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首页> 外文期刊>The Journal of Prosthetic Dentistry >Use of x-ray photoelectron spectroscopy and cyclic polarization to evaluate the corrosion behavior of six nickel-chromium alloys before and after porcelain-fused-to-metal firing.
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Use of x-ray photoelectron spectroscopy and cyclic polarization to evaluate the corrosion behavior of six nickel-chromium alloys before and after porcelain-fused-to-metal firing.

机译：使用X射线光电子能谱和循环极化来评估六种镍铬合金在陶瓷熔融金属烧制前后的腐蚀行为。

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STATEMENT OF PROBLEM: Nickel-chromium casting alloys rely on a surface oxide layer for corrosion resistance to the oral environment. Porcelain-fused-to-metal (PFM) firing procedures may alter the surface oxides and corrosion properties of these alloys. Changes in alloy corrosion behavior affect metal ion release and therefore local and/or systemic tissue responses. PURPOSE: The aim of this study was to evaluate changes in alloy surface oxides and electrochemical corrosion properties after PFM firing. MATERIAL AND METHODS: The electrochemical corrosion behavior of 6 commercial nickel-chromium alloys was evaluated in the as-cast/polished and PFM fired/repolished states. Surface chemistries of the alloys were analyzed by x-ray photoelectron spectroscopy. RESULTS: Results indicated an increase in corrosion rates after PFM firing and repolishing for alloys containing 14% to 22% Cr and 9% to 17% Mo. This increase in corrosion rates was attributed to a decrease, caused by the PFM and repolishing process, in the Cr and Mo levels in the surface oxides of these alloys. The PFM firing and repolishing process did not alter the corrosion behavior of the alloys containing lower levels of Cr and Mo and/or Be additions in their bulk composition. These alloys exhibited low levels of Cr and Mo surface oxides in both test conditions. Si particles became embedded in the surfaces of the fired alloys during repolishing and may have contributed to the changes in surface oxides and the corrosion behavior of some alloys. CONCLUSION: The effects of PFM firing and repolishing on Ni-Cr dental casting alloy surface oxides and corrosion properties appear to be alloy dependent.
机译：问题陈述：镍铬铸造合金依靠表面氧化物层来抵抗口腔环境的腐蚀。瓷熔金属烧制程序可能会改变这些合金的表面氧化物和腐蚀性能。合金腐蚀行为的变化会影响金属离子的释放，从而影响局部和/或全身组织的反应。目的：本研究的目的是评估PFM焙烧后合金表面氧化物的变化和电化学腐蚀性能。材料与方法：评价了6种市售镍铬合金在铸态/抛光态和PFM烧结/抛光态下的电化学腐蚀行为。通过X射线光电子能谱分析了合金的表面化学。结果：结果表明，含有14％至22％Cr和9％至17％Mo的合金在PFM焙烧和再抛光后，腐蚀速率增加。这种腐蚀速率的增加归因于PFM和再抛光工艺的降低，这些合金的表面氧化物中的Cr和Mo含量较低。 PFM焙烧和再抛光工艺不会改变整体成分中含有较低含量的Cr和Mo和/或Be的合金的腐蚀行为。这些合金在两种测试条件下均表现出低水平的Cr和Mo表面氧化物。 Si颗粒在再抛光过程中被嵌入到烧结合金的表面，并且可能导致表面氧化物的变化和某些合金的腐蚀行为。结论：PFM焙烧和再抛光对Ni-Cr牙科铸造合金表面氧化物和腐蚀性能的影响似乎与合金有关。

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