Li Sishi, Song Gongsheng, Zhang Yupeng, Fu Qiang, Pan Chunxu
School of Physics and Technology, and MOE Key Laboratory of Artificial Micro- and Nano-structures, Wuhan University, Wuhan 430072, China.
Institute of Microscale Optoelectronics, Shenzhen Key Laboratory of Flexible Memory Materials and Devices, Shenzhen University, Shenzhen 518000, China.
ACS Omega. 2021 May 17;6(21):13728-13741. doi: 10.1021/acsomega.1c00977. eCollection 2021 Jun 1.
In this paper, a novel kind of graphene (Gr)-reinforced Zn-Ni alloy composite coating is successfully prepared on an iron substrate by pulsed reverse electrodeposition. Hydrophilic graphene oxide (GO) is directly added to the electrolyte and reduced to Gr during coating. The experimental results reveal that (1) there is an optimal adding amount (about 0.4 g/L) of GO in the electrolyte for achieving the highest mechanical properties and corrosion resistance; (2) the composite coating shows grain refinement and a dense microstructure due to heterogeneous nucleation sites provided from the Gr sheets during electrodeposition; and (3) compared to the regular Zn-Ni coating, the composite coating exhibits many enhancements, including hardness increase by 2.3 times, elastic modulus increase by 39%, and corrosion rate decrease from 37.66 to 1.30 mils/annum. This process has advantages such as being simple, effective, well repeatable, economical, and supporting large-scale production and is expected to be widely applied in electronics, automobiles, marine engineering, and military industries.
本文通过脉冲反向电沉积法在铁基体上成功制备了一种新型的石墨烯（Gr）增强Zn-Ni合金复合涂层。将亲水性氧化石墨烯（GO）直接添加到电解液中，并在涂层过程中还原为Gr。实验结果表明：（1）电解液中存在一个最佳的GO添加量（约0.4 g/L），以实现最高的力学性能和耐腐蚀性；（2）由于电沉积过程中Gr片提供的异质形核位点，复合涂层呈现出晶粒细化和致密的微观结构；（3）与常规Zn-Ni涂层相比，复合涂层表现出许多增强性能，包括硬度提高2.3倍、弹性模量提高39%以及腐蚀速率从37.66密耳/年降至1.30密耳/年。该工艺具有简单、有效、重复性好、经济且支持大规模生产等优点，有望在电子、汽车、海洋工程和军事工业中得到广泛应用。
