A kind of aluminum alloy part with layered double hydroxide-graphene oxide silane composite coating and preparation method thereof
A technology of hydroxide and composite coatings, applied in coatings, electrolytic coatings, etc., can solve the problems of high price of fluorine-containing hydrophobic compounds, weak binding force of dip-coating modification, difficulty in coping with long-term erosion, etc., and achieve stable long-term protection effect , compact structure and high anti-corrosion performance
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[0023] The preparation method of the aluminum alloy part with the layered double hydroxide-graphene oxide silane composite coating provided by the present invention comprises the following steps:
[0024] Step S0, the preprocessing step, is performed before step S1, including a grinding step and an ultrasonic cleaning step, and the specific operations are:
[0025] (1) Grinding step, the aluminum alloy parts are polished with 600-mesh, 1000-mesh, 1500-mesh, and 2000-mesh water abrasive paper in turn,
[0026] (2) In the ultrasonic cleaning step, the polished aluminum alloy parts are placed in acetone, ultrasonically cleaned, and then rinsed with absolute ethanol and deionized water in turn to remove oil and grease on the surface of the aluminum alloy parts.
[0027] In step S1, the mixed metal salt suspension is prepared with aluminum salt and zinc salt, and the pH value of the mixed metal salt suspension is adjusted to 9-11.
[0028] In step S2, the aluminum alloy part is pl...
Embodiment 1
[0046] A preparation method of layered double hydroxide-graphene oxide silane composite coating, comprising the following steps:
[0047] Step S0, pretreatment of aluminum alloy parts:
[0048] Three pieces of 40mm×13mm×2mm aluminum alloy 5052 were polished with 600#, 1000#, 1500#, and 2000# water-grinding paper in turn. Then put the aluminum alloy in acetone, ultrasonically clean it with an ultrasonic cleaner for about 5 minutes, and then rinse it with anhydrous ethanol and deionized water in turn to remove oil and grease on the surface. One of the aluminum alloy parts obtained in this step was taken as a blank aluminum alloy (BareAl), and the remaining two were continued to be tested.
[0049] Step S1, the preparation of mixed metal salt suspension:
[0050] 0.1M zinc nitrate and 0.05M aluminum nitrate were weighed and dissolved in 200 mL of water, and concentrated ammonia water was weighed and dissolved in 20 mL of mixed metal salt suspension to adjust pH=10.
[0051] St...
Embodiment 2
[0069] A preparation method of layered double hydroxide-graphene oxide silane composite coating, comprising the following steps:
[0070] Step S0, pretreatment of aluminum alloy parts:
[0071] Three pieces of 40mm×13mm×2mm aluminum alloy 5052 were polished with 600#, 1000#, 1500#, and 2000# water abrasive paper in turn. The aluminum alloy was placed in acetone, ultrasonically cleaned with an ultrasonic cleaner for about 5 minutes, and then rinsed with absolute ethanol and deionized water in turn to remove oil and grease on the surface.
[0072] Step S1, the preparation of mixed metal salt suspension:
[0073] Weigh 0.1M and dissolve it in 200mL of water, measure concentrated ammonia water and dissolve it in 20mL of mixed metal salt suspension, and adjust pH=9.
[0074] Step S2, co-precipitation by hydrothermal treatment:
[0075] The aluminum alloy obtained in step S0 was added to the solution obtained in step S1, placed at 60° C. for 12 hours, and then dried in the air af...
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