CN1141420C - Process for electroplating Cr onto surface of thin steel sheet - Google Patents
Process for electroplating Cr onto surface of thin steel sheet Download PDFInfo
- Publication number
- CN1141420C CN1141420C CNB011076046A CN01107604A CN1141420C CN 1141420 C CN1141420 C CN 1141420C CN B011076046 A CNB011076046 A CN B011076046A CN 01107604 A CN01107604 A CN 01107604A CN 1141420 C CN1141420 C CN 1141420C
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- CN
- China
- Prior art keywords
- thin steel
- electroplating
- current density
- chromium
- plating
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Abstract
The present invention relates to a method for electroplating chromium on a thin steel plate, which is characterized in that the method comprises the following steps: firstly, plating liquids comprise the following ingredients: 80 +/-15 grams/l of CrO3, 0.4 +/-0.1 grams/l of H2SO4 and 1.5+/-0.5 g/l of H2SiF6; the plating liquid temperature is from 50-5 DEG C to 50+5DEG C, the current density is from 30 to 50 A/dm<2>, and the electroplating time is from 2.2-0.2 to 2.2+02 sec; secondly, plating liquids comprise the following ingredients: 8 to 15 g/l of CrO3, 0.1 to 0.3 g/l of H2SO4 and 0.2 to 0.4 g/l of H2SiF6; the plating liquid temperature is from 50 to 54 DEG C, the current density is zero, and the electroplating time is from 2.6-0.2 to 2.6+0.2 sec. The method of the present invention is a method of electroplating chromium on a thin steel plate with the advantages of little energy consumption and low cost; the performance of thin steel plates plated with chromium is similar to that of tinplate, and the thin steel plates can partially replace tinplate products.
Description
The present invention relates to a kind of treatment process of metallic surface.
At Cold Rolled Sheet Steel surface plating layer of metal preservative coat is a kind of common used material of packaging industry.Wherein electrolytic tinplate (tinplate) is with its erosion resistance, weldability with good be coated with seal and extension performance and be widely used as in food cans, chemical tank, various spray tank, bottle cap class and other and do assorted jar raw material.Along with the minimizing day by day of the higher tin resource of price, packaging industry is at the surrogate one electrodeposited chromium steel plate that progressively adopts electrolytic tinplate (ECCS claims Tin Free Steel again, abbreviation TFS), to substitute the material of part system jar.It is meant not zinc-plated and can replaces the steel plate of tinplate purposes, is characterized in electroplating at the thick surface of thin steel sheet of 0.19～0.50mm the material of one deck chromium and chromium hydrous oxide.Similar because of its performance and tinplate, can partly substitute the tinplate product.At present, adopt two-step approach in the chromium plating of successive surface of thin steel sheet, processing condition are as follows: the first step: plating bath CrO
3Concentration 130～150g/l, 49～55 ℃ of bath temperatures, current density 54～86A/d m
2Second step: plating bath CrO
3Concentration 30g/l, 55～60 ℃ of bath temperatures, current density 16A/d m
2Plating bath CrO
3Concentration is higher, and is serious to equipment corrosion, and current density is higher, and energy consumption is big.
The purpose of this invention is to provide a kind of power consumption still less, lower-cost surface of thin steel sheet chrome-plating method.
Purpose of the present invention is realized by following steps:
The first step: solution composition: CrO
380 ± 15g/l
H
2SO
4 0.4±0.1g/l
H
2SiF
6 1.5±0.5g/l
Bath temperature: 50 ± 5 ℃
Current density: 35～65A/d m
2
Electroplating time: 2.2 ± 0.2sec..
Second step: solution composition: CrO
38～15g/l
H
2SO
4 0.1～0.3g/l
H
2SiF
6 0.2～0.4g/l
Bath temperature: 50～54 ℃
Current density: 0
Electroplating time: 2.6 ± 0.2sec..
Can find out that from external embodiment the concentration the first step of plating bath is 130-150g/l, second step is for 30g/l, respectively than the high 50～70g/l of this law and 15～20g/l.Because CrO
3Solution is stronger etching reagent, and CrO is looked in the corrosion of equipment
3Concentration height and different.This law is because CrO
3Concentration is low lighter relatively to equipment corrosion, and the rotproofing expense of equipment is also lower.
Among the external embodiment, the current density of the first step is 54-86A/d m
2, the current density in second step is 16A/d m
2Exceed 14-23A/d m respectively than this law
2And 16A/d m
2Particularly second step, this law has realized no power, has reduced the consumption of electric energy like this, has reduced production cost.Table 1 is embodiment; Table 2 is that the effect of different electro-plating methods compares.
Embodiment
The first step: electroplating time: 2.2 ± 0.2sec.; Second step: electroplating time: 2.6 ± 0.2sec..Table 1 embodiment
Annotate: raw sheet area 9 * 7.12dm
2The effect of the different electro-plating methods of table 2 relatively
| Sample | The first step | Second step | Chromium plating amount mg/m 2 | Chromium hydrous oxide amount mg/ m 2 | ||||
| Current density front/reverse side A/d m 2 | Bath temperature ℃ | Plating bath CrO 3Concentration g/l | Current density front/reverse side A/d m 2 | Bath temperature ℃ | Plating bath CrO 3Concentration g/l | |||
| Example 1 | 60/63 | 55 | 72～ 80 | 0 | 55 | 10～ 15 | 146.6 | 12.8 |
| Example 2 | 49/40 | 52 | 0 | 55 | 52 | 12.1 | ||
| Example 3 | 56/56 | 50 | 0 | 55 | 45.5 | 12.8 | ||
| Example 4 | 53/53 | 51 | 0 | 52 | 60.8 | 11.5 | ||
| Example 5 | 61/51 | 51 | 0 | 58 | 53.5 | 11.5 | ||
Unit: mg/m
2
| Total chrome | The chromium plating amount | The chromium hydrous oxide | |
| ISO 11950 | ≥50 | ≥7 | |
| Present method | 58.3-159.4 | 45.5-146.6 | 11.5-12.8 |
| External product | 67.4 | 57 | 10.4 |
Claims (1)
1. the method for an electroplating Cr onto surface of thin steel sheet adopts two-step approach, it is characterized in that the first step: solution composition: CrO
380 ± 15g/l, H
2SO
40.4 ± 0.1g/l, H
2SiF
61.5 ± 0.5g/l; Bath temperature: 50 ± 5 ℃; Current density: 35～65A/d m
2Electroplating time: 2.2 ± 0.2sec.; Second step: solution composition: CrO
38～15g/l, H
2SO
40.1～0.3g/l, H
2SiF
60.2～0.4g/l; Bath temperature: 50～54 ℃; Current density: 0; Electroplating time: 2.6 ± 0.2sec..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011076046A CN1141420C (en) | 2001-02-27 | 2001-02-27 | Process for electroplating Cr onto surface of thin steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011076046A CN1141420C (en) | 2001-02-27 | 2001-02-27 | Process for electroplating Cr onto surface of thin steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1316551A CN1316551A (en) | 2001-10-10 |
| CN1141420C true CN1141420C (en) | 2004-03-10 |
Family
ID=4656520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011076046A Expired - Lifetime CN1141420C (en) | 2001-02-27 | 2001-02-27 | Process for electroplating Cr onto surface of thin steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1141420C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5335595B2 (en) * | 2009-02-16 | 2013-11-06 | 新日鐵住金ステンレス株式会社 | Chrome-plated stainless steel plate with excellent post-processing corrosion resistance |
| CN103122470B (en) * | 2011-11-17 | 2015-12-09 | 符士正 | Automobile cast iron die plating solution |
| EP2922984B1 (en) * | 2012-11-21 | 2018-11-14 | Tata Steel IJmuiden BV | Method for producing chromium-chromium oxide coatings applied to steel substrates for packaging applications |
| CN104818483A (en) * | 2015-04-13 | 2015-08-05 | 南京理工大学 | Medium carbon CrNiMo steel surface chromium-tantalum gradient coating and preparation method thereof |
| CN104928677A (en) * | 2015-07-16 | 2015-09-23 | 胡家辉 | Method for combining galvanic chrome plating of carbon steel or alloy aluminum with vacuum titanizing |
| CN113529141B (en) * | 2021-06-17 | 2022-11-18 | 首钢集团有限公司 | Tin-chromium composite coating steel plate and preparation method thereof |
-
2001
- 2001-02-27 CN CNB011076046A patent/CN1141420C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1316551A (en) | 2001-10-10 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 528400 No. 25, Dong Yi Road, Torch Development Zone, Guangdong, Zhongshan Patentee after: Yuehai Zhongyue (Zhongshan) tinplate Industry Co., Ltd Address before: 528437 Torch Development Zone, Zhongshan port, Zhongshan, Guangdong Patentee before: ZHONGSHAN ZHONGYUE TINPLATE INDUSTRIAL Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20040310 |
|
| CX01 | Expiry of patent term |