华西口腔医学杂志

• 临床研究 • 上一篇    下一篇

氟离子对两种不同工艺制作的钴铬合金耐腐蚀性能的影响

杨秋霞1  杨瑛2  徐晗1  吴迪3  郭恪1   

  1. 1.九江学院附属口腔医院修复科,九江 332000;2.南昌大学附属口腔医院修复科,南昌 330006;3.九江市第一人民医院口腔颌面外科,九江 332000
  • 出版日期:2016-02-01 发布日期:2016-02-01
  • 通讯作者: 杨瑛,主任医师,学士,E-mail:yangying27@tom.com
  • 作者简介:杨秋霞,硕士,E-mail:15879016067@163.com

Effect of fluoride concentration on the corrosion behavior of cobalt-chromium alloy fabricated by two different technology processes

Yang Qiuxia1, Yang Ying2, Xu Han1, Wu Di3, Guo Ke1   

  1. 1. Dept. of Prosthodontics, Jiujiang University Affiliated Stomatological Hospital, Jiujiang 332000, China; 2. Dept. of Prosthodontics, Affiliated Stomatological Hospital of Nanchang University, Nanchang 330006, China; 3. Dept. of Oral and Maxillofacial Surgery, The First People's Hospital of Jiujiang, Jiujiang 332000, China
  • Online:2016-02-01 Published:2016-02-01

摘要:

目的  在模拟口腔环境下研究氟离子对采用选择性激光熔覆(SLM)技术和传统铸造技术两种工艺制作的钴铬合金耐腐蚀性的影响。方法  选择具有相同材料成分的钴铬合金金属粉末和金属块,分别采用SLM(SLM组)和铸造技术(Cast组)各制作15个试件,置于含不同氟离子质量分数(0、0.05%、0.20%)的酸性人工唾液(pH值为5.0)中浸泡24 h进行电化学试验,采用动电位极化曲线法测试合金的自腐蚀电位Ecorr、自腐蚀电流密度Icorr和极化电阻Rp,同时结合扫描电子显微镜(SEM)观察,分析两组试件的耐腐蚀性能。结果  铸造工艺制作的钴铬合金在酸性人工唾液中的Ecorr随着氟离子质量分数的升高而减小。当氟离子质量分数为0.20%时,两种工艺制作的钴铬合金的Ecorr、Icorr、Rp均有明显改变(P<0.05),SEM结果也显示合金表面均出现腐蚀现象。当氟离子质量分数为0.20%时,Cast组钴铬合金的Icorr高于SLM组,而Ecorr和Rp低于SLM组(P<0.05)。结论  氟离子可降低两种工艺制作的钴铬合金的耐腐蚀性,在氟离子质量分数较高(0.20%)时,SLM技术制作的钴铬合金的耐腐蚀性优于铸造工艺制作的钴铬合金。

关键词: 选择性激光熔覆技术, 铸造技术, 钴铬合金, 氟离子, 耐腐蚀性

Abstract:

Objective  This study aims to determine the effect of fluoride concentration on the corrosion behavior of cobaltchromium alloy fabricated by two different technology processes in a simulated oral environment. Methods  A total of 15 specimens were employed with selective laser melting (SLM) and another 15 for traditional casting (Cast) in cobalt-chromium alloy powders and blocks with the same material composition. The corrosion behavior of the specimens was studied by potentiodynamic polarization test under different oral environments with varying solubilities of fluorine (0, 0.05%, and 0.20% for each) in acid artificial saliva (pH=5.0). The specimens were soaked in fluorine for 24 h, and the surface microstructure was observed under a field emission scanning electron microscope after immersing the specimens in the test solution at constant temperature. Results  The corrosion potential (Ecorr) value of the cobalt-chromium alloy cast decreased with increasing fluoride concentration in acidic artificial saliva. The Ecorr, Icorr, and Rp values of the cobalt-chromium alloy fabricated by two different technology processes changed significantly when the fluoride concentration was 0.20% (P<0.05). The Ecorr, Icorr, and Rp values of the cobalt-chromium alloy fabricated by two different technology processes exhibited a statistically significant difference. The Icorr value of the cobalt-chromium alloy cast was higher than that in the SLM group cobalt-chromium alloy when the fluoride concentration was 0.20% (P<0.05). The Ecorr and Rp values of the cobalt-chromium alloy cast were lower than those of the SLM group cobalt-chromium alloy when the fluoride concentration was 0.20% (P<0.05). Conclusion  Fluoride ions adversely affected the corrosion resistance of the cobalt-chromium alloy fabricated by two different technology processes. The corrosion resistance of the cobalt-chromium alloy cast was worse than that of the SLM group cobalt-chromium alloy when the fluoride concentration was 0.20%.

Key words: selective laser melting, casting technique, cobalt-chromium alloy, fluoride ions, corrosion resistance