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Galvanization of steel structures has become a popular way of surface treatment of steel structural members. The articles to be galvanized shall be cleaned and fluxed to a condition that will allow the galvanizing reaction to take place. The molten metal in the working area of the galvanizing bath shall contain not less than 98% by mass of zinc. The bath may contain certain deliberately added elements to achieve special properties. The process of Hot Dip Galvanize was:
The galvanized coating shall be continuous and as smooth and evenly distributed as possible and shall be free of defects that may affect the stated use of the article. The coating shall be free from blisters, i.e. raised areas separated from the solid metal, roughness, sharp points and flux residues. Lumps and zinc ash are not permitted where they may affect the intended end use of the galvanized product. Any wet storage staining which is formed at the galvanizer’s plant shall be removed prior to the material leaving the plant, unless prior arrangements have been made. The underlying coating thickness after this removal treatment shall exceed the specified minimum value. The coating shall be sufficiently adherent to withstand normal handling without peeling or flaking.
Requirement for coting thickness and mass for articles that are not centrifuged as following:
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