Nickel base alloy powder for manufacturing anticorrosive coating of boiler tube
A technology of anti-corrosion coating and nickel-based alloy, which is applied in coating, metal material coating process, etc., can solve problems such as inclusions, unstable performance, uneven composition, etc., and achieve improved corrosion resistance and wear resistance, wear resistance and hardness and strength, increase the effect of antioxidant
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example 1
[0029] Use pulverized coal furnace boiler tube. The surface of the pipe wall is polished with sandpaper and cleaned with acetone before cladding. The chemical composition of the alloy powder used is: Cr: 43%; Ti: 6%; Si: 0.2%; Nb: 0.2%; Y: 0.2%; Hf: 0.1%; B; 0.3%; Ni: the balance. Using CO2 gas laser, the selected laser cladding process parameters are: power: 3000~5000W; spot diameter: 4mm, scanning speed: 8mm / s, powder thickness: 0.8mm.
[0030] After laser cladding, the thickness of the anti-corrosion layer is about 0.8mm. The surface of the anti-corrosion layer is smooth without cracks, pores and other defects. The combination of the anti-corrosion layer and the base material is metallurgical bonding, and the anti-corrosion performance is good.
example 2
[0032] The base material selected in this embodiment is No. 45 workpiece. The surface of the workpiece is ground with sandpaper to remove the oxide bearing layer and fatigue layer, and cleaned with acetone before cladding. The chemical composition of the nickel-based alloy powder used is: Cr: 42%; Ti: 8%; Si: 0.3%; Nb: 0.3%; Y: 0.3%; Hf: 0.2%; B; 0.2%; Ni: the balance . With a 5000W CO2 gas laser, the selected laser cladding process parameters are: power: 3000~4000W, spot diameter: 4mm, scanning speed: 6mm / s, powder thickness: 0.8mm.
[0033]After laser cladding, the thickness of the anti-corrosion layer is about 0.8mm. The surface of the anti-corrosion layer is smooth without cracks, pores and other defects. The combination of the anti-corrosion layer and the base material is metallurgical bonding, and the anti-corrosion performance is good.
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