CN214088701U - Coating structure for plating trivalent chromium and white chromium on aluminum alloy die casting - Google Patents
Coating structure for plating trivalent chromium and white chromium on aluminum alloy die casting Download PDFInfo
- Publication number
- CN214088701U CN214088701U CN202020425337.8U CN202020425337U CN214088701U CN 214088701 U CN214088701 U CN 214088701U CN 202020425337 U CN202020425337 U CN 202020425337U CN 214088701 U CN214088701 U CN 214088701U
- Authority
- CN
- China
- Prior art keywords
- aluminum alloy
- chromium
- plating layer
- trivalent chromium
- white
- 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.)
- Active
Links
Images
Landscapes
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The utility model discloses an aluminum alloy die casting trivalent chromium plates cladding material structure of white chromium, including the aluminum alloy base member and the zinc dipping layer, acid zinc-nickel alloy cladding material, chemical nickel coating, pyrophosphate copper plate, acid copper coating, bright nickel coating, the white chromium coating of trivalent chromium that prepare in proper order from inside to outside on the aluminum alloy base member. The utility model discloses a trivalent chromium white chromium cladding material structure, preparation technology environmental protection carries out neutral salt fog test 96 hours according to GB/T10125 supplementarian atmosphere corrosion test salt fog test 2012, plates a surperficial no corrosive substance and generates, has good corrosion resistance.
Description
Technical Field
The utility model belongs to the metal plating field, concretely relates to white chromium plating layer structure is plated to aluminum alloy die casting trivalent chromium.
Background
The trivalent chromium white chromium plating layer has excellent wear resistance and corrosion resistance, and is widely applied to protective and decorative electroplating of hardware products and automobile accessories. The fittings such as automobile aluminum alloy keel and the like generally adopt trivalent chromium plated white chromium or black chromium plated as surface layers. The preparation process includes preparing zinc dipping layer on the aluminum alloy base, covering the pores with cyanide copper plating to form the pre-plated layer, and plating copper, nickel and trivalent chromium.
Because of the extreme toxicity of cyanide, the cyanide does not meet the industrial policy made by the national institutes of development and improvement "catalog for guidance of industrial structure adjustment" (2011).
SUMMERY OF THE UTILITY MODEL
In order to solve the pollution problem that the white chromium plating coat of aluminium alloy die casting preparation trivalent chromium uses cyanide copper facing of high toxicity to bring, the utility model provides an aluminium alloy die casting trivalent chromium plates white chromium's cladding material structure. In order to achieve the purpose, the utility model adopts the following technical scheme:
a coating structure for plating white chromium on trivalent chromium of an aluminum alloy die casting comprises an aluminum alloy substrate, and a zinc dipping layer, an acid zinc-nickel alloy coating, a chemical nickel plating layer, a pyrophosphate copper plating layer, an acid copper plating layer, a bright nickel coating and a trivalent chromium white chromium coating which are sequentially prepared on the aluminum alloy substrate from inside to outside.
Preferably, the thickness of the trivalent chromium white chromium coating is 0.2-0.8 μm.
Preferably, the thickness of the acidic zinc-nickel alloy coating is 8-12 μm.
Preferably, the thickness of the electroless nickel plating layer is 2-3 μm.
Preferably, the pyrophosphate copper plating layer has a thickness of 6 to 8 μm.
Preferably, the thickness of the acid copper plating layer is 16-18 μm.
Preferably, the thickness of the bright nickel coating is 8-10 μm.
The surface of the aluminum alloy die casting is provided with a certain number of pores. The acidic zinc-nickel alloy plating solution has higher dispersing capacity and deep plating capacity, and the plating layer has higher corrosion resistance. After the aluminum alloy die casting is soaked with zinc, acid zinc-nickel alloy is electroplated, so that the pores on the surface of the aluminum alloy die casting can be effectively sealed, and the corrosion resistance of the aluminum alloy die casting can be improved. Chemical nickel plating can be carried out on the zinc-nickel alloy plating layer, pyrophosphate copper plating can be carried out on the chemical nickel plating layer, and the binding force is good, so that the method is feasible by replacing the traditional cyanide copper plating with the electroplating acid zinc-nickel alloy and the chemical nickel plating.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a coating structure for plating white chromium on trivalent chromium of aluminum alloy die castings, which adopts electroplating acid zinc-nickel alloy to prepare a bottom coating, can effectively seal the pores on the surface layer of the aluminum alloy die castings and improve the corrosion resistance of the coating;
2. the electroplating of acidic zinc-nickel alloy and chemical nickel plating are adopted to replace cyanide copper plating, so that the limitation of using highly toxic cyanide in the existing preparation process and the potential safety hazard caused by the limitation are eliminated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, do not constitute a limitation of the invention, and in which:
FIG. 1 is a schematic diagram of the structure of the plating layer in examples 1 and 2 of the present invention.
Detailed Description
The invention will be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided to explain the invention, but not to limit the invention.
Example 1:
as shown in figure 1, the coating structure for plating white chromium on trivalent chromium of the aluminum alloy die casting comprises an aluminum alloy substrate 1, and a zinc dipping layer 2, an acid zinc-nickel alloy plating layer 3, an electroless nickel plating layer 4, a pyrophosphate copper plating layer 5, an acid copper plating layer 6, a bright nickel plating layer 7 and a trivalent chromium white chromium plating layer 8 which are sequentially prepared on the aluminum alloy substrate 1 from inside to outside.
The zinc dipping layer 2 is prepared by adopting AZIN-113 acid aluminum zinc-depositing agent produced by ultra-high chemical industry: 50-250 mL/L of AZIN-113 acidic aluminum zinc deposition agent, working temperature of 15-30 ℃, zinc deposition liquid pH range of 3.4-4.2, and zinc deposition time of 20-80 s.
The thickness of the acid zinc-nickel alloy coating 3 is 8-12 mu m, and the acid zinc-nickel alloy coating is prepared by adopting a DETRONZIN 1377 acid zinc-nickel alloy electroplating process in ultra-bonding chemical industry. The plating solution comprises the following components and operating conditions: 22-30 g/L of zinc, 22-30 g/L of nickel, 160-190 g/L of potassium chloride, 45-75 g/L of ammonium chloride, 10-20 mL/L of DETRONZIN 1377A Base auxiliary agent, 0.5-1.5 mL/L of DETRONZIN 1377B Bri main light agent, 10-20 mL/L of DETRONZIN 1377C Complex complexing agent, 8-12 mL/L of DETRONZIN 1377D Additive, 27-31 ℃ of plating bath temperature, 4.6-5.2 of pH range and 0.5-3.5A/dm of cathode current density2The cathode is moved 3-5 m/min.
The thickness of the chemical nickel-plating layer 4 is 2-3 mu m, and the chemical nickel-plating layer is prepared by adopting GG-178 alkaline chemical nickel-plating process of ultra-high chemical industry. The plating solution components and the operation conditions are as follows: 25-50 mL/L of GG-178A additive, 25-40 mL/L of GG-178B reducing agent, 30-60 mL/L of GG-178C stabilizer, 25-38 ℃ of operation temperature, 8.5-9.5 of pH value and 8-15 min of time.
The pyrophosphate copper plating layer 5 is 6-8 microns thick and is prepared by adopting the existing pyrophosphate copper plating process.
The thickness of the acid copper plating layer 6 is 16-18 mu m, and the acid copper plating layer is prepared by adopting the existing acid copper plating process.
The thickness of the bright nickel plating layer 7 is 8-10 mu m, and the bright nickel plating layer is prepared by adopting the existing bright nickel plating process.
The thickness of the trivalent chromium white chromium coating 8 is 0.5-0.7 mu m, and the trivalent chromium white chromium coating is prepared by a chromium plating process of Trich-6561 chloride in the ultra-high chemical industry. The plating solution components and the operation conditions are as follows: 400-450 g/L of bicinching salt of the nch-6561, 65-85 mL/L of complexing agent of the nch-6563, 1-2 mL/L of stabilizing agent of the nch-6564 and 1-3 mL/L of wetting agent of the nch-6565, wherein the mass concentration of trivalent chromium is23-25 g/L, boric acid mass concentration of 55-60 g/L, pH range of 2.5-3.0, operation temperature of 25-36 ℃, and cathode current density of 8-16A/dm2And stirring with medium air, and electroplating for 3-5 min.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the aluminum alloy die casting 1 is subjected to the steps of "chemical wax removal → water washing → ultrasonic wax removal → water washing → chemical degreasing → water washing → activation → water washing".
2. Zinc dipping: the pretreated aluminum alloy part 1 is subjected to the steps of "first zincing → water washing → zinc annealing → water washing → second zincing → water washing" to prepare the zinced layer 2.
3. Electroplating zinc-nickel alloy: and preparing an acidic zinc-nickel alloy coating 3 on the zinc dipping layer 2 by adopting a DETRONZIN 1377 acidic zinc-nickel alloy electroplating process.
4. Chemical nickel plating: and preparing a chemical nickel-plating layer 4 on the zinc-nickel alloy plating layer 3 by adopting a GG-178 alkaline chemical nickel-plating process.
5. Pyrophosphate copper plating: a pyrophosphate copper plating layer 5 is prepared on the electroless nickel plating layer 4.
6. Acid copper plating: an acid copper plating layer 6 is prepared on the pyrophosphate copper plating layer 5.
7. Plating bright nickel: a bright nickel plating layer 7 is prepared on the acid copper plating layer 6.
8. Trivalent chromium plating: and preparing a trivalent chromium white chromium plating layer 8 on the bright nickel plating layer 7 by adopting a chromium trivalent plating process of chloride of Tricholoma-6561.
Example 2:
as shown in figure 1, the coating structure for plating white chromium on trivalent chromium of the aluminum alloy die casting comprises an aluminum alloy substrate 1, and a zinc dipping layer 2, an acid zinc-nickel alloy plating layer 3, an electroless nickel plating layer 4, a pyrophosphate copper plating layer 5, an acid copper plating layer 6, a bright nickel plating layer 7 and a trivalent chromium white chromium plating layer 8 which are sequentially prepared on the aluminum alloy substrate 1 from inside to outside.
The zinc dipping layer 2 is prepared by adopting AZIN-113 acid aluminum zinc-depositing agent produced by ultra-high chemical industry, and is the same as the embodiment 1.
The thickness of the acid zinc-nickel alloy coating 3 is 8-12 mu m, and the acid zinc-nickel alloy coating is prepared by adopting a DETRONZIN 1377 acid zinc-nickel alloy electroplating process in ultra-high chemical engineering, and is the same as the embodiment 1.
The thickness of the chemical nickel-plating layer 4 is 2-3 mu m, and the chemical nickel-plating layer is prepared by adopting GG-182 alkaline chemical nickel-plating process of ultra-bonding chemical industry. The plating solution components and the operation conditions are as follows: 40-60 mL/L of GG-182A additive, 30-50 mL/L of GG-182B reducing agent, 30-50 mL/L of GG-182C stabilizer, 30-50 ℃ of operation temperature, 8.5-9.5 of pH range and 8-15 min of time.
The pyrophosphate copper plating layer 5 is 6-8 microns thick and is prepared by adopting the existing pyrophosphate copper plating process.
The thickness of the acid copper plating layer 6 is 13-16 mu m, and the acid copper plating layer is prepared by adopting the existing acid copper plating process.
The thickness of the bright nickel plating layer 7 is 7-9 mu m, and the bright nickel plating layer is prepared by adopting the existing bright nickel plating process.
The thickness of the trivalent chromium white chromium coating 8 is 0.2-0.3 mu m, and the coating is prepared by a tricoh-9551 sulfate trivalent chromium plating process of ultra-bonding chemical industry. The plating solution components and the operation conditions are as follows: 8-12 mL/L of Trich-9551M jar-opening salt, 260-300 mL/L of Trich-9551B supplement and 260-300 g/L of Trich-9551 CS conductive salt, wherein the mass concentration of trivalent chromium is 12-18 g/L, the mass concentration of boric acid is 65-75 g/L, the pH range is 3.4-3.8, the operating temperature is 50-55 ℃, and the cathode current density is 8-15A/dm2Slightly stirring with air or moving a cathode, and electroplating for 3-5 min.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the aluminum alloy die casting 1 is subjected to the steps of "chemical wax removal → water washing → ultrasonic wax removal → water washing → chemical degreasing → water washing → activation → water washing".
2. Zinc dipping: the pretreated aluminum alloy part 1 is subjected to the steps of "first zincing → water washing → zinc annealing → water washing → second zincing → water washing" to prepare the zinced layer 2.
3. Electroplating zinc-nickel alloy: and preparing an acidic zinc-nickel alloy coating 3 on the zinc dipping layer 2 by adopting a DETRONZIN 1377 acidic zinc-nickel alloy electroplating process.
4. Chemical nickel plating: and preparing a chemical nickel-plating layer 4 on the zinc-nickel alloy plating layer 3 by adopting a GG-182 alkaline chemical nickel-plating process.
5. Pyrophosphate copper plating: a pyrophosphate copper plating layer 5 is prepared on the electroless nickel plating layer 4.
6. Acid copper plating: an acid copper plating layer 6 is prepared on the pyrophosphate copper plating layer 5.
7. Plating bright nickel: a bright nickel plating layer 7 is prepared on the acid copper plating layer 6.
8. Trivalent chromium plating: and preparing a trivalent chromium white chromium plating layer 8 on the bright nickel plating layer 7 by adopting a chromium plating process of trivalent chromium by using a Trich-9551 sulfate.
The electroplated parts prepared in the embodiments 1 and 2 are subjected to a neutral salt spray test for 96h according to GB/T10125-2012 salt spray test for artificial atmosphere corrosion test, and no corrosive substances are generated on the surfaces of the electroplated parts.
The plated articles prepared in examples 1 and 2 were tested for plating adhesion by thermal shock test according to JB 2111-. And (3) heating the plated part to 190 ℃ in a heating furnace, taking out the plated part, and placing the plated part into water at room temperature for sudden cooling, wherein the plated layer does not generate bubbles and fall off, and the plated layer has good bonding force.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the description should not be construed as a limitation to the present invention.
Claims (7)
1. The utility model provides an aluminum alloy die casting trivalent chromium plates cladding material structure of white chromium which characterized in that: the acid zinc-nickel alloy plating solution comprises an aluminum alloy substrate, and a zinc dipping layer, an acid zinc-nickel alloy plating layer, a chemical nickel plating layer, a pyrophosphate copper plating layer, an acid copper plating layer, a bright nickel plating layer and a trivalent chromium white chromium plating layer which are sequentially prepared on the aluminum alloy substrate from inside to outside.
2. A coating structure for white chrome plating of trivalent chromium for aluminum alloy die castings according to claim 1, wherein: the thickness of the trivalent chromium white chromium coating is 0.2-0.7 mu m.
3. A coating structure for white chrome plating of trivalent chromium for aluminum alloy die castings according to claim 1, wherein: the thickness of the acid zinc-nickel alloy coating is 8-12 mu m.
4. A coating structure for white chrome plating of trivalent chromium for aluminum alloy die castings according to claim 1, wherein: the thickness of the chemical nickel plating layer is 2-3 mu m.
5. A coating structure for white chrome plating of trivalent chromium for aluminum alloy die castings according to claim 1, wherein: the pyrophosphate copper plating layer is 6-8 μm thick.
6. A coating structure for white chrome plating of trivalent chromium for aluminum alloy die castings according to claim 1, wherein: the thickness of the acid copper plating layer is 16-18 mu m.
7. A coating structure for white chrome plating of trivalent chromium for aluminum alloy die castings according to claim 1, wherein: the thickness of the bright nickel coating is 8-10 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020425337.8U CN214088701U (en) | 2020-03-27 | 2020-03-27 | Coating structure for plating trivalent chromium and white chromium on aluminum alloy die casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020425337.8U CN214088701U (en) | 2020-03-27 | 2020-03-27 | Coating structure for plating trivalent chromium and white chromium on aluminum alloy die casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214088701U true CN214088701U (en) | 2021-08-31 |
Family
ID=77417572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020425337.8U Active CN214088701U (en) | 2020-03-27 | 2020-03-27 | Coating structure for plating trivalent chromium and white chromium on aluminum alloy die casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214088701U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115433980A (en) * | 2022-08-18 | 2022-12-06 | 广州超邦化工有限公司 | Trivalent chromium plating method for neodymium iron boron workpiece |
-
2020
- 2020-03-27 CN CN202020425337.8U patent/CN214088701U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115433980A (en) * | 2022-08-18 | 2022-12-06 | 广州超邦化工有限公司 | Trivalent chromium plating method for neodymium iron boron workpiece |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102605393B (en) | Ni-W-Fe-Co alloy electroplating liquid and electroplating process thereof | |
| CN204918772U (en) | A high corrosion resistance cadmium plating layer for aerospace spare part | |
| CN215481342U (en) | Coating structure for plating trivalent chromium black chromium and coating electrophoretic paint on aluminum alloy die casting | |
| CN214088701U (en) | Coating structure for plating trivalent chromium and white chromium on aluminum alloy die casting | |
| CN212103011U (en) | Coating structure of aluminum alloy die casting environment-friendly gilding | |
| CN218642831U (en) | Coating structure of black tin-nickel alloy of aluminum alloy piece plating gun | |
| CN212103010U (en) | Coating structure of gold-plated nickel alloy of zinc alloy die casting | |
| CN214088702U (en) | Plating layer structure for plating pearl chromium on trivalent chromium of aluminum alloy part | |
| CN210176975U (en) | Cadmium-cobalt alloy and trivalent chromium passivated coating structure | |
| CN212293785U (en) | Zinc alloy die casting pearl chromium plating layer structure with zinc-plated nickel alloy as bottom layer | |
| CN212640613U (en) | Coating structure for plating gold-cobalt alloy on zinc alloy die casting | |
| CN212925174U (en) | Coating structure for plating rose gold on zinc alloy die casting | |
| CN212293783U (en) | Environment-friendly plating layer structure for plating pearl chromium on steel part | |
| CN210420166U (en) | Non-cyanide cadmium titanium alloy and trivalent chromium passivation coating structure of aluminum alloy matrix | |
| CN212293784U (en) | Plating layer structure of steel part palladium-plated steel | |
| CN219586209U (en) | Plating layer structure of zinc alloy die casting gold-plated palladium alloy | |
| CN207918993U (en) | A kind of imitative golden composite plating layer structure of bright Zn-Ni alloy, high tin copper-tin alloy, ormolu | |
| CN219886209U (en) | Plating layer structure of cyanide-free gold-plated palladium alloy | |
| CN221094324U (en) | Coating structure for hanging-plating imitation gold | |
| CN108166031B (en) | Preparation method of environment-friendly zinc alloy cyanide-free cadmium plating layer structure | |
| CN218710934U (en) | Coating structure for plating zinc alloy die casting trivalent chromium with pearl chromium | |
| CN216074060U (en) | Coating structure for zinc alloy die casting plated with pearl nickel and electrophoretic painting | |
| CN212925173U (en) | Plating layer structure of palladium-plated steel of zinc alloy die casting | |
| CN217361286U (en) | Coating structure of sintered neodymium iron boron zinc-nickel alloy | |
| CN108179447B (en) | Preparation method of cyanide-free cadmium plating layer structure on aluminum alloy substrate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |