CN215481342U - Coating structure for plating trivalent chromium black chromium and coating electrophoretic paint on aluminum alloy die casting - Google Patents
Coating structure for plating trivalent chromium black chromium and coating electrophoretic paint on aluminum alloy die casting Download PDFInfo
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Abstract
The utility model discloses a plating layer structure for plating trivalent chromium black chromium on an aluminum alloy die casting and coating electrophoretic paint, which comprises an aluminum alloy substrate, and a chemical zinc deposition 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, a trivalent chromium black chromium plating layer and an electrophoretic paint coating which are sequentially prepared on the aluminum alloy substrate from inside to outside. The coating structure disclosed by the utility model is environment-friendly in preparation process, and has no corrosive on the surface of a plated part and good corrosion resistance when a neutral salt spray test is carried out for 720 hours according to GB/T10125-.
Description
Technical Field
The utility model belongs to the field of metal electroplating and coating, and particularly relates to a coating structure for plating trivalent chromium black chromium and coating electrophoretic paint on an aluminum alloy die casting.
Background
The trivalent chromium black chromium plating has a simple and elegant appearance, but the wear resistance and corrosion resistance are not as high as those of the trivalent chromium white chromium plating, and the plating is easily changed from black to yellowish black. Some aluminum alloy die castings adopt trivalent chromium black chromium plating as a surface layer, and the preparation process comprises the steps of firstly preparing a chemical zinc deposition layer on an aluminum alloy substrate, then closing pores on the surface of the aluminum alloy by cyanide copper plating, using the closed pores as a pre-plating layer of a subsequent plating layer, and then plating copper, nickel and trivalent chromium black chromium.
Because cyanide is extremely toxic, it does not meet the industrial policy made by the national institutes of development and improvement in industry regulatory guide catalog (2011).
SUMMERY OF THE UTILITY MODEL
The utility model provides a plating layer structure for plating trivalent chromium black chromium on an aluminum alloy die casting and coating electrophoretic paint, aiming at solving the pollution problem caused by high-toxicity cyanide copper plating used for preparing a trivalent chromium black chromium plating layer on the aluminum alloy die casting and overcoming the technical defects of low corrosion resistance and wear resistance of the trivalent chromium black chromium plating layer. In order to achieve the purpose, the utility model adopts the following technical scheme:
a plating layer structure for plating trivalent chromium black chromium and coating electrophoretic paint on an aluminum alloy die casting comprises an aluminum alloy substrate, and a chemical zinc deposition 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, a trivalent chromium black chromium plating layer and an electrophoretic paint coating which are sequentially prepared on the aluminum alloy substrate from inside to outside;
the thickness of the trivalent chromium black chromium coating is 0.1-0.4 mu m;
the electrophoretic paint coating is colorless and transparent, and the thickness of the coating is 5-12 mu m.
Preferably, the thickness of the acid zinc-nickel alloy coating is 8-16 μm.
Preferably, the thickness of the electroless nickel plating layer is 1-4 μm.
Preferably, the pyrophosphate copper plating layer has a thickness of 6 to 12 μm.
Preferably, the thickness of the acid copper plating layer is 8-16 μm.
Preferably, the thickness of the bright nickel coating is 4-10 μm.
The surface of the aluminum alloy die casting is provided with a certain number of pores. The acid zinc-nickel alloy plating solution has higher deep plating capacity, and the plating layer has higher corrosion resistance. After the aluminum alloy die casting is chemically deposited 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 has the following beneficial effects:
1. according to the coating structure for plating the trivalent chromium black chromium on the aluminum alloy die casting and coating the electrophoretic paint, the bottom coating is prepared by electroplating the acidic zinc-nickel alloy, so that the pores on the surface layer of the aluminum alloy die casting can be effectively sealed, and the corrosion resistance of the coating is improved;
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;
3. the colorless electrophoretic paint coating is coated on the trivalent chromium black chromium coating, so that the original simple and elegant appearance of the trivalent chromium black chromium coating can be kept, and the corrosion resistance and the wear resistance of the coating can be obviously improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the principles of the utility model:
FIG. 1 is a schematic diagram of the structure of the plating layers of examples 1 and 2 of the present invention.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the present invention are provided to explain the present invention without limiting the utility model thereto.
The plating layer structure for plating the trivalent chromium black chromium on the aluminum alloy die casting and coating the electrophoretic paint comprises an aluminum alloy substrate, and a chemical zinc deposition 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, a trivalent chromium black chromium plating layer and an electrophoretic paint coating which are sequentially prepared on the aluminum alloy substrate from inside to outside.
The existing pretreatment process is adopted to carry out the working procedures of dewaxing, deoiling, brightening and activating on the aluminum alloy die casting.
After the pretreatment of the plated part, the zinc is deposited by adopting the existing chemical zinc deposition process.
Preferably, the zinc deposition layer is prepared by adopting AZIN-113 acidic aluminum zinc deposition agent produced by Guangzhou ultra-Pont chemical Co: 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 prepared zinc deposition layer contains two components of zinc and nickel.
Preferably, the preparation process adopts ALBUME AS-699 cyanide-free aluminum upper chemical zinc deposition agent of ultra-high chemical industry, and comprises the following steps: 160-230 mL/L of chemical zinc deposition agent on the ALBUME AS-699 cyanide-free aluminum, the working temperature is 20-30 ℃, and the chemical zinc deposition time is 60-120 s. The chemical zinc deposition agent comprises 6-9 g/L of zinc ions and 0.16-0.20 g/L of copper ions. The prepared zinc deposition layer contains two components of zinc and copper.
After zinc is deposited on a plated part, an existing acidic zinc-nickel alloy electroplating process is adopted to prepare an acidic zinc-nickel alloy plating layer, and the thickness of the plating layer is 8-16 microns.
Preferably, the zinc-nickel alloy plating layer is prepared by adopting a DETRONZIN 1377 acidic zinc-nickel alloy electroplating process in the ultra-bonding chemical industry: 22-30 g/L zinc, 22-30 g/L nickel, 160-190 g/L potassium chloride, 45-75 g/L ammonium chloride, 10-20 mL/L DetroNZIN 1377A Base adjuvant, 0.5-1.5 mL/L DetroNZIN 1377B Bri major oil, 10-20 mL/L DetroNZIN 1377C Complex complexing agent, and 8. mu.L DetroNZIN 1377D Additive12mL/L, the temperature of the plating bath is 27-31 ℃, the pH range is 4.6-5.2, and the cathode current density is 0.5-3.5A/dm2The cathode is moved 3-5 m/min.
After plating the zinc-nickel alloy on the plated part, preparing a chemical nickel plating layer by adopting the existing chemical nickel plating process, wherein the thickness of the plating layer is 1-4 mu m.
Preferably, the chemical nickel plating layer is prepared by adopting GG-178 alkaline chemical nickel plating process of ultra-bonding chemical industry: 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 and 8.5-9.5 of pH value.
After chemical nickel plating of a plated part, a pyrophosphate copper plating layer is prepared by adopting the existing pyrophosphate copper plating process, and the thickness of the plating layer is 6-12 microns.
After pyrophosphate copper plating of a plated part, an acid copper plating layer is prepared by adopting the existing acid copper plating process, and the thickness of the plating layer is 8-16 mu m.
And plating bright nickel on the plated part by adopting the existing bright nickel plating process after plating the acid copper, wherein the thickness of the plating layer is 4-10 mu m.
Plating a trivalent chromium black chromium coating after plating bright nickel on the plated part, wherein the thickness of the coating is 0.1-0.4 mu m.
Preferably, the black chromium plating layer of trivalent chromium is prepared by adopting a black chromium plating process of superconchemical Trich-7677 sulfate trivalent chromium: 8-12 mL/L of a Trich-7677S initiator, 260-300 mL/L of a Trich-7677M cylinder opener, 260-300 g/L of a Trich-7677 CS conductive salt, 3-4 mL/L of a Trich-7677C stabilizer and 2-5 mL/L of a Trich-7677D toner, wherein the mass concentration of trivalent chromium is 12-20 g/L, the mass concentration of boric acid is 55-70 g/L, the pH range is 3.3-3.7, the operating temperature is 25-40 ℃, and the cathode current density is 8-14A/dm2Cathode movement or slight air agitation.
And after plating the trivalent chromium black chromium on the plated part, coating electrophoretic paint, wherein the thickness of the electrophoretic paint coating is 5-12 mu m.
Preferably, the electrophoretic paint coating is prepared by adopting an AKINI 120 electrophoresis process of ultra-high chemical engineering: 300-350 g/L of AKINI 120 electrophoretic paint, 4-5 pH of an electrophoretic bath solution, 25-30 ℃ of operation temperature, 30-60V of bath voltage and 20-60 s of electrophoresis time, and drying for 30-50 min at 120-140 ℃ after washing.
Example 1:
as shown in figure 1, the coating structure for plating trivalent chromium black chromium and coating electrophoretic paint on the aluminum alloy die casting comprises an aluminum alloy substrate 1, and a chemical zinc deposition layer 2, an acid zinc-nickel alloy coating layer 3, a chemical nickel plating layer 4, a pyrophosphate copper plating layer 5, an acid copper plating layer 6, a bright nickel plating layer 7, a trivalent chromium black chromium plating layer 8 and an electrophoretic paint coating layer 9 which are sequentially prepared on the aluminum alloy substrate 1 from inside to outside.
The chemical zinc deposition layer 2 is prepared by adopting AZIN-113 acid aluminum zinc deposition agent produced by ultra-high chemical industry: 200mL/L of AZIN-113 acidic aluminum zinc deposition agent, 25 ℃ of working temperature, 3.8 of pH of zinc deposition liquid and 50s of zinc deposition time.
The thickness of the acid zinc-nickel alloy coating 3 is 10-12 μm, 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: 25g/L of zinc, 25g/L of nickel, 170g/L of potassium chloride, 50g/L of ammonium chloride, 15mL/L of DETRONZIN 1377A Base auxiliary agent, 1.0mL/L of DETRONZIN 1377B Bri main light agent, 13mL/L of DETRONZIN 1377C Complex complexing agent, 9mL/L of DETRONZIN 1377D Additive, 30 ℃ of plating bath temperature, 4.8 of pH and 2.0A/dm of cathode current density2The cathode was moved 5 m/min.
The thickness of the chemical nickel-plating layer 4 is 2-3 μm, and the chemical nickel-plating layer is prepared by adopting GG-178 alkaline chemical nickel-plating process of ultra-bonding chemical industry: 35mL/L of GG-178A additive, 30mL/L of GG-178B reducing agent, 40mL/L of GG-178C stabilizer, 35 ℃ of operation temperature, 9 of pH value and 10min of plating 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 10-12 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 black chromium plating layer 8 is 0.1-0.2 mu m, and the trivalent chromium black chromium plating layer is prepared by adopting a Trich-7677 sulfate trivalent chromium black chromium plating process of ultra-bonding chemical industry: 10mL/L of a Trich-7677S initiator, 280mL/L of a Trich-7677M jar opener, 260g/L of a Trich-7677 CS conductive salt, 3mL/L of a Trich-7677C stabilizer and 3mL/L of a Trich-7677D toning agent2mL/L of the agent, wherein the mass concentration of trivalent chromium is 13g/L, the mass concentration of boric acid is 60g/L, the pH value is 3.4, the operation temperature is 30 ℃, and the cathode current density is 10A/dm2The cathode is moved or slightly stirred by air, and the electroplating time is 3 min.
The thickness of the electrophoretic paint coating 9 is 6-8 μm, and the electrophoretic paint coating is prepared by adopting an AKINI 120 electrophoresis process in ultra-high-level chemical industry: 320g/L of AKINI 120 electrophoretic paint, the pH value of the electrophoretic bath solution is 4.5, the operating temperature is 28 ℃, the bath voltage is 40V, the electrophoretic time is 25s, the electrophoretic time is 28s, and the electrophoretic bath solution is dried for 40min at 130 ℃ after being washed with water.
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 → nitric acid light extraction with a volume fraction of 25% >, water washing → activation → water washing".
2. Chemical zinc deposition: the aluminum alloy die casting 1 after the pretreatment is subjected to the processes of "first zinc dipping → water washing → zinc removing → water washing → second zinc dipping → water washing" to prepare the chemical zinc deposition layer 2.
3. Electroplating zinc-nickel alloy: and preparing an acidic zinc-nickel alloy coating 3 on the chemical zinc deposition 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. Plating trivalent chromium black chromium: and preparing a trivalent chromium black chromium plating layer 8 on the bright nickel plating layer 7 by adopting a Trich-7677 sulfate trivalent chromium black chromium plating process.
9. Electrophoretic painting: and preparing the electrophoretic painting coating 9 on the trivalent chromium black chromium plating layer by adopting an AKINI 120 electrophoretic process.
Example 2:
as shown in figure 1, the coating structure for plating trivalent chromium black chromium and coating electrophoretic paint on the aluminum alloy die casting comprises an aluminum alloy substrate 1, and a chemical zinc deposition layer 2, an acid zinc-nickel alloy coating layer 3, a chemical nickel plating layer 4, a pyrophosphate copper plating layer 5, an acid copper plating layer 6, a bright nickel plating layer 7, a trivalent chromium black chromium plating layer 8 and an electrophoretic paint coating layer 9 which are sequentially prepared on the aluminum alloy substrate 1 from inside to outside.
The chemical zinc deposition layer 2 is prepared by adopting an ALBUME AS-699 cyanide-free aluminum upper chemical zinc deposition agent in ultra-high chemical industry: the chemical zinc deposition agent on the ALBUME AS-699 cyanide-free aluminum is 200mL/L, the working temperature is 25 ℃, and the chemical zinc deposition time is 80 s.
The thickness of the acid zinc-nickel alloy coating 3 is 12-14 μm, 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: 28g/L of zinc, 28g/L of nickel, 180g/L of potassium chloride, 55g/L of ammonium chloride, 15mL/L of DETRONZIN 1377A Base auxiliary agent, 1.0mL/L of DETRONZIN 1377B Bri main light agent, 18mL/L of DETRONZIN 1377C Complex complexing agent, 10mL/L of DETRONZIN 1377D Additive, 30 ℃ of plating bath temperature, 4.8 of pH and 2.2A/dm of cathode current density2The cathode was moved 4 m/min.
The thickness of the chemical nickel-plating layer 4 is 2-3 μm, and the chemical nickel-plating layer is prepared by adopting GG-178 alkaline chemical nickel-plating process of ultra-bonding chemical industry: 45mL/L of GG-178A additive, 35mL/L of GG-178B reducing agent, 50mL/L of GG-178C stabilizer, 35 ℃ of operation temperature, 9.2 of pH value and 10min of plating time.
The pyrophosphate copper plating layer 5 is 8-10 microns thick and is prepared by adopting the existing pyrophosphate copper plating process.
The thickness of the acid copper plating layer 6 is 8-10 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 black chromium plating layer 9 is 0.1-0.2 mu m, and the trivalent chromium black chromium plating layer is prepared by adopting a Trich-7677 sulfate black chromium plating process of ultra-bonding chemical industry: 10mL/L of a Trich-7677S initiator, 300mL/L of a Trich-7677M cylinder opener, 300g/L of a Trich-7677 CS conductive salt, 4mL/L of a Trich-7677C stabilizer and 3mL/L of a Trich-7677D toner, wherein the mass concentration of trivalent chromium is 16g/L, and the mass concentration of boric acid is 68g/L, pH 3.6, operating temperature 40 deg.C, cathode current density 12A/dm2The cathode is moved or slightly stirred by air, and the electroplating time is 2 min.
The thickness of the electrophoretic paint coating 9 is 8-10 mu m, and the electrophoretic paint coating is prepared by adopting an AKINI 120 electrophoresis process in ultra-high-level chemical industry: 330g/L of AKINI 120 electrophoretic paint, the pH value of the electrophoretic bath solution is 4.5, the operating temperature is 30 ℃, the bath voltage is 40V, the electrophoresis time is 28s, and the product is dried for 40min at 130 ℃ after being washed by water.
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 → nitric acid light extraction with a volume fraction of 25% >, water washing → activation → water washing".
2. Chemical zinc deposition: the aluminum alloy part 1 after the pretreatment is subjected to the processes of "first zinc dipping → water washing → zinc removing → water washing → second zinc dipping → water washing" to prepare the chemical zinc deposition layer 2.
3. Electroplating zinc-nickel alloy: and preparing an acidic zinc-nickel alloy coating 3 on the chemical zinc deposition 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. Plating trivalent chromium black chromium: and preparing a trivalent chromium black chromium plating layer 8 on the bright nickel plating layer 7 by adopting a Trich-7677 sulfate trivalent chromium black chromium plating process.
9. Electrophoretic painting: the AKINI 120 electrophoresis process is adopted to prepare the electrophoresis paint layer 9 on the trivalent chromium black chromium plating layer
The electroplated parts prepared in the examples 1 and 2 are subjected to a neutral salt spray test 720h 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 embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, the specific implementation and the application range can be changed according to the embodiment of the present invention. In view of the above, the present disclosure should not be construed as limiting the utility model.
Claims (6)
1. The utility model provides a plating layer structure of aluminum alloy die casting trivalent chromium black chromium plating and application electrophoresis lacquer which characterized in that: the acid zinc-nickel alloy electroplating solution comprises an aluminum alloy substrate, and a chemical zinc deposition 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, a trivalent chromium black chromium plating layer and an electrophoretic paint coating which are sequentially prepared on the aluminum alloy substrate from inside to outside;
the thickness of the trivalent chromium black chromium coating is 0.1-0.4 mu m;
the electrophoretic paint coating is colorless and transparent, and the thickness of the coating is 5-12 mu m.
2. The aluminum alloy die casting plated with black trivalent chromium and with an electrophoretic paint according to claim 1, wherein: the thickness of the acid zinc-nickel alloy coating is 8-16 mu m.
3. The aluminum alloy die casting plated with black trivalent chromium and with an electrophoretic paint according to claim 1, wherein: the thickness of the chemical nickel-plating layer is 1-4 mu m.
4. The aluminum alloy die casting plated with black trivalent chromium and with an electrophoretic paint according to claim 1, wherein: the pyrophosphate copper plating layer is 6-12 mu m thick.
5. The aluminum alloy die casting plated with black trivalent chromium and with an electrophoretic paint according to claim 1, wherein: the thickness of the acid copper plating layer is 8-16 mu m.
6. The aluminum alloy die casting plated with black trivalent chromium and with an electrophoretic paint according to claim 1, wherein: the thickness of the bright nickel coating is 4-10 mu m.
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| CN114525558A (en) * | 2022-03-01 | 2022-05-24 | 九牧厨卫股份有限公司 | Antiviral environment-friendly composite coating, preparation method thereof and antiviral environment-friendly product |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114525558A (en) * | 2022-03-01 | 2022-05-24 | 九牧厨卫股份有限公司 | Antiviral environment-friendly composite coating, preparation method thereof and antiviral environment-friendly product |
| CN114525558B (en) * | 2022-03-01 | 2024-01-02 | 九牧厨卫股份有限公司 | Antiviral environment-friendly composite coating, preparation method thereof and antiviral environment-friendly product |
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