Galvanic or chemical surface treatment is mostly carried out either in the form of individual suspension or, in the case of bulk pourable goods, often in the so-called barrel or drum plating process.
For this purpose, the material to be treated is filled into a barrel, which is usually made of plastic for electroplating, otherwise of steel, if necessary with an appropriate lining. During electroplating, the barrel is lowered into an electrolyte tank located under the barrel, which also contains the anodes.
The barrel now rotates in the electrolyte. The material to be plated is thus mixed in the barrel body. This ensures uniform coating thickness growth in the entire fabric package. Furthermore, as is typical of the process, there are no suspension points (contact points or points), which are necessary in the case of suspension coating and usually have no coating. The parts are dried by spinning with hot air support.
It must be taken into account with drum plating that bending, scratches, impact points and scuffing will occur. Thus, depending on the weight of the individual parts, damage to external threads is to be expected. Goods that tend to snag or nest are not suitable for this type of machining. In the case of coating processes which require a tight-fitting, permanent contact, processing by the barrel plating process is also ruled out. These include the anodizing process and chrome-plating coatings such as bright chrome, hard chrome or black chrome.
For the coating of bulk materials for copper plating, nickel plating (matt or bright, electroless nickel), tin plating or for pure chemical dip treatment (e.g. pickling, degreasing), processing by means of rotating drums is a cost-effective process.
Rieger Metallveredlung has a fully automatic machine for this purpose. Furthermore, small quantities can be processed in the manual plant.
Which questions have you always asked yourself in the area of metal finishing or electroplating?
What would you like to find out about Rieger Metallveredlung? We would be happy to receive your suggested topics and incorporate them into our blog. Simply send us your topic!