Laser Remanufacturing And Zinc Corrosion Mechanism Of Sink Roll Sleeve

Due to the limitations of steel materials resistant to molten zinc corrosion, liquid zinccorrosion of the sink roll and sleeve material is often restricted continuous hot-dip galvanizingan important part of normal production. Sink roll material widely used at home and abroadSUS-316L stainless steel. Therefore, this topic uses laser cladding technology by optimizingthe process parameters and alloy powder composition ratio,316L stainless steel surface wasprepared in good shape, excellent performance of Co-based alloys modified layer, anddeveloped rare earth oxide, Si and Cr、W、B alloying elements can affect organizationalstructure, high temperature wear properties and liquid zinc corrosion resistance of theCo-based alloy laser cladding layer, investigated the corrosion mechanism of the modifiedlayer in molten zinc and explored new molten zinc resistant surface coating materials.The results showed that: the organization of Co-based alloy laser cladding of0.5%CeO2was more dense, dendrite was relatively small, the secondary dendrite spacing was small, goodformability cladding layer. With the increase of Si, Laves phase of Co-based alloy lasercladding layer increased, hardness, high temperature wear properties improved, liquid zinccorrosion resistance capacity enhanced. In addition, after adding elements Cr, distribution ofLaves phase of Co-based alloy laser cladding was more uniform, after adding W and Belements, Co-based alloy laser cladding appeared separately a new wear-resistant hard phaseCo6W6C and CrB, laid the theoretical foundation for the further study of Co-based alloyshigh-quality laser cladding.Through morphology observation and analysis of the molten zinc solution of Co-basedalloy laser cladding, proposed molten zinc corrosion model and molten zinc corrosionmechanism of Co-based alloy laser cladding layer. Molten zinc corrosion of Co-based alloylaser cladding layer was mainly formed by Co-Zn compounds, to keep the Co-based solidsolution corrosion consumption. Molten zinc corrosion resistance of Co-based alloy lasercladding of0.5%CeO2was strong. Molten zinc corrosion process of Co-based alloy lasercladding of Si and Cr, W, B alloying elements could be simply stated as, transition Co-basedsolid solution matrix was preferentially corrode, eventually leading to be wrapped cover theLaves phase exfoliation, forming a typical tissue-selective corrosion. The study foundCo-based alloy laser cladding of adding Cr、W alloying elements evenly distributed molten zinc corrosion resistance of a large number of small Laves phase and wear hard phase Co6W6C,the best overall performance.