Directional Electrodeposition of Micro-nano Superhyd-rophobic Coating on 316L Stainless Steel

doi:10.11902/1005.4537.2017.131

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (5): 438-446 DOI: 10.11902/1005.4537.2017.131

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Directional Electrodeposition of Micro-nano Superhyd-rophobic Coating on 316L Stainless Steel

Bin JIANG¹, Lilan ZENG¹, Tao LIANG¹, Haobo PAN², Yanxin QIAO², Jing ZHANG², Ying ZHAO¹(

)

1 Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
2 School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China

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Abstract

A micro-nano superhydrophobic nickel coating was prepared on 316L stainless steel in electrolyte of NiCl₂6H₂O 1 mol/L, H₃BO₃ 0.5 mol/L and ethylenediamine dihydrochloride 0.5~2.5 mol/L via a two-step electrodeposition process, namely, the first electrodeposition was performed by current density of 5 Adm^-2 for 480 s in the electrolyte with 1.5 mol/L crystallization regulator, while the second electrodeposition was conducted by current density of 10 Adm^-2 for 60 s. The prepared micro-nano superhydrophobic coating was characterized by means of surface analysis, electrochemical tests, and contact angle measurements. Results show that the micro-nano superhydrophobic coating presents typical needle-cone array structure with preferential orientation (110) plane and well superhydrophobic performance. With the increasing current density in the second electrodeposion step, the needle-cone array structure transforms gradually in petal-shaped hierarchical structure.

Key words: directional electrodeposition superhydrophobic nickel coating micro-nano hierarchical structure

Received: 02 August 2017

ZTFLH:

TG174.2

Fund: Supported by National Natural Science Foundation of China (81572113, 51501218 and 51401092), Guangdong Natural Science Foundation Doctoral Fund (2014A030310129), Shenzhen Basic Research Project (JCYJ20160608153641020), Shenzhen Peacock Team Project (110811003586331), Shenzhen Hong Kong Innovation Project (SGLH20150213143207910) and Prospective Joint Research Project of Jiangsu Province (BY2016073-12)

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	Bin JIANG
	Lilan ZENG
	Tao LIANG
	Haobo PAN
	Yanxin QIAO
	Jing ZHANG
	Ying ZHAO

Cite this article:

Bin JIANG, Lilan ZENG, Tao LIANG, Haobo PAN, Yanxin QIAO, Jing ZHANG, Ying ZHAO. Directional Electrodeposition of Micro-nano Superhyd-rophobic Coating on 316L Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 438-446.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.131 OR https://www.jcscp.org/EN/Y2018/V38/I5/438

Fig.1 Cyclic voltammetry curves of 316L stainless steel during immersion in the electrolyte with 1.5 mol/L crystallization regulator (5 Adm^-2, 48 C)

Fig.2 E-t curves of 316L stainless steel under the conditions of different first electrodeposition current densities (48 C, 1.5 mol/L)

Fig.3 Surface images of 316L stainless steel after electroplating at the first electrodeposition current densities of 1 Adm^-2 (a), 2 Adm^-2 (b), 5 Adm^-2 (c) and 10 Adm^-2 (d)

Fig.4 Contact angles of 316L stainless steel after electroplating at different first electrodeposition current densities

Fig.5 E-t curves of 316L stainless steel under the conditions of different first electrodeposition time (5 Adm^-2, 1.5 mol/L)

Fig.6 Contact angles for 316L stainless steel after electroplating for different first electrodeposition time

Fig.7 E-t curves of 316L stainless steel under the conditions of different crystallization regulator concentrations (5 Adm^-2, 48 C)

Fig.8 Contact angles for 316L stainless steel under the conditions of different crystallization regulator concentrations

Fig.9 E-t curves of 316L stainless steel under the conditions of different second electrodeposition time (10 Adm^-2, 1.5 mol/L)

Fig.10 Contact angles of 316L stainless steel after electroplating for different second electrodeposition time

Fig.11 Preferred growth direction of 316L stainless steel after electroplating under the various electrodeposition conditions with variations of first electrodeposition time (a), first electrodeposition current (b), concentrations of crystallization regulator (c) and second electrodeposition time (d)

Fig.12 Surface morphologies of 316L stainless steel after electroplating under second electrodeposition optimization condition: (a) three-dimensional morphology, (b) two-dimensional morphology, (c) tip height distribution

Fig.13 Surface element analysis for 316L stainless steel surface after electroplating under second electrodeposition conditions

Fig.14 Electrodeposition growth mechanism of Ni coating with micro-nano hierarchical structure for 316L stainless steel surface after electroplating

Fig.15 Superhydrophobic model for the surface with micro-nano hierarchical structure for 316L stainless steel surface after electroplating

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