 Wastewater treatment system for residential septic systems |
| A supply tank or canister of liquid containing an aqueous solution of chlorine hereafter referred ... |
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| Inflatable tent construction |
| OF THE INVENTION As can be seen by reference to the drawings, and in particularly to FIG. 1, the ... |
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| Insulated freight cover |
| In accordance with the present invention, there is provided an insulated freight cover for ... |
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| Inflatable enclosure |
| According to one aspect of the invention, there is provided an inflatable enclosure for amusement ... |
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| System and method for converting an AGTAW welder into an AGMAW welder |
| OF THE PREFERRED EMBODIMENT FIG. 1 illustrates a prior art AGTAW welder 1 which may be converted ... |
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| Heat-recoverable article |
| We claim: 1. An article comprising two areas of woven fabric, at least one of which being heat-... |
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| Wraparound fabric article and method of making the same |
| What is claimed: 1. A method of producing a wrap-around article comprising a fabric and having a ... |
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| Gutter cleaning apparatus |
| OF THE INVENTION Referring to FIG. 2, cleaning head 10 is shown attached to handle 12 at central ... |
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| Movable partition |
| The present invention teaches that these objects can be accomplished by having at least some of the ... |
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| Rigid, multi-purpose grill cover |
| Due to the disadvantages inherent in the aforementioned known types of grill cover housing ... |
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Process for hot-dip metal-coating poorly wettable steel sheets
| Details |
Inventors: Uchida, Yukio; Hattori, Yasunori; Hirose, Yusuke; Hatanaka, Nobuo; Sakai, Nobuhiko;
Assignee: Nisshin Steel Company, Ltd. (Tokyo, JP)
Primary Examiner: Tufariello; T. M.
Assistant Examiner:
Attorney, Agent or Firm: Webb, Burden, Ziesenheim & Webb
There is disclosed a process for preparing hot-dip metal coated steel sheets having excellent corrosion resistance comprising electrolytically plating steel sheets containing Si and/or Cr with an Fe-B alloy containing 0.001.about.0.3% by weight of B to the thickness of 0.05.about.5 g/m.sup.2 and thereafter hot-dip-coating the thus pre-plated substrate sheets with a molten bath of Zn, Al or Zn-Al alloy. By this process poorly wettable steel sheets containing silicon and/or chromium can be well coated with zinc, aluminum and zinc-aluminum alloy. |
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DETAILED DESCRIPTION We claim: 1.
A process for preparing hot-dip-metal-coated steel sheets having excellent corrosion resistance comprising electrolytically plating steel sheets containing Si and/or Cr with an Fe-B alloy containing 0.
001.
about.
0.
3% by weight of B to a thickness of of 0.
05.
about.
5 g/m.
sup.
2 and thereafter hot-dip-coating the thus pre-plated substrate sheets with a molten bath of Zn, Al or Zn-Al alloy.
2.
The process as recited in claim 1, wherein the substrate steel sheet is made of a steel which contains 0.
3.
about.
2.
0% Si and/or 2.
0.
about.
30% Cr.
3.
The process as recited in claim 2, wherein the substrate steel sheet is of a steel which contains 0.
5.
about.
1.
8% Si and/or 3.
0.
about.
25% Cr.
4.
The process as recited in any one of claims 1 to 3, wherein the Zn-Al alloy contains 2.
about.
65% Al.
5.
The process as recited in claim 4, wherein the Zn-Al bath contains 3.
5.
about.
60%.
6.
The process as recited in any one of claims 1 to 3, wherein the Al Al bath contains 5.
about.
13% Si.
7.
The process as recited in any one of claims 1 to 6, wherein the Fe-B pre-plating alloy contains 0.
005.
about.
0.
2% B.
Description:
FIELD OF THE INVENTION This invention relates to a process for preparing hot-dip metal-coated steel sheets which have excellent corrosion resistance and are suitable as materials for roofing and wall-facing and other building applications, construction of chemical plants, manufacturing internal combustion engine exhaust gas treatment apparatuses, etc.
BACKGROUND OF THE INVENTION Recently, demand for steel materials having improved corrosion resistance suitable for use in building and construction of chemical plants has been growing because of increased acidification of the atmosphere, more active marine construction, etc.
Also materials having improved corrosion reistance are wanted for use in manufacturing internal combustion engine exhaust gas treatment apparatuses, because the practice of spreading salts on roads in snowy districts to prevent freezing has led to a new corrosion problem
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Gutter-related 
