Vitallium 2000+钴铬钼合金和纯钛在不同人工唾液中耐腐蚀性的评价

Evaluation on corrosion resistance of Vitallium 2000 plus Co-Cr-Mo alloy and pure titanium in different artificial saliva

目的评价Vitallium 2000+钴铬钼合金和纯钛对不同氟浓度和溶解氧浓度的耐腐蚀性。方法采用ZahnerIM6e型电化学工作站及THALESanalysis软件测得金属试件在不同人工唾液中的动电位极化曲线,并得到自腐蚀电位(Ecorr)、自腐蚀电流密度(Icorr)和极化电阻(Rp)等指标。结果在酸性、溶解氧浓度(DO)≥8.1 ppm的人工唾液中加入0.05%F-,纯钛试件极化曲线上移,Icorr增大,Rp减小(P﹤0.05),而Vitallium试件极化曲线没有偏移,Icorr、Rp基本不变(P﹥0.05);当F-浓度增大到0.2%,纯钛和Vitallium试件极化曲线均上移,Icorr增大,Rp减小(P﹤0.05)。当纯钛和Vitallium试件处于无氧状态(DO≤0.1 ppm),极化曲线均上移,Icorr增大,Rp减小(P﹤0.05)。结论低浓度氟不会影响Vitallium 2000+钴铬钼合金的耐腐蚀性,但会降低纯钛的耐腐蚀性;高浓度氟和低溶解氧均会降低两者的耐腐蚀性。

Objective To evaluate the corrosion resistance of Vitallium 2000 plus Co-Cr-Mo alloy and pure titanium in artificial saliva with different fluoride and dissolved-oxygen concentrations. Methods ZahnerlM6e electrochemical workstation and THALES analysis software were applied to measure the polarization curves of the metal specimens in different artificial saliva, and indicators like the Ecorr Icorr and Rr, were acquired. Results In 0.05 % F ^- , DO I〉 8.1 ppm acidic artificial saliva, polarization curves of titanium specimen shifted up,Icorr increased and Rp decreased （P 〈 0.05 ） ; however, polarization curves of Vitallium specimen didn＇t offset shift, while Icorr and Rp didn＇t change basically （ P 〉 0.05 ）. When the F - concentration was increased to 0.2 % , the polarization curves of both titanium and Vitallium test pieces shifted up, Icorr increased and Rp decreased （ P 〈 0.05）. When DO ≤0.1 ppm, the polarization curves of both titanium and Vitallium test pieces shifted, leo~ increased and Rp decreased （ P 〈 O. 05 ）. Conclusions Low concentrations of fluorine will not affect the corrosion resistance of Vitallium 2000 plus Co-Cr-Mo alloy, but they can reduce the corrosion resistance of pure titanium. High concentrations of fluorine and low concentrations of oxygen will reduce the corrosion resistance of Vitallium 2000 plus Co-Cr-Mo alloy and titanium.