{"id":1222,"date":"2018-07-19T09:23:57","date_gmt":"2018-07-19T09:23:57","guid":{"rendered":"http:\/\/galvaza.pt\/?page_id=1222\/"},"modified":"2025-05-30T14:21:02","modified_gmt":"2025-05-30T14:21:02","slug":"processo-galvanizacao","status":"publish","type":"page","link":"https:\/\/galvaza.pt\/en\/processo-galvanizacao\/","title":{"rendered":"Hot-Dip Galvanizing Process"},"content":{"rendered":"\n
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HOT-DIP GALVANIZING PROCESS<\/span><\/p>\n\n\n

A tried and tested process.<\/h1>\n\n\n

Hot-dip galvanizing applies a zinc coating to steel or cast-iron components by immersing them in a bath of molten zinc.<\/p>\n\n\n

The simplicity of the process is an advantage over other methods of corrosion protection.<\/p>\n\n\n

Our process has eight stages:<\/strong><\/h4>\n\n\n

1. Degreasing \u2013<\/strong> Bath in an acid solution to remove oils, greases and other contaminants.
2. Rinsing \u2013<\/strong> Water rinse to prevent contamination of the following baths.
3. Pickling \u2013<\/strong> Bath in commercial hydrochloric acid to remove oxides and mill scale.
4. Rinsing \u2013<\/strong> A second rinse to prevent contamination of the following baths.
5. Fluxing \u2013<\/strong> A zinc chloride and ammonium chloride solution that protects the part from oxidation between pickling and immersion in zinc. It also acts as a wetting agent in the zinc bath.
6. Drying \u2013<\/strong> Drying in an oven at 60 \u00b0C to dry the parts and reduce thermal shock on immersion in the zinc bath.
7. Zinc bath \u2013<\/strong> Immersion in molten zinc at 440 \u00b0C to 465 \u00b0C. The iron\u2013zinc (Fe\/Zn) reaction forms the final coating.
8. Passivation \u2013<\/strong> Passivation increases the part\u2019s resistance and, therefore, its durability.<\/p>\n\n<\/div>\n\n\n

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