316L不锈钢表面超疏水微纳镍镀层定向电沉积工艺优化研究

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

利用定向电沉积技术在316L不锈钢表面设计制备了一种超疏水微纳镍镀层,通过对电沉积参数的优化,获得最佳电沉积工艺参数:初次电沉积电流密度5 A·dm^(-2),电沉积时间为480 s,结晶调节剂浓度为1.5 mol/L;二次电沉积条件为10 A·dm^(-2),60s。借助SEM、XRD、电化学测试技术、接触角测试对涂层进行表征,结果表明制备的316L不锈钢表面镍镀层阵列微纳结构具有典型的花瓣状分级结构和较好的超疏水性能,镍镀层阵列微纳结构由具有(110)择优取向晶面的针锥阵列结构组成,随着二次电沉积电流密度的增大,镍镀层阵列微纳结构的生长经历从针锥向花瓣结构转变。

A micro-nano superhydrophobic nickel coating was prepared on 316 L stainless steel in electrolyte of NiCl_2·6H_2O 1 mol/L, H_3BO_3 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 A·dm^（-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 A·dm^（-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.