US3912601A - Surface treatment of tin-plated steel sheets - Google Patents
Surface treatment of tin-plated steel sheets Download PDFInfo
- Publication number
- US3912601A US3912601A US489489A US48948974A US3912601A US 3912601 A US3912601 A US 3912601A US 489489 A US489489 A US 489489A US 48948974 A US48948974 A US 48948974A US 3912601 A US3912601 A US 3912601A
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- United States
- Prior art keywords
- tin
- plated steel
- steel sheet
- surface treatment
- steel sheets
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/36—Phosphatising
Definitions
- ABSTRACT A surface treatment of a tin-plated steel sheet which comprises electrolyzing the tin-plated steel sheet as cathode with a quantity of electricity between 1 and 50 c/dm in an aqueous solution containing 1 to 50 g/l of at least one of aluminum dihydrogenphosphate, aluminum monohydrogenphosphate and their mixture.
- the present invention relates to surface treatment of tin-plated steel sheets, and more particularly relates to the surface treatment of tin-plated steel sheets for the purpose of prevention of damage to the sheet otherwise caused during a can-making process or during transportation.
- electro-tin-plated steel sheets are subject to a passivation treatment after electro-tin plating in order to prevent oxidation of the surface of the tin-plated steel sheet.
- an electrolytic treatment in a sodium bichromate bath has been widely used.
- This electrolytic treatment although very useful for preventing abnormal increase of the tin oxide, has a defect in that a small amount of chromium oxide in the surface adheres and accumulates on the piler and tools in the can-making line and causes damages to the surface of the tin-plated steel sheet.
- the present inventors have conducted various studies and experiments on surface treatments which satisfy the oxidation (passivation) of tin and are effective to prevent the surface damage, and have discovered that the formation of a phosphate film is most effective for this purpose. Then the present inventors have con- The reason for limiting the concentration of aluminum dihydrogenphosphate Al (H PO aluminum monohydrogenphosphate Al (HPO or their mixture to the range from 1 to g/l is that if the concentration is less than 1 g/l, an effective film for preventing the surface damage is not formed and if the concentration is more than 50 g/l, there is a tendency for deterioration of the surface brightness other than the surface damage problem.
- H PO aluminum monohydrogenphosphate Al HPO or their mixture
- the pH value of the aqueous solution is maintained to 3 or less since if the pH value exceeds 3, the surface brightness is deteriorated.
- the bath temperature As for the bath temperature, better results can be obtained when it is between 20 and 80C.
- the tin-plated steel sheet when treated under the above conditions, possesses very excellent properties.
- EXAMPLE 1 A low carbon steel sheet of 0.23 mm thickness produced from an ordinary method was degreased in a caustic soda solution and then acid-pickled in a sulfuric acid solution. The surface-cleaned steel sheet was subjected to electro-tin-plating in a stannous phenolsulfonate electrolyte to give a tin coating of 12 g/m the thus tin-plated steel sheet heated to 270C to melt the tin to obtain mirror brightness, and then treated under the following conditions.
- a tin-plated steel sheet prepared by the method of Example 1 was treated as a cathode under the following conditions.
- a tin-plated steel sheet prepared by the method of Example 1 was treated as a cathode under the following conditions.
- Treating bath Aluminum dihydrogenphosphatc l g/l A tin-plated steel sheet prepared by the method of Example 1 was treated as a cathode under the following conditions.
- a tin-plated steel sheet prepared by the same method as in Example 1 was treated as a cathode under the following conditions.
- a tin-plated steel sheet prepared by the same method as in Example 1 was treated as a cathode in a 0.5% sodium carbonate solution for 2 seconds with a current density of5 Aldm and then treated as a cathode under the following conditions.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrochemical Coating By Surface Reaction (AREA)
- Electroplating Methods And Accessories (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
A surface treatment of a tin-plated steel sheet which comprises electrolyzing the tin-plated steel sheet as cathode with a quantity of electricity between 1 and 50 c/dm2 in an aqueous solution containing 1 to 50 g/l of at least one of aluminum dihydrogenphosphate, aluminum monohydrogenphosphate and their mixture.
Description
United States Patent [1 1 Asano et al.
[451 Oct. 14, 1975 SURFACE TREATMENT OF TIN-PLATED STEEL SHEETS [30] Foreign Application Priority Data Aug. 1, 1973 Japan 48-86622 52 us. Cl 204/56 R; 204/35 R; 204/40 51 Int. cl. c251) 11/36 [58] Field of Search 204/35 R, 56 R, 54, 40
[56] References Cited UNITED STATES PATENTS 3,616,307 10/1971 Snyder ..204/56R FOREIGN PATENTS OR APPLICATIONS 698,632 11/1964 Canada 204/35 R Primary ExaminerR. L. Andrews Attorney, Agent, or Firm-Toren, McGeady and Stanger [57] ABSTRACT A surface treatment of a tin-plated steel sheet which comprises electrolyzing the tin-plated steel sheet as cathode with a quantity of electricity between 1 and 50 c/dm in an aqueous solution containing 1 to 50 g/l of at least one of aluminum dihydrogenphosphate, aluminum monohydrogenphosphate and their mixture.
2 Claims, No Drawings SURFACE TREATMENT OF TIN-PLATED STEEL SHEETS The present invention relates to surface treatment of tin-plated steel sheets, and more particularly relates to the surface treatment of tin-plated steel sheets for the purpose of prevention of damage to the sheet otherwise caused during a can-making process or during transportation.
conventionally, electro-tin-plated steel sheets are subject to a passivation treatment after electro-tin plating in order to prevent oxidation of the surface of the tin-plated steel sheet.
As for the passivation treatment, an electrolytic treatment in a sodium bichromate bath has been widely used. This electrolytic treatment, although very useful for preventing abnormal increase of the tin oxide, has a defect in that a small amount of chromium oxide in the surface adheres and accumulates on the piler and tools in the can-making line and causes damages to the surface of the tin-plated steel sheet.
In order to eliminate the above defect, lubricating oil is applied on the surface of the tin-plated steel sheet, but complete prevention of the surface damage can not be attained because the amount of the oil coating is limited for other reasons.
The surface damage deteriorates not only the outer appearance of a can but also its corrosion resistance. Therefore, there has been a strong demand for development of a complete method for preventing the surface damage which satisfies both the productivity and economy requirements.
The present inventors have conducted various studies and experiments on surface treatments which satisfy the oxidation (passivation) of tin and are effective to prevent the surface damage, and have discovered that the formation of a phosphate film is most effective for this purpose. Then the present inventors have con- The reason for limiting the concentration of aluminum dihydrogenphosphate Al (H PO aluminum monohydrogenphosphate Al (HPO or their mixture to the range from 1 to g/l is that if the concentration is less than 1 g/l, an effective film for preventing the surface damage is not formed and if the concentration is more than 50 g/l, there is a tendency for deterioration of the surface brightness other than the surface damage problem.
Meanwhile, the pH value of the aqueous solution is maintained to 3 or less since if the pH value exceeds 3, the surface brightness is deteriorated.
As for the bath temperature, better results can be obtained when it is between 20 and 80C.
When the tin-plated steel sheet is electrolyzed as a cathode under the above conditions, this treatment is performed with a quantity of electricity between 1 c/dm and 50 cldm When the quantity of electricity is less than 1 c/dm oxidation resistance of the tinplated steel sheet is unsatisfactory and on the other hand when it is larger than 50 c/dm the outer appearance of the tin-plated steel sheet deteriorates and solderability of the sheet is poor.
The tin-plated steel sheet, when treated under the above conditions, possesses very excellent properties.
The present invention will be more clearly, understood from the following examples.
EXAMPLE 1 A low carbon steel sheet of 0.23 mm thickness produced from an ordinary method was degreased in a caustic soda solution and then acid-pickled in a sulfuric acid solution. The surface-cleaned steel sheet was subjected to electro-tin-plating in a stannous phenolsulfonate electrolyte to give a tin coating of 12 g/m the thus tin-plated steel sheet heated to 270C to melt the tin to obtain mirror brightness, and then treated under the following conditions.
Treating bath:
Temperature:
Electrolysis conditions:
dUCIed f r her u ie 1 a m h f r f rming h 50 The tin-plated steel sheet was electrolyzed as acathode with a direct current.
EXAMPLE 2:
A tin-plated steel sheet prepared by the method of Example 1 was treated as a cathode under the following conditions.
Treating bath Temperature Electrolysis conditions Aluminum 30 g/l monohydrogcnphosphate Phosphoric acid 10 g/l Current density 8 A/dm Time 2 seconds EXAMPLE 3:
A tin-plated steel sheet prepared by the method of Example 1 was treated as a cathode under the following conditions.
Treating bath: Aluminum dihydrogenphosphatc l g/l A tin-plated steel sheet prepared by the method of Example 1 was treated as a cathode under the following conditions.
EXAMPLE 6:
A tin-plated steel sheet prepared by the same method as in Example 1 was treated as a cathode under the following conditions.
Treating bath Sodium bichromate 25 g/l pH Temperature 50C Electrolysis Current density 5 A/dm conditons:
Time 2 seconds Properties of the tin-plated steel sheets treated by the Treating bath: Aluminum monohydrogenphosphatc above examples are shown in Table 1. It IS clearly ung l dhydrogenphospham g 3/1 derstood from the table that the tin-plated steel sheets Temperature: 70C treated by the method according to the present inven- Elcctmlyss condmms g gg j 'nz tion show better oxidation resistance and remarkably better surface properties.
Table 1 Example Surfacc- Oxidation Soldcr- Lacquer- Yellow No. damage Resistance ability ability coloration Resistance Resistance g 1 o o o o o 2 5 3 0 4 o o o o o g 5 E s 5 8 We X o o o o Excellent 0 Good X Not good EXAMPLE 5':
A tin-plated steel sheet prepared by the same method as in Example 1 was treated as a cathode in a 0.5% sodium carbonate solution for 2 seconds with a current density of5 Aldm and then treated as a cathode under the following conditions.
Treating bath Aluminum 20 g/l monohydrogenphosphate Phosphoric acid 10 gl] pH 2 Temperature 70C Electrolysis conditions Current density 5 A/dm Time 2 seconds
Claims (2)
1. A SURFACE TREAMENT OF A TIN-PLATED STEEL SHEET WHICH COMPRISES ELECTROLYZING THE TIN-PLATED STEEL SHEET AS A CATHODE WITH A QUANTITY OF ELECTRICITY BETWEEN 1 AND 50 C/DM2 IN AN AQUEOUS SOLUTION CONTAINING 1 TO 50 G/L OF AT LEAST ONE OF ALUMINUM DIHYDROGENPHOSPHATE, ALUMINUM MONOHYDROGENPHOSPHATE AND THEIR MIXTURES, HAVING A PH OF 3 OR LESS.
2. A surface treatment according to claim 1 in which the aqueous solution further contains phosphoric acid.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP48086622A JPS5035042A (en) | 1973-08-01 | 1973-08-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3912601A true US3912601A (en) | 1975-10-14 |
Family
ID=13892110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US489489A Expired - Lifetime US3912601A (en) | 1973-08-01 | 1974-07-18 | Surface treatment of tin-plated steel sheets |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3912601A (en) |
| JP (1) | JPS5035042A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2290129A1 (en) * | 2008-05-12 | 2011-03-02 | JFE Steel Corporation | Process for production of tin-plated steel sheets, tin-plated steel sheets and chemical conversion treatment fluid |
| US20110104514A1 (en) * | 2008-07-04 | 2011-05-05 | Jfe Steel Corporation | Method for producing tinned steel sheet and tinned steel sheet |
| US20110168563A1 (en) * | 2008-07-10 | 2011-07-14 | Jfe Steel Corporation | Tin-plated steel sheet and method for manufacturing the same |
| US20110180185A1 (en) * | 2008-07-10 | 2011-07-28 | Jfe Steel Corporation | Tinned steel sheet and method for producing the same |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5468734A (en) * | 1977-11-11 | 1979-06-02 | Nippon Packaging Kk | Surface treatment of tin plated steel plate and can |
| JPS54119404A (en) * | 1978-03-09 | 1979-09-17 | Kanto Denka Kogyo Kk | Stabilized 1*1*11trichloroethane composition |
| FR2585349B1 (en) * | 1985-07-25 | 1988-03-04 | Solvay | STABILIZED COMPOSITIONS OF 1,1,1-TRICHLORETHANE |
| JP5626417B2 (en) * | 2013-06-19 | 2014-11-19 | Ｊｆｅスチール株式会社 | Tinned steel sheet |
| JP5626416B2 (en) * | 2013-06-19 | 2014-11-19 | Ｊｆｅスチール株式会社 | Tinned steel sheet |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3616307A (en) * | 1969-05-16 | 1971-10-26 | Bethlehem Steel Corp | Process and composition for anodizing a tincoated article |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS601610B2 (en) * | 1976-06-30 | 1985-01-16 | キヤノン株式会社 | Camera with electromagnetic release device |
-
1973
- 1973-08-01 JP JP48086622A patent/JPS5035042A/ja active Pending
-
1974
- 1974-07-18 US US489489A patent/US3912601A/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3616307A (en) * | 1969-05-16 | 1971-10-26 | Bethlehem Steel Corp | Process and composition for anodizing a tincoated article |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2290129A1 (en) * | 2008-05-12 | 2011-03-02 | JFE Steel Corporation | Process for production of tin-plated steel sheets, tin-plated steel sheets and chemical conversion treatment fluid |
| US20110091741A1 (en) * | 2008-05-12 | 2011-04-21 | Jfe Steel Corporation | Method for producing tinned steel sheet, tinned steel sheet, and chemical conversion solution |
| EP2290129A4 (en) * | 2008-05-12 | 2013-02-20 | Jfe Steel Corp | Process for production of tin-plated steel sheets, tin-plated steel sheets and chemical conversion treatment fluid |
| KR101318545B1 (en) | 2008-05-12 | 2013-10-16 | 제이에프이 스틸 가부시키가이샤 | Process for production of tin-plated steel sheets, tin-plated steel sheets and chemical conversion treatment fluid |
| US20140079886A1 (en) * | 2008-05-12 | 2014-03-20 | Jfe Steel Corporation | Method of producing tinned steel sheets |
| TWI477662B (en) * | 2008-05-12 | 2015-03-21 | Jfe Steel Corp | Method for production of tin plated steel sheet, tin plated steel sheet and chemical conversion treatment liquid |
| US20110104514A1 (en) * | 2008-07-04 | 2011-05-05 | Jfe Steel Corporation | Method for producing tinned steel sheet and tinned steel sheet |
| US20110168563A1 (en) * | 2008-07-10 | 2011-07-14 | Jfe Steel Corporation | Tin-plated steel sheet and method for manufacturing the same |
| US20110180185A1 (en) * | 2008-07-10 | 2011-07-28 | Jfe Steel Corporation | Tinned steel sheet and method for producing the same |
| US20140102907A1 (en) * | 2008-07-10 | 2014-04-17 | Jfe Steel Corporation | Tin-plated steel sheet and method for manufacturing the same |
| US8871038B2 (en) * | 2008-07-10 | 2014-10-28 | Jfe Steel Corporation | Tinned steel sheet and method for producing the same |
| US9441310B2 (en) * | 2008-07-10 | 2016-09-13 | Jfe Steel Corporation | Tin-plated steel sheet and method for manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5035042A (en) | 1975-04-03 |
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