Galvanized, Galvannealed, Cold Rolled Sheets

06 May.,2024

 

Galvanized, Galvannealed, Cold Rolled Sheets

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Dissimilar Steel Chemistries

Most ferrous materials are suitable for hot-dip galvanizing. Cast iron, malleable iron, cast steels, hot-rolled steel, and cold-rolled steels all can be protected from corrosion with zinc applied in the hot-dip galvanizing process. Weathering steel and certain stainless steels (300 series) also can be galvanized.

It is important to understand that the chemical composition of the material being galvanized can affect coating characteristics. However, corrosion protection typically is not affected by these coating characteristic differences.

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Fabrications with varying steel chemistries can form the galvanized coating's iron-zinc intermetallic layers at different rates, resulting in a non-uniform coating appearance. Again, corrosion protection is not affected by non-uniform appearances.

Variations in color and texture do not affect the corrosion protection provided by the galvanized coating. It is important to understand that upon normal weathering in the environment, the entire coating commonly evolves to a uniform appearance.

While the overwhelming determinant of coating thickness is steel chemistry, varying surface conditions and/or different fabrication methods also can affect coating appearance. This is because different parameters for pickling (immersion time, solution concentrations, temperatures) and galvanizing (bath temperature, immersion time) are required for:

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