Ganter Norm Standard Parts - Catalogue Page 2172
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Finishes continued Electropolishing Galvanizing Nano-Passivation This electrochemical process reduces surface roughness and removes impurities, microfissures, and microstructural defects in stainless steel parts. The workpiece is placed into an immersion bath containing material-specific electrolytes and forms the anode from which a thin metallic layer is removed after direct current is applied. This general term stands for various processes for the application of pure zinc layers to steel. In all cases, the objective is to protect the substrate against corrosion for as long as possible. This process provides exceptionally good corrosion protection with minimal layer thicknesses for die-cast zinc parts. The passivation layer is only 0.3 to 0.5 μm thick and does not affect dimensional accuracy. Ganter, usually uses an anthracite-colored layer. Electropolishing operates on the micro-scale and removes rough peaks, while generating increased abrasion at the edges, which also makes electropolishing ideal for fine deburring. The process is gentle on the structure since there is neither thermal nor mechanical stress. In addition to decorative applications, electropolished elements are used, for example, in the chemistry and food industry, in container construction, or in medical technology. The galvanic zinc-coating most commonly used by Ganter uses a bath in which an electrolyte connects the workpiece which acts as the cathode to an anode made of pure zinc. Depending on process parameters, the layer thicknesses which are deposited in this way range from 2.5 to a maximum of 25 μm. The process, which is standardized according to DIN 50979, is mainly suitable for corrosion protection of small parts. The zinc which is present on the surface may also be exposed to corrosion depending on ambient conditions and is therefore subsequently protected by additional passivation to prevent zinc corrosion (white rust). The passivation consists of a chromium(III) layer and an overlying layer consisting of nanoscale SiO2 particles which have self-healing properties. If the surface becomes damaged down to the metallic substrate, the SiO2 particles migrate through the potential differences in a mobilized way to the unprotected area to reclose the layer. Nano-passivation can be performed quickly and economically as a spray or immersion process—and is also a good primer for subsequent, further coatings, such as powder coating. In addition, treatment with suitable chromium(VI)-free solutions creates a chromate layer, which considerably improves the corrosion resistance of the zinc coating. Dyes can also be introduced in this process step. Blueish or black transparent coloring is most commonly observed. Surface Treatments | Page 2171
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