Electrolytically galvanized and bichromated cable trays (ZB)
This is a galvanic method, whereby by means of electrolysis a thin layer of zinc is applied to the steel wire. The process is carried out in accordance with EN12329: 2000. The applied zinc layer varies between 8 to 12 μm. This is followed by a treatment with chromium salts that improve the corrosion resistance. Wire ducts electrolytically galvanized and bichromated are exclusively intended for use in heated and dry rooms with negligible amounts of air pollution.
Hot galvanized cable trays (HD)
This galvanizing process is also called immersion galvanizing or hot galvanizing. The application of the zinc layer is effected by means of immersion for a short time of pre-fabricated products in a liquid zinc bath. The applied zinc layer depends on the material thickness, but is approximately 70 μm for wire channels. The process is carried out in accordance with NEN-EN ISO 1461. Screws and nuts are galvanized according to EN-ISO 10684. Hot-dip galvanizing is the galvanisation method for products that are assembled by means of welding (such as parts for suspension of cable carriers). However, wire trenches can also be galvanized in this manner after manufacture. Due to the rather large zinc layer thickness, this galvanisation method is very suitable for cable supports, which are mounted in the open air. Even in aggressive environments in the industry, hot-dip galvanized products are often in place.
Stainless steel cable trays (AISI 304 en 316)
It concerns carbon steel learned with chromium, nickel, magnesium and molybdenum. The most well-known stainless steels are AISI 304 (18/8) and AISI 316. Contrary to popular belief, stainless steels are also subject to corrosion, but their behavior is generally better when handled correctly. that of any other protective coating. Their specific behavior is due to the fact that, in an oxidizing environment, chromium and nickel spontaneously generate a layer of chromium oxide, a layer that prevents subsequent oxidation. This layer is very fragile and can be destroyed by denting, machining, soldering, …
Stainless steel EASILY easily and easily loses its properties when processed with tools that are also used with other types of steel. In that case the protective film must be regenerated by a chemical
Two different and interconnected metals in an electrolyte form a so-called galvanic couple, this will assume a potential in the electrolyte between the resting potentials of the two metals. For the least precious metal of the torque this causes accelerated corrosion as a result of the potential increase, while the other, “nobler” metal will corrode less because of the potential reduction. This phenomenon is deliberately used in cathodic protection. All this is only possible in the presence of oxygen dissolved in the electrolyte.
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