CN112064037A - Preparation method of corrosion-resistant magnesium alloy sacrificial anode - Google Patents
Preparation method of corrosion-resistant magnesium alloy sacrificial anode Download PDFInfo
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- CN112064037A CN112064037A CN202011091852.8A CN202011091852A CN112064037A CN 112064037 A CN112064037 A CN 112064037A CN 202011091852 A CN202011091852 A CN 202011091852A CN 112064037 A CN112064037 A CN 112064037A
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
- C23F13/12—Electrodes characterised by the material
- C23F13/14—Material for sacrificial anodes
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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
- C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
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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
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/38—Electroplating: Baths therefor from solutions of copper
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/18—Electroplating using modulated, pulsed or reversing current
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D9/00—Electrolytic coating other than with metals
- C25D9/04—Electrolytic coating other than with metals with inorganic materials
- C25D9/06—Electrolytic coating other than with metals with inorganic materials by anodic processes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention discloses a preparation method of a corrosion-resistant magnesium alloy sacrificial anode, which is characterized by comprising the following steps of: the preparation method comprises the following steps: firstly, performing corrosion resistance treatment on a magnesium alloy sacrificial anode material to form a corrosion-resistant layer on the surface; conducting post-treatment on the surface of the corrosion-resistant layer to finally form the corrosion-resistant conductive magnesium alloy sacrificial anode material; the technical problems that the magnesium alloy anode material in the prior art is too high in self-corrosion rate, so that the service cycle cannot be met normally, a large amount of magnesium alloy is consumed in a self-corrosion mode during protection, and the like are solved.
Description
Technical Field
The invention belongs to electrochemical corrosion and protection technology, and particularly relates to a preparation method of a corrosion-resistant magnesium alloy sacrificial anode.
Background
The sacrificial anode method is a cathode protection technology and is commonly used in the field of anticorrosion treatment of transformer substation grounding grids. The method electrically connects the sacrificial anode with lower electrode potential with the protected body (grounding net) with higher electrode potential, and plays a role in inhibiting the corrosion of the protected body by consuming anode materials and continuously providing electrons like the protected body; the anode material commonly used in the sacrificial anode is a zinc anode, an aluminum anode or a magnesium alloy anode, the magnesium alloy sacrificial anode material is less applied, however, the electron supply capacity of the magnesium alloy anode material with the same volume ratio is larger than that of the zinc anode and the aluminum anode, but the service cycle cannot be met usually because the self-corrosion rate of the magnesium alloy anode material is too high, and a large amount of magnesium alloy is consumed in a self-corrosion mode while the magnesium alloy anode material is protected.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the preparation method of the corrosion-resistant magnesium alloy sacrificial anode is provided to solve the problems that most electrons in the magnesium alloy anode material in the prior art are wasted due to the self-corrosion of the material, and only a small part of electrons are provided for a protected body, so that the magnesium alloy cannot meet the service cycle, the resource is wasted and the like.
The technical scheme of the invention is as follows:
a preparation method of a corrosion-resistant magnesium alloy sacrificial anode comprises the following steps: firstly, performing corrosion resistance treatment on a magnesium alloy sacrificial anode material to form a corrosion-resistant layer on the surface; and conducting post-treatment on the surface of the corrosion-resistant layer to finally form the corrosion-resistant conductive magnesium alloy sacrificial anode material.
The magnesium alloy sacrificial anode material is AZ31 or AZ91 magnesium alloy sacrificial anode material.
The corrosion resistant treatment adopts corrosion resistant treatment liquid, and the corrosion resistant treatment liquid comprises the following components: 10-20 g/L trisodium phosphate, 5-10g/L sodium tungstate, 2-5 g/L copper sulfate, 6-12 g/L sodium ethylene diamine tetracetate, 2-5 g/L copper acetate, 10-20 g/L silicon carbide, 2-4 g/L sodium hydroxide and 5-10g/L sodium fluoride.
The conductive post-treatment adopts post-treatment liquid, and the components of the post-treatment liquid are as follows: 2-5 g/L copper sulfate, 2-5 g/L copper acetate, 6-12 g/L sodium ethylene diamine tetracetate, 10-15g/L graphite powder and 2-4 g/L sodium hydroxide.
The method for the corrosion-resistant treatment comprises the following steps: feeding the corrosion-resistant treatment solution into a treatment tank, setting the temperature at 30 +/-5 ℃, and stirring at the speed of 400 r/min; the magnesium alloy sacrificial anode material is connected with the anode of a direct current pulse power supply, the stainless steel plate is connected with the cathode of the direct current pulse power supply, and the stainless steel plate is placed in the corrosion-resistant treatment solution at the same time, and the power supply is stopped after the treatment time is 10-18 min.
The power supply parameter of the DC pulse power supply during the corrosion resistance treatment is set to 3.5A/cm2Frequency 300 Hz and duty cycle 20%.
The conductive post-treatment method comprises the following steps: the magnesium alloy sacrificial anode material is used as a cathode to be connected with a cathode of a direct current pulse power supply, the stainless steel plate is used as an anode to be connected with an anode of the direct current pulse power supply, the stainless steel plate is placed in post-treatment liquid at the same time, and the power supply is cut off after the treatment time is 15-25 min.
The power supply parameter of the DC pulse power supply is set to be 4A/cm current during post-treatment2Frequency 300 Hz and duty cycle 40%.
The invention has the beneficial effects that:
firstly, performing corrosion resistance treatment on a magnesium alloy sacrificial anode material to form a corrosion-resistant layer on the surface; conducting post-treatment on the surface of the corrosion-resistant layer to finally form a corrosion-resistant conductive magnesium alloy sacrificial anode material; the defect of high self-corrosion rate of the magnesium alloy sacrificial anode at present is overcome, the self-corrosion rate of the magnesium alloy sacrificial anode material is greatly reduced, the corrosion resistance is improved, and the conductivity of the magnesium alloy sacrificial anode is ensured, so that the design service cycle of the sacrificial anode material is met; the technical problems that the magnesium alloy anode material in the prior art is too high in self-corrosion rate, so that the service cycle cannot be met normally, a large amount of magnesium alloy is consumed in a self-corrosion mode during protection, and the like are solved.
Detailed Description
A preparation method of a corrosion-resistant magnesium alloy sacrificial anode comprises the following steps: firstly, performing corrosion resistance treatment on a magnesium alloy sacrificial anode material to form a corrosion-resistant layer on the surface; and conducting post-treatment on the surface of the corrosion-resistant layer to finally form the corrosion-resistant conductive magnesium alloy sacrificial anode material.
The magnesium alloy sacrificial anode material is AZ31 or AZ series magnesium alloy sacrificial anode materials such as AZ 91.
The corrosion-resistant treatment adopts corrosion-resistant treatment liquid, and the corrosion-resistant treatment liquid comprises the following components in percentage by liter: 10-20 g/L trisodium phosphate, 5-10g/L sodium tungstate, 2-5 g/L copper sulfate, 6-12 g/L sodium ethylene diamine tetracetate, 2-5 g/L copper acetate, 10-20 g/L silicon carbide, 2-4 g/L sodium hydroxide and 5-10g/L sodium fluoride; the balance of deionized water.
As a sacrificial anode material, the formula of the treatment solution is different from the prior art in that a protective layer of copper oxide is provided above the magnesium alloy, and the protective layer is beneficial to the implementation of the next conductive post-treatment; if the conductive post-treatment layer is replaced by the conductive post-treatment layer prepared by the formula in the prior art, the post-treatment layer cannot have good bonding force with the corrosion-resistant layer.
The conductive post-treatment adopts post-treatment liquid, and the components of the post-treatment liquid are as follows: 2-5 g/L copper sulfate, 2-5 g/L copper acetate, 6-12 g/L sodium ethylene diamine tetracetate, 10-15g/L graphite powder and 2-4 g/L sodium hydroxide. The balance of deionized water.
The post-treatment fluid formula aims to: the conductive post-treatment liquid can be used for adhering a layer of copper and a small amount of carbon on the surface of the material, so that the conductive post-treatment liquid is conductive.
The method for the corrosion-resistant treatment comprises the following steps: feeding the corrosion-resistant treatment solution into a treatment tank, setting the temperature at 30 +/-5 ℃, and stirring at the speed of 400 r/min; the purpose of stirring is to reduce the temperature of the solution during the corrosion-resistant treatment. The magnesium alloy sacrificial anode material is connected with the anode of a direct current pulse power supply, the stainless steel plate is connected with the cathode of the direct current pulse power supply, and the stainless steel plate is placed in the corrosion-resistant treatment solution, and the power supply is stopped after the treatment time is 10-18 min, so that the corrosion-resistant layer is prevented from being too thin or uneven.
The power supply parameter of the DC pulse power supply during the corrosion resistance treatment is set to 3.5A/cm2Frequency 300 Hz and duty cycle 20%. The parameter is set to make the appearance of the corrosion-resistant coating uniform in the corrosion-resistant treatment.
The conductive post-treatment method comprises the following steps: the magnesium alloy sacrificial anode material is used as a cathode to be connected with a cathode of a direct current pulse power supply, the stainless steel plate is used as an anode to be connected with an anode of the direct current pulse power supply, the stainless steel plate is placed in post-treatment liquid at the same time, and the power supply is cut off after the treatment time is 15-25 min. The time should not be too long or too short, which would result in the conductive layer being substantially intact, and long time which would result in damage to the corrosion resistant coating.
The power supply parameter of the DC pulse power supply is set to be 4A/cm current during post-treatment2Frequency 300 Hz, duty ratio 40%; the optimized parameters are set, so that the corrosion-resistant coating is uniform in appearance and cannot be damaged.
Claims (8)
1. A preparation method of a corrosion-resistant magnesium alloy sacrificial anode is characterized by comprising the following steps: the preparation method comprises the following steps: firstly, performing corrosion resistance treatment on a magnesium alloy sacrificial anode material to form a corrosion-resistant layer on the surface; and conducting post-treatment on the surface of the corrosion-resistant layer to finally form the corrosion-resistant conductive magnesium alloy sacrificial anode material.
2. The method for preparing the corrosion-resistant magnesium alloy sacrificial anode according to claim 1, wherein the method comprises the following steps: the magnesium alloy sacrificial anode material is AZ31 or AZ91 magnesium alloy sacrificial anode material.
3. The method for preparing the corrosion-resistant magnesium alloy sacrificial anode according to claim 1, wherein the method comprises the following steps: the corrosion resistant treatment adopts corrosion resistant treatment liquid, and the corrosion resistant treatment liquid comprises the following components: 10-20 g/L trisodium phosphate, 5-10g/L sodium tungstate, 2-5 g/L copper sulfate, 6-12 g/L sodium ethylene diamine tetracetate, 2-5 g/L copper acetate, 10-20 g/L silicon carbide, 2-4 g/L sodium hydroxide and 5-10g/L sodium fluoride.
4. The method for preparing the corrosion-resistant magnesium alloy sacrificial anode according to claim 1, wherein the method comprises the following steps: the conductive post-treatment adopts post-treatment liquid, and the components of the post-treatment liquid are as follows: 2-5 g/L copper sulfate, 2-5 g/L copper acetate, 6-12 g/L sodium ethylene diamine tetracetate, 10-15g/L graphite powder and 2-4 g/L sodium hydroxide.
5. The method for preparing the corrosion-resistant magnesium alloy sacrificial anode according to claim 1, wherein the method comprises the following steps: the method for the corrosion-resistant treatment comprises the following steps: feeding the corrosion-resistant treatment solution into a treatment tank, setting the temperature at 30 +/-5 ℃, and stirring at the speed of 400 r/min; the magnesium alloy sacrificial anode material is connected with the anode of a direct current pulse power supply, the stainless steel plate is connected with the cathode of the direct current pulse power supply, and the stainless steel plate is placed in the corrosion-resistant treatment solution at the same time, and the power supply is stopped after the treatment time is 10-18 min.
6. The method for preparing the corrosion-resistant magnesium alloy sacrificial anode according to claim 5, wherein the method comprises the following steps: the power supply parameter of the DC pulse power supply during the corrosion resistance treatment is set to 3.5A/cm2Frequency 300 Hz and duty cycle 20%.
7. The method for preparing the corrosion-resistant magnesium alloy sacrificial anode according to claim 1, wherein the method comprises the following steps: the conductive post-treatment method comprises the following steps: the magnesium alloy sacrificial anode material is used as a cathode to be connected with a cathode of a direct current pulse power supply, the stainless steel plate is used as an anode to be connected with an anode of the direct current pulse power supply, the stainless steel plate is placed in post-treatment liquid at the same time, and the power supply is cut off after the treatment time is 15-25 min.
8. The method for preparing the corrosion-resistant magnesium alloy sacrificial anode according to claim 7, wherein the method comprises the following steps: the power supply parameter of the DC pulse power supply is set to be 4A/cm current during post-treatment2Frequency 300 Hz and duty cycle 40%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114934275A (en) * | 2022-06-13 | 2022-08-23 | 贵州电网有限责任公司 | Preparation method of magnesium alloy sacrificial anode material with high current efficiency and low corrosion rate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114934275A (en) * | 2022-06-13 | 2022-08-23 | 贵州电网有限责任公司 | Preparation method of magnesium alloy sacrificial anode material with high current efficiency and low corrosion rate |
| CN114934275B (en) * | 2022-06-13 | 2024-02-23 | 贵州电网有限责任公司 | Preparation method of magnesium alloy sacrificial anode material with high current efficiency and low corrosion rate |
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