CN108642350B - Corrosion-resistant aluminum alloy profile and surface treatment method thereof - Google Patents
Corrosion-resistant aluminum alloy profile and surface treatment method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
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Abstract
The invention discloses a corrosion-resistant aluminum alloy section and a surface treatment method thereof, wherein the corrosion-resistant aluminum alloy section is prepared from the following raw materials in parts by weight, Zn: 5.1-5.6 parts of Cu: 1.4-1.8 parts of Mg: 1.8-2.6 parts of Mn: 0.28-0.42 parts of Si: 0.5-1.5 parts of Fe: 0.7-1 part of Zr: 0.08 to 0.12 part, and the balance of Al and inevitable impurities. The surface treatment method comprises oil removal treatment, acid electrolysis, alkali electrolysis, anodic oxidation and alloy coating spraying. The invention has the characteristics of improving the corrosion resistance and the pollution resistance of the aluminum alloy section.
Description
Technical Field
The invention relates to a corrosion-resistant aluminum alloy section, in particular to a corrosion-resistant aluminum alloy section and a surface treatment method thereof.
Background
Because the aluminum alloy is added with high-content magnesium and silicon elements, the casting performance of the aluminum alloy can be improved, the hardness and the strength of the aluminum alloy are increased, and the corrosion resistance of the aluminum alloy is also reduced. For building aluminum profiles and other industrial aluminum profiles, surface treatment is an indispensable technological process for further improving the surface hardness, corrosion resistance and aesthetic degree of the aluminum profiles. The surface treatment processes of aluminum and its alloys commonly used in industry are anodization, electrolytic coloring and electrophoretic coating, with anodization being the most common. The anodic oxidation of aluminum and its alloy simultaneously comprises two processes of dissolving metal aluminum from the surface and generating aluminum oxide on the surface, and the final result is to generate a layer of micron-sized aluminum oxide film on the surface of the material, which plays a role in improving the hardness and corrosion resistance. Aluminum alloy containing magnesium and silicon is subjected to anodic oxidation treatment, after surface metal aluminum is dissolved, elemental silicon which is not oxidized is exposed, the generated aluminum oxide film is not easy to cover the elemental silicon, and gaps caused by silicon particles are easy to corrode. In the existing surface treatment process for magnesium-containing and silicon-aluminum alloy, the generated anodic oxide film has a large number of microporous structure units, the uniformity is poor, the density of the oxide film is not high enough, and the oxide film is easily corroded and damaged by erosive ions; the micropores also tend to adsorb environmental contaminants, which affect the appearance of the membrane, and their corrosion resistance and contamination resistance are not ideal and need to be improved. Therefore, the prior process for carrying out surface treatment on the magnesium-containing and silicon-aluminum alloy has the problem that the corrosion resistance and the pollution resistance of the treated aluminum alloy section are not ideal.
Disclosure of Invention
The invention aims to provide a corrosion-resistant aluminum alloy profile and a surface treatment method thereof. The invention has the characteristics of improving the corrosion resistance and the pollution resistance of the aluminum alloy section.
The technical scheme of the invention is as follows: the corrosion-resistant aluminum alloy section is prepared from the following raw materials in parts by weight: 5.1-5.6 parts of Cu: 1.4-1.8 parts of Mg: 1.8-2.6 parts of Mn: 0.28-0.42 parts of Si: 0.5-1.5 parts of Fe: 0.7-1 part of Zr: 0.08 to 0.12 part, and the balance of Al and inevitable impurities.
The surface treatment method of the corrosion-resistant aluminum alloy section comprises the following steps:
a. placing the aluminum alloy in a degreasing tank, adding a degreasing agent, degreasing at 70-90 ℃, rinsing with water at 60-70 ℃, and cleaning with normal-temperature water in a flowing manner to obtain a product a;
b. putting the product a into an electrolytic tank, adding acid electrolyte into the electrolytic tank, electrifying, and controlling the current density at 40-60 ℃ to be 6-12A/dm2Performing electrolysis for 3-5min to obtain product b;
c. putting the product b into the electrolytic tank again, adding an alkaline electrolyte into the electrolytic tank, electrifying, and controlling the current density at 50-80 ℃ to be 6-12A/dm2Electrolyzing for 3-5min to obtain product c;
d. placing the product c in an oxidation tank, adding 1 part of sulfuric acid, 4 parts of deionized water and 0.2 part of oxalic acid for anodic oxidation at the temperature of 12-25 ℃ and the current density of 1-2A/dm2At voltage of 13-23V for 30-40min, taking out, treating in boiling water for 30-50min, taking out, and oven drying to obtain product d;
e. and d, placing the product d in a nitrogen protective atmosphere, and spraying by using an alloy coating, wherein the alloy coating is prepared from the following raw materials in parts by weight: 50-60 parts of zinc powder, 10-20 parts of nickel powder and 5-10 parts of silicon carbide powder, mixing and grinding the materials to prepare a coating, and spraying the coating on the surface of the product d to obtain the aluminum alloy section.
In the surface treatment method, the degreasing agent comprises 60-80g/l of sodium hydroxide, 30-50g/l of trisodium phosphate and 6-8g/l of surfactant.
In the surface treatment method, in the step b, the acid electrolyte comprises the following raw materials in parts by weight: 1 part of ferrous sulfate, 1 part of copper sulfate and 0.5 part of hydrochloric acid.
In the surface treatment method, the alkaline electrolyte comprises the following raw materials in parts by weight: 1 part of sodium hydroxide, 1 part of copper sulfate and 0.2 part of ferric chloride.
In the surface treatment method, the step e is to spray the product d in a nitrogen protective atmosphere by using an alloy coating, wherein the alloy coating is prepared from the following raw materials in parts by weight: 50-60 parts of zinc powder, 10-20 parts of nickel powder and 5-10 parts of silicon carbide powder, mixing and grinding the materials to prepare a coating, spraying the coating on the surface of the product d with the spraying thickness of 0.4-0.6mm, then placing the product into a high-temperature furnace at 200-400 ℃ to heat for 30-60min, and then air-cooling the product to room temperature to obtain the aluminum alloy section.
Compared with the prior art, the strength, hardness, toughness, wear resistance and thermal stability of the aluminum alloy section are improved by optimizing the metal formula of the aluminum alloy section, then later-stage surface treatment is utilized, oil stains in the aluminum alloy section are removed before anodic oxidation, a naturally generated oxide film is removed through acid-base electrolysis, the oxide film with uniform texture is conveniently generated in the later stage and can adapt to acid and alkaline conditions, during electrolytic oxidation treatment, a small amount of oxalic acid is added to improve the hardness of the oxide film, then boiling water is utilized to seal micropores in the oxide film, drying is carried out, the micropores are reduced, the density of the oxide film is improved, the uniformity and high compactness of the oxide film are ensured, then coating is sprayed on the aluminum alloy to form a coating layer, the covering and protecting effects are good, the density and the strength are improved, and the exposure of metal in the aluminum alloy is avoided, avoid corrosion, pollution and damage caused by aggressive ions, and has high strength and long service life. Therefore, the invention has the characteristics of improving the corrosion resistance and the pollution resistance of the aluminum alloy section.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
Example 1.
The corrosion-resistant aluminum alloy section is prepared from the following raw materials in parts by weight: 5.1-5.6 parts of Cu: 1.4-1.8 parts of Mg: 1.8-2.6 parts of Mn: 0.28-0.42 parts of Si: 0.5-1.5 parts of Fe: 0.7-1 part of Zr: 0.08 to 0.12 part, and the balance of Al and inevitable impurities.
The surface treatment method of the corrosion-resistant aluminum alloy section comprises the following steps:
a. placing the aluminum alloy in a degreasing tank, adding a degreasing agent, wherein the degreasing agent comprises 60-80g/l of sodium hydroxide, 30-50g/l of trisodium phosphate and 6-8g/l of surfactant, degreasing at 70-90 ℃, rinsing with water at 60-70 ℃, and cleaning with normal-temperature water in a flowing manner to obtain a product a;
b. putting the product a into an electrolytic tank, and adding an acid electrolyte into the electrolytic tank, wherein the acid electrolyte is prepared from the following raw materials in parts by weight: 1 part of ferrous sulfate, 1 part of copper sulfate and 0.5 part of hydrochloric acid, electrifying, and controlling the current density at 40-60 ℃ to be 6-12A/dm2Performing electrolysis for 3-5min to obtain product b;
c. putting the product b into the electrolytic tank again, and adding an alkaline electrolyte into the electrolytic tank, wherein the alkaline electrolyte comprises the following raw materials in parts by weight: 1 part of sodium hydroxide, 1 part of copper sulfate and 0.2 part of ferric chloride, electrifying, and controlling the current density at 50-80 ℃ to be 6-12A/dm2Electrolyzing for 3-5min to obtain product c;
d. placing the product c in an oxidation tank, adding 1 part of sulfuric acid, 4 parts of deionized water and 0.2 part of oxalic acid for anodic oxidation at the temperature of 12-25 ℃ and the current density of 1-2A/dm2At voltage of 13-23V for 30-40min, taking out, treating in boiling water for 30-50min, taking out, and oven drying to obtain product d; the temperature of the boiling water is 70-100 ℃.
e. And d, placing the product d in a nitrogen protective atmosphere, and spraying by using an alloy coating, wherein the alloy coating is prepared from the following raw materials in parts by weight: 50-60 parts of zinc powder, 10-20 parts of nickel powder and 5-10 parts of silicon carbide powder, mixing and grinding the materials to prepare a coating, spraying the coating on the surface of the product d with the spraying thickness of 0.4-0.6mm, then placing the product into a high-temperature furnace at 200-400 ℃ to heat for 30-60min, and then air-cooling the product to room temperature to obtain the aluminum alloy section.
Example 2.
The corrosion-resistant aluminum alloy section is prepared from the following raw materials in parts by weight: 5.2 parts, Cu: 1.4 parts of Mg: 2.3 parts, Mn: 1.30 parts, Si: 0.8 part, Fe: 0.8 part, Zr: 0.11 parts, and the balance of Al and inevitable impurities.
The surface treatment method of the corrosion-resistant aluminum alloy section comprises the following steps:
a. placing the aluminum alloy in a degreasing tank, adding a degreasing agent, wherein the degreasing agent comprises 65g/l of sodium hydroxide, 35g/l of trisodium phosphate and 7g/l of surfactant, degreasing at 80 ℃, rinsing with 65 ℃ water, and cleaning with normal-temperature water in a flowing manner to obtain a product a;
b. putting the product a into an electrolytic tank, and adding an acid electrolyte into the electrolytic tank, wherein the acid electrolyte is prepared from the following raw materials in parts by weight: 1 part of ferrous sulfate, 1 part of copper sulfate and 0.5 part of hydrochloric acid, electrifying, and controlling the current density to be 8A/dm at 40-60 DEG C2Performing electrolysis for 3min to obtain product b;
c. putting the product b into the electrolytic tank again, and adding an alkaline electrolyte into the electrolytic tank, wherein the alkaline electrolyte comprises the following raw materials in parts by weight: 1 part of sodium hydroxide, 1 part of copper sulfate and 0.2 part of ferric chloride, electrifying, and controlling the current density at 55 ℃ to be 6A/dm2Performing electrolysis for 3min to obtain product c;
d. placing the product c in an oxidation tank, adding 1 part of sulfuric acid, 4 parts of deionized water and 0.2 part of oxalic acid for anodic oxidation at the temperature of 12-25 ℃ and the current density of 1-2A/dm2At voltage of 13-23V for 30-40min, taking out, treating in boiling water for 30-50min, taking out, and oven drying to obtain product d;
e. and d, placing the product d in a nitrogen protective atmosphere, and spraying by using an alloy coating, wherein the alloy coating is prepared from the following raw materials in parts by weight: 50 parts of zinc powder, 10 parts of nickel powder and 5 parts of silicon carbide powder are mixed and ground to prepare a coating, the coating is sprayed on the surface of the product d, the spraying thickness is 0.4mm, then the product is placed into a high-temperature furnace at 200 ℃ to be heated for 30min, and then the product is air-cooled to room temperature to obtain the aluminum alloy section.
Claims (4)
1. The corrosion-resistant aluminum alloy section is characterized in that: the zinc-zinc alloy is prepared from the following raw materials in parts by weight: 5.1-5.6 parts of Cu: 1.4-1.8 parts of Mg: 1.8-2.6 parts of Mn: 0.28-0.42 parts of Si: 0.5-1.5 parts of Fe: 0.7-1 part of Zr: 0.08 to 0.12 parts by weight, and the balance of Al and inevitable impurities, and a surface treatment method thereof, comprising the steps of:
a. placing the aluminum alloy in a degreasing tank, adding a degreasing agent, degreasing at 70-90 ℃, rinsing with water at 60-70 ℃, and cleaning with normal-temperature water in a flowing manner to obtain a product a;
b. putting the product a into an electrolytic tank, adding acid electrolyte into the electrolytic tank, electrifying, and controlling the current density at 40-60 ℃ to be 6-12A/dm2Performing electrolysis for 3-5min to obtain product b;
c. putting the product b into the electrolytic tank again, adding an alkaline electrolyte into the electrolytic tank, electrifying, and controlling the current density at 50-80 ℃ to be 6-12A/dm2Electrolyzing for 3-5min to obtain product c;
d. placing the product c in an oxidation tank, adding 1 part of sulfuric acid, 4 parts of deionized water and 0.2 part of oxalic acid for anodic oxidation at the temperature of 12-25 ℃ and the current density of 1-2A/dm2At voltage of 13-23V for 30-40min, taking out, treating in boiling water for 30-50min, taking out, and oven drying to obtain product d;
e. and d, placing the product d in a nitrogen protective atmosphere, and spraying by using an alloy coating, wherein the alloy coating is prepared from the following raw materials in parts by weight: 50-60 parts of zinc powder, 10-20 parts of nickel powder and 5-10 parts of silicon carbide powder, mixing and grinding the materials to prepare a coating, spraying the coating on the surface of the product d with the spraying thickness of 0.4-0.6mm, then placing the product into a high-temperature furnace at 200-400 ℃ to heat for 30-60min, and then air-cooling the product to room temperature to obtain the aluminum alloy section.
2. The corrosion-resistant aluminum alloy profile of claim 1, wherein: in the step a, the degreasing agent comprises 60-80g/l of sodium hydroxide, 30-50g/l of trisodium phosphate and 6-8g/l of surfactant.
3. The corrosion-resistant aluminum alloy profile of claim 1, wherein: in the step b, the acid electrolyte is prepared from the following raw materials in parts by weight: 1 part of ferrous sulfate, 1 part of copper sulfate and 0.5 part of hydrochloric acid.
4. The corrosion-resistant aluminum alloy profile of claim 1, wherein: the alkali electrolyte is prepared from the following raw materials in parts by weight: 1 part of sodium hydroxide, 1 part of copper sulfate and 0.2 part of ferric chloride.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102876942A (en) * | 2012-09-04 | 2013-01-16 | 昆山市源丰铝业有限公司 | Aluminum alloy plate for vehicle |
| CN106676340A (en) * | 2016-11-28 | 2017-05-17 | 安徽省煜灿新型材料科技有限公司 | High-strength wear-resistant electrophoretic aluminum alloy profile |
| CN108048891A (en) * | 2017-11-15 | 2018-05-18 | 重庆嘉萌鸿业科技有限公司 | A kind of aluminium alloy castings surface treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102876942A (en) * | 2012-09-04 | 2013-01-16 | 昆山市源丰铝业有限公司 | Aluminum alloy plate for vehicle |
| CN106676340A (en) * | 2016-11-28 | 2017-05-17 | 安徽省煜灿新型材料科技有限公司 | High-strength wear-resistant electrophoretic aluminum alloy profile |
| CN108048891A (en) * | 2017-11-15 | 2018-05-18 | 重庆嘉萌鸿业科技有限公司 | A kind of aluminium alloy castings surface treatment method |
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