摘要
钛及钛合金具有比强度高、加工性好、抗冲击震动、耐海水腐蚀及海洋大气腐蚀等优点,使其成为一种优良的船用金属结构材料。但在具有侵蚀性的高浓度氯离子和氟离子的工况下,钛及钛合金易加速腐蚀。此外,高腐蚀电位的钛及钛合金与其他低腐蚀电位金属(如铜、铁)接触时会发生电偶腐蚀,易使其他金属腐蚀失效。目前,可采用多种表面处理方法来提高钛及钛合金的表面耐腐蚀性能以拓展其适用范围。但目前关于钛及钛合金的表面改性研究主要集中在单一表面处理方法对腐蚀性能的影响,鲜见关于复合表面处理后钛及钛合金的耐腐蚀性能研究。采用表面机械研磨处理(SMAT)、磁控溅射以及热氧化处理在工业纯钛(TA2)表面制备了Ru/Ti薄膜,并研究了其在模拟海水中的腐蚀性能。借助X射线衍射仪(XRD)、场发射扫描电子显微镜(FE-SEM)、电化学工作站等仪器对薄膜的物相组成、微观形貌及耐腐蚀性能进行了研究。结果表明,工业纯钛表面获得的Ru/Ti薄膜均匀致密,无明显缺陷,Ru/Ti薄膜中的Ti为α-Ti、fcc-Ti双相结构;与未处理样品相比,具有Ti-Ru薄膜的工业纯钛在模拟海水中的耐蚀性能显著提高。
Titanium and titanium alloys have the advantages of high specific strength,good machinability,resistance to shock and vibration,seawater and marine atmospheric corrosion-resistance,etc.,making them as excellent marine metal structural materials.However,under aggressive high-concentration chloride and fluoride ions working condition,titanium and titanium alloys are liable to accelerate corrosion.In addition,when titanium and titanium alloys with high corrosion potential are in contact with other metals with low corrosion potential such as copper and iron galvanic corrosion will occur,which will easily cause corrosion of other metals.At present,various surface treatment methods can be used to improve the surface corrosion resistance of titanium and titanium alloys in order to expand their scope of application.However,the previous studies on the surface modification of titanium and titanium alloys mainly focused on the influence of a single surface treatment method on the corrosion performance.There are a few researches on the corrosion resistance of titanium and titanium alloys under a hybrid surface treatment method.The Ru/Ti films on the surface of industrial pure titanium(TA2)was prepared by surface mechanical polishing(SMAT),magnetron sputtering and thermal oxidation treatment,and to study their corrosion properties in simulated seawater.The X-ray diffractometer(XRD),field emission scanning electron microscope(FE-SEM),and electrochemical workstation were used to study the phase composition,surface morphologies,and corrosion resistance of the films.The results showed that the Ru/Ti film obtained on the surface of industrial pure titanium was uniform and dense without obvious defects.The Ti in the Ru/Ti film exhibited anα-Ti and fcc-Ti dual-phase structure.The corrosion resistance of thin film of indust-rial pure titanium in simulated seawater was significantly improved.
作者
余登德
张仁耀
沈月
闻明
刘洪喜
YU Dengde;ZHANG Renyao;SHEN Yue;WEN Ming;LIU Hongxi(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,Kunming Institute of Precious Metals,Kunming 650106,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第24期24086-24091,共6页
Materials Reports
基金
国家自然科学基金(51564025)
云南省自然科学基金(2017FA029)。
关键词
表面机械研磨处理
磁控溅射
热氧化
Ru/Ti薄膜
工业纯钛
耐蚀性
surface mechanical attrition treatment
magnetron sputtering
thermal oxidation
Ru/Ti film
commercial pure titanium
corrosion resistance
