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US 8,802,198 B2Granted
Flux and fluxing bath for hot dip galvanization, process for the hot dip galvanization of an iron or steel article
AssigneeGalva Power Group N.V.
InventorsDavid Warichet, Gentiana Kone, Anthony Vervisch
Life of this patent
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Abstract
The present invention generally relates to a flux for hot dip galvanization comprising from: 36 to 80 wt. % (percent by weight) of zinc chloride (ZnCl2); 8 to 62 wt. % of ammonium chloride (NH4C); from 2.0 to 10 wt. % of a least one of the following compounds: NiCl2, MnCl2 or a mixture thereof. The invention further relates to a fluxing bath, a process for the hot dip galvanization of an iron or steel article as well as to the use of said flux.
Claims11
A process for hot dip galvanization of an iron or steel article comprising:
- a) degreasing the article in a degreasing bath;
- b) rinsing the article;
- c) pickling the article;
- d) rinsing the article;
- e) treating the article in a fluxing bath comprising between 200 and 700 g/l of the flux, said flux comprising on a weight percent basis:
- 36 to 60 wt. % zinc chloride (ZnCl2),
- 8 to 62 wt. % ammonium chloride (NH4Cl),
- 2.0 to 10 wt. % NiCl2, MnCl2 or a mixture thereof,
- wherein the total of the above salts is 100% by weight of said flux;
- f) drying the article or letting the article dry in the ambient air;
- g) dipping the article in a hot dip galvanizing bath of zinc-200-500 ppm aluminium alloys, or of common pure zinc to form a metal coating thereon;
- and
- h) cooling the article in water based solution or with air.
10 more elements
A process of hot dip galvanization of an iron or steel article comprising:
- degreasing the article in a degreasing bath;
- rinsing the article;
- pickling the article;
- rinsing the article;
- treating the article in a fluxing bath comprising between 200 and 700 g/l of a flux,
- wherein the flux consists of on a weight percent basis:
- 36 to 60 wt. % of zinc chloride (ZnCl2),
- 8 to 62 wt. % of ammonium chloride (NH4Cl),
- 2 to 10 wt. % of NiCl2, MnCl2 or a mixture thereof;
- drying the article or letting the article dry in the ambient air;
- dipping the article in a hot dip galvanizing bath of zinc-200-500 ppm aluminum alloys, or of common pure zinc to form a metal coating thereon;
- and
- cooling the article in water based solution or with air.
10 more elements
Dependencies are inferred from the claim text.