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

发布时间：2018-03-04 00:22

本文选题：选择性激光熔覆技术　切入点：铸造技术　出处：《华西口腔医学杂志》2016年01期 　论文类型：期刊论文

【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(p H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(P0.05),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(P0.05)。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。
[Abstract]:Objective to study the effect of fluorine ion on corrosion resistance of cobalt-chromium alloy fabricated by selective laser cladding (SLM) technique and traditional casting technology in simulated oral environment. Methods Cobalt chromium alloy with the same material composition was selected. Gold metal powder and metal block, SLM(SLM group and cast cast group were used to make 15 specimens, respectively. The samples were immersed in acidic artificial saliva (pH = 5.0) with different fluorine ion mass fraction (0.20%) for 24 h. The self-corrosion potential (Ecorr), corrosion current density (Icorr) and polarization resistance (RP) of the alloy were measured by potentiodynamic polarization curve method. Results the Ecorr of Co-Cr alloy in acidic artificial saliva decreased with the increase of fluorine ion mass fraction. When the fluorine ion mass fraction was 0.20%, the corrosion resistance of the two groups of specimens was analyzed. The results of Ecorrn Icorrn rp of the two processes also showed that corrosion was observed on the surface of the alloy. The Icorr of the cast cobalt chromium alloy was higher than that of the SLM group when the fluorine ion mass fraction was 0.20. However, Ecorr and RP are lower than that of SLM group (P 0.05). Conclusion the corrosion resistance of cobalt-chromium alloy made by fluorine ion can be reduced, and the corrosion resistance of cobalt-chromium alloy made by Ecorr technology is better than that of cobalt-chromium alloy made by casting process when the mass fraction of fluorine ion is higher than 0.20%.
【作者单位】：九江学院附属口腔医院修复科;南昌大学附属口腔医院修复科;九江市第一人民医院口腔颌面外科;
【分类号】：R783.1

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