US1745185A - Process for coating metal articles with lead - Google Patents
Process for coating metal articles with lead Download PDFInfo
- Publication number
- US1745185A US1745185A US716382A US71688224A US1745185A US 1745185 A US1745185 A US 1745185A US 716382 A US716382 A US 716382A US 71688224 A US71688224 A US 71688224A US 1745185 A US1745185 A US 1745185A
- Authority
- US
- United States
- Prior art keywords
- lead
- metal
- coating
- flux
- articles
- 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
- 229910052751 metal Inorganic materials 0.000 title description 50
- 239000002184 metal Substances 0.000 title description 50
- 238000000576 coating method Methods 0.000 title description 43
- 239000011248 coating agent Substances 0.000 title description 41
- 238000000034 method Methods 0.000 title description 15
- 230000004907 flux Effects 0.000 description 30
- 239000000243 solution Substances 0.000 description 15
- 239000010408 film Substances 0.000 description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 239000003921 oil Substances 0.000 description 11
- 238000007598 dipping method Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000000151 deposition Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 238000010791 quenching Methods 0.000 description 6
- 230000000171 quenching effect Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 230000001464 adherent effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000005234 chemical deposition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229940046892 lead acetate Drugs 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 241000861718 Chloris <Aves> Species 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 241000677647 Proba Species 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000009428 plumbing Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 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
- C23C2/10—Lead or alloys based thereon
Definitions
- the lead coating as heretofore applied is liable to peel over more or less extensive areas in which it is not firmly attached to the metal beneath, and it is furthermore apt to contain pin holes which afford access by acids or other corroding agents to the metal beneath.
- Our invention of the present application provides a process for coating metal, and particularly iron artlcles, with lead, which produces a dense, continuous and firmly adherent metal coating, which is free from pin holes and other imperfections and will not peel. W'hile applicable to the coating of other metals, it is particularly useful in connection with the protection of iron and steel of all kinds and we have found 0 it of especial value for the coating of iron and steel pipe, such as is used for plumbing and in other situations in which the pipe 1s especially exposed to corrosive fluids.
- the process more particularly with respect to lts application to steel pipe, but 1t is to be understood that it is not limited to use 1n connection with pipe or to articles of iron or steel.
- the articles to be coated are first thoroughly cleaned of scale, which may be done by the usual mechanical and pickllng operations.
- the next step in the treatment is to deposit chemically or electro-chemically on the pi e or other article to be covered, a thin film 0 lead.
- pure lead be used in this or in the succeeding step of the process to be described later on, but alloys thereof 50 including commercial lead may be used.
- the first coatm is deposited from a solution, whether chemlcal or electro-chemical, the metal thereof thoroughly enetrates the surface pores and cavities of t e body metal and interlocks the coverin film therewith so that a coating is formed w ich is firmly adherent atall pomts of the surface of the article and 1s practlcally continuous and free from in ho es and imperfections.
- the second and final coating which is of substantially greater thickness than the preliminary, is preferabl produced by di ping the article in molten ead which proba ly causes an incipient or surface fusion at least of the preliminary metal film, so that the two coatings become in effect, one, which is entirel or substantially homogeneous, and firmly a herent to the surface of the article in question.
- the first step in our improved process is the usual preliminary one of cleansing the pipe or other article to be coated. It may be first mechanically treated to remove scale, sand or other foreign matter, and then chemically cleaned, preferably by means of alkali and a pickling solution. Preferabl any surface irregularities are removed in t e mechanical treatment and the pickling operation etches and somewhat roughens the surface, microscopically itting it, and thus preparing it so that the pre iminary coating or film will more readily enetrate and interlock with the body meta After ickling the articles to be coated are thoroug ly washed.
- the preliminary coating or film of lead is next deposited on the pipe or other article being treated before opportunity 1s given for oxidation or corrosion thereof.
- Any method of forming this preliminary coatin by deposition may be employed which wi 1 yield a continuous film firmly united to the body metal.
- We have successfully used chemical deposition for the purpose employing a very dense solution of lead acetate heated to a temperature in excess of 150 degrees F. But better results have been obtained b us by means of electrodeposition.
- a suitable bath for this purpose may be made by dissolving about 60 lbs. of soda ash in 100 gallons of water and adding 10 lbs, of lead acetate thereto.
- a small current density, for example about one-half ampere per square foot of surface coated is best employed.
- a short second treatment is usually suflicient to close any in holes, but if test shows that this has not een done, the plating should be repeated until a perfect coating results.
- the ipe or other article in uestion is now foun to be covered with a t in, uniform, continuous coating of lead, which, if not actually alloyed with the body metal, at least is firmly attached thereto by interlocking of the two metals and will not peel off or ermit the penetration of liquid to the metal eneath.
- the articles being coated are next fiuxed and heated before immersion in the lead bath by which the final coating is applied.
- the next step after the reliminar fi m has been applied is the app ication 0 cold flux thereto.
- any of the common fluxing solutions may be used, as, b way of example, a solution of zinc chlori e and hydrochloric acid.
- the flux may be allowed to dry upon the article before further treatment.
- the articles are then heated in a fluxing bath.
- the articles Preferably they should be heated therein to a temperature approachin that of the lead bath in which they receive t eir major coating. Even better results are secured by heating the articles before immersion in the molten coating bath above the temperature of the latter.
- the hot flux may well be maintained at a temperature about 100 F. higher than that of the lead coating bath and preferably the articles under treatment remain in the hot flux until they aresubstantially at the temperature thereof. I have found it advantageous to remove the pipe from the flux for a very short interval of time and then return it thereto.
- w ere pi e is the article being treated it is revolve or turned about itsaxis in the flux during the treatment as this has the effect of more thoroughly applying and distributing the flux over the surfaces of the pipe.
- the bottom of the vat or referably charged with lead or other metal which is liquid at the temperature at which it is desired to maintain the flux.
- the flux floats on and is in large part indirectly heated through the lead bath, which occupies the hottest part of the furnace.
- the pipe or other articles being coated are conveyed directly to the lead coating bath which, as before stated, is maintained at a temperature of about 700 F.
- the lead coating bath which, as before stated, is maintained at a temperature of about 700 F.
- the film being so thin and penetrating as it does the pores and pits of the body metal of the article the application of a temperature well above the melting point of the metal of the film doesnot in any way affect the distribution thereof and by reason of the film of flux thereon prior to its immersion in the lead bath it is thoroughly protected from oxida tion and cleansed of any oxide or other substance which might otherwise interfere with the adhesion of the coating from the molten bath of lead. It is important that the article to be treated shall be rotated or otherwise given movement in the lead bath, as well as in the molten flux, so that the liquid metal may be brought into intimate contact therewith.
- the relative movement of the pipe with respect to the lead both assists in removing the fluxing material and any foreign matter which might interfere with the union of the metal of the bath with the preliminary coatlng.
- the pipe is taken from the lead bath it is preferably maintained in rotation until the fluid lead thereon has set.
- the pipe is next submerged and rotated in quenching oil.
- quenching oils commonly found on the market having a flash point of about 585 F. have been found satisfactory.
- the container or vat for the lat ter may well be of considerable width and provided with an inclined bottom or inclined guides down which the pipe may be rolled.
- the quenching bath may well be maintained at a temperature of about 300.
- the introduction of the hot pipe or other articles from the lead bath of course tends to raise the temperature of the quenching bath.
- the latter may well be controlled by maintaining a body of water in the bottom of the oil bath and the temperature of the water and therefore of the oil may be controlled by the introduction of hot or cold water and the removal of surplus water from time to time as required.
Description
Patented Jan. 28, 1930 UNITED STATES PATENT orrlcs SPENCER O'IIS AND WILSON T. HERE, moron, ILLINOIS, ASSIGIOBI TO NATIONAL BOILER WASHING COHYANY O1 JILINOIB, OI CHICAGO, ILLU'OIB, A
CORPORATION 01' ILLINOIS PROCESS 1'03 COATING METAL ARTICLE WITH LEAD Ho Drawing. Application filed Kay 81,
It has long been the practice to protect articles of iron intended for use in conditions in which they are exposed to corrosion with a-less readily oxidizable metal, such as zinc.
The superiority of lead as a coating for this purpose and particularly where the articles in question are to be exposed to acid corrosion, has long been recognized, but its use has heretofore been limited because of the difiiculty or impossibility of consistently securing coatings which are firmly united to the body metal throughout and free from openings through which the metal beneath can be attacked. The lead coating as heretofore applied is liable to peel over more or less extensive areas in which it is not firmly attached to the metal beneath, and it is furthermore apt to contain pin holes which afford access by acids or other corroding agents to the metal beneath. Our invention of the present application provides a process for coating metal, and particularly iron artlcles, with lead, which produces a dense, continuous and firmly adherent metal coating, which is free from pin holes and other imperfections and will not peel. W'hile applicable to the coating of other metals, it is particularly useful in connection with the protection of iron and steel of all kinds and we have found 0 it of especial value for the coating of iron and steel pipe, such as is used for plumbing and in other situations in which the pipe 1s especially exposed to corrosive fluids. In the following specification we have described the process more particularly with respect to lts application to steel pipe, but 1t is to be understood that it is not limited to use 1n connection with pipe or to articles of iron or steel.
In practicing our process, the articles to be coated are first thoroughly cleaned of scale, which may be done by the usual mechanical and pickllng operations. The next step in the treatment is to deposit chemically or electro-chemically on the pi e or other article to be covered, a thin film 0 lead. Obviously it is not essential that pure lead be used in this or in the succeeding step of the process to be described later on, but alloys thereof 50 including commercial lead may be used.
1924. Serial I0. 716,882.
Pure lead, however, is entirel satisfactory for the purpose. By reason 0 the fact that the first coatm is deposited from a solution, whether chemlcal or electro-chemical, the metal thereof thoroughly enetrates the surface pores and cavities of t e body metal and interlocks the coverin film therewith so that a coating is formed w ich is firmly adherent atall pomts of the surface of the article and 1s practlcally continuous and free from in ho es and imperfections. There is t us formed on the article a cementin layer of metal which mechanically interloc ed therewith (if not also partially alloyed with the body metal, as to which there may be some questlon) and being of practically the same composition as the final coating also, under the conditions of treatment by which the latter is applied unites firmly and throughout therewith. The second and final coating which is of substantially greater thickness than the preliminary, is preferabl produced by di ping the article in molten ead which proba ly causes an incipient or surface fusion at least of the preliminary metal film, so that the two coatings become in effect, one, which is entirel or substantially homogeneous, and firmly a herent to the surface of the article in question. It is not essential, though for practical urposes it has been found advantageous, t at the metal of the reliminary film and that of the final coatin be identical, but they should be capable o alloying or fusing into each other. It has been found of practical advantage to use lead for both coats 1ngs, ordinary commercial lead being satisfactory for the second or major coat. However, in rac-tice it has also been found that tin may e used for the final coating, and in some cases a coating of this metal is advantageous.
The first step in our improved process is the usual preliminary one of cleansing the pipe or other article to be coated. It may be first mechanically treated to remove scale, sand or other foreign matter, and then chemically cleaned, preferably by means of alkali and a pickling solution. Preferabl any surface irregularities are removed in t e mechanical treatment and the pickling operation etches and somewhat roughens the surface, microscopically itting it, and thus preparing it so that the pre iminary coating or film will more readily enetrate and interlock with the body meta After ickling the articles to be coated are thoroug ly washed.
The preliminary coating or film of lead is next deposited on the pipe or other article being treated before opportunity 1s given for oxidation or corrosion thereof. Any method of forming this preliminary coatin by deposition may be employed which wi 1 yield a continuous film firmly united to the body metal. We have successfully used chemical deposition for the purpose, employing a very dense solution of lead acetate heated to a temperature in excess of 150 degrees F. But better results have been obtained b us by means of electrodeposition. A suitable bath for this purpose may be made by dissolving about 60 lbs. of soda ash in 100 gallons of water and adding 10 lbs, of lead acetate thereto. A small current density, for example about one-half ampere per square foot of surface coated is best employed. With such a bath and current density thirty to eighty minutes immersion is ordinaril sufiicient to secure the required'coating. ther methods of chemical and electro-chemical deposition may of course be employed. Ordinarily a sin 1e treatment of this kind is suflicient to provide a firmly adherent film free from pin holes and 0t er imperfections. It is advisable, however, before applyin the final coating, to test the preliminary lm for pin holes. This may conveniently be done, in the case of iron or steel articles, by dippin them in a solution of potassium ferro-cyani e. .Any pin holes will discover themselves by the blue color produced by the testing solution and if such are found the article should be returned to the bath. A short second treatment is usually suflicient to close any in holes, but if test shows that this has not een done, the plating should be repeated until a perfect coating results. The ipe or other article in uestion is now foun to be covered with a t in, uniform, continuous coating of lead, which, if not actually alloyed with the body metal, at least is firmly attached thereto by interlocking of the two metals and will not peel off or ermit the penetration of liquid to the metal eneath.
The articles being coated are next fiuxed and heated before immersion in the lead bath by which the final coating is applied. In the preferable form of the rocess the next step after the reliminar fi m has been applied, is the app ication 0 cold flux thereto. For this purpose any of the common fluxing solutions may be used, as, b way of example, a solution of zinc chlori e and hydrochloric acid. The flux may be allowed to dry upon the article before further treatment. The articles are then heated in a fluxing bath. We
tank containing it is have found that by employing first a fluxing solution and thereafter a molten flux, that a more even and adhesive coating of metal ma be obtained in the molten bath. It is our belief that this is due to the fact that the cold solution more thoroughl reaches all parts of the metal surface and t at the molten flux liquefies and renders effective such portions of the flux applied in solution form as may remain in the cavities or pores of the metal. We have found it advantageous to use as this hot flux a composition containing about 80 per cent of zinc chlorid and about 20 per cent of common salt. In this bath the pipe or other article being treated is heated to a high temperature. Preferably they should be heated therein to a temperature approachin that of the lead bath in which they receive t eir major coating. Even better results are secured by heating the articles before immersion in the molten coating bath above the temperature of the latter. We have found it desirable on the whole to maintain the lead coating bath at a temperature of approximately 700 degrees F., the particular temperature em loyed dependin largely on the thickness of coating meta desired, the hi her the temperature of the bath, the thinner the coating. The hot flux may well be maintained at a temperature about 100 F. higher than that of the lead coating bath and preferably the articles under treatment remain in the hot flux until they aresubstantially at the temperature thereof. I have found it advantageous to remove the pipe from the flux for a very short interval of time and then return it thereto. This may well be done after the pipe has reached approximatel the temperature of the fiux. Preferably, w ere pi e is the article being treated it is revolve or turned about itsaxis in the flux during the treatment as this has the effect of more thoroughly applying and distributing the flux over the surfaces of the pipe. In order to conveniently and satisfactorily maintain the flux at the de-v sired temperature the bottom of the vat or referably charged with lead or other metal which is liquid at the temperature at which it is desired to maintain the flux. The flux floats on and is in large part indirectly heated through the lead bath, which occupies the hottest part of the furnace.
From the hot flux the pipe or other articles being coated are conveyed directly to the lead coating bath which, as before stated, is maintained at a temperature of about 700 F. By heating the article in the flux to a temperature more or less above that of the lead bath the most favorable condition for a close union between the lead of the bath and the film of lead on the pipe is afforded. The film being so thin and penetrating as it does the pores and pits of the body metal of the article the application of a temperature well above the melting point of the metal of the film doesnot in any way affect the distribution thereof and by reason of the film of flux thereon prior to its immersion in the lead bath it is thoroughly protected from oxida tion and cleansed of any oxide or other substance which might otherwise interfere with the adhesion of the coating from the molten bath of lead. It is important that the article to be treated shall be rotated or otherwise given movement in the lead bath, as well as in the molten flux, so that the liquid metal may be brought into intimate contact therewith.
The relative movement of the pipe with respect to the lead both assists in removing the fluxing material and any foreign matter which might interfere with the union of the metal of the bath with the preliminary coatlng.
As the pipe is taken from the lead bath it is preferably maintained in rotation until the fluid lead thereon has set. Preferably the pipe is next submerged and rotated in quenching oil. For this purpose the quenching oils commonly found on the market having a flash point of about 585 F. have been found satisfactory. In order to rotate the pipe in the quenching oil the container or vat for the lat ter may well be of considerable width and provided with an inclined bottom or inclined guides down which the pipe may be rolled. The quenching bath may well be maintained at a temperature of about 300. The introduction of the hot pipe or other articles from the lead bath of course tends to raise the temperature of the quenching bath. The latter may well be controlled by maintaining a body of water in the bottom of the oil bath and the temperature of the water and therefore of the oil may be controlled by the introduction of hot or cold water and the removal of surplus water from time to time as required.
We claim:
1. In a process for coating metal articles with metal, depositing a preliminary coating thereon from a solution of'lead, applying an aqueous solution of a flux thereto, then applying a molten fiux thereto, then dipping in molten metal.
2. In a process for coating metal articles with metal, depositing a prellminary coating thereonfrom a solution of lead, applying an aqueous solution of a flux therto, then applying a molten flux thereto, then. dipping in molten metal, and cooling in oil.
3. In a process for coating metal articles with metal, depositing a preliminary coating thereon from a solution of lead, applying an aqueous solution of a flux thereto, then applying a molten flux thereto, then dipping in molten metal, and cooling in oil, maintaining the oil at he desired temperature by floating it on water.
4. In a process for coating metal articles with metal, depositing a preliminary coating thereon from a solution of lead, appl ing an aqueous solution of a flux thereto, t en applying a molten fluxthereto, then dipping in molten metal, cooling in oil, maintaining the oil at the desired temperature by floating it on water, and varying the temperature of the water as required.
5. In a process for coating metal articles with metal, electroplating the articles with a preliminary film of metal, dipping the articles in a cold aqueous flux and permitting the flux to dry thereon, then heating the articles in molten flux, and dipping them in molten metal.
6. In a process for coating metal articles with metal, electroplating the articles with a preliminary film of metal, dipping the articles in a cold aqueous flux and permitting the flux to dry thereon, then heating the articles in molten flux, dipping them in molten metal, and quenching them in oil.
7. In a process for coating metal articles with metal, depositing a preliminary coating thereon from a solution of lead, applying an
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US716382A US1745185A (en) | 1924-05-31 | 1924-05-31 | Process for coating metal articles with lead |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US716382A US1745185A (en) | 1924-05-31 | 1924-05-31 | Process for coating metal articles with lead |
Publications (1)
Publication Number | Publication Date |
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US1745185A true US1745185A (en) | 1930-01-28 |
Family
ID=24879838
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US716382A Expired - Lifetime US1745185A (en) | 1924-05-31 | 1924-05-31 | Process for coating metal articles with lead |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2643975A (en) * | 1949-06-22 | 1953-06-30 | United States Steel Corp | Method of lead coating a ferrous article |
US2912346A (en) * | 1957-12-16 | 1959-11-10 | Crane Co | Method of coating ferrous articles with magnesium and magnesium-base alloys |
-
1924
- 1924-05-31 US US716382A patent/US1745185A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2643975A (en) * | 1949-06-22 | 1953-06-30 | United States Steel Corp | Method of lead coating a ferrous article |
US2912346A (en) * | 1957-12-16 | 1959-11-10 | Crane Co | Method of coating ferrous articles with magnesium and magnesium-base alloys |
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