How to confirm the maintenance method of partial silver plating
Partial silver plating confirmation maintenance method:
After careful analysis and thinking, it is confirmed that the following maintenance methods are selected for experiments:
The parts that have been machined have the coolant, lubricating oil, etc. left over from the machining process on the surface. Before local maintenance, it is necessary to remove oil from the surface to enhance the bonding force between the maintenance layer and the substrate metal.
(1) Make a mold according to the shape and size of the parts, and maintain the silver-plated surface; paste the edge of the surface to be painted with 3M tape with a width of 1 cm, and then use a manual spray gun to evenly pre-spray a layer of peelable rubber on the subsequent painted surface. After drying, spray the peelable rubber again and let it dry naturally.
(2) Stick the edge of the surface to be painted with 3M tape with a width of 1cm, and then brush the peelable rubber to the surface to be painted by hand. Peelable rubber. Natural sun-dried.
(3) For some parts that only require marginal parts (such as cover plates) and small areas to be painted, directly use 3M tape for maintenance.
Use the above methods to maintain the results:
It can be seen from the experimental results that the uniformity of spraying peelable rubber is good, the coating is thin, and the drying time is short, but the rubber can fly through the holes of the surface to be painted to the silver-plated surface, which is not easy to clean and affects the appearance of the silver-plated layer. and bonding force. Brush-applied strippable rubber has slightly less uniformity, thicker coating and longer drying time, but does not affect the silver-plated surface.
To sum up the above situation, for parts with few painted faces and holes that are easy to stick with 3M tape, use the method of spraying peelable rubber for pre-plating maintenance; and for parts with many painted faces and heat sinks, choose to erect the parts upright. , so that the hole and the painted surface are straight, and then brush the method for pre-plating maintenance. After trial production, the effect is good.