Galvanized metal structures are used both indoors and outdoors. The more the surface will be exposed to moisture, the sooner the protection will decrease. Over time, the protective function can be reduced by various contaminants (both the surface and the surrounding atmosphere). As a rule, the air ceases to be clean due to a number of factors, these include:
Separately, they do not play a special role, but together take part in the formation of corrosion on the surface. To track how the zinc coating behaves in certain conditions, experts conducted a number of studies. Several environments were taken into account: rural, tropical-marine, industrial, moderate-marine, suburban. Such studies have demonstrated the real characteristics of the steel, which was galvanized by the hot method. At the same time, the tests were carried out not in an accelerated, but in the usual mode. Some manufacturers accelerate inspections, which can not have a positive impact on the quality of galvanized metal.
In fact, the rate of corrosion of zinc in almost all conditions does not go beyond 0.3 for 12 months. And, of course, if the galvanized structure is used indoors, its service life will be several times higher. As mentioned above, during the tests 5 natural environments were created, each of which has its own characteristics, and we will dwell on them in more detail. It is necessary to classify the corrosion.
Suburban environment is a zone typical for suburban areas where there are no industrial facilities. In such an environment, zinc-coated metal structures can be used for as long as possible.
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