载荷和电位对Ti-6Al-3Nb-2Zr-1Mo合金在海水中腐蚀磨损行为的影响  

Influence of Load and Electrode Potential on the Tribocorrosion Behavior of Ti-6Al-3Nb-2Zr-1Mo Alloy in Seawater

作　　者：谢浩民 李光明[3] 胡凌越 毛飞雄 宫克 XIE Haomin;LI Guangming;HU Lingyue;MAO Feixiong;GONG Ke(School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,Zhejiang,China;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,Zhejiang,China;Wuhan Second Ship Design and Research Institute,Wuhan 430064,China)

机构地区：[1]宁波大学材料科学与化学工程学院,浙江宁波315211 [2]中国科学院宁波材料技术与工程研究所,浙江宁波315201 [3]武汉第二船舶设计研究所,武汉430064

出　　处：《材料导报》2025年第6期201-211,共11页Materials Reports

基　　金：国家重点研发计划(2022YFC3103803);中国科学院国际合作项目(174433KYSB2020006);宁波市重点科技项目(2021Z079)。

摘　　要：Ti-6Al-3Nb-2Zr-1Mo(Ti80)合金是一种专为海洋工程应用而设计的近α钛合金,广泛用于各类海工装备的受力构件、螺栓、轴及耐压耐蚀壳体。在海洋环境下作为运动部件时,Ti80不可避免地会发生腐蚀磨损,但目前鲜有对其腐蚀磨损性能及腐蚀磨损交互作用的研究报道。本工作通过力学-电化学结合的方法研究了载荷和电极电位对Ti80合金在人造海水中腐蚀磨损行为的影响,采用金相显微镜、3D光学轮廓仪、SEM、XRD、XPS、维氏硬度计等测试手段对材料磨损区域进行微观形貌表征、表面成分鉴定和硬度变化等测试。在人工海水中,Ti80的腐蚀电位由静态的-276 mV下降至摩擦条件(15 N)下的-551 mV,腐蚀电流密度由静态下的0.3630μA/cm^(2)增大到摩擦条件(15 N)下的12.5545μA/cm^(2),摩擦磨损不仅改变了Ti80的腐蚀倾向并显著加速了材料腐蚀。交互作用分析表明,协同作用中腐蚀加速磨损量占比可达到60.38%,证明腐蚀对磨损的促进作用更加明显,但纯机械磨损损失始终主导总材料损失(>70%)。本工作可为预测Ti80合金部件安全服役寿命提供理论与数据支持。Ti-6Al-3Nb-2Zr-1Mo(abbreviated as Ti80)alloy is a type of near-αTi alloy specially designed for marine applications and is widely used in stress members,bolts,shafts and pressure and corrosion resistant housings for all types of offshore equipment.When used as a moving part in the marine environment,Ti80 inevitably undergoes tribocorrosion,but few studies have been reported on its tribocorrosion properties and the synergism between corrosion and wear.In this work,a method combining mechanics and electrochemistry was used to study the effects of load and electrode potential on the tribocorrosion properties of Ti80 alloy in artificial seawater.Metallographic microscopy,3D optical profilometer,SEM,XRD,XPS,and Vickers hardness tester were used to characterize the microstructure,identify the surface composition,and determine the hardness changes of the worn area.In artificial seawater,the corrosion potential of Ti80 decreased from-276 mV under static condition to-551 mV under frictional condition(15 N),and the corrosion current density increased from 0.3630μA/cm^(2)under static condition to 12.5545μA/cm^(2)un-der friction condition(15 N).Friction and wear not only altered the corrosion tendency of Ti80 but also significantly accelerated the corrosion rate.Synergism analysis showed that the proportion of corrosion-accelerated wear component in the synergistic effect can reach 60.38%,indicating that corrosion has a more significant promoting effect on wear.However,the pure mechanical wear loss always dominated the total material loss(>70%).This work can provide theoretical and data support for predicting the safe service life of Ti80 alloy components.

关 键 词：Ti80合金 腐蚀磨损 电化学 交互作用 

分 类 号：TG172[金属学及工艺—金属表面处理] TG117[金属学及工艺—金属学]