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首页> 外文会议>European corrosion congress;EUROCORR 2009 >Assessment of the corrosion behaviour of Nd-Fe-B magnets used in dentistry treated by coatings of phosphate, Cr~(3+) and silane
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Assessment of the corrosion behaviour of Nd-Fe-B magnets used in dentistry treated by coatings of phosphate, Cr~(3+) and silane

机译：牙科用磷酸盐，Cr〜（3+）和硅烷涂层处理的Nd-Fe-B磁体的腐蚀行为评估

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The aim of this work is to evaluate by electrochemical methods the effectiveness of the corrosion protection afforded by three different surface treatments: phosphate conversion, non-functional silane (BTSE) layer and conversion treatment with Cr~(3+) to commercial sintered Nd-Fe-B magnets used in dentistry. The electrochemical tests were performed in a phosphate buffered solution (PBS) at neutral pH to simulate body fluids. The corrosion behaviour was monitored by means of electrochemical impedance spectroscopy (EIS) and anodic potentiodynamic polarization curves. Scanning electron microscopy and Energy-dispersive spectroscopy (SEM-EDS) analyses were used to evaluate the treated surfaces. The results showed that the phosphate layer provided the best performance among the treatments tested, followed by the treatment with Cr~(3+) which also offered substantial corrosion protection, but the BTSE layer did not improve the corrosion resistance of the magnets. EIS results evidenced the occurrence of diffusion-controlled phenomenon, likely due to the presence of pores in the magnet microstructure, which is a consequence of its manufacture process.
机译：这项工作的目的是通过电化学方法评估三种不同表面处理所提供的腐蚀防护的有效性：磷酸盐转化，非功能性硅烷（BTSE）层以及用Cr〜（3+）转化为工业烧结Nd-的转化处理。牙科用Fe-B磁铁。电化学测试在中性pH的磷酸盐缓冲溶液（PBS）中进行，以模拟体液。通过电化学阻抗谱（EIS）和阳极电位动力学极化曲线监测腐蚀行为。扫描电子显微镜和能量色散光谱（SEM-EDS）分析用于评估处理过的表面。结果表明，在所测试的处理中，磷酸盐层提供了最佳性能，随后用Cr〜（3+）处理也提供了显着的腐蚀防护，但是BTSE层并没有提高磁体的耐腐蚀性。 EIS结果证明了扩散控制现象的发生，这很可能是由于磁铁微结构中存在孔所致，这是其制造过程的结果。

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