Yu-yao Ruan (a1)...


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