Abstract

Ni–Al bronze (NAB) was coated with Stellite-6 through gas-fueled high-velocity oxyfuel spraying. Scanning electron microscopy observations revealed the accumulation of Tungsten-rich particles at the substrate-coating interface. These areas played an important role in the enhancement of the mechanical properties of the coating. The coating hardness increased 5 times with respect to the substrate one. The tribological analysis of the coating was done via pin on disk method. Results showed that abrasive wear is the dominant mechanism for the substrate; on the contrary, delamination is the dominant wear mechanism in the coating. The corrosion performance of bare and coated alloy was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The corrosion potential of coated sample increases in comparison with bare alloy, corrosion current density decreases from 3.91 to 1.82 µA/cm² and the capacitive resistance is much larger.

Graphic abstract

中文翻译：

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HVOF在镍铝青铜基体上制备的Stellite-6涂层的磨损和腐蚀性能

摘要

镍铝青铜（NAB）通过气体高速火焰富氧喷涂喷涂了Stellite-6。扫描电子显微镜观察表明，富钨颗粒在底物-涂层界面处积累。这些区域在增强涂层机械性能方面起着重要作用。相对于基材，涂层硬度增加了5倍。涂层的摩擦学分析是通过针盘法进行的。结果表明，磨料磨损是基材的主要机理。相反，分层是涂层中主要的磨损机理。通过电位动力学极化和电化学阻抗谱研究了裸露和涂层合金的腐蚀性能。与裸合金相比，涂层样品的腐蚀潜能增加，²，电容电阻大得多。

图形摘要