Coating processes – With pretreatment of the base – Fluxing
Reexamination Certificate
1998-12-18
2001-04-24
Beck, Shrive (Department: 1762)
Coating processes
With pretreatment of the base
Fluxing
C427S313000, C427S329000, C427S406000, C427S419800, C427S433000
Reexamination Certificate
active
06221431
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of hot-galvanizing ferrous materials in which, in order to improve results, there is provision, during the course of the galvanizing, for a step for the introduction of various suitable metals selected from a group of metals including aluminium and nickel.
2. Description of the Related Art
Within the technical field of methods of hot-galvanizing ferrous materials, it is known to add to the molten zinc of the galvanizing bath certain metal additives which have the property of improving brightness, adhesion, and/or the aesthetic or functional aspects of the galvanizing in general and of controlling the thickness of the layer of zinc in steels with high silicon content. Typically various metal additives such as nickel and aluminium are added in the form of ZnAl and ZnNi alloys.
SUMMARY OF THE INVENTION
The present invention is based on the observation that these metal additives which are added to the galvanizing bath do not achieve an optimal output. Zinc-aluminium alloys tend to float in the bath, whereas nickel tends to precipitate and bind to the mattes in the bottom, with a clear loss of effectiveness.
The technical object of the invention is to provide a method which permits optimal hot galvanizing both in terms of the aesthetic result (the brightness of the galvanized surface, etc. . . ) and in terms of the technical result (the adhesion of the galvanizing etc. . . ), at the same time preventing all of the problems complained of with reference to the prior art mentioned.
A further object of the invention is to achieve the above-mentioned results at an advantageously low cost.
These and further objects are achieved by the invention by a method of hot-galvanizing ferrous materials. According to this method, in order to improve results, there is provision, during the course of the galvanizing, between a fluxing step and the galvanizing bath, and preferably contextually to the fluxing step, for a step for the introduction of various suitable metals including aluminium, nickel, potassium and manganese introduced in the form of their salts dissolved in the fluxing bath. It is provided that the fluxing bath be sodium-free.
Said metals are therefore applied directly to the ferrous material to be galvanized, upstream of the galvanizing bath.
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Bisol Francesco
Quesada Inigo
Schmidt Hans Harald
Barr Michael
Beck Shrive
Soprin S.R.L.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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