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Electrochemical Behavior of a Vacuum-Brazed 10Ni-WC/NiCrBSi Composite Coating
Journal of the Korean Physical Society ( IF 0.6 ) Pub Date : 2020-06-01 , DOI: 10.3938/jkps.76.1035
Jiawei Zhu , Jiasheng Zou , Yanxin Qiao , Yi Wang , Xiangping Xu

In this work, a 10Ni-WC/NiCrBSi composite coating was fabricated on a Q235 substrate by using vacuum brazing. The bonding strength, surface hardness and corrosion behavior of the coating were characterized by using shearing, a Vickers hardness test and an electrochemical measurement. The results showed that the bonding strength was 365.1 MPa and that the surface hardness of the coating reached nearly 2500 HV, which was ten times that of the Q235 substrate. The corrosion trend of the coating was analyzed by electrochemical impedance spectroscopy and potentiodynamic polarization curves. The results showed that the electrochemical system of the coating was a chargetransfer control system with a passive behavior. Combined corrosion micro-morphology and the energy dispersive X-ray spectroscopy (EDS) showed that the 10Ni-WC/NiCrBSi composite coating had superior corrosion resistance, but the pitting corrosion resistance of the coating was poor. In addition, after corrosion, the hard phase particles inside the coating were shown not to fail. The corrosion resistance of the vacuum-cladded 10Ni-WC/NiCrBSi coating was obtained.

中文翻译:

真空钎焊 10Ni-WC/NiCrBSi 复合涂层的电化学行为

在这项工作中,使用真空钎焊在 Q235 基体上制备了 10Ni-WC/NiCrBSi 复合涂层。通过使用剪切、维氏硬度测试和电化学测量来表征涂层的结合强度、表面硬度和腐蚀行为。结果表明,结合强度为365.1 MPa,涂层表面硬度接近2500 HV,是Q235基体的10倍。通过电化学阻抗谱和动电位极化曲线分析了涂层的腐蚀趋势。结果表明,涂​​层的电化学系统是一个具有被动行为的电荷转移控制系统。结合腐蚀微观形貌和能量色散X射线光谱(EDS)表明,10Ni-WC/NiCrBSi复合涂层具有优异的耐腐蚀性能,但涂层的耐点蚀性能较差。此外,腐蚀后,涂层内的硬质相颗粒没有失效。获得真空熔覆的 10Ni-WC/NiCrBSi 涂层的耐腐蚀性能。
更新日期:2020-06-01
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