Ganter Norm Standard Parts - Catalogue Sida 2173
Kommersiell Kunderbjudande **Toppförsäljare från Ganter Norm
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Finishes continued Nickel-Plating Powder Coating Steam Oxide Coating This term is a collective term for different processes that are used to apply nickel to metallic substrates. Nickel-plating is divided mainly into galvanic and chemical nickel-plating. Powder coating, also known as plastic coating, usually refers to the electrostatic process variant. The powder, consisting of pigmented thermoplastic polymer or reactive binding agents made of epoxy resin, polyester resin, or acrylic resin, is applied to the workpiece. This process is used for the post-treatment of hardened sintered parts for which black oxide coating using a saline solution cannot be used. With galvanic nickel-plating according to DIN EN ISO 1456, nickel ions are deposited from an electrolyte by the application of an electrical voltage. The layer created in this way appears silvery with a light yellow shade and is resistant to water and diluted acids and bases, but does not protect against tarnishing. Corrosion protection is also only provided to a limited extent, as the layers, which are less than 25 μm thick, are usually porous and are therefore susceptible to pitting. Multi-layer systems with chromium as the top layer are more resistant in this respect. Chemical nickel-plating, on the other hand, is not an electrochemical process. It is a reduction reaction of the surface of the part in the electrolyte bath, in which a uniform, non-porous nickel layer is formed. The end result provides very good protection against corrosive media, good abrasion resistance, and high hardness – including for parts with complex geometries with interior surfaces. The nickel layer created in this way can be soldered and is non-ferromagnetic. Page 2172 | Surface Treatments Inside the spray nozzle, the powder accumulates a negative electrostatic charge, flows along the field lines to the grounded workpiece, and also reaches the rear of the workpiece. The electrostatic charge reduces overspray and ensures adhesion of the powder up to its thermal fusion. The actual closed and homogeneous layer, with a thickness in the range from 80 to 160 μm, is not created until this step in the process. Depending on powder type, the layers are highly resilient, weatherproof, and corrosion-resistant. They also can be produced in a wide variety of colors. Powder coating is very popular due to the ease of automation of the process and its economic feasibility. With steam oxidation, the sintered part is treated with water vapor at temperatures in excess of 350 °C. The result is a thin, almost black homogeneous oxide layer of about 1 μm. Steam oxide coating only increases corrosion resistance to a small extent.
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