摘要
本文以Na2SiO3为基础电解液体系,加入一定量的CaCl2及MgCl2,对Ti6Al4V合金表面进行微弧氧化,研究CaCl2及MgCl2的加入对Ti6Al4V合金表面微弧氧化膜形成过程及其特性的影响规律。试验结果表明:CaCl2及MgCl2加入量从0.05g/L增加到0.35 g/L的过程中,正向起弧电压分别从350V增加至358V、330V增加至369V。SEM形貌分析显示,随着电解液中CaCl2的加入量增加,氧化膜层表面的孔洞减少,膜层表面出现直径约为5μm的颗粒状陶瓷,膜层变得疏松;MgCl2的加入量增加,氧化膜表面孔洞减少。EDS分析结果显示加入CaCl2、MgCl2的电解液中获得的膜层组成元素分别是Ti、Na、Al、Si、P、O,与基础电解液体系相比较,Ca元素有所增加,Mg元素变化不明显。XRD分析结果表明,CaCl2加入到电解液中出现了更多的金红石相TiO2的衍射峰;MgCl2加入电解液中之后,锐钛矿相TiO2有所增加。
In Na2SiO3 electrolyte system contained a certain amount of CaCl2 or MgCl2,ceramic coating were prepared on the surface of Ti6Al4V alloy by micro-arc oxidation in this work.The effects of CaCl2/MgCl2 in the base electrolyte system on the formation and characteristics of coatings were investigated.The results show that the arc starting forward voltages increase from 350V to 358V with the increase of CaCl2 from 0.05 g/L to 0.35 g/L in the electrolyte.Similarly,for the increase of MgCl2 from 0.05 g/L to 0.35 g/L,the arc starting voltages increase from 330V to 369V.It is found by SEM that the amount of pores in the alloy surfaces decreases with the increase of CaCl2 in the electrolyte and many ceramic particles,5μm in diameter,exist on the surfaces of the coatings.The surfaces of the coatings become looser.The amount of pores in the alloy surfaces also decreases with the increase of MgCl2 in the electrolyte.The results of EDS analysis indicate that there are Ti,Na,Al,Si,P and O in the coatings formed in the electrolytes containing CaCl2 or MgCl2.The amount of Ca element in the coatings formed in the electrolytes containing CaCl2 or MgCl2 increases slightly but there is not obvious variation in the amount of Ca element,comparing with that of the coatings formed in the base electrolyte.The results of XRD analysis show that anatase phase TiO2 in the coatings increases with the increase of CaCl2,but rutile phase TiO2 increases while CaCl2 is added to the electrolyte.
出处
《陶瓷学报》
CAS
北大核心
2011年第1期81-86,共6页
Journal of Ceramics
