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许多化工部件要同时承受腐蚀和磨蚀的危害,部件的寿命不仅取决于其表面耐磨性能,更依赖于材料的耐腐蚀性能。重要部件,如机械动密封,大多采用不锈钢表面堆焊司太立特钴基合金来保护。先进国家开发新型耐蚀合金粉末喷焊管状焊丝堆焊等新技术,使零件寿命大幅度提高。我国生产的钴基合金品种少、质量差,耐蚀合金粉末又无研制,因此,大多数采用进口司太立特钴基合金堆焊的生产工艺。堆焊熔池深,元素冲淡率高,加上焊条成份限制,它们的耐蚀性能往往不能满足生产要求,工件使用寿命低。例如上海石化总厂维纶厂凝固液循环泵大型循环泵用
Many chemical components to withstand the risk of corrosion and abrasion, component life depends not only on its surface wear resistance, but also depends on the material’s corrosion resistance. Important components, such as mechanical seal, are mostly made of stainless steel surfacing Silicate cobalt-based alloy to protect. Advanced countries to develop new corrosion-resistant alloy powder welding pipe welding surfacing and other new technologies, so that parts life increased significantly. China’s production of cobalt-based alloy varieties, poor quality, corrosion-resistant alloy powder and no research and development, therefore, most of the imported Division too Lit Co-based alloy surfacing production process. Deposit welding pool deep, dilute the element rate is high, coupled with the electrode composition restrictions, their corrosion resistance often can not meet the production requirements, the life of the workpiece is low. For example, Shanghai Petrochemical Plant Vinylon coagulation fluid circulating pump large circulating pump