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The corrosion protection performance of the HT galvanizing is based (as with all DIN EN ISO hot-galvanizing) on the formation of protective top coats, which occur through climatic influences over a few weeks or months on the surface of hot-galvanised steel components. These top coats consist mostly of alkaline zinc carbonate, whose formation depends strongly on the supply of carbon dioxide.
The so-called salt spray test, which actually doesn’t provide any relevant results in practice for hot-galvanizing because it does not apply to the corrosion behaviour of zinc coating, shows this special value upon the addition of rockfall for HT galvanizing.