Influence of rare earth element Ce on microstructure and properties of paste boronized layer of AISI 410 steel
The surface strengthening technology of steel has important practical significance in various industrial fields.Boronizing technology is one of the most economical options,however,the main problem with this technology is the difficulty in obtaining a thick and dense boronizing layer.To solve this problem,a paste boronizing treatment with 6 mass％CeO2 addition to the boronizing agent was performed on the surface of AISI 410 stainless steel.Microstructure,phase and corrosion and wear resistance of the boronized layer were studied by means of optical microscope,scanning electron microscopy,X-ray diffraction,friction and wear experiments,and electrochemical workstations.The results show that the microstructure of the boronized layer is FeB and Fe2B from the outside layer to the inside layer,respectively.Adding CeO2 to the boronizing agent can prepare a thicker and denser boronizing layer on the surface of the AISI 410 stainless steel substrate,thereby improving its wear and corrosion resistance.The catalytic mechanism of rare earth element Ce can be attributed to two aspects.Firstly,the addition of CeO2 can participate in chemical reactions during boronizing,resulting in more active boron atoms.Secondly,due to the large size of Ce atoms,their diffusion to the steel surface will cause serious lattice distortion,thereby promoting the diffusion of boron atoms.
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