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Effect of TiN, TiAlCN, AlCrN, and AlTiN ceramic coatings on corrosion behavior of tungsten carbide tool
Journal of the Australian Ceramic Society ( IF 1.9 ) Pub Date : 2020-11-05 , DOI: 10.1007/s41779-020-00532-7
Sümran Bilgin , Onur Güler , Ümit Alver , Fatih Erdemir , Mustafa Aslan , Aykut Çanakçı

Hard ceramic coatings are widely used for cutting and forming applications because these coatings on the surface of the tools considerably improve the oxidation, wear, and corrosion resistance of the materials. The aim of this study is to investigate the electrochemical corrosion behavior of TiN, TiAlCN, AlCrN, AlTiN, and multi-layered coat of AlTiN on tungsten carbide (WC) at different mediums. Coatings were performed using the cathodic arc evaporation-physical vapor deposition (CAE-PVD) method. The corrosion behaviors of the coated and uncoated WC materials were carried out with potentiodynamic polarization curves which used to calculate the corrosion rate of the tested materials at the pH values of 2, 7, and 10 at the room temperature. The surface morphologies of the uncoated and coated samples were examined by a scanning electron microscopy (SEM) before and after the corrosion testing. The corrosion experiment results indicated that the corrosion rate (114.7 × 10–6 mpy) of TiAlCN coating was much lower than WC substrate material (38.83 mpy) in pH = 7. The highest corrosion rate (1.559 mpy) was obtained for TiN coating, although the corrosion rate (490.8 × 10–9 mpy) of AlCrN coating was lower in pH = 10. The corrosion resistance of AlCrN coating was also the highest, even if in acidic environment.



中文翻译:

TiN,TiAlCN,AlCrN和AlTiN陶瓷涂层对碳化钨工具腐蚀行为的影响

硬质陶瓷涂层被广泛用于切削和成型应用,因为这些工具表面的涂层大大改善了材料的抗氧化性,耐磨性和耐腐蚀性。本研究的目的是研究TiN,TiAlCN,AlCrN,AlTiN以及在不同介质上在碳化钨(WC)上的AlTiN多层涂层的电化学腐蚀行为。使用阴极电弧蒸发-物理气相沉积(CAE-PVD)方法进行涂层。用电位动力学极化曲线进行涂覆和未涂覆的WC材料的腐蚀行为,该势能极化曲线用于计算在室温下pH值为2、7和10时被测材料的腐蚀速率。在腐蚀测试之前和之后,通过扫描电子显微镜(SEM)检查未涂覆和涂覆样品的表面形态。腐蚀实验结果表明,在pH = 7的条件下,TiAlCN涂层的腐蚀速率(114.7×10–6 mpy)远低于WC基体材料(38.83 mpy),其中TiN涂层的腐蚀速率最高(1.559 mpy),尽管在pH = 10时AlCrN涂层的腐蚀速率(490.8×10–9 mpy)较低,即使在酸性环境下,AlCrN涂层的耐蚀性也最高。

更新日期:2020-11-06
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