fischer installation-systems main-catalogue Pagina 462
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fischer Catalogue Installation Systems Corrosion protection. In most cases , pipes and supply lines are installed in dry rooms. Therefore, in addition to corrosion resistant materials, such as plastics or stainless steel and copper, the steel products used for installation systems are galvanised. A zinc coating thickness of 5-8 µm by means of electrolytic process (galvanising) is standard. For mounting rails, Sendzimir galvanised material is mainly used. Sendzimir galvanising is a method in which the material is drawn through a molten zinc bath, thereby achieving a zinc layer thickness of 12-20 µm. This method is used when there is no more welding for the subsequent processing. This is the case for mounting rails because they are cold-formed after galvanising. By cutting and stamping the holes, the surface in this area is not completely covered by a protective layer. Punched mounting rails are therefore only recommended for the dry interior rooms. For cantilever brackets, non-galvanised channel pieces are used which are welded to the base plate. Following completion, the entire component is galvanised, creating a zinc coating thickness of 5-8 µm. 10 Threaded parts are either galvanised or made of stainless steel. Hot dip galvanising is less suitable for this because the large zinc layer thickness of 40-150 µm severely impairs the thread engagement. If installation systems are installed outdoors or in wet interior rooms, they must be made of either hot dip galvanised steel or stainless steel. Hot dip galvanising is very well suited to the protection of steel. The corrosion process is thus 10 times slower than with galvanising. The zinc loss depends on the surrounding atmosphere and humidity. An annual zinc reduction of 1–10 μm can, however, be assumed. The layer thickness is therefore crucial to the durability of the material. Crucial here are the environmental influences under which the systems are installed. An overview of the expected impact on the protective action can be seen in the following diagram and tables. Hot-dip galvanized steel Thickness of the zinc coating in µm 100 Industrial air Sea air 80 City air 60 Country air Interiors 40 Average zinc coating (40 µm) (hot-dip galvanized) 20 0 0 10 20 30 40 50 60 Protection period in years (average) 462 70 80
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