CN210176954U - Cadmium cobalt alloy plating layer structure of aluminum alloy part - Google Patents
Cadmium cobalt alloy plating layer structure of aluminum alloy part Download PDFInfo
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- CN210176954U CN210176954U CN201920908707.0U CN201920908707U CN210176954U CN 210176954 U CN210176954 U CN 210176954U CN 201920908707 U CN201920908707 U CN 201920908707U CN 210176954 U CN210176954 U CN 210176954U
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Abstract
The utility model discloses a cadmium cobalt alloy cladding material structure of aluminum alloy spare part, including metal substrate the last cadmium cobalt alloy cladding material of preparing of metal substrate, and form low chromium color passivation layer or the army green passivation layer on the cadmium cobalt alloy cladding material. The utility model has the advantages that: the cadmium-cobalt alloy plating layer has high compactness and excellent corrosion resistance, is suitable for preparing high corrosion resistance plating layers in various strong corrosion environments, and solves the problem of strong corrosion of warships and offshore petroleum equipment in China in the marine environment.
Description
Technical Field
The utility model relates to a metal plating field, concretely relates to cadmium cobalt alloy cladding material structure of aluminum alloy spare part.
Background
At present, parts of navigation equipment are generally prepared into a high-corrosion-resistance protective coating by adopting cadmium plating and zinc-plated nickel alloy processes, but the traditional protection technology cannot solve the problem of strong corrosion of tropical sea in the course of ship-off-sea navigation work in China. Therefore, research and development of new plating techniques and highly corrosion-resistant plating have been made.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a cadmium cobalt alloy cladding material structure of aluminum alloy spare part to solve the problem that current cladding material protection technology can not satisfy manufacturing technical demand in new period.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a cadmium-cobalt alloy coating structure of an aluminum alloy part comprises an aluminum alloy substrate, a zinc dipping layer prepared on the aluminum alloy substrate, a cadmium-cobalt alloy coating prepared on the zinc dipping layer, and a hexavalent chromium passivation layer formed on the cadmium-cobalt alloy coating;
the zinc dipping layer is prepared by adopting an acidic aluminum zinc-depositing agent and contains two components of zinc and nickel.
In some embodiments, the thickness of the cadmium cobalt alloy coating is 6-24 μm.
In some embodiments, the cadmium cobalt alloy plating layer is prepared by a potassium chloride cadmium cobalt alloy electroplating process developed by Guangzhou ultra-Pont chemical Co.
In some of the embodiments, the thickness of the hexavalent chromium passivation layer is 0.3 to 0.8 μm.
In some of these embodiments, the hexavalent chromium passivation layer is prepared using a chromate low chromium color passivation process.
In some of these embodiments, the hexavalent chromium passivation layer is prepared using a chromic acid army green passivation process.
The utility model has the advantages that:
1. the cadmium-cobalt alloy plating layer has high compactness and excellent corrosion resistance, and is suitable for preparing high corrosion resistance plating layers in various strong corrosion environments;
2. the acid aluminum zinc-plating agent of the utility model is adopted to prepare a zinc-dipping layer on an aluminum alloy matrix, the zinc-dipping layer contains two components of zinc and nickel, and a cadmium-cobalt alloy coating can be directly prepared on the zinc-dipping layer;
3. the process is simple, the electroplating cost is low, and the method has a good market prospect.
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 present invention will be described in detail with reference to the drawings and specific embodiments, and the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
Example 1:
as shown in fig. 1, the cadmium cobalt alloy plating layer structure of the aluminum alloy part comprises an aluminum alloy substrate 1, a zinc dipping layer 2 formed on the aluminum alloy substrate 1, a cadmium cobalt alloy plating layer 3 prepared on the zinc dipping layer 2, and a chromate low-chromium color passivation layer 4 formed on the cadmium cobalt alloy plating layer 3.
The zinc dipping layer 2 is prepared by adopting AZIN-113 acid aluminum zinc-depositing agent produced by ultra-high chemical industry:
AZIN-113 acid aluminum zinc deposition agent: 150-250 mL/L;
working temperature: 15-30 ℃;
the pH value of the zinc precipitation solution is as follows: 3.4 to 4.2;
and (3) zinc precipitation time: 20-80 s.
The thickness of the cadmium cobalt alloy plating layer 3 is 10-12 mu m, and the cadmium cobalt alloy plating layer is prepared by adopting a potassium chloride cadmium cobalt alloy electroplating process developed by the ultra-high chemical industry.
The components and the operating conditions of the potassium chloride cadmium cobalt alloy plating solution are as follows: 30g/L of cadmium chloride, 10g/L of cobalt chloride, 150g/L of NCC-617 coordination agent, 160g/L of potassium chloride, 2mL/L of NCC-617 brightening agent, 30mL/L of NCC-617 auxiliary agent, 10g/L of NCC-617 migration agent, 6.5-7.5 of pH, 20-35 ℃ of temperature and 0.8-1.5A/dm of cathode current density2The area ratio of the cathode to the anode is 2: 1-3, and the anodeIs a cadmium plate with the cadmium content more than or equal to 99.97 percent.
The chromate low-chromium color passivation layer 4 is prepared by adopting an HC high-protection color passivator in the ultra-high-protection chemical industry:
HC high protection color passivator: the volume fraction is 2-4%;
working temperature: 20-35 ℃;
dipping time: 5-30 s;
pH of the passivation solution: 1.3 to 2.0;
stirring: stirring the passivation solution or swinging the workpiece;
thickness of the passivation layer: 0.3 to 0.6 μm.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the aluminum alloy part 1 is subjected to the steps of "chemical degreasing → water washing → etching → water washing → light extraction → water washing".
2. Zinc dipping: the pretreated aluminum alloy part 1 is subjected to the process of "first zincing → water washing → zinc annealing → water washing → second zincing → water washing" to obtain the zinced layer 2.
3. Electroplating cadmium cobalt alloy: after the aluminum alloy part 1 is soaked with zinc, cadmium cobalt alloy is electroplated → water washing is carried out to prepare a cadmium cobalt alloy plating layer 3.
4. Passivation: the cadmium cobalt alloy plating layer 3 is subjected to the working procedures of nitric acid light extraction with the volume fraction of 1 percent → water washing → low chromium chromate color passivation → water washing → drying at 70-80 ℃ to obtain the low chromium chromate color passivation layer 4.
Example 2:
as shown in fig. 1, the cadmium cobalt alloy plating layer structure of the aluminum alloy part comprises an aluminum alloy substrate 1, a zinc dipping layer 2 formed on the aluminum alloy substrate 1, a cadmium cobalt alloy plating layer 3 plated on the zinc dipping layer 2, and a army green passivation layer 4 formed on the cadmium cobalt alloy plating layer 3.
The zinc dipping layer 2 is prepared by adopting AZIN-113 acid aluminum zinc-depositing agent produced by ultra-high chemical industry:
AZIN-113 acid aluminum zinc deposition agent: 150-250 mL/L;
working temperature: 15-30 ℃;
the pH value of the zinc precipitation solution is as follows: 3.4 to 4.2;
and (3) zinc precipitation time: 20-80 s.
The thickness of the cadmium cobalt alloy plating layer 3 is 9-11 mu m, and the cadmium cobalt alloy plating layer is prepared by adopting a potassium chloride cadmium cobalt alloy electroplating process.
The components and the operating conditions of the potassium chloride cadmium cobalt alloy plating solution are as follows: 25g/L of cadmium chloride, 15g/L of cobalt chloride, 160g/L of NCC-617 coordination agent, 180g/L of potassium chloride, 2mL/L of NCC-617 brightening agent, 30mL/L of NCC-617 auxiliary agent, 10g/L of NCC-617 migration agent, 6.5-7.5 of pH, 20-35 ℃ of temperature and 0.8-1.5A/dm of cathode current density2The area ratio of the cathode to the anode is 2: 1-3, and the anode is a cadmium plate with the cadmium content being more than or equal to 99.97%.
The army green passivation layer 4 is prepared from OVG-31 high-corrosion-resistance army green passivator in ultra-high-level chemical industry:
OVG-31 army green passivator: 80-120 mL/L;
pH of the passivation solution: 1.0 to 1.6;
passivation temperature: 20-30 DEG C
Stirring: stirring or swinging the plated part by air;
immersion time: 30-90 s;
thickness of the passivation layer: 0.5 to 0.7 μm.
The operation of the embodiment is divided into the following steps:
1. pretreatment: the aluminum alloy part 1 is subjected to the steps of "chemical degreasing → water washing → etching → water washing → light extraction → water washing".
2. Zinc dipping: the pretreated aluminum alloy part 1 is subjected to the process of "first zincing → water washing → zinc annealing → water washing → second zincing → water washing" to obtain the zinced layer 2.
3. Electroplating cadmium cobalt alloy: after the aluminum alloy part 1 is soaked with zinc, cadmium cobalt alloy is electroplated → water washing is carried out to prepare a cadmium cobalt alloy plating layer 3.
4. Passivation: the cadmium-cobalt alloy plating layer 3 is subjected to' nitric acid light extraction with volume fraction of 1% → water washing → army green passivation → water washing → drying at 70-80 ℃ to obtain an army green passivation layer 4.
The electroplated part prepared in example 1 is subjected to a neutral salt spray test for 4000h according to GB/T10125-.
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, placing the plated part into water at room temperature, and cooling the plated part suddenly, wherein the plated layer does not foam or fall off, and the cadmium plating 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 (6)
1. The cadmium cobalt alloy plating layer structure of the aluminum alloy part is characterized in that:
the cadmium-cobalt alloy passivation layer is formed on the cadmium-cobalt alloy plating layer;
the zinc dipping layer is prepared by adopting an acidic aluminum zinc-depositing agent and contains two components of zinc and nickel.
2. The cadmium cobalt alloy plating structure of aluminum alloy parts according to claim 1, characterized in that:
the thickness of the cadmium-cobalt alloy plating layer is 6-24 mu m.
3. The cadmium cobalt alloy plating structure of aluminum alloy parts according to claim 1 or 2, characterized in that:
the cadmium cobalt alloy plating layer is prepared by adopting a potassium chloride cadmium cobalt alloy electroplating process developed by Guangzhou ultra-Pont chemical industry Co.
4. The cadmium cobalt alloy plating structure of aluminum alloy parts according to claim 1, characterized in that:
the thickness of the hexavalent chromium passivation layer is 0.3-0.8 mu m.
5. The cadmium cobalt alloy plating structure of aluminum alloy parts according to claim 1 or 4, characterized in that:
the hexavalent chromium passivation layer is prepared by adopting a chromate low-chromium color passivation process.
6. The cadmium cobalt alloy plating structure of aluminum alloy parts according to claim 1 or 4, characterized in that:
the hexavalent chromium passivation layer is prepared by adopting a chromic acid army green passivation process.
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