摘要
通过激光表面织构和低温热处理技术,提高TC4钛合金的耐腐蚀性能。采用激光织构方法制备具有周期性微结构的超润湿(超亲水/超疏水)钛合金表面,采用扫描电子显微镜(SEM)及能谱仪(EDS)对未处理表面和织构表面的形貌、元素及其相对含量进行分析和表征;采用电化学工作站,对未处理表面、超亲水表面以及超疏水表面进行电化学腐蚀实验。经测量超亲水表面的接触角为0°,超疏水表面的可达155°±2.9°;超疏水表面具有较低的腐蚀电流密度和较高的自腐蚀电位,且在织构间距为150μm时、腐蚀电流密度(I_(corr))从12.097μA/cm^(2)降至0.68167μA/cm^(2),腐蚀电位(E_(corr))值从-0.5710 V增加到-0.3994 V,与未处理表面相比,耐蚀性提升94.4%;超疏水表面电化学阻抗谱EIS具有更大的电容环直径和更高的阻抗幅值,所以它对保护基体不被腐蚀破坏起到一定的作用。结果表明:激光表面织构超疏水表面可明显地提高材料的耐腐蚀性能,可较好地保护钛合金基体。
The corrosion resistance of TC4 titanium alloy was improved by laser surface texturing and low temperature heat treatment technology.Ultrawet(ultrahydrophilic/ultrahydrophobic)titanium alloy surfaces with periodic microstructure were prepared by laser texturing method.The morphologies and elements of the untreated and textured surfaces and the relative contents of the elements were analyzed and characterized by scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).Electrochemical corrosion experiments were carried out on untreated surface,superhydrophilic surface and superhydrophobic surface with electrochemical workstation.The results show that the contact angle of the superhydrophilic surface is 0°,and the contact angle of the superhydrophobic surface can reach 155°±2.9°.The corrosion current density(I_(corr))of the superhydrophbic surface decreased from 12.097μA/cm^(2)to 0.68167μA/cm^(2),and the corrosion potential(E_(corr))increased from-0.5710 V to-0.3994 V when the texture spacing was 150μm.Compared with untreated surfaces,the corrosion resistance of the superhydrophibic surface was improved by 94.4%.The electrochemical impedance spectroscopy(EIS)of the superhydrophobic surface has a larger capacitance ring diameter and a higher impedance amplitude,so it plays a certain role in protecting the matrix from corrosion.Laser texturing superhydrophobic surface can obviously improve the corrosion resistance of the material,and can better protect the titanium alloy matrix.
作者
张明鲲
王新辉
梁治国
赵祥
宋金朋
王治国
ZHANG Mingkun;WANG Xinhui;LIANG Zhiguo;ZHAO Xiang;SONG Jinpeng;WANG Zhiguo(Xianyang Special Equipment Inspection Institute,Xianyang,Shaanxi 712099,China;College of Mechanical Engineering,Xi’an Shiyou University,Xi’an,Shaanxi 710065,China;Key Laboratory of Xi’an City for Wellbore Integrity Evaluation,Xi’an,Shaanxi 710065,China)
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2023年第5期111-117,126,共8页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
陕西省市场监督管理局科技计划(2021KY16)。
关键词
钛合金
激光织构
超润湿
超疏水表面
耐蚀性
titanium alloy
laser texture
super wetting
super hydrophobic surface
corrosion resistance
