A kind of chromium carbide gradient composite coating and preparation method thereof
A composite coating and chromium carbide technology, which is applied in the field of composite wear-resistant chromium carbide coating and its preparation, composite wear-resistant carbide coating and its preparation, can solve the problem of thin reaction layer, strict control of type and content, Cladding coatings are prone to cracks and other problems, achieving the effect of simple composition, improved mechanical properties, and easy control of the thickness of the reaction layer
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[0034] Such as figure 1 Shown, the preparation method of chromium carbide gradient composite coating of the present invention comprises the steps:
[0035] 1) After pickling the surface of the metal substrate sequentially, select 800 mesh Al 2 o 3 Sanding, rust removal with sandpaper, and then ultrasonic cleaning with alcohol or acetone; the metal substrate is low carbon steel 15 or 20 or low carbon alloy steel 15Cr, 20Cr, 20Mn2, 20MnV, 20CrMn, 20CrMnTi, 20MnTiB, 20MnVB, 18Cr2Ni4WA, 20Cr2Ni4 or 12Cr2Ni4 ; The metal matrix structure is one or more of pearlite, martensite, ferrite, bainite, austenite and sorbite according to the different heat treatment methods.
[0036] 2) Coat a layer of carburizer with a thickness of 0.2-1.0mm on the surface of the metal substrate after derusting and cleaning, adjust the carburizer to a fine paste with alcohol or acetone, and then coat it on low-carbon steel or low-carbon alloy Steel surface; Carburizer chooses any one of HYCPC-01, HYCPC-0...
Embodiment 1
[0050] 1) First, carry out surface derusting (pickling) on the surface of 15 steel to be surface strengthened. The first step of pickling is to use 300ml / L hydrochloric acid, and then rinse with running water; the second step is to use 300ml / L hydrofluoric acid for pickling Acid, then rinse with running water; the third step is surface grinding, using 800 mesh Al 2 o 3 sandpaper, and finally ultrasonically cleaned with alcohol;
[0051] 2) Then apply a layer of recarburizing agent HYCPC-01 on the surface of 15 steel, and adjust it to a thin paste with alcohol;
[0052] 3) Apply the recarburizing agent on the surface of 15 steel with a thickness of 0.2mm; then coat it with a layer of thermal insulation coating with a thickness of 1mm;
[0053] Its thermal insulation coating composition is: sodium silicate nine hydrate 10%, deionized water 40%, nano-SiO 2 2%, hollow ceramic microspheres 25%, aluminum silicate fibers 3%, SiO 2 Airgel slurry 8%, potassium hexatitanate whiske...
Embodiment 2
[0062] 1) First carry out surface derusting (pickling) on the 20Cr to be surface strengthened. The first step of pickling is to use 300ml / L hydrochloric acid, and then rinse with running water; the second step is to use 300ml / L hydrofluoric acid for pickling , and then washed with running water; the third step is surface grinding, using 800 mesh Al 2 o 3 sandpaper, and finally ultrasonically cleaned with alcohol;
[0063] 2) Then apply a layer of carburant HYCPC-02 on the surface of 20Cr, and adjust it to a thin paste with acetone;
[0064] 3) Apply the recarburizing agent on the surface of 20Cr, and then apply a layer of thermal insulation coating on it, with a thickness of 0.8mm; wherein, the thickness of the thermal insulation coating is 1.5mm;
[0065] Its thermal insulation coating composition is: sodium silicate nine hydrate 10%, deionized water 30%, nano-SiO 2 4%, hollow ceramic microspheres 20%, aluminum silicate fibers 9%, SiO 2 Airgel slurry 17%, potassium hexa...
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