Metal zinc-organic epoxy powder corrosion-resistant and wear-resistant composite coating and preparation method thereof
A technology of organic epoxy and composite coating, which is applied in the field of composite electrodeposition, can solve the problems of no patents and paper reports, etc., and achieve the effects of variable wear, high safety factor, and improved compactness
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Embodiment 1
[0022] (1) The treatment of the substrate: take a low carbon steel plate with a length of 20mm, a width of 15mm, and a thickness of 3mm, and grind it sequentially through 400#, 600#, 800#, 1000# water-frosted sandpaper to remove the oxide scale on the surface of the substrate and make the surface have a certain roughness, which is conducive to electrodeposition of the nucleus. The oil removal liquid is configured for oil removal treatment, the oil removal formula is 10g / l sodium hydroxide, 25g / l sodium carbonate, and the matrix is placed in a 60 °C degreasing solution and soaked for 10min. Then put into distilled water sonication, blow drying and submerging the matrix in 12wt% dilute sulfuric acid (aqueous solution) for 5 s. Then put the substrate into distilled water and sonicate, then blow dry and set aside.
[0023] (2) Preparation of electroplating solution: take 2.4g zinc oxide, 24g sodium hydroxide after dissolving in water, add 0.4ml DE and 0.8ml W906 to it, stir and mix we...
Embodiment 2
[0027] (1) the treatment of the substrate: the same as Example 1;
[0028] (2) Configuration of electroplating solution: take 2.4g zinc oxide, 24g sodium hydroxide after dissolving in water, add 0.4mlDE and 0.8ml W906 to it, stir and mix well. Then add 0.02g of sodium dodecyl sulfate and stir to dissolve. Finally, 2.4g of epoxy powder was added to the zincate plating solution to make 200ml of plating solution. The plating solution is then stirred at 1500rmp for 24h.
[0029] (3) electroplating: the same as Example 1.
[0030] In the present embodiment, the epoxy powder concentration is 12g / l, the prepared coating rms roughness (RMS) is 475.41A (pure zinc is 825.96A). The TG test was carried out in a nitrogen atmosphere, and the DTG curve had a peak at 100-200 °C (pure zinc without), and lost weight by 3.06% at 440 °C (1.02% for pure zinc). The corrosion potential measured by soaking in 3.5% NaCl solution for 1h was -1.0369V (pure zinc was -1.0407V), the sample low-frequency impe...
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