US2784122A - Process of retarding corrosion of coated metal articles and coated metal article - Google Patents
Process of retarding corrosion of coated metal articles and coated metal article Download PDFInfo
- Publication number
- US2784122A US2784122A US333618A US33361853A US2784122A US 2784122 A US2784122 A US 2784122A US 333618 A US333618 A US 333618A US 33361853 A US33361853 A US 33361853A US 2784122 A US2784122 A US 2784122A
- Authority
- US
- United States
- Prior art keywords
- articles
- solution
- aluminum
- sheets
- water
- 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
- 238000000034 method Methods 0.000 title claims description 30
- 238000005260 corrosion Methods 0.000 title claims description 19
- 230000007797 corrosion Effects 0.000 title claims description 19
- 229910052751 metal Inorganic materials 0.000 title description 11
- 239000002184 metal Substances 0.000 title description 11
- 230000000979 retarding effect Effects 0.000 title description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 30
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Chemical compound O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 19
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 14
- 229910052725 zinc Inorganic materials 0.000 claims description 14
- 239000011701 zinc Substances 0.000 claims description 14
- 238000000576 coating method Methods 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 4
- 150000007524 organic acids Chemical class 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 2
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 20
- 238000011282 treatment Methods 0.000 description 14
- 235000016804 zinc Nutrition 0.000 description 14
- 239000010408 film Substances 0.000 description 10
- 241001163841 Albugo ipomoeae-panduratae Species 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000009736 wetting Methods 0.000 description 8
- 239000003513 alkali Substances 0.000 description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000005507 spraying Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 238000010306 acid treatment Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000000080 wetting agent Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910052790 beryllium Inorganic materials 0.000 description 2
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- 229940117975 chromium trioxide Drugs 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N chromium trioxide Inorganic materials O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- GAMDZJFZMJECOS-UHFFFAOYSA-N chromium(6+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+6] GAMDZJFZMJECOS-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 150000007522 mineralic acids Chemical class 0.000 description 2
- 239000011253 protective coating Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- NYQDCVLCJXRDSK-UHFFFAOYSA-N Bromofos Chemical compound COP(=S)(OC)OC1=CC(Cl)=C(Br)C=C1Cl NYQDCVLCJXRDSK-UHFFFAOYSA-N 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 150000001242 acetic acid derivatives Chemical class 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 150000001767 cationic compounds Chemical class 0.000 description 1
- KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- 150000004675 formic acid derivatives Chemical class 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- -1 greases Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000008234 soft water Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- GPRLSGONYQIRFK-MNYXATJNSA-N triton Chemical compound [3H+] GPRLSGONYQIRFK-MNYXATJNSA-N 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
- 235000020681 well water Nutrition 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/24—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds
Definitions
- the principal object of our invention is the provision of a means and process for inhibiting the white rusting of galvanized and aluminum coated ferrous materials, sheets and shapes, which will be less expensive and more effective than procedures hitherto current inthe art.
- the white rusting of galvanized materials, sheets and shapes has been a problem of long standing in the art.
- the development of white rust occurs most rapidly when water or moisture is confined against the coated metallic surface by some immediately'overlying member. It is particularly severe where sheets or shapes are stacked in such a way that moisture can collect between the layers and remain there for long periods of time.
- Galvanized articles are ordinarily made with a high surface luster which is rapidly and seriously damaged by this type of corrosion.
- sheets for example, begin to corrode in packs, an initial very thin film of corrosion reaction products presents a blackish appearance.
- the thickening layer of corrosion products becomes a whitish deposit which is very difficult to remove and in many instances completely destroys the good appearance of the product.
- a zinc coated iron or steel surface directlyexposed to weather is capable of giving long service under most circumstances without great loss of its appearance value. This is because thin films of corrosion products are more or less continuously removed by the elements which produce them; but the conditions within a pack of sheets or a stack of shapes where these are subjected to high moisture con ditions are such as more or less permanently to ruin their appearance within a very short time. Moreover, the rapid formation of white rust and deposits shortens the useful life of the corrosion resistant coatings when the articles are placed in service.
- galvanized or zinc coated articles we desire to be understood as including not only pure zinc but also the less pure zincs of any of the commercial spelters or zinc sources as well as alloys of zinc with minor amounts of other metals such, for example, as aluminum.
- aluminum we mean a surface consisting principally of that metal.
- Our interest lies chiefly in the field of ferrous sheets or other bodies coated with aluminum and in this connection our disclosure is that the procedures and practices hereinafter taught are effective with base metal bodies coated with any aluminum or aluminum alloy which is suitable for hot dipping.
- aluminum is sometimes alloyed with minor amounts of silicon and to such alloys magnesium is sometimes added to control the spangle.
- Alloys of aluminum and beryllium are used for hot dipping as well as alloys of aluminum containing both silicon and beryllium.
- the exigencies of processes of coating with socalled pure aluminum frequently result in contamination of the aluminum with iron, the contamination frequently reaching a saturation point at around 3%.
- Our teachings are applicable to all such aluminum alloys as well as to aluminum itself containing the normal impurities characteristic of the commercial metal.
- chromic acid solution may be formed, if desired, by dissolving chromium trioxide in pure water.
- water solution of the chromic acid should be substantially free of mineral and organic acid radicals, such as chlorides, sulfates, nitrates, fluorides, formates, acetates and the like, and this is what we mean by the use of the term pure water herein.
- the clean surface to be treated is brought into contact with the solution by immersion, spraying or roller coat-
- the solution has been found by us to be most active in the temperature range of 150-200 F. Temperatures below 150 F. may give rise to the need of a longer reaction time and, hence, are undesirable. If the article has a temperature substantially in excess of 200 R, we have found that it may not be readily wetted by the solution.
- the chromic acid solution may contain from about /2% to 4% or 5% of the chromic acid by weight, our preference being for a range of concentration of from 1% to 3%. Optimum results are obtained, by way of example, from a 1% solution of chromic acid at 170 F.
- the water used to form the chromic acid solution be thoroughly purified and freed of extraneous ions as set forth above. Tap waters and well waters used in forming chrornic acid solutions will frequently impart fair rust resistance, but have strong and variable tendencies to form colored films impairing the appearance of the galvanized or aluminum-surfaced articles.
- the required temperatures are attained by preheating the solution and/or by preheating the articles.
- the time of contact between the treating solution and the surface to which it is applied is not important in the usual sense, providing thorough wetting is obtained. For example, if the articles are dipped in a bath, it is not necessary that they be held beneath the surface of the bath for any specified interval of time once thorough wetting has occurred.
- wetting agent In the treating solution, it is possible to use a Wetting agent in the treating solution.
- the wetting agent must be one which is stable in the presence of chromic acid in solution, and must not ionize in solution to produce ions corresponding to the deleterious radicals mentioned above, including the sulfonate.
- the choice of Wetting agents therefore, appears limited, and, so far as our investigations have extended, is probably confined to the so-called nonionics. Good results may be attained with poly-ether alcohols such, for example, as the material sold under the trade name Triton NE by Rohm & Haas Co.
- the metal surfaces be clean when treated in accordance with our process, especially in the sense of being free from oily, greasy, or other materials which would interfere with wetting.
- the surfaces of the sheets or articles have been contaminated or soiled, as from handling, they should be cleaned in a mild alkali before the chromic acid treatment in order to secure maximum protection.
- a sodium cyanide bath is preferred by us as a precleaner. If the chromic acid treatment is practiced immediately after the hot coating of the articles and before they have had an opportunity to become contaminated or soiled, the cleaning operation can be avoided.
- Great quantities of galvanized and aluminum coated strip are today produced in accordance with the processes and apparatus of the Sendzimir Patents 2,110,893, 2,136,957 and 2,197,622. It is readily possible to include equipment for the practice of our process in the production line of such operations, at a point where the freshly coated surface of the strip has cooled to a temperature of approximately 200 F. or lower.
- Sheet, strip, or other metal coated material or articles treated in accordance with our process is substantially unchanged in appearance, while significantly increased in corrosion resistance.
- the surfaces of such materials are dry, so that they do not present the handling problems of previous waxed, lacquered or greasy sheets. Soldering, brazing and welding operations are not affected by our treatment.
- Our treatment should not be practiced upon sheet or strip or other materials which are intended to be phosphated, Bonderized or otherwise chemically treated. Atmospheric and under-water corrosion resistance are improved.
- Resistance to corrosion may be measured in terms of the number of cycles required for the production of observable white rust.
- a similar test may be performed by wetting the sheets, by spraying them with distilled water before assembling the pack and then storing the pack for a week as described.
- a process of increasing the corrosion resistance of articles having surfaces of a material chosen from a class consisting of zinc, aluminum and alloys thereof which comprises treating the clean surfaces of the said articles with a solution of chromic acid as the solute and water as the solvent, which water is substantially free of organic and inorganic acid radicals and in which the combined sulfate and chloride content does not exceed about 15 p. p. m., so as to form a film of the solution thereon, the concentration of the said solution being substantially /2% t0 5%, and drying the said film, whereby to produce upon the surfaces of said articles a thin and substantially colorless rust-resistant coating.
- a process of treating articles having surfaces of a material chosen from a class consisting of Zinc, aluminum and alloys thereof to impart rust resistance thereto which comprises bringing the said surfaces into contact with a solution of chromic acid in water substantially free of organic and inorganic acid radicals and in which the combined sulfate and chloride content does not exceed about 15 p. p. m., said solution having a concentration of substantially 1% to 3% and a temperature of substantially 150 F. to 200 F., for a time of substantially 5 to 15 seconds, thereupon removing excess solution from the said surfaces and drying said surfaces without rinsing.
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US333618A US2784122A (en) | 1953-01-27 | 1953-01-27 | Process of retarding corrosion of coated metal articles and coated metal article |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US333618A US2784122A (en) | 1953-01-27 | 1953-01-27 | Process of retarding corrosion of coated metal articles and coated metal article |
| GB7087/53A GB749758A (en) | 1953-03-13 | 1953-03-13 | A process of retarding corrosion of zinc and aluminium surfaces |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2784122A true US2784122A (en) | 1957-03-05 |
Family
ID=9826360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US333618A Expired - Lifetime US2784122A (en) | 1953-01-27 | 1953-01-27 | Process of retarding corrosion of coated metal articles and coated metal article |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US2784122A (en, 2012) |
| BE (1) | BE518671A (en, 2012) |
| CA (1) | CA528711A (en, 2012) |
| DE (1) | DE1084103B (en, 2012) |
| FR (1) | FR1079881A (en, 2012) |
| GB (1) | GB749758A (en, 2012) |
| IT (1) | IT507220A (en, 2012) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2977259A (en) * | 1959-08-18 | 1961-03-28 | United States Steel Corp | Method of inhibiting white rust on zinc surfaces |
| US3096220A (en) * | 1960-10-31 | 1963-07-02 | Robert S Dalrymple | Corrosion protection of aluminum |
| US3779815A (en) * | 1972-01-03 | 1973-12-18 | Diamond Shamrock Corp | Applying chromic acid-amino acid, or lactam, or amide coating compositions to metals |
| US4504325A (en) * | 1982-03-19 | 1985-03-12 | The Boeing Company | Method for sealing an aluminum oxide film |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB985025A (en) * | 1960-05-25 | 1965-03-03 | Canada Steel Co | Process for coating zinc and zinc-iron alloy surfaces |
| GB1497559A (en) * | 1975-08-29 | 1978-01-12 | Rolls Royce | Method of applying a coating to a steel part |
| GB8710011D0 (en) * | 1987-04-28 | 1987-06-03 | Bnf Metals Tech Centre | Treatment of condenser tubes |
| FR2617423A1 (fr) * | 1987-06-30 | 1989-01-06 | Cegedur | Procede d'assemblage par diffusion a l'etat solide d'elements en aluminium ou en alliage d'aluminium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB223994A (en) * | 1923-08-02 | 1924-11-03 | Guy Dunstan Bengough | Improved process of protecting surfaces of aluminium of aluminium alloys |
| US2035380A (en) * | 1933-05-13 | 1936-03-24 | New Jersey Zinc Co | Method of coating zinc or cadmium base metals |
| US2186579A (en) * | 1933-06-28 | 1940-01-09 | Udylite Corp | Method of brightening metals electronegative to iron |
| US2250508A (en) * | 1936-06-15 | 1941-07-29 | John S Thompson | Treating zinc with organic acids |
| US2315564A (en) * | 1941-03-27 | 1943-04-06 | Parker Rust Proof Co | Art of coating and fabricating steel articles |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB563025A (en) * | 1942-06-02 | 1944-07-26 | Ford Motor Co | Improvements in and relating to the surface treatment of zinc or cadmium or metals coated therewith |
| US2393663A (en) * | 1943-03-22 | 1946-01-29 | Rheem Res Products Inc | Coating for cadmium and zinc |
| US2497905A (en) * | 1945-03-03 | 1950-02-21 | Rheem Mfg Co | Coating zinc or cadmium to impart corrosion and abrasion resistance |
| BE490295A (en, 2012) * | 1948-08-27 | |||
| US2559812A (en) * | 1949-01-25 | 1951-07-10 | Tennessee Coal Iron And Railro | Solution and method for coating zinc surfaces |
| US2568936A (en) * | 1949-12-14 | 1951-09-25 | American Chem Paint Co | Method of improving the resistance to corrosion and abrasion of certain coated aluminum surfaces |
-
0
- CA CA528711A patent/CA528711A/en not_active Expired
- IT IT507220D patent/IT507220A/it unknown
-
1953
- 1953-01-27 US US333618A patent/US2784122A/en not_active Expired - Lifetime
- 1953-03-13 GB GB7087/53A patent/GB749758A/en not_active Expired
- 1953-03-23 FR FR1079881D patent/FR1079881A/fr not_active Expired
- 1953-03-24 BE BE518671D patent/BE518671A/xx unknown
- 1953-03-27 DE DEA17707A patent/DE1084103B/de active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB223994A (en) * | 1923-08-02 | 1924-11-03 | Guy Dunstan Bengough | Improved process of protecting surfaces of aluminium of aluminium alloys |
| US2035380A (en) * | 1933-05-13 | 1936-03-24 | New Jersey Zinc Co | Method of coating zinc or cadmium base metals |
| US2186579A (en) * | 1933-06-28 | 1940-01-09 | Udylite Corp | Method of brightening metals electronegative to iron |
| US2250508A (en) * | 1936-06-15 | 1941-07-29 | John S Thompson | Treating zinc with organic acids |
| US2315564A (en) * | 1941-03-27 | 1943-04-06 | Parker Rust Proof Co | Art of coating and fabricating steel articles |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2977259A (en) * | 1959-08-18 | 1961-03-28 | United States Steel Corp | Method of inhibiting white rust on zinc surfaces |
| US3096220A (en) * | 1960-10-31 | 1963-07-02 | Robert S Dalrymple | Corrosion protection of aluminum |
| US3779815A (en) * | 1972-01-03 | 1973-12-18 | Diamond Shamrock Corp | Applying chromic acid-amino acid, or lactam, or amide coating compositions to metals |
| US4504325A (en) * | 1982-03-19 | 1985-03-12 | The Boeing Company | Method for sealing an aluminum oxide film |
Also Published As
| Publication number | Publication date |
|---|---|
| CA528711A (en) | 1956-08-07 |
| FR1079881A (fr) | 1954-12-03 |
| GB749758A (en) | 1956-05-30 |
| BE518671A (en, 2012) | 1955-03-04 |
| IT507220A (en, 2012) | |
| DE1084103B (de) | 1960-06-23 |
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