PVD合成TiN和TiCN涂层在放电等离子烧结NiTi基体上的腐蚀行为

Nasim Botshekanan, Hudsa Majidian, Mohammad Farvizi
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摘要

TiN和TiCN涂层因其高熔点、优异的导热性、优异的化学稳定性、优异的耐蚀性和耐磨性以及显著的生物相容性等特点,在材料科学和工程领域得到了广泛的关注。这些特性使它们非常适合涂覆各种合金,因此,它们已成功地应用于许多应用中。本研究的目的是深入研究采用物理气相沉积(阴极电弧技术)涂层TiN和TiCN的火花等离子烧结NiTi衬底的腐蚀行为。为了全面分析腐蚀响应,采用了动电位极化和电化学阻抗谱技术。为了更深入地了解涂层的影响,对未涂层的样品和涂层的样品的耐腐蚀性进行了细致的比较。结果表明,与未涂覆的NiTi基板相比,两种涂层样品的耐腐蚀性都有显著增强。然而,发现tin涂层试样比ticn涂层试样具有更高的耐腐蚀性。这些发现突出了TiN涂层在NiTi基体上的耐腐蚀性优势。
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Corrosion behavior of TiN and TiCN coatings synthesized by PVD on the spark plasma sintered NiTi substrate
TiN and TiCN coatings have garnered widespread attentions in the field of materials science and engineering because of their exceptional characteristics, including high melting point, excellent thermal conductivity, remarkable chemical stability, superior corrosion and wear resistance, and notable biocompatibility. These properties make them highly suitable for coating various alloys, and as a result, they have been successfully applied in numerous applications. The aim of this research study is to delve into the corrosion behavior of spark plasma sintered NiTi substrates that were coated with TiN and TiCN employing physical vapor deposition (cathodic arc technology). In order to comprehensively analyze the corrosion response, potentiodynamic polarization and electrochemical impedance spectroscopy techniques were employed. To gain deeper insights into the impact of the coating, a meticulous comparison was conducted between the corrosion resistance of the uncoated specimen and that of the coated ones. The results showcased a significant enhancement in corrosion resistance for both coated samples when compared to the uncoated NiTi substrate. However, it was found that the TiN-coated specimen showed even higher corrosion resistance than the TiCN-coated counterpart. These findings highlight the superiority of TiN coatings in terms of corrosion resistance when applied on the NiTi substrate.
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