The equipment used in the electroplating process mainly includes various fixed tanks, barrel plating tanks, hangers, hanging baskets, etc. The following introduces the anti-rust and anti-tarnish measures of electroplating equipment.
hanger:
Square racks dominate with square plating tanks, and round racks dominate with round plating tanks.
Round plating tanks and hangers are more beneficial to ensure even current distribution. For square hangers, separate currents such as barbed wire must be added around the hangers to remove or shorten the length of the anode plates on both sides, as shown in the figure. Arrangement of oval anodes.
After processing electroplating equipment.
Anti-tarnish measures:
Add anti-tarnishing agents to the water, such as silver plating, tin plating, imitation gold plating, etc.
Each system has its own advantages and disadvantages, such as good separation ability and depth ability of cyanide zinc plating solution, detailed crystallization of the coating, good connection with the substrate, good corrosion resistance, wide process scale, and the plating solution is unchanged and easy to dominate. It is not sensitive to impurities and other benefits. However, it is highly toxic and seriously contaminates the image of the scene. The chloride zinc plating bath is a single salt plating bath without complexing agent.
Wastewater is easy to deal with:
The brightness and leveling of the coating are better than other systems; the current efficiency is high, and the deposition speed is fast; the steel with low hydrogen overpotential such as high carbon steel, castings, forgings, etc. is easily plated. However, the weak acidity of chloride ions affects the equipment Certain corrosiveness, on the one hand, will cause certain corrosion to the equipment, on the other hand, this kind of plating solution does not conform to the deep holes or tubular parts of the anode that need to be supported.
Additives include glossing agent, invariant, softening agent, wetting agent, low-zone shifting agent, etc. The glossing agent is divided into main glossing agent, carrier glossing agent and supporting glossing agent. For the same main salt system, dominate different manufacturers There are big differences in the quality of the coatings built with additives. Generally speaking, the additives in developed countries such as Europe, America and Japan are the best, followed by Taiwan, and the mainland products are relatively less color than the previous two types.
Passivation measures: advance the corrosion resistance of the coating, such as galvanizing.
A variety of main salt systems and supporting additive systems have been developed in each type of plating city. For example, zinc plating includes cyanide zinc plating, zincate zinc plating, and chloride zinc plating (or called potassium salt zinc plating). Ammonia salt galvanizing, sulfate galvanizing and other systems.
Dehydration measures:
Add dehydrating agent to water, such as processing after bright nickel plating
additive
After electroplating, various treatments are performed on the coating to enhance various properties of the coating, such as corrosion resistance, discoloration resistance, solderability, etc.
Advance weldability measures:
As tinned
Afterwards, the quarrels of the processing technology directly affect the quarrels of the coating functions. Stirring and disassembly: improve the solution activity, make the solution state spread evenly, and eliminate the seizure of bubbles in the workpiece.
Power supply: DC, good invariability, small ripple factor.
The connection between the main salt and the additives of a specific manufacturer determines the overall performance of the dominating bath. The superior additives can make up for some of the performance deficiencies of the main salt. For example, the superior chloride zinc plating additive is obtained by combining with the chloride main salt. The deep plating capacity of the bath is better than that of many cyanide zinc plating baths.
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Link to this article：Anti-rust and anti-tarnish measures for electroplating equipment
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