氧乙炔火焰和等离子弧喷焊合金涂层的组织和耐腐蚀磨损性能

MICROSTRUCTURE AND CORROSION WEAR PERFORMANCE OF ALLOY LAYERS OF OXY-ACETYLENE FLAME AND PLASMA ARC SPRAYING WELDING

研究了用氧乙炔火焰和等离子弧喷焊两种方法在 16Mn钢基材表面制备的自熔性铁基合金涂层和镍基合金涂层的显微组织、相组成、硬度和不同腐蚀介质下的腐蚀磨损性能 .发现两种合金涂层组织都具有枝晶生长特征 ,枝晶间存在细小的共晶组织 ,涂层均由γ固溶体和多种共晶化合物相所组成 ;铁基合金涂层枝晶发达 ,镍基合金涂层枝晶细小 ;涂层硬度越高 ,其耐磨性越好 .几种涂层的硬度和耐磨性由高到低的顺序为 :HNi6 0→DFe5 5→DNi6 0→HFe5 5 .合金涂层在酸碱腐蚀介质中的耐磨性与在中性水中的耐磨性相比都降低 ,在酸性腐蚀介质中更差 .

Microstructure,phase constitution,hardness and corrosion wear test of the different corrosion media of Fe-base self-fluxing alloy layers (HFe55 and DFe55) and Ni-base layers(HNi60 and DNi60) by oxy-acetylene flame and plasma arc had been studied on the 16Mn steel substrate.Results show that the microstructure of the layers all have characteristic of dendrites,and the layers are consisted of γ dendritic solid solution and fine eutectic structure between the dendrites.The dendrite of Fe-base layers is flourishing,but Ni-base layer is finer.The higher the hardness of the layers,the better the corrosion wear resistance of the layers.The order of the hardness and wear resistance from high to low is HNi60,DFe55,DNi60 and HFe55.The corrosion wear resistance of the layers in 4%HCl (pH6) and 4%NaOH (pH8) liquid media is lower than that in water,especially in 4%HCl acid media.