CN211546693U

CN211546693U - Aluminum alloy anodic oxidation and graphene sealing protective layer

Info

Publication number: CN211546693U
Application number: CN201922316804.3U
Authority: CN
Inventors: 郭崇武; 李小花; 陈康; 赖奂汶
Original assignee: Guangzhou Ultra Union Chemicals Ltd
Current assignee: Guangzhou Ultra Union Chemicals Ltd
Priority date: 2019-12-21
Filing date: 2019-12-21
Publication date: 2020-09-22
Anticipated expiration: 2029-12-21

Abstract

The utility model discloses an aluminium alloy anodic oxidation seals inoxidizing coating with graphite alkene, include anodic oxidation layer and the graphite alkene sealing layer of preparing from inside to outside on aluminium alloy matrix surface, anodic oxidation layer adopts nanometer hydroxyl graphite alkene hole sealing agent hole sealing. The utility model provides an aluminum alloy inoxidizing coating carries out neutral salt fog test 1200h according to GB/T10125 and 1997 "artificial atmosphere corrosion test salt fog test", plates a surface and does not have white corrosive substance and generate.

Description

Aluminum alloy anodic oxidation and graphene sealing protective layer

Technical Field

The utility model belongs to the technical field of metal surface treatment, concretely relates to aluminum alloy anodic oxidation seals inoxidizing coating with graphite alkene.

Background

The aluminum alloy anodizing process is widely applied to the fields of aviation, electric appliances, electronic industry, various mechanical manufacturing and light industry, and aluminum alloy parts such as doors, windows, frames, laths and the like are also widely treated by anodizing the aluminum alloy in the building industry.

The porosity of the aluminum alloy anode oxide layer is 10-15% on average, and the anode oxide layer is required to be subjected to hole sealing treatment in order to improve the corrosion resistance. In the prior art, a nickel salt sealing hole is generally adopted to treat an aluminum alloy anode oxide layer. With the increasing awareness of environmental protection, some countries and regions have also started to limit the sealing process of nickel salt.

With the development of manufacturing industry, the existing aluminum alloy anodic oxidation process cannot meet the increasing technical requirements in the industry, and the work of developing new technology to improve the corrosion resistance of aluminum alloy is imperative.

Disclosure of Invention

In order to overcome aluminum alloy anodic oxidation prior art and adopt the technical defect of nickel salt hole sealing and solve the problem that aluminum alloy anodic oxidation layer corrosion resistance is high inadequately, the utility model provides an aluminum alloy anodic oxidation seals the inoxidizing coating with graphite alkene. In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides an aluminum alloy anodic oxidation and graphite alkene seals inoxidizing coating, includes the aluminum alloy base member anodic oxidation layer and the graphite alkene sealing layer that prepare in proper order from inside to outside on the aluminum alloy base member, it is right anodic oxidation layer adopts nanometer hydroxyl graphite alkene hole sealing agent hole sealing.

In some embodiments, the graphene capping reagent is a hydroxyl graphene modified capping reagent.

In some embodiments, the graphene sealing layer has a thickness of 0.3-1.5 μm.

In some of these embodiments, the anodized layer is prepared using a sulfuric acid anodizing process.

In some of these embodiments, the anodized layer is prepared using an oxalic acid anodization process.

In some of the embodiments, the thickness of the anode maintaining layer is 5-25 μm.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model adopts the nano-hydroxyl graphene hole sealing agent to replace the traditional nickel salt hole sealing agent, the nano-hydroxyl graphene is filled into the gap of the anodic oxide layer to seal the gap, the sealing effect is superior to the sealing effect of nickel salt, and the technical defect of harm to human skin caused by the existing nickel salt sealing is overcome;

2. hydroxyl on the surface of the nano-hydroxyl graphene can react with an aluminum alloy matrix to generate a graphene hydroxyl aluminum compound, so that the graphene hydroxyl aluminum compound has a stronger passivation effect on the aluminum alloy matrix and the corrosion resistance of the aluminum alloy is further improved;

3. the utility model discloses a modified sealant of hydroxyl graphite alkene seals the processing to the aluminum alloy spare through anodic oxidation and hole sealing processing, the seal has higher corrosion resistance, wearability, electric conductivity and from the closure, can show the surface property who improves the aluminum alloy spare.

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 structural view of an aluminum alloy protective layer according to

embodiments

1 and 2 of the present invention.

Detailed Description

For the convenience of understanding the present invention, the present invention will be described more fully with reference to the following embodiments, which are provided for preferred embodiments of the present invention. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example 1:

as shown in fig. 1, the aluminum alloy anodic oxidation and graphene sealing protective layer comprises an anodic oxidation layer 2 and a graphene sealing layer 3 which are sequentially prepared from inside to outside on the surface of an aluminum alloy matrix 1, wherein the anodic oxidation layer is sealed by a nano-hydroxyl graphene sealant.

1. The anodic oxidation layer 2 is prepared by adopting a traditional sulfuric acid anodic oxidation process.

2. And the anodic oxide layer 2 is sealed by adopting a nano-hydroxyl graphene sealant.

The preparation method of the hydroxyl graphene hole sealing agent comprises the following steps:

(1) low-temperature oxidation: adding 115mL of concentrated sulfuric acid into a 1000mL beaker, reducing the temperature of the concentrated sulfuric acid by 2-5 ℃ in an ice water bath, adding 5g of 300-mesh flake graphite powder with the mass fraction of more than 99%, slowly adding 18g of potassium permanganate while stirring, controlling the reaction temperature within the range of 2-10 ℃, and reacting for 120min while stirring;

(2) medium-temperature oxidation: changing the ice water bath into a warm water bath, controlling the reaction temperature between 30 and 40 ℃, and reacting for 90min under stirring;

(3) high-temperature oxidation: after the medium temperature reaction, taking the beaker out of the water bath, heating the paste in the beaker to 90 ℃, slowly adding 100mL of water, controlling the reaction temperature to be 90-100 ℃, stirring for 30min, slowly adding 15mL of 30% hydrogen peroxide into the beaker, and continuing the reaction for 30 min;

(4) removing acid and salt in the reaction product by using an electrodialysis method, adding a 20% sodium hydroxide solution to adjust the pH value to 9-11 to convert the sulfate-based graphene into the hydroxyl graphene, removing excessive sodium hydroxide by using an electrodialysis method to adjust the pH value of the hydroxyl graphene paste to 8-9, and adding deionized water to adjust the mass concentration of the nano hydroxyl graphene to 0.3-1.5 g/L.

3. The graphene sealing layer 3 is prepared by PRODICO 460 hydroxyl graphene modified sealing agent in the ultra-high chemical industry.

The preparation method of the PRODICO 460 hydroxyl graphene modified sealant comprises the following steps: 30 parts of commercially available product silica sol, 25 parts of water-soluble silane polymer with the product model of PU 113, 4 parts of nano hydroxyl graphene solution with the mass fraction of 4%, 0.5 part of TANAFAMS organic silicon defoamer, 0.5 part of LA13-863 organic silicon flatting agent and 40 parts of deionized water, and the components are mixed together and stirred uniformly.

Adding water to dilute the PRODICO 460 hydroxyl graphene modified sealing agent to 3 times to prepare graphene sealing liquid.

And (3) dipping the aluminum alloy piece subjected to anodic oxidation and hole sealing treatment in the graphene sealing liquid, taking out and drying to form a sealing layer.

The operation of the embodiment is divided into the following steps:

1. pretreatment: performing the steps of "alkaline chemical degreasing → washing → acid washing → washing" on the aluminum alloy substrate 1;

2. anodic oxidation layer 2: after pretreatment of the aluminum alloy matrix 1, preparing an anodic oxide layer 2 by sulfuric acid anodic oxidation → water washing → graphene hole sealing;

3. graphene sealing layer 3: after anodic oxidation and hole sealing of the aluminum alloy matrix, preparing a graphene sealing layer 3 by soaking graphene sealing liquid → dripping water → blowing off the sealing liquid remained at the bottom of the workpiece by high-pressure air → drying and curing at 70-100 ℃.

Example 2:

1. The anodic oxidation layer 2 is prepared by adopting a traditional oxalic acid anodic oxidation process.

2. And the polar oxide layer 2 is sealed by adopting a nano-hydroxyl graphene sealant.

The preparation method of the hydroxy graphene sealant is the same as that of the embodiment 1.

3. The graphene sealing layer 3 is prepared by using PRODICO 460 hydroxy graphene modified sealing agent:

the preparation method of the PRODICO 460 hydroxyl graphene modified sealant is the same as that of the example 1.

The operation of the embodiment is divided into the following steps:

2. anodic oxidation layer 2: after pretreatment of the aluminum alloy matrix 1, preparing an anodic oxide layer 2 by oxalic acid anodic oxidation → water washing → graphene hole sealing;

By using the protective layers of the aluminum alloy parts prepared in the

embodiments

1 and 2, a neutral salt spray test 1200h is carried out according to GB/T10125-.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides an aluminum alloy anodic oxidation and graphite alkene seal the inoxidizing coating which characterized in that: the hole sealing device comprises an aluminum alloy matrix, and an anodic oxidation layer and a graphene sealing layer which are sequentially prepared from inside to outside on the aluminum alloy matrix, wherein the anodic oxidation layer is sealed by a nano-hydroxyl graphene sealant.

2. The aluminum alloy anodized and graphene closed protective layer of claim 1, wherein: the graphene sealing layer is prepared by adopting a hydroxyl graphene modified sealing agent.

3. The aluminum alloy anodized and graphene closed protective layer of claim 1, wherein: the thickness of the graphene sealing layer is 0.3-1.5 mu m.

4. The aluminum alloy anodized and graphene closed protective layer of claim 1, wherein: the anodic oxidation layer is prepared by adopting a sulfuric acid anodic oxidation process or an oxalic acid anodic oxidation process.

5. The aluminum alloy anodized and graphene closed protective layer of claim 1 or 4, wherein: the thickness of the anodic oxidation layer is 5-25 μm.