A coating for high temperature chlorine corrosion protection and preparation method thereof
A chlorine corrosion and coating technology, which is applied in the high-temperature chlorine corrosion protection coating and its preparation field, can solve the problems of limited applicable positions, no post-heat treatment, and low processing speed of surfacing technology, and achieves wide adjustment range and melting The effect of improving coating efficiency and improving high temperature chlorine corrosion resistance
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Embodiment 1
[0027]Using argon as the carrier gas, the chemical composition is Ni 53.5wt.%, Cr 37.5wt.%, Mo 4.5wt.%, Nb 2.5wt.%, B1.98 wt.%, C, Si The content is equal to 0.02wt.%. NiCrMoNbB-based alloy powder is prepared, and the alloy powder with a particle size of 15-50 μm is selected as the raw material for preparing the cladding layer. Use an angle grinder wire brush to treat the surface of the TP347 heat-resistant steel pipe row. After completion, use compressed air to blow the surface of the pipe row to remove surface dust and other attachments. Ultra-high-speed laser cladding is used as the cladding layer preparation process. Before cladding, the alloy powder is dried at 80°C for later use. Nitrogen is used as the powder feeding gas. The powder feeding rate is 35g / min, and the laser power is 4kW. The coating is prepared under the condition that the moving speed of the head is 600mm / s. After cladding, the surface roughness of the coating can be as low as 4.5μmRa, and the cladding ra...
Embodiment 2
[0029] The chemical composition is Ni 47.8wt.%, Cr 42.05wt.%, Mo 4.5wt.%, Nb 3.1wt.%, B 2.5wt.%, C, Si content equal to 0.05wt.%. NiCrMoNbB-based alloy powder, the alloy powder with particle size of 45-100 μm is selected as the raw material for preparing cladding layer. Use corundum sand with a particle size of 16 mesh to sandblast the surface of the TP347 heat-resistant steel pipe row under the condition of compressed air pressure of 0.7MPa. After sandblasting, use compressed air to blow the surface of the pipe row to remove sand inclusions on the surface. The cladding layer is prepared by row-type automatic plasma transfer arc surfacing. Before cladding, the powder is dried at 80°C for standby use. Nitrogen is used as the powder feeding gas, the powder feeding rate is 25g / min, and the plasma power is 32kW. , the coating was prepared under the condition that the moving speed of the cladding head was 15mm / s, and the cladding rate reached 0.65m 2 / h, no macroscopic defects suc...
Embodiment 3
[0031] The chemical composition is Ni 52wt.%, Cr 38.5 wt.%, Mo4.0wt.%, Nb 3.0wt.%, B 2.47wt.%, and the content of C and Si is equal to 0.03wt.%. NiCrMoNbB-based alloy powder is prepared, and the alloy powder with a particle size of 45-120 μm is screened as a raw material for preparing a cladding layer. Use corundum sand with a particle size of 16 mesh to sandblast the surface of the Q235 carbon steel pipe row under the condition of compressed air pressure of 0.7MPa. After sandblasting, use compressed air to blow the surface of the pipe row to remove sand inclusions on the surface. First, flame spraying is used to prefabricate the coating on the surface of Q235 carbon steel pipe row. Before spraying, the powder is dried at 80°C for standby use. Dry compressed air is used as the powder feeding gas, and the powder feeding rate is 45g / min. The oxygen flow rate is 430L / h, the acetylene flow rate is 800L / h, and the flame gun moving speed is 300mm / s to prepare the coating. Under the ...
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