CN1049035A - A kind of technology for electroplating high anticorrossion hard chromium - Google Patents
A kind of technology for electroplating high anticorrossion hard chromium Download PDFInfo
- Publication number
- CN1049035A CN1049035A CN 89105134 CN89105134A CN1049035A CN 1049035 A CN1049035 A CN 1049035A CN 89105134 CN89105134 CN 89105134 CN 89105134 A CN89105134 A CN 89105134A CN 1049035 A CN1049035 A CN 1049035A
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- Prior art keywords
- anticorrossion
- electroplating
- chromium
- technology
- layer
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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
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
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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)
- Electroplating And Plating Baths Therefor (AREA)
Abstract
The invention belongs to a kind of functional electric chromium plating technology, it provides a kind of chromium plating bath of additive and electro-plating method that carries out of not containing in such electroplate liquid, the electrolytic coating flawless that this method forms, has very high erosion resistance, technology is simple, do not need specific equipment, can use original electroplating production facility, economic benefit is obvious.
Description
The present invention relates to a kind of technology for electroplating high anticorrossion hard chromium, particularly relate to a kind of electroplate liquid and electro-plating method that has the flawless durionise layer of superior corrosion resistance nature and form such electrodeposited chromium layers of in the iron and steel substrate, electroplating.
At present be coated with chromium coating on the functional chromed method of industrial extensive employing makes the metal base of workpiece and improve its use properties, one of main using property data of this electrolytic coating is the erosion resistance of coating.In order to improve the erosion resistance of durionise layer, all be to adopt the method that in electroplate liquid, adds additive as a rule, and the processing parameters such as proportioning of strict control cathode current density, temperature of electroplating solution and chromic acid and additive obtain a kind of good electrodeposited chromium layers of corrosion resistance nature that has a small amount of crackle or have fine crack.A kind of corrosion-resistant flawless electroplating hard chromium process is disclosed in United States Patent (USP) 3,749,652, it has used disclosed a kind of special-purpose electroplating device in United States Patent (USP) 3,619,384, makes on the metal base of workpiece and to cover that one deck is flawless, hardness is greater than the anti-corrosion electric chromium coating of 700Hv.Weak point is all not have specifically to provide the corrosion resistance index of electrodeposited chromium layers or the erosion resistance grade of CASS corrosion resistance nature test in the above-mentioned electroplating hard chromium process, and has one or the profile that needs special-purpose electroplating device and workpiece and be subjected to the problem of certain restriction or need additive and require to have the problem of the electroplating technological parameter of strict control.
The objective of the invention is to avoid above-mentioned the deficiencies in the prior art part and provide a kind of simple to operate, do not need additive or special-purpose electroplating device, the electroplating hard chromium process of the highly corrosion resistant of the steel-iron components that can on original electroplating production facility, carry out and the durionise layer of high rigidity, the corrosion resistance nature index of this electrodeposited chromium layers reaches erosion resistance class 4～10 grade of CASS test, and hardness reaches 700Hv～900Hv.
The present invention is a kind of technology for electroplating high anticorrossion hard chromium, it is a kind of method that is used for durionise layer in the substrate at iron and steel that the electroplate liquid that is made of chromic acid, sulfuric acid and trivalent chromium carries out, and it is characterized in that adopting at high cathode current density 78～83A/dm in electroplating operations
2With electroplate rather than resemble under the common situation under the condition of 73～78 ℃ of high temperature of electroplating solution, under the condition of less cathode current density and lower temperature of electroplating solution, carry out galvanized, the concentration of the chromic acid in the described electroplate liquid is in the scope of 200g/l to 250g/l, vitriolic concentration is in the scope of 2.4g/l to 3.2g/l, and chromic concentration is in the scope of 3g/l to 8g/l; The durionise layer that the present invention obtains be a kind of in the substrate of iron and steel galvanized chromium layer, it is characterized in that this durionise layer does not contain any other organism that additive constitutes, it has high corrosion resistance nature index, 22h through the test of CASS corrosion resistance nature, 49 ± 1 ℃ of tests, its erosion resistance grade is 4～10 grades; Electrodeposited chromium layers is smooth, a flawless electrolytic coating, and its hardness is in the scope of 700Hv～900Hv.
Fig. 1 be the present invention in the substrate of iron and steel without the condition of surface of durionise layer under 300 power microscopes of glossy processing
Fig. 2 is that the durionise layer of Fig. 1 passes through the glossy processing condition of surface under 300 power microscopes later on
The electroplate liquid component of one embodiment of the present of invention and the impact of performance of electroplating manipulation condition and electrodeposited chromium layers are as follows:
Present embodiment is a kind of piston rod, and material is the C45 steel, and the high frequency quenching degree is HRc＞50, and surfaceness is Ra0.5.
The electroplate liquid component
Chromic acid 240g/l
Sulfuric acid 3g/l
Trivalent chromium 6g/l
Electroplating manipulation condition
Cathode current density 80A/dm
2
74～76 ℃ of temperature of electroplating solution
The impact of performance of electrodeposited chromium layers
8 grades of CASS corrosion resistance nature test erosion resistance grades
（22h，49±1℃）
Hardness 748Hv
Smooth, the flawless of condition of surface
A kind of electrodeposited chromium technology provided by the present invention be a kind of in the substrate of iron and steel the method for the durionise of durionise layer, the electrodeposited chromium layers that adopts the present invention to obtain has high corrosion resistance nature, the erosion resistance grade that reaches corrosion resistance nature test CASS test is 4～10 grades, has higher hardness simultaneously, hardness value reaches 700Hv～900Hv, and is simple to operate, without any need for additive and special-purpose electroplating device, can directly use original electroplating production facility, economic benefit is obvious.
Claims (8)
1, a kind of technology for electroplating high anticorrossion hard chromium, it is a kind of method that is used for durionise layer in the substrate at iron and steel that the electroplate liquid that is made of chromic acid, sulfuric acid and trivalent chromium carries out, and the operational condition that it is characterized in that this method is that cathode current density is 78～83A/dm
2, temperature of electroplating solution is 73～78 ℃.
2, a kind of technology for electroplating high anticorrossion hard chromium according to claim 1 is characterized in that chromic acid in the described electroplate liquid is that amount with 200g/l to 250g/l exists.
3, a kind of technology for electroplating high anticorrossion hard chromium according to claim 1 is characterized in that sulfuric acid in the described electroplate liquid is that amount with 2.4g/l to 3.2g/l exists.
4, a kind of technology for electroplating high anticorrossion hard chromium according to claim 1 is characterized in that described trivalent chromium is that amount with 3g/l to 8g/l exists.
5, a kind of electroplating high anticorrossion hard chromium layer, it be a kind of in the substrate of iron and steel galvanized chromium layer, it is characterized in that this electrodeposited chromium layers does not contain any other organism that is made of additive.
6, a kind of electroplating high anticorrossion hard chromium layer according to claim 5 is characterized in that the corrosion resistance nature CASS test of this durionise layer, and through 22h, the corrosion-resistant grade of 49 ± 1 ℃ of tests is 4～10 grades.
7, a kind of electroplating high anticorrossion hard chromium layer according to claim 5, the hardness that it is characterized in that this durionise layer is 700Hv to 900Hv.
8, a kind of highly corrosion resistant hard chrome plating layer according to claim 5 is characterized in that this durionise layer is smooth, a flawless electrolytic coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89105134 CN1016190B (en) | 1989-07-25 | 1989-07-25 | A kind of technology for electroplating high anticorrossion hard chromium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89105134 CN1016190B (en) | 1989-07-25 | 1989-07-25 | A kind of technology for electroplating high anticorrossion hard chromium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1049035A true CN1049035A (en) | 1991-02-06 |
| CN1016190B CN1016190B (en) | 1992-04-08 |
Family
ID=4855903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89105134 Expired CN1016190B (en) | 1989-07-25 | 1989-07-25 | A kind of technology for electroplating high anticorrossion hard chromium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1016190B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812708A (en) * | 2010-04-20 | 2010-08-25 | 安徽华东光电技术研究所 | Method for plating chromium on molybdenum core rod |
| CN102465325A (en) * | 2010-11-18 | 2012-05-23 | 贵州航天风华精密设备有限公司 | Method for directly plating hard chromium on surface of tungsten alloy through constant current density |
| CN102465324A (en) * | 2010-11-18 | 2012-05-23 | 贵州航天风华精密设备有限公司 | Method for directly plating hard chromium on surface of tungsten alloy through varying current density |
| CN104087979A (en) * | 2014-06-27 | 2014-10-08 | 南阳华晨汽车零部件有限公司 | Quantitative chromium plating process |
| CN112853410A (en) * | 2021-01-06 | 2021-05-28 | 成立航空股份有限公司 | Chromium plating method for slender pull rod |
-
1989
- 1989-07-25 CN CN 89105134 patent/CN1016190B/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812708A (en) * | 2010-04-20 | 2010-08-25 | 安徽华东光电技术研究所 | Method for plating chromium on molybdenum core rod |
| CN102465325A (en) * | 2010-11-18 | 2012-05-23 | 贵州航天风华精密设备有限公司 | Method for directly plating hard chromium on surface of tungsten alloy through constant current density |
| CN102465324A (en) * | 2010-11-18 | 2012-05-23 | 贵州航天风华精密设备有限公司 | Method for directly plating hard chromium on surface of tungsten alloy through varying current density |
| CN104087979A (en) * | 2014-06-27 | 2014-10-08 | 南阳华晨汽车零部件有限公司 | Quantitative chromium plating process |
| CN112853410A (en) * | 2021-01-06 | 2021-05-28 | 成立航空股份有限公司 | Chromium plating method for slender pull rod |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1016190B (en) | 1992-04-08 |
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