High‐speed wire electrical discharge machining to create superhydrophobic surfaces for magnesium alloys with high corrosion and wear resistance,Materials and Corrosion

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High‐speed wire electrical discharge machining to create superhydrophobic surfaces for magnesium alloys with high corrosion and wear resistance
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-06-08 , DOI: 10.1002/maco.202011807
Rongxian Qiu ₁ , Chao Li _{1,

2} , Wei Tong ₃ , Dangsheng Xiong ₃ , Zhongxin Li ₁ , Zhilin Wu ₁

Affiliation

Herein, a superhydrophobic surface of AZ31B magnesium alloy prepared by high‐speed wire electrical discharge machining and modification with stearic acid is reported. The surface morphology and wettability of the superhydrophobic surface were investigated by scanning electron microscopy and optical contact angle measurement, respectively. A uniform micro‐/nanopetal‐like structure was shown within the superhydrophobic surface, resulting in a contact angle of 151 ± 0.5° and a sliding angle of 4 ± 0.5°. Notably, the superhydrophobic surface had better corrosion resistance than the bare magnesium alloy, and its corrosion current density was reduced by nearly one order of magnitude. Under both dry and wet friction conditions, the friction coefficient of the superhydrophobic surface was lower than that of the bare magnesium alloy surface, with a much lower wear loss. In addition, the friction coefficient of the superhydrophobic sample was lower than that of the bare magnesium alloy sample under both the dry and wet friction conditions. Thus, the superhydrophobic sample experienced reduced wear and had a low wear rate.

中文翻译：

高速电火花线切割加工，为具有高腐蚀和耐磨性的镁合金创建超疏水表面

本文报道了通过高速丝放电加工和硬脂酸改性制备的AZ31B镁合金的超疏水表面。通过扫描电子显微镜和光学接触角测量分别研究了超疏水表面的表面形态和润湿性。超疏水表面显示出均匀的微/纳米花瓣状结构，接触角为151±0.5°，滑动角为4±0.5°。值得注意的是，超疏水表面比裸镁合金具有更好的耐腐蚀性，并且其腐蚀电流密度降低了近一个数量级。在干摩擦和湿摩擦条件下，超疏水表面的摩擦系数均低于裸镁合金表面的摩擦系数，磨损损耗低得多。此外，在干摩擦和湿摩擦条件下，超疏水性样品的摩擦系数均低于裸镁合金样品的摩擦系数。因此，超疏水样品的磨损减少并且磨损率低。

更新日期：2020-06-08

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