CN216074060U - Coating structure for zinc alloy die casting plated with pearl nickel and electrophoretic painting - Google Patents
Coating structure for zinc alloy die casting plated with pearl nickel and electrophoretic painting Download PDFInfo
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- CN216074060U CN216074060U CN202122687110.8U CN202122687110U CN216074060U CN 216074060 U CN216074060 U CN 216074060U CN 202122687110 U CN202122687110 U CN 202122687110U CN 216074060 U CN216074060 U CN 216074060U
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Abstract
The utility model discloses a coating structure for pearl nickel plating and electrophoretic painting of a zinc alloy die casting, which comprises a zinc alloy matrix, and a zinc-nickel alloy coating, an HEDP pre-copper plating layer, a bright copper plating layer, a pearl nickel coating and an electrophoretic paint coating which are sequentially prepared on the zinc alloy matrix from inside to outside. The coating structure for plating the pearl nickel and the electrophoretic painting on the zinc alloy die casting disclosed by the utility model has the advantages that the preparation process is environment-friendly, the neutral salt spray test is carried out for 720 hours according to GB/T10125-2012 salt spray test for artificial atmosphere corrosion test, no corrosive substances are generated on the surface of the plated part, and the plated part has good corrosion resistance.
Description
Technical Field
The utility model belongs to the field of metal electroplating, and particularly relates to a coating structure for pearl nickel plating and electrophoretic painting of a zinc alloy die casting.
Background
The pearl nickel plating layer is silvery white, has soft and beautiful appearance, and is widely applied to the electroplating of hardware products. However, the pearl nickel layer is not highly corrosion resistant and easily darkens in color in natural environment, and thus is not suitable for plating of high-end ornaments.
The traditional technology for plating the zinc alloy die casting with the pearl nickel uses cyanide copper plating as a pre-plating layer, and then pyrophosphate copper plating, bright nickel plating and pearl nickel plating are carried out. Since cyanide is a highly toxic compound and is strictly prohibited by governments, the use of cyanide copper plating processes is increasingly restricted.
Under the background that cyanide is prohibited, how to adopt environment-friendly electroplating technology to replace cyanide copper plating is an urgent problem to be solved in the industry.
SUMMERY OF THE UTILITY MODEL
The utility model provides a coating structure for plating pearl nickel and electrophoretic painting on a zinc alloy die casting, aiming at solving the problems that a cyanide pre-copper plating process with high toxicity is adopted for plating the pearl nickel on the zinc alloy die casting and the corrosion resistance of a pearl nickel coating is not high. In order to achieve the purpose, the utility model adopts the following technical scheme:
a plating layer structure for plating pearl nickel and electrophoretic painting on a zinc alloy die casting comprises a zinc alloy matrix, and a zinc-nickel alloy plating layer, an HEDP copper plating layer, a bright copper plating layer, a pearl nickel plating layer and a colorless electrophoretic paint coating which are sequentially prepared on the zinc alloy matrix from inside to outside.
In some embodiments, the thickness of the zinc-nickel alloy coating is 8-16 μm.
In some embodiments, the HEDP copper plating layer has a thickness of 6-12 μm.
In some embodiments, the bright copper plating layer has a thickness of 10 to 20 μm.
In some embodiments, the thickness of the pearl nickel coating is 3-6 μm.
In some of these embodiments, the thickness of the colorless electrophoretic paint coating is 6-12 μm.
The zinc-nickel alloy plating solution has higher dispersing capacity and deep plating capacity, the plating layer has higher corrosion resistance, and the zinc-nickel alloy plating on the zinc alloy die casting can effectively seal holes and improve the corrosion resistance. The HEDP complexing agent has strong complexing ability to copper ions, and HEDP copper complexing ions can not replace zinc on the zinc-nickel alloy coating in a short time, so HEDP copper plating and then acid copper plating and other coatings can be carried out on the zinc-nickel alloy coating, and the binding force between the coatings is good. Therefore, zinc-nickel alloy plating and HEDP copper plating on the zinc alloy die casting can replace cyanide copper plating with high toxicity.
The pearl nickel plating layer is prepared by adopting the traditional process, bright nickel and pearl nickel are needed to be plated on the bright copper plating layer in order to increase the corrosion resistance and the wear resistance of the plating layer, and the pearl nickel plating layer is directly plated on the bright copper plating layer and then coated with the electrophoretic paint, so that the corrosion resistance and the wear resistance of the pearl nickel plating layer are higher than those of the pearl nickel plating layer prepared by adopting the traditional process.
Compared with the prior art, the utility model has the following beneficial effects:
1. the plating layer structure for plating the pearl nickel and the electrophoretic painting on the zinc alloy die casting, disclosed by the utility model, adopts the zinc-nickel alloy electroplating and the HEDP copper plating to replace cyanide copper plating, so that the limitation of using highly toxic cyanide and the potential safety hazard caused by using the highly toxic cyanide in the prior art are eliminated;
2. the colorless transparent electrophoretic paint is coated on the pearl nickel plating layer, so that the soft and beautiful appearance of the pearl nickel can be kept, and the corrosion resistance and the tarnish resistance of the plating layer can be obviously improved;
3. the coating structure omits a bright nickel coating in the traditional pearl nickel coating structure, and obviously reduces the electroplating cost.
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.
A plating layer structure for plating pearl nickel and electrophoretic painting on a zinc alloy die casting comprises a zinc alloy matrix, and a zinc-nickel alloy plating layer, an HEDP copper plating layer, a bright copper plating layer, a pearl nickel plating layer and a colorless electrophoretic paint coating which are sequentially prepared on the zinc alloy matrix from inside to outside.
The zinc alloy die casting is subjected to wax removal, oil removal, polishing and activation by adopting the conventional pretreatment process.
Preferably, a ZDP-92 zinc alloy die casting chemical polishing agent of ultra-Pont chemical Co is adopted in the polishing process, and the polishing process comprises the following steps: 400-650 mL/L of ZDP-92 polishing agent, 2-3 mL/L of wetting agent, 60-75 ℃ and 10-60 s of time.
The zinc-nickel alloy is plated after the workpiece is pretreated, and the thickness of a plating layer is 8-16 mu m.
Preferably, the zinc-nickel alloy coating is prepared by adopting a Detronzin1215 alkaline zinc-nickel alloy electroplating process in the ultra-high chemical industry, and the mass fraction of nickel in the coating is 10-15%.
The process conditions of Detronzin1215 alkaline zinc-nickel alloy are as follows: 5.5-8.5 g/L Zn, 1.0-1.8 g/L Ni (provided by 13-22 mL/L DETRONZIN1215 Ni replenisher), 120-135 g/L NaOH, 90-110 mL/L DETRONZIN1215 Base adjuvant, 1.0-5.0 mL/L DETRONIN 1215Brightener main polish, 0.1-0.8 mL/L DETRONZIN1215Purifier R decontaminant, 21-28 deg.C bath temperature, and 1.0-3.0A/dm of cathode current density2The cathode is moved 4-6 m/min.
Preferably, the zinc-nickel alloy coating is prepared by adopting a DETRONZIN1377 acidic zinc-nickel alloy electroplating process in the ultra-bonding chemical industry, and the mass fraction of nickel in the coating is 10-15%.
The DETRONZIN1377 acid zinc-nickel alloyThe conditions are as follows: 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 DETRONZIN1377B Bri main light agent, 10-20 mL/L of DETRONZIN 1377C Complex complexing agent, 8-12 mL/L of DETRONZIN1377D 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.
After plating zinc-nickel alloy on a workpiece, removing a film by using sulfuric acid with the mass fraction of 5%, and then preparing an HEDP copper plating layer, wherein the thickness of the prepared plating layer is 6-12 mu m.
Preferably, the HEDP copper plating process comprises the following steps:
35-45 g/L of copper sulfate, 80-130 g/L of HEDP complexing agent, 40-60 g/L of potassium carbonate, 20-25 mL/L of CuR-1 additive, pH range of 9-10, plating bath temperature of 35-50 ℃, and cathode current density of 1-3A/dm2The cathode is moved for 2-4 m/min.
And plating bright copper on the workpiece after the HEDP is plated with copper, wherein the thickness of a bright copper plating layer is 10-20 mu m, and the bright copper plating layer is prepared by adopting the existing acid copper plating process.
The pearl nickel plating layer is 3-6 mu m thick and is prepared by adopting the existing pearl nickel plating process.
After the plated piece is plated with pearl nickel, electrophoretic paint is coated, and the thickness of the coating is 6-12 mu m.
Preferably, the electrophoretic paint coating is prepared by adopting an AKINI120 electrophoresis process of ultra-high chemical engineering: 300-350 g/L of AKINI120 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 pearl nickel plating and electrophoretic painting of the zinc alloy die casting comprises a zinc alloy substrate 1, and a zinc-nickel alloy coating layer 2, an HEDP copper coating layer 3, a bright copper coating layer 4, a pearl nickel coating layer 5 and a colorless electrophoretic paint coating layer 6 which are sequentially prepared on the zinc alloy substrate 1 from inside to outside.
The thickness of the zinc-nickel alloy coating 2 is 10-12 mu m, the coating is prepared by adopting a Detron zin1215 alkaline zinc-nickel alloy electroplating process of the ultra-nation chemical industry, and the mass fraction of nickel in the coating is 12.5%.
The process conditions of Detronzin1215 alkaline zinc-nickel alloy are as follows: 7g/L zinc, 1.4g/L nickel (provided by 16mL/L DetroNZIN1215 Ni Nickel replenisher), 128g/L sodium hydroxide, 100mL/L DetroNZIN1215 Base adjuvant, 3mL/L DetroNZIN1215 Brightener major Purifier, 0.4mL/L DetroNZIN1215Purifier R Purifier, bath temperature 25 deg.C, and cathode current density 2.0A/dm2The cathode was moved 5 m/min.
The thickness of the HEDP copper plating layer 3 is 7-9 mu m, and the preparation method adopts an HEDP copper plating process:
38g/L of copper sulfate, 100g/L of HEDP complexing agent, 45g/L of potassium carbonate, 20mL/L of CuR-1 additive, pH of 9.5, plating bath temperature of 45 ℃, and cathode current density of 2A/dm2The cathode was moved 3.5 m/min.
The thickness of the bright copper plating layer 4 is 15-17 mu m, and the bright copper plating layer is prepared by adopting the existing acid copper plating process.
The thickness of the pearl nickel plating layer 5 is 3-5 mu m, and the pearl nickel plating layer is prepared by adopting the existing pearl nickel plating process.
The thickness of the electrophoretic paint coating is 8-10 mu m, and the electrophoretic paint coating is prepared by adopting an AKINI120 electrophoresis process in ultra-high-level chemical industry: 320g/L of AKINI120 electrophoretic paint, the pH value of the electrophoretic bath solution is 4.3, the operation temperature is 26 ℃, the bath voltage is 35V, the electrophoresis time is 25s, and the product is dried for 30min at 140 ℃ after being washed by water.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the zinc alloy workpiece 1 is subjected to the steps of "chemical wax removal → water washing → ultrasonic wax removal → water washing → chemical degreasing → water washing → light extraction → water washing → acid salt activation → water washing".
2. Electroplating alkaline zinc-nickel alloy: preparing a zinc-nickel alloy coating 2 on the pretreated zinc alloy workpiece 1.
3. And (3) HEDP copper plating: an HEDP copper plating layer 3 is prepared on the zinc-nickel alloy plating layer 2.
4. Bright copper plating: a bright copper plating layer 4 is prepared on the HEDP copper plating layer 3.
6. Plating pearl nickel: and preparing a pearl nickel plating layer 5 on the bright copper plating layer 4.
7. Electrophoresis: preparing a colorless electrophoretic paint coating 6 on the pearl nickel plating layer 5, and drying after washing.
Example 2:
as shown in figure 1, the coating structure for pearl nickel plating and electrophoretic painting of the zinc alloy die casting comprises a zinc alloy substrate 1, and a zinc-nickel alloy coating layer 2, an HEDP copper coating layer 3, a bright copper coating layer 4, a pearl nickel coating layer 5 and a colorless electrophoretic paint coating layer 6 which are sequentially prepared on the zinc alloy substrate 1 from inside to outside.
The thickness of the zinc-nickel alloy coating 2 is 12-14 mu m, the zinc-nickel alloy coating is prepared by adopting a DETRONZIN1377 acidic zinc-nickel alloy electroplating process in the ultra-bonding chemical industry, and the mass fraction of nickel in the coating is 12.5%.
The DETRONZIN1377 acidic zinc-nickel alloy conditions are as follows: 26g/L of zinc, 26g/L of nickel, 180g/L of potassium chloride, 60g/L of ammonium chloride, 15mL/L of DETRONZIN 1377A Base auxiliary agent, 1mL/L of DETRONZIN1377B Bri main light agent, 15mL/L of DETRONZIN 1377C Complex complexing agent, 10mL/L of DETRONZIN1377D Additive, the temperature of a plating bath is 30 ℃, the pH value is 5, and the cathode current density is 2A/dm2The cathode was moved 4 m/min.
The thickness of the HEDP copper plating layer 3 is 9-11 mu m, and the preparation method adopts an HEDP copper plating process:
42g/L of copper sulfate, 110g/L of HEDP complexing agent, 55g/L of potassium carbonate, CuR-1 additive of 23mL/L, pH of 9.5, plating bath temperature of 40 ℃, and cathode current density of 2A/dm2The cathode was moved 2.8 m/min.
The thickness of the bright copper plating layer 4 is 13-15 mu m, and the bright copper plating layer is prepared by adopting the existing acid copper plating process.
The thickness of the pearl nickel plating layer 5 is 4-6 mu m, and the pearl nickel plating layer is prepared by adopting the existing pearl nickel plating process.
The thickness of the electrophoretic paint coating is 8-10 mu m, and the electrophoretic paint coating is prepared by adopting an AKINI120 electrophoresis process in ultra-high-level chemical industry: 340g/L of AKINI120 electrophoretic paint, the pH value of the electrophoretic bath solution is 4.5, the operation temperature is 26 ℃, the bath voltage is 30V, the electrophoresis time is 30s, 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 zinc alloy workpiece 1 is subjected to the steps of "chemical wax removal → water washing → ultrasonic wax removal → water washing → chemical degreasing → water washing → light extraction → water washing → acid salt activation → water washing".
2. Electroplating alkaline zinc-nickel alloy: preparing a zinc-nickel alloy coating 2 on the pretreated zinc alloy workpiece 1.
3. And (3) HEDP copper plating: an HEDP copper plating layer 3 is prepared on the zinc-nickel alloy plating layer 2.
4. Bright copper plating: a bright copper plating layer 4 is prepared on the HEDP copper plating layer 3.
6. Plating pearl nickel: and preparing a pearl nickel plating layer 5 on the bright copper plating layer 4.
7. Electrophoresis: preparing a colorless electrophoretic paint coating 6 on the pearl nickel plating layer 5, and drying after washing.
Test example 1:
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 in a heating furnace to 190 ℃, taking out the plated part after 30min, placing the plated part in water at room temperature, and cooling the plated part suddenly, wherein the plated layer does not generate bubbles or fall off, and the plated layer has good bonding force.
Test example 2:
the electroplated parts prepared in the embodiments 1 and 2 are subjected to a neutral salt spray test for 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 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, 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 present description should not be construed as a limitation to the present invention.
Claims (6)
1. The utility model provides a zinc alloy die casting plates pearl nickel and electrophoresis japanning's cladding material structure which characterized in that: the zinc-nickel alloy coating comprises a zinc alloy matrix, and a zinc-nickel alloy coating layer, an HEDP copper coating layer, a bright copper coating layer, a pearl nickel coating layer and a colorless electrophoretic paint coating layer which are sequentially prepared on the zinc alloy matrix from inside to outside.
2. The coating structure of zinc alloy die casting pearl nickel and electrodeposition coating according to claim 1, wherein: the thickness of the zinc-nickel alloy coating is 8-16 mu m.
3. The coating structure for pearl nickel plating and electrophoretic painting of a zinc alloy die casting as claimed in claim 1, wherein: the thickness of the HEDP copper-plated layer is 6-12 mu m.
4. The coating structure for pearl nickel plating and electrophoretic painting of a zinc alloy die casting as claimed in claim 1, wherein: the thickness of the bright copper plating layer is 10-20 mu m.
5. The coating structure for pearl nickel plating and electrophoretic painting of a zinc alloy die casting as claimed in claim 1, wherein: the thickness of the pearl nickel coating is 3-6 mu m.
6. The coating structure for pearl nickel plating and electrophoretic painting of a zinc alloy die casting as claimed in claim 1, wherein: the thickness of the colorless electrophoretic paint coating is 6-12 mu m.
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