高速激光熔覆液压立柱表面耐磨耐蚀Fe基非晶涂层制备工艺研究

Study on Preparation Process of Wear and Corrosion Resistance Fe-based Amorphous Coating on Surface of Hydraulic Prop by High-Speed LaserCladding

为提高煤矿液压立柱在极端工况条件下的服役寿命,在液压立柱常用材料27SiMn钢表面利用高速激光熔覆技术制备了Fe基非晶涂层,并对其显微组织、硬度和耐磨耐蚀性能进行了研究。结果表明,涂层底部存在严重的晶化转变现象,但中部和顶部存在大面积非晶相组织。涂层的显微硬度能够达到1 200 HV,是基材的5倍以上;磨损率为2.14×10~(-4)mg/N·m,较基材减少了5.9×10~(-5)mg/N·m,具有优异的耐磨损性能;涂层的Ecoor和Icoor分别为-0.57 V和8.41μA/cm~2,耐腐蚀性能较基材有明显提升。研究结果为提高液压立柱耐磨耐蚀性能提供了方法与思路。

To prolong the service life of coal mine hydraulic prop under extreme working condition,Fe-based amorphous coating was prepared on the surface of 27SiMn steel by high-speed laser cladding technology,and the microstructure,hardness,wear and corrosion resistance of the coating were studied.The results show that there is a serious crystallization transformation phenomenon at the bottom of the coating,but a wide range of amorphous phase is on the middle and top.The micro-hardness of the coating reaches 1200 HV,which is more than 5 times of the substrate.The wear rate is 2.14×10-4 mg/N·m,and is 5.9×10-5 mg/N·m less than the substrate,which indicates excellent wear resistance.The Ecoor and Icoor of the coating is-0.57 V and 8.41μA/cm2,respectively,and improves the corrosion resistance significantly compared to the substrate.The research result provides methods and ideas for improving the wear and corrosion resistance performance of hydraulic prop.