摘要
为了研究通过超音速火焰喷涂不同工艺下制备的Cr_(3)C_(2)-NiCr涂层的耐磨和耐腐蚀性能,利用HVOF在P92钢基体表面通过不同工艺制备出Cr_(3)C_(2)-NiCr涂层,并通过电子显微镜(SEM)和X射线衍射(XRD)分析涂层的微观组织形貌和物相组成。通过电化学工作站对不同工艺下的涂层样品以及P92钢基体进行测试,探索各样品在0.5%H_(2)SO_(4)溶液中的耐腐蚀性能。通过磨擦磨损试验机测试各涂层的耐摩擦磨损性能,并通过激光共聚焦得到各样品的三维形貌和表面轮廓图。结果表明,影响涂层硬度的主要因素是涂层中存在的碳化物硬质相颗粒,不同工艺得到的涂层内部的硬质相颗粒分布不同。在喷距380 mm,O_(2)流量880 L/min,煤油流量23 L/h时获得的涂层硬度最高(995 HV_(5)),磨损率会随涂层硬度的降低而升高,因此在该工艺参数下的涂层耐磨性能最好。由于影响耐蚀性的主要因素为涂层孔隙率,在电化学腐蚀实验中,在喷距380 mm,O_(2)流量830 L/min,煤油流量23L/h时获得的涂层具有最低孔隙率(1.21%),腐蚀电流密度为0.51μA·cm^(-2)。相比于P92钢基体,腐蚀电流密度减小约3个数量级。
The wear and corrosion resistance of Cr_(3)C_(2)-NiCr coatings prepared by different processes of Highvelocity oxygen-fuel has been studied.The Cr_(3)C_(2)-NiCr coating on the surface of P92 steel substrate through different processes by HVOF has been prepared.The microstructure and phase composition of the coating were analyzed by electron microscope(SEM)and X-ray diffraction(XRD).The corrosion resistance of coating samples and P92 steel matrix under different processes was tested by electrochemical workstation to explore the corrosion resistance of samples in 0.5%H_(2)SO_(4)solution.The friction and wear resistance of each coating was tested by friction and wear testing machine,and the 3 d morphology and surface profile of each sample were obtained by laser confocal scanning.The results show that the main factor affecting the hardness of the coating was the existence of carbide hard phase particles in the coating,and the distribution of hard phase particles in the coating was different with different processes.The highest coating hardness(995 HV_(5))has been obtained when the spray distance is 380 mm,the O_(2)flow rate is 880 L/min,and the kerosene flow rate is 23 L/h.The wear rate increased with the decrease of coating hardness.Therefore,the coating has exhibit best wear resistance under this process parameter.As the main factor affecting the corrosion resistance is the porosity of the coating,the lowest porosity(1.21%)and the corrosion current density(0.51μA·cm^(-2 ))were obtained at the spray distance is 380 mm,the O_(2)flow rate is 830 L/min,and the kerosene flow rate is 23 L/h in the electrochemical corrosion test.Compared with the P92 steel matrix,the corrosion current density is reduced by about 3 orders of magnitude of magnitude.
作者
白玉
赵鹏翔
赵嘉炜
马文
陈伟东
Bai Yu;Zhao Pengxiang;Zhao Jiawei;Ma Wen;Chen Weidong(Key Laboratory of Thin Film and Coating of Inner Mongolia Autonomous Region,Inner Mongolia University of Technology,School of Materials Science and Engineering,Hohhot 010051)
出处
《热喷涂技术》
2021年第3期23-32,47,共11页
Thermal Spray Technology
