Surface & Coatings Technology ( IF 5.4 ) Pub Date : 2020-09-09 , DOI: 10.1016/j.surfcoat.2020.126404 Fan Zhang , Zhengjun Yao , Oleksandr Moliar , Zelei Zhang , Xuewei Tao
Using the principle of electrochemical additive manufacturing (ECAM), a nanocrystalline NiCo binary alloy coating was prepared on the surface of the steel substrate. This study shows the pulse-shaped current-time curve of ECAM during the coating preparation process, and the nanocrystalline NiCo coating has a regular multilayer structure. At the same time, the ECAM method can effectively limit the growth time of the crystal nucleus and prepare nanocrystalline NiCo alloy coatings with ultra-low energy consumption (5.75 × 10−3 W). Besides, as the content of Co in the coating increases, the NiCo alloy coating changes from an FCC single-phase structure to an FCC + HCP multi-phase structure. Finally, through the performance test of the nanocrystalline NiCo coating, it is concluded that as the content of Co in the coating increases, the hardness of the coating increases, and the coating surface has a certain degree of hydrophobicity (100°–114°). The electrochemical corrosion test shows that the NiCo coating has better corrosion resistance than the steel substrate. As the content of Co in the coating increases, the corrosion current density of the NiCo coating increases from 9 μA/cm2 to 32 μA/cm2.
中文翻译:
电化学增材制造超低功率制备多层纳米晶Ni Co二元合金涂层
使用电化学增材制造(ECAM)原理,在钢基底表面上制备了纳米晶Ni Co二元合金涂层。这项研究显示了在涂层制备过程中ECAM的脉冲状电流-时间曲线,并且纳米晶Ni Co涂层具有规则的多层结构。同时,ECAM方法可以有效地限制晶核的生长时间,并制备具有超低能耗(5.75×10 -3 W)的纳米晶Ni Co合金涂层。此外,随着涂层中Co含量的增加,Ni Co合金涂层从FCC单相结构变为FCC + HCP多相结构。最后,通过纳米晶镍的性能测试得出结论,Co涂层随着涂层中Co含量的增加,涂层的硬度也增加,并且涂层表面具有一定程度的疏水性(100°–114°)。电化学腐蚀测试表明,Ni Co涂层比钢基材具有更好的耐腐蚀性。随着涂层中Co含量的增加,Ni Co涂层的腐蚀电流密度从9μA/ cm 2增加到32μA/ cm 2。