等离子渗氮和镀膜复合处理后纯钛耐腐蚀性能研究  

Corrosion resistance of casted titanium by compound treatments in the artificial saliva with different fluoride concentrations

作　　者：王献利[1] 郭天文[1] 

机构地区：[1]第四军医大学口腔医学院修复科,西安710032

出　　处：《中华口腔医学杂志》2012年第9期557-561,共5页Chinese Journal of Stomatology

基　　金：国家自然科学基金（30171022）

摘　　要：目的通过研究等离子渗氮和镀膜复合氮化处理后纯钛在含不同质量浓度氟的人工唾液中的耐腐蚀性能，探讨复合氮化处理能否提高纯钛的耐蚀性，以期为表面改性技术在口腔的应用提供参考。方法用动电位极化法描绘复合处理组和未处理组纯钛铸件在氟离子质量浓度为0、500及2000mg／L的人工唾液中的极化曲线，得出自腐蚀电流密度和自腐蚀电位，并进行双因素方差分析。扫描电镜观察各组试件表面形貌。结果未处理组和复合处理组纯钛铸件在氟离子为0、500、2000mg／L的人工唾液中的自腐蚀电流密度分别为（1530．23±340．12）、（2290．36±320．10）、（4130．52±230．17）和（2．62±0．64）、（7．37±3．59）、（10．76±6．05）nA，自腐蚀电位分别为（-0．93±0．10）、（-0．89±0．21）、（-0．57±0．09）和（-0．21±0．04）、（-0．17±0．03）、（-0．22±0．03）V。复合氮化处理后纯钛铸件的自腐蚀电流密度明显降低（P〈0．01），而不断增加的氟离子质量浓度使复合处理组和未处理组的自腐蚀电流密度逐渐增大（P〈0．01）。复合处理后纯钛铸件的自腐蚀电位明显增大（P〈0．01）。扫描电镜显示，复合处理组纯钛的腐蚀较未处理组明显减轻。随氟离子质量浓度的增加，两组试件表面腐蚀均加重。结论等离子渗氮和镀膜复合氮化处理能明显提高纯钛在人工唾液中的耐蚀性。逐渐增大的氟离子质量浓度使复合处理组和未处理组纯钛的耐蚀性降低。Objective To study the corrosion resistance of casted titanium by plasma nitriding and TiN-coated compound treatments in the artificial saliva with different fluoride concentrations and to investigate whether compound treatments can increase the corrosion resistance of casted titanium. Methods Potentiodynamic polarization technique was used to depict polarization curve and to measured the current density of corrosion（Icon＇） and the electric potential of corrosion（Ecorr） of casted titanium（ Group A） and casted titanium by compound treatments （Group B ） in the artificial saliva with different fluoride concentrations. After electrochemical experiment, the microstructure was observed by scanning electron microscope（SEM）. Results The Icorrs of Group A and B in the artificial saliva of different fluoride concentrations were （ 1530. 23 ± 340. 12 ）, （ 2290. 36 ± 320. 10 ）, （4130. 52± 230. 17 ） nA and （ 2. 62± 0.64）, （7.37 ± 3.59）, （10.76 ±6. 05） nA, respectively. The Ecorrs were （ - 0.93 ± 0.10）, （-0.89±0.21）, （-0.57±0.09）V and （-0.21 ±0.04）, （-0.17±0.03）, （-0.22±0.03）V, respectively. The Icorrs of Group B were significantly lower （ P 〈 0. 01 ） than that of Group A. The Icon＇s increased significantly with the increasing of fluoride concentrations（ P 〈 0. 01 ）. The Ecorrs of Group B were significantly higher than that of Group A（P 〈0. 01 ）. The SEM confirmed the microstructure in the casted titanium was much severely than that in Group B, the microstructure in Group A and B corroded more and more heavily with increasing of fluoride concentrations. Conclusions The increase of fluoride concentrations influence the corrosion resistance of both treated and untreated casted titanium negatively, but plasma nitriding and TiN-coated compound treatments can significantly increase the corrosion resistance of casted titanium.

关 键 词：钛 氟 腐蚀 等离子渗氮 镀膜 

分 类 号：R783.6[医药卫生—口腔医学]