Corrosion resistance of titanium-silver alloys in an artificial saliva containing fluoride ions.
Corrosion resistance of titanium-silver alloys in an artificial saliva containing fluoride ions.
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DOI：
10.1002/jbm.b.30206
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发表时间：
2005-05
期刊：
影响因子：
--
通讯作者：
Hyung-Min Shim;K. Oh;Jae-Young Woo;C. Hwang;Kyoung-Nam Kim
中科院分区：
文献类型：
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作者：
Hyung-Min Shim;K. Oh;Jae-Young Woo;C. Hwang;Kyoung-Nam Kim
用于防龋剂的牙凝胶和含氟液的浓度从0.1%到1%不等。此外，许多类型的氟化物释放材料已被用于牙科应用。研究了人工唾液中添加氟化物对纯钛及钛银合金耐蚀性的影响。钛及钛银合金经电弧炉熔炼，在950℃下均质化72h，热轧，固溶热处理后淬火。为了研究氟离子对人工唾液耐蚀性的影响，采用动电位极化测试、恒电位测试和开路电位测试方法，对纯净人工唾液和添加0.1%和1%NaF的人工唾液进行了电化学测试和开路测试。钛及钛银合金的钝化电流密度随着氟离子浓度的增加而增大。与钛相比，Ti2.0Ag和Ti3.0Ag表现出相对较低的电流密度和稳定的行为。钛的开路电位随氟浓度的增加而降低，250 mV的电流密度(SCE)恒电位法反应灵敏。另一方面，高银含量(3.0-4.0at%)钛银合金的开路电位对氟离子浓度的反应不太敏感。在钛银合金中，Ti3.0Ag合金具有更高的抗氟离子侵蚀能力，在含氟溶液中表现出比钛更稳定的开路电位和电流密度。结果表明，它们电化学性能稳定，在含氟人工唾液中具有良好的耐腐蚀性。
Dental gels and rinses for caries prophylactic contain fluoride at concentrations ranging from 0.1 to 1%. In addition, many types of fluoride-releasing materials have been used in dental applications. The purpose of the study was to investigate the addition effect of fluoride into artificial saliva on the corrosion resistance of pure titanium and titanium-silver alloys. Titanium and titanium-silver alloys were arc melted, homogenized at 950 degrees C for 72 h, hot rolled, and solution heat treated and quenched. In order to investigate the effect of the fluoride ions on the corrosion resistance, potentiodynamic polarization testing, potentiostatic testing, and open-circuit potential measurements were performed in plain artificial saliva and 0.1 and 1% NaF-added artificial saliva. The passive current densities of titanium and titanium-silver alloys increased with increasing fluoride-ion concentration. Ti2.0Ag and Ti3.0Ag exhibited a low current density relatively and showed a stable behavior compared to titanium. The open-circuit potential of titanium decreased and current density at 250 mV (SCE) potentiostatic testing reacted sensitively with increasing fluoride concentration. On the other hand, the open-circuit potential of titanium-silver alloys with a high silver content (3.0-4.0 at %) reacted less sensitively to the fluoride-ion concentration. Among titanium-silver alloys, Ti3.0Ag alloy had a higher resistance against the attack of fluoride ions and showed a more stable open-circuit potential and current density than titanium in the fluoride-containing solution. It is concluded that they are electrochemically stable and maintained good corrosion resistance in fluoride-containing artificial saliva.