A composite thermal spray repair method for the surface of a hydraulic support column
A hydraulic support column and surface composite technology, which is applied in the direction of coating, molten spraying, metal material coating technology, etc., can solve the problems of high cost and insufficient corrosion resistance, and achieve the reduction of preparation cost and corrosion resistance and wear resistance. Excellent and efficient effect
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Embodiment 1
[0031] A method for repairing the surface of a column of a hydraulic support by composite thermal spraying, comprising the following steps:
[0032] Step 1: Check the curvature of the column of the hydraulic support to be repaired, and perform pressure correction on the column that is bent and deformed;
[0033] Step 2: Turning the surface of the hydraulic support column to remove the fatigue layer and electroplating layer on the surface;
[0034] Step 3: roughen the surface of the hydraulic support column by sandblasting;
[0035] Step 4: Prepare the bottom layer by wire flame spraying or arc spraying;
[0036] Step 5: Prepare the surface layer by supersonic flame spraying method;
[0037] Step 6: use organic resin to seal the surface coating of the hydraulic support column after spraying;
[0038] Step 7: Grinding and polishing the hydraulic support column after the hole sealing treatment, the outer surface roughness of the hydraulic support column after polishing is Ra≤0...
Embodiment 2
[0049] A method for repairing the surface of a hydraulic support column with composite thermal spraying, the difference from Example 1 is:
[0050]In step 4, an arc spraying process is used, and the process parameters are: voltage: 20-35V; current: 150-220A; air pressure: 0.5-0.6MPa.
[0051] During the implementation of step 4, arc spraying is more efficient than wire flame spraying, which is conducive to the batch repair of hydraulic support columns.
Embodiment 3
[0053] A method for repairing the surface of a hydraulic support column with composite thermal spraying, the difference from Example 1 is:
[0054] The composition percentage of the wire used in step 4 is: C: ≤0.03; Si≤1.00; Mn≤2.00; S≤0.30; P≤0.045; Cr: 16.00-18.00; Ni: 10.00-14.00; for iron.
[0055] Compared with Example 1, the material composition used in step 4 has lower hardness, but the coating has better corrosion resistance in acidic corrosive media, and is suitable for surface repair of hydraulic support columns in acidic service environments.
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