US127412A - Improvement in processes for coating iron with zinc - Google Patents
Improvement in processes for coating iron with zinc Download PDFInfo
- Publication number
- US127412A US127412A US127412DA US127412A US 127412 A US127412 A US 127412A US 127412D A US127412D A US 127412DA US 127412 A US127412 A US 127412A
- Authority
- US
- United States
- Prior art keywords
- zinc
- dross
- improvement
- processes
- stratum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title description 16
- 229910052725 zinc Inorganic materials 0.000 title description 16
- 239000011701 zinc Substances 0.000 title description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title description 12
- 238000000576 coating method Methods 0.000 title description 8
- 238000000034 method Methods 0.000 title description 8
- 239000011248 coating agent Substances 0.000 title description 7
- 229910052742 iron Inorganic materials 0.000 title description 6
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000003442 weekly effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
Definitions
- This invention is an improvement on the common process of coating iron'articles with zinc by dipping the articles in a bath of melted zinc, resting on a stratum of melted lead, within a pot of suitable size.
- the ordinary method is to use a thin stratum, usually three or four inches, of lead, and a very much thicker stratum of zinc, usually about thirty-six inches and weighing from twenty to thirty tons. So large a quantity of zinc under continuous heat drosses badly, and the dross sinks to the bottom of the stratum of zinc, but, being of less specific gravity than lead, it cannot reach the bottom of the pot. The reason why the dross is kept from contact with the pot is that if such contact is allowed the dross not only adheres very firmly to the pot, and is consequently difficult to remove, but also injures the material of the pot.
- the dross accumulates to the extent of from twelve hundred to fifteen hundred pounds per week, and has to be weekly removed in order that it may not obstruct the coating process. To efl'ect its removal ladles are passed into the lead stratum below the dross.
- the lead stratum has, therefore, two functions: First, to prevent the dross from falling to the bottom of the pot; and second, to form a medium into which to introduce the ladle below the dross.
- Our improved process has for its object to prevent the deposition of dross altogether. This we accomplish by increasing the lead stratum so that it forms the main portion of the bath, and decreasing the zinc stratum till it forms but a comparativelythin covering, so small in quantity that it is possible to work it out daily and renew with fresh metal, thus giving no time to form dross to any appreciable extent.
- the two metals do not amalgamate, and, as the zinc remains separate on the surface of the lead, we are enabled to use it with great economy, working all that portion which forms dross by the ordinary method into the coating, and thus effecting the saving between the difference in the price of zinc and dross, which is some five cents per pound.
- the article to be coated is of such dimensions as to pass through the zinc stratum, it enters the lead bath without injuring the zinc coating.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
Description
UNITED STATES PATENT OFFICE.
JOHN D. GREY AND JOHN LIPPINGOTT, OF BALTIMORE, MARYLAND.
IMPROVEMENT IN PROCESSES FOR COATING IRON WITH ZINC.
Specification forming part oi' Letters Patent No. 127,412, dated June 4, 1872; antedated May 16, 1872.
Specification describing a new and Improved Process for Coating Iron with Zinc, invented by JOHN D. GREY and JOHN LrPPINooTT, of Baltimore, in the county of Baltimore and State of Maryland.
This invention is an improvement on the common process of coating iron'articles with zinc by dipping the articles in a bath of melted zinc, resting on a stratum of melted lead, within a pot of suitable size.
The ordinary method is to use a thin stratum, usually three or four inches, of lead, and a very much thicker stratum of zinc, usually about thirty-six inches and weighing from twenty to thirty tons. So large a quantity of zinc under continuous heat drosses badly, and the dross sinks to the bottom of the stratum of zinc, but, being of less specific gravity than lead, it cannot reach the bottom of the pot. The reason why the dross is kept from contact with the pot is that if such contact is allowed the dross not only adheres very firmly to the pot, and is consequently difficult to remove, but also injures the material of the pot. The dross accumulates to the extent of from twelve hundred to fifteen hundred pounds per week, and has to be weekly removed in order that it may not obstruct the coating process. To efl'ect its removal ladles are passed into the lead stratum below the dross. The lead stratum has, therefore, two functions: First, to prevent the dross from falling to the bottom of the pot; and second, to form a medium into which to introduce the ladle below the dross.
Our improved process has for its object to prevent the deposition of dross altogether. This we accomplish by increasing the lead stratum so that it forms the main portion of the bath, and decreasing the zinc stratum till it forms but a comparativelythin covering, so small in quantity that it is possible to work it out daily and renew with fresh metal, thus giving no time to form dross to any appreciable extent.
The lead portion of our bath requires no renewing. No dross being deposited it will last indefinitely, and the wear of the pot will be practically nothing.
The two metals do not amalgamate, and, as the zinc remains separate on the surface of the lead, we are enabled to use it with great economy, working all that portion which forms dross by the ordinary method into the coating, and thus effecting the saving between the difference in the price of zinc and dross, which is some five cents per pound.
If the article to be coated is of such dimensions as to pass through the zinc stratum, it enters the lead bath without injuring the zinc coating.
We do not limit ourselves to any particular thickness for the zinc stratum, as we find it is practicable to coat iron when there is not more than an inch of zinc, and three or four inches is ample for all practical purposes.
Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is
The improved process, herein described, for coating iron with zinc.
To the above specification of our invention we have signed our names this 21st day of October, A. D. 1871.
JOHN D. GREY. JOHN LIPPINCOTT. Witnesses to both signatures:
SOLON C. KEMoN, 'luos. D. D. OURAND.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US127412A true US127412A (en) | 1872-06-04 |
Family
ID=2196832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US127412D Expired - Lifetime US127412A (en) | Improvement in processes for coating iron with zinc |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US127412A (en) |
-
0
- US US127412D patent/US127412A/en not_active Expired - Lifetime
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