Brush plating technique and spread
The brush plating technique is a new technique, in which no bath plating is needed and only special power supply, plating solutions and stylus handles are used, with the stylus handle connected with the positive pole of the power and the workpiece connected with the negative pole. In this way, the deposits are obtained resulting from the relative movement between the stylus handle dipped in solution and the workpiece.
What exactly is brush-plating?
Brush plating, also known as selective plating or spot-plating is a technique which makes it possible to deposit metals and/or alloy's on conducting materials. Actually the process exists as long as bath-plating and formerly was used to repair parts that were not completely covered; electrolyte from the bath was used then. In the sixty's they started to develop the process to a complete surface-technique and this development is still going on.
Brush systems are portable. Unlike their tank counterparts, brush plating systems use very small volumes of solution (usually only one or two liters) and stylus handles tools to apply the deposits and coatings onto localized areas. These stylus handles tools are covered with an absorbent material that is saturated with a solution and then brushed or rubbed against the part (workpiece). Brush plating requires different stylus handle tools for each different solution in the operation.
A portable power source provides the direct current required for all the processes. The power source has at least two leads. One is connected to the tool and the other is connected to the part (workpiece). The direct current supplied by the power source is used in a circuit that is completed when the tool is touching the work surface.
The work surface is prepared using the same types of tooling and equipment that are used for the final finishing operation. As with a tank plating process, brush plating requires good preparation of the work surface to produce an adherent deposit.

The principle


The part (workpiece) to be plated is connected by a flexible wire to the negative output of a Power source; this is a DC-transformer with rather some electronics added, and acts in this way as a cathode. As an anode mostly a piece of carbon is used. This anode is connected to an anode handle (stylus handle) and wrapped with an absorbing material, such as polypropylene wool or something like that. This wrapping is needed to absorb the electrolyte, which contains a high concentration of the metal to be deposit. The anode handle now is connected by a flexible wire to the positive output of the Power source. When the anode is placed on the part, the current circuit is closed and the metal from the electrolyte will deposit on the surface. (See figure) As long as the anode moves over the part to be plated and the anode is supplied with electrolyte this process will go on continuously. The electrolyte can be supplied by dipping or pumping through. In this way it is possible to apply metal on a selective area, for instance to repair a scratch in a printing cylinder.
Characteristics:
1. No bath plating, not limited by workpiece dimensions and applicable at worksite.
2. Plating layer with high strength, and thickness accurately controlled.
3. No distortion to workpiece, generally no need for reprocessing.
4. Deposition speed is 20 times faster than that of bath plating. It can save time, strength    and energy.
5. Convenient is use. It can be operated independently after trained for only a week.
6. Simple in equipments, with less investment and more benefit. The investment can be    recovered in a short period.
Today we have already produced over 100 kinds of solutions, such as: Nickel, Copper, Iron, Cobalt, Tin, Lead, Zinc, Antimony, Indium, Arsenic, Tungsten, Molybdenum, Gold, Silver and their metal alloys.
Application:
1. Repairing worn machine parts.
2. Restoring the dimension and the geometric form of the over-proof machine parts.
3. Improving the properties on the surface of the machine parts. (Hardness, wear ability,    erosion resistance, anti-oxidation, soldering weld-ability, lubricity, tenacity etc.)
4. Repairing printed-wiring board, electrical and electronic elements.
5. Scraping burrs by reverse current, carving die arrangements, making dynamic balance test.
6. Decorating and repairing buildings, ancient cultural relic, handicraft, jewelry etc...
7. Fast brush plating Ag, Sn for the electric conductor of electric power, electrical,    electric technology industries
It is widely used for repairing rolling-bearing, shaft, bush, motor-armature, cylinder, piston, machine slide way, gear, spline, surface fit oil seal, engine base, bearing support, surface fit bush, etc..
We provide brush plating technique, different power source, more than 100solutions and tools with different functions, in which containing frequently used the solution for pretreatment、function and decoration plating. We can give training and On Site Repair Services.