US2303242A - Metal coating - Google Patents
Metal coating Download PDFInfo
- Publication number
- US2303242A US2303242A US241393A US24139338A US2303242A US 2303242 A US2303242 A US 2303242A US 241393 A US241393 A US 241393A US 24139338 A US24139338 A US 24139338A US 2303242 A US2303242 A US 2303242A
- Authority
- US
- United States
- Prior art keywords
- acid
- phosphoric acid
- solution
- chromic
- ferrous
- 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
- 238000000576 coating method Methods 0.000 title description 16
- 239000011248 coating agent Substances 0.000 title description 12
- 229910052751 metal Inorganic materials 0.000 title description 10
- 239000002184 metal Substances 0.000 title description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-N phosphoric acid Substances OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 33
- 239000000243 solution Substances 0.000 description 20
- 235000011007 phosphoric acid Nutrition 0.000 description 18
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 17
- 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 17
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 12
- 238000005530 etching Methods 0.000 description 11
- 229910019142 PO4 Inorganic materials 0.000 description 9
- 235000021317 phosphate Nutrition 0.000 description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 7
- 239000010452 phosphate Substances 0.000 description 7
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 5
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 229910000398 iron phosphate Inorganic materials 0.000 description 4
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000080 wetting agent Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 2
- 150000003016 phosphoric acids Chemical class 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 2
- 229910000165 zinc phosphate Inorganic materials 0.000 description 2
- UEZVMMHDMIWARA-UHFFFAOYSA-N Metaphosphoric acid Chemical compound OP(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-N 0.000 description 1
- 241001208007 Procas Species 0.000 description 1
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 239000011260 aqueous acid Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- XPPKVPWEQAFLFU-UHFFFAOYSA-N diphosphoric acid Chemical compound OP(O)(=O)OP(O)(O)=O XPPKVPWEQAFLFU-UHFFFAOYSA-N 0.000 description 1
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
- GQZXNSPRSGFJLY-UHFFFAOYSA-N hydroxyphosphanone Chemical compound OP=O GQZXNSPRSGFJLY-UHFFFAOYSA-N 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 235000015927 pasta Nutrition 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical class OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229940005657 pyrophosphoric acid Drugs 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- DLYUQMMRRRQYAE-UHFFFAOYSA-N tetraphosphorus decaoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 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
- C23C22/33—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 containing also phosphates
Definitions
- This invention relates the production of paint-holding and corrosion-retarding coatings on ferrous surfaces, and relates more especially to producing such coatings by a simpler and more flexible method than is used at the present time in the rustprooflng art.
- the usual method of rustprooflng articles, preparatory to painting, involves reacting the sur-.
- One function of the chromic acid rinse is to dissolve out a part of the zinc phosphate, leaving a coating that is comparatively richer in iron phosphate because this is the more insoluble of the two.
- the final chromic acid rinse therefore, results in a film on the ferrous articlewhich contains iron phosphate, zinc phosphate, hexavalent chromium, and some trivalent chromium resulting from reduction of some chromic acid caused by its dissolving action.
- phosphate solutions Before a ferrous article can be processed in phosphate solutions it must be cleaned. This is usually done commercially by washing the surface with a hot alkaline solution followed by a water rinse. The strength of the cleaner as well as the time of washing must be carefully regulated, otherwise the phosphate coatingwill be the coating as the articles pass along on a conveyor.
- the object of the present invention is to provide a novel method of treating ferrous surfaues by a simplermeans than used with the common phosphate method.
- the phosphoric acid and chromic acid should be present under conditions where a definite etching of the metal surface will occur. It is essential that the solution applied be retained permanently on the surface and be not rinsed off or otherwise removed. Whether or not the solution will etch the metal surface depends both on the concentration of the phosphoric acid and the hexavalent chromium, and on the ratio existing between the two.
- the objects of the invention could not formed of objectionably large crystals which are V be attained, but if this ratio is reduced to .25 to 1 a definite reaction with the metal occurs resulting in a protective film of iron phosphate, trivalent chromium, and possibly some hexavalent chromium which has not been reduced. Any ratio of .25 to 1 or less will therefore result in etching and the formation of the desired products of the reaction.
- the metal to be treated is first cleaned by any suitable means. Such methods as solvent wiping, or vapor degreasing are usually employed for small articles or where there is a limited amount of production. Alkali cleaning is ordinarily adopted for production lines where auto bodies or sheet metal parts, or similar large objects are to be treated. In this case, the cleaning operation is followed by a water rinse to remove the alkali.
- a wettin agent there is a wide selection of these materials suitable for the purpose.
- Sodium lauryl sulfate known commercially as Gardinol or Duponol (trade names) is very effective.
- sodium lauryl benzene sulphonate and certain of the free sulphonic acids one of which is known commercially as Novonacco NN (trade name) are effective.
- a cold rolled steel article is this also must be removed. After the cleaned of oil and grease by wiping with naphtha and then drying the surface with clean cloths. A formula containing 10.0% phosphoric acid, 1.5% chromic acid, and .5% Duponol WA paste wetting agent is then applied to the surface by means of a brush. When the surface has been uniformly wetted the article is placed in an oven and dried for 3 minutes at 300 F. It is then removed and allowed to cool and is ready for the application of any desired paint finish without further treatment of the article.
- the metal, the'solution, or both may be heated prior to the rustprooflng operation in order to facilitate the chemical action and hasten the drYi 8..
- any of the phosphorous acids may be substituted for the ortho-phosphoric acid.
- those are phosphorous acid, meta and pyro phosphoric acid, and hypo-phosphorous acid.
- the anhydrides, such as phosphorous pentoxide, can be substituted for the ortho-phosphoric acid.
- the materials may be in concentrated form and diluted to the proper strength before use.
- a wetting. agent or alcohol it is best to add these after dilution since they will react with the chromic acid when in concentrated form.
- suiiicient amounts up to 5% or over may be required.
- the solution may be applied with a brush "or by means of a spraygumor the article canbemomentarily dipped in a quantity of the solution.
- the solution is allowed to dry upon the treated surface.
- the resulting film will contain iron phosphate, trivalent chromium an possibly some hexavalent chromium.
- a ferrous metal object having on a surface thereof an integral coating having a'composition resulting from drying onto said surface an aqueous solution containing phosphoric acid and chromic acid which will visibly etch the ferrous 2.
- a ferrousmetal object having on. 9. surface thereof an integral coating having a composition resulting from drying onto the said surface an aqueous solution containing chromic acid and phosphoric acid, the ratio between them being not more than .15 part of chromic for each part of phosphoric.
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 (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL60167D NL60167C (en(2012)) | 1938-11-19 | ||
| US241393A US2303242A (en) | 1938-11-19 | 1938-11-19 | Metal coating |
| DEM146502D DE718317C (de) | 1938-11-19 | 1939-11-19 | Verfahren zur Erzeugung korrosionsbestaendiger UEberzuege auf Metallen |
| GB30411/39A GB534883A (en) | 1938-11-19 | 1939-11-20 | Improvements relating to improving the resistance of metals to corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US241393A US2303242A (en) | 1938-11-19 | 1938-11-19 | Metal coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2303242A true US2303242A (en) | 1942-11-24 |
Family
ID=22910526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US241393A Expired - Lifetime US2303242A (en) | 1938-11-19 | 1938-11-19 | Metal coating |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2303242A (en(2012)) |
| DE (1) | DE718317C (en(2012)) |
| GB (1) | GB534883A (en(2012)) |
| NL (1) | NL60167C (en(2012)) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2768104A (en) * | 1952-03-25 | 1956-10-23 | Heintz Mfg Co | Method for coating iron |
| US2768103A (en) * | 1952-03-18 | 1956-10-23 | Heintz Mfg Co | Method for coating metals |
| US2769774A (en) * | 1952-08-05 | 1956-11-06 | Republic Steel Corp | Electrodeposition method |
| US2773623A (en) * | 1954-06-01 | 1956-12-11 | Heintz Mfg Co | Corrosion resistant coated steel members and method of making |
| US2777785A (en) * | 1953-07-30 | 1957-01-15 | Heintz Mfg Co | Composition for and method of treating metals as well as the treated product |
| US2812296A (en) * | 1953-06-16 | 1957-11-05 | United States Steel Corp | Electrochemical method for coating steel surfaces and the product thereof |
| US2832708A (en) * | 1955-11-25 | 1958-04-29 | Gen Motors Corp | Method of treating stainless steel to improve its corrosion resistance |
| US2970935A (en) * | 1959-03-02 | 1961-02-07 | Parker Rust Proof Co | Method of rinsing metallic surfaces with solutions containing hexavalent chromium |
| US3074827A (en) * | 1960-03-22 | 1963-01-22 | Armco Steel Corp | Rust inhibitive and paint holding treatment for alloyed zinc iron surfaces |
| US3219489A (en) * | 1962-05-24 | 1965-11-23 | Conversion Chem Corp | Composition and method for blackening the surfaces of cadmium and zinc |
| US4257828A (en) * | 1979-01-19 | 1981-03-24 | Nippon Paint Co., Ltd. | Non-aqueous composition for chemical treatment of a metallic substrate |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1133904A (fr) * | 1954-06-04 | 1957-04-03 | Walterisation Company Ltd | Perfectionnements au traitement de surface des métaux |
-
0
- NL NL60167D patent/NL60167C/xx active
-
1938
- 1938-11-19 US US241393A patent/US2303242A/en not_active Expired - Lifetime
-
1939
- 1939-11-19 DE DEM146502D patent/DE718317C/de not_active Expired
- 1939-11-20 GB GB30411/39A patent/GB534883A/en not_active Expired
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2768103A (en) * | 1952-03-18 | 1956-10-23 | Heintz Mfg Co | Method for coating metals |
| US2768104A (en) * | 1952-03-25 | 1956-10-23 | Heintz Mfg Co | Method for coating iron |
| US2769774A (en) * | 1952-08-05 | 1956-11-06 | Republic Steel Corp | Electrodeposition method |
| US2812296A (en) * | 1953-06-16 | 1957-11-05 | United States Steel Corp | Electrochemical method for coating steel surfaces and the product thereof |
| US2777785A (en) * | 1953-07-30 | 1957-01-15 | Heintz Mfg Co | Composition for and method of treating metals as well as the treated product |
| US2773623A (en) * | 1954-06-01 | 1956-12-11 | Heintz Mfg Co | Corrosion resistant coated steel members and method of making |
| US2832708A (en) * | 1955-11-25 | 1958-04-29 | Gen Motors Corp | Method of treating stainless steel to improve its corrosion resistance |
| US2970935A (en) * | 1959-03-02 | 1961-02-07 | Parker Rust Proof Co | Method of rinsing metallic surfaces with solutions containing hexavalent chromium |
| US3074827A (en) * | 1960-03-22 | 1963-01-22 | Armco Steel Corp | Rust inhibitive and paint holding treatment for alloyed zinc iron surfaces |
| US3219489A (en) * | 1962-05-24 | 1965-11-23 | Conversion Chem Corp | Composition and method for blackening the surfaces of cadmium and zinc |
| US4257828A (en) * | 1979-01-19 | 1981-03-24 | Nippon Paint Co., Ltd. | Non-aqueous composition for chemical treatment of a metallic substrate |
Also Published As
| Publication number | Publication date |
|---|---|
| GB534883A (en) | 1941-03-20 |
| NL60167C (en(2012)) | |
| DE718317C (de) | 1942-03-09 |
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