Method for preparing aluminum alloy silver coating by utilizing dopamine
A dopamine, aluminum alloy technology, applied in metal material coating process, coating, liquid chemical plating and other directions, can solve the problems of complicated process, high cyanide toxicity, low thermal conductivity and contact resistance, etc., to simplify silver plating The process, the preparation process is simple, the effect of reducing the tolerance
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Embodiment 1
[0023] (1) Configure 10mM Tris buffer solution, the pH value at this time is 10.2, dissolve 2mg / ml dopamine in the buffer solution, and then place the polished aluminum alloy sample in the buffer solution for 24h and shake it with deionized water After cleaning, vacuum-dry at 60°C for 4 hours;
[0024] (2) Add ammonia water to the silver nitrate solution to prepare a 2wt% silver ammonia solution, place the sample in step (1) in the silver ammonia solution for 3 hours, and use the reducibility and adhesion of dopamine to remove the silver ions in the solution Reduced to simple substance and adsorbed on the surface, and then the sample was washed and dried to obtain the final sample; due to the strong alkalinity of the Tris buffer, the polymerization amount of polydopamine decreased, the inhomogeneity of the sample increased, and the reduced silver ions were also greatly reduced .
Embodiment 2
[0026] (1) Prepare Tris buffer solution (pH=8.5, 10mM) containing 2mg / ml dopamine, place the polished aluminum alloy sample in the buffer solution for 12 hours, wash it with deionized water and store it at 60°C Vacuum drying for 4h;
[0027] (2) Add ammonia water to the silver nitrate solution to prepare a 2wt% silver ammonia solution, place the sample in step (1) in the silver ammonia solution for 3 hours, and use the reducibility and adhesion of dopamine to remove the silver ions in the solution It is reduced to a simple substance and adsorbed on the surface, and then the sample is washed and dried to obtain the final sample.
Embodiment 3
[0029] (1) Prepare Tris buffer solution (pH=8.5, 10mM) containing 2mg / ml dopamine, place the polished aluminum alloy sample in the buffer solution for 24 hours, wash it with deionized water and store it at 60°C Vacuum drying for 4h;
[0030] (2) Put the above sample in 2wt% silver nitrate solution for 3 hours, use the reducibility and adhesion of dopamine to reduce the silver ions in the solution to simple substances and adsorb on the surface, then wash and dry the sample to obtain the final sample.
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