Preparation method of magnesium-nickel hydrotalcite/micro-arc oxidation composite coating layer
A technology of micro-arc oxidation and composite coating, applied in the direction of coating, anodizing, superimposed layer plating, etc., to achieve the effect of improving corrosion resistance, pollution-free environment, and broadening the scope of application
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Embodiment 1
[0021] 1) The magnesium alloy is pretreated by grinding, washing and drying;
[0022] 2) Add water to sodium silicate, sodium phosphate, and sodium hydroxide to prepare an electrolyte solution containing 10g / L sodium silicate, 10g / L sodium phosphate, and 5g / L sodium hydroxide, and place the pretreated magnesium alloy in the electrolytic In the solution, the micro-arc oxidation is carried out in the constant current mode, the micro-arc oxidation treatment time is 20min, and the frequency is 800Hz;
[0023] 3) Mix nickel nitrate and ammonium nitrate with water to prepare a mixed solution containing 0.03 mol / L nickel nitrate and 0.05 mol / L ammonium nitrate, adjust its pH to 6 with 1 wt.% ammonia water, and place the magnesium alloy after micro-arc oxidation In the mixed solution, the hydrothermal reaction was carried out at 80°C for 1 hour to prepare the magnesium-nickel hydrotalcite / micro-arc oxidation composite coating.
[0024] figure 1 It is the EDS diagram of magnesium-nic...
Embodiment 2
[0030] 1) The magnesium alloy is pretreated by grinding, washing and drying;
[0031] 2) Add water to sodium silicate, sodium phosphate, and sodium hydroxide to prepare an electrolyte solution containing 5g / L sodium silicate, 5g / L sodium phosphate, and 1g / L sodium hydroxide, and place the pretreated magnesium alloy in the electrolytic In the solution, the micro-arc oxidation is carried out in the constant current mode, the micro-arc oxidation treatment time is 20min, and the frequency is 800Hz;
[0032] 3) Mix nickel nitrate and ammonium nitrate with water to prepare a mixed solution containing 0.01mol / L nickel nitrate and 0.01mol / L ammonium nitrate, adjust the pH to 5 with 1wt.% ammonia water, and place the magnesium alloy after micro-arc oxidation In the mixed solution, the hydrothermal reaction was carried out at 50°C for 24 hours to prepare the magnesium-nickel hydrotalcite / micro-arc oxidation composite coating.
Embodiment 3
[0034] 1) The magnesium alloy is pretreated by grinding, washing and drying;
[0035] 2) Add water to sodium silicate, sodium phosphate, and sodium hydroxide to prepare an electrolyte solution containing 30g / L sodium silicate, 20g / L sodium phosphate, and 10g / L sodium hydroxide, and place the pretreated magnesium alloy in electrolytic In the solution, the micro-arc oxidation is carried out in the constant current mode, the micro-arc oxidation treatment time is 20min, and the frequency is 800Hz;
[0036] 3) Add water to nickel nitrate and ammonium nitrate to prepare a mixed solution containing 0.05 mol / L nickel nitrate and 0.1 mol / L ammonium nitrate, adjust its pH to 9 with 1wt.% ammonia water, and place the magnesium alloy after micro-arc oxidation In the mixed solution, the hydrothermal reaction was carried out at 120°C for 2 hours to prepare the magnesium-nickel hydrotalcite / micro-arc oxidation composite coating.
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