CN104561962A - Preparation method for aluminum and aluminum alloy surface coating - Google Patents
Preparation method for aluminum and aluminum alloy surface coating Download PDFInfo
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- CN104561962A CN104561962A CN201410819868.4A CN201410819868A CN104561962A CN 104561962 A CN104561962 A CN 104561962A CN 201410819868 A CN201410819868 A CN 201410819868A CN 104561962 A CN104561962 A CN 104561962A
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Abstract
The invention discloses a preparation method for an aluminum and aluminum alloy surface coating. In a preparation process, an aluminum plate is uniformly wrapped with graphene, and a dense graphene coating is formed on the surface of the aluminum plate. The method specifically comprises the following steps: preparing a graphene oxide sheet by taking graphite as a raw material, and performing ultrasonic dispersion on the graphene oxide sheet in de-ionized water to obtain a graphene oxide aqueous solution; impregnating the aluminum plate in the graphene oxide aqueous solution; drying the impregnated aluminum plate; performing reduction treatment on the dried aluminum plate to form a uniform and dense graphene protective layer on the surface of the aluminum plate by virtue of a NaBH4 solution. According to the method, the corrosion rate of the aluminum plate can be remarkably lowered, and the corrosion resistance of the aluminum plate can be improved.
Description
Technical field
The present invention relates to the general suppression technology field of a kind of metallic material corrosion and incrustation, specifically, relate to the preparation method of Al and Alalloy top coat.
Background technology
Metallic corrosion is dispersed throughout all trades and professions and is the world problem of a seriousness, and according to world's authoritative department statistics, annual metallic corrosion quantity accounts for about 1/3rd of annual world production total amount, and can directly or indirectly cause a large amount of financial loss or safety problem.Therefore the research that a large amount of people has all been dropped in countries in the world, thing, financial resources are protected for metallic corrosion.At present, adopt protective system to be used for metallic corrosion protection and become metallic corrosion protection Main Means.Anticorrosion with coat has economy, the feature such as applied widely, convenient and swift, and has decoration functions.
Current protective system is mainly based on organic composite material and precious metal.Wherein organic composite material has the advantages such as mechanical property is high, cure shrinkage is little, strong adhesion, good stability, good manufacturability, chemical proof are excellent, but also there is the shortcomings such as preparation technology's very complicated; Precious metal coating has the advantage such as strong adhesion, low-temperature curing performance, excellent chemicals-resistant and oil-proofness, excellent wear resistance, but its cost is too high, cannot suitability for industrialized production.
Summary of the invention
The object of this invention is to provide a kind of preparation method of Al and Alalloy top coat, solve the problem that in prior art, metallic aluminium corrosion is fast and corrosion prevention cost is high.
The present invention is achieved by following technical proposals: a kind of preparation method of Al and Alalloy top coat, comprises the following steps:
(1) be that graphene oxide sheet prepared by raw material with graphite, graphene oxide sheet be placed on deionized water for ultrasonic dispersion and obtain graphene oxide water solution;
(2) aluminium sheet is soaked in graphene oxide water solution;
(3) by the aluminium sheet drying treatment after immersion;
(4) dried aluminium sheet is through NaBH
4solution reduction process, namely forms the Graphene protective layer of even compact in surface of aluminum plate.
Described step (2) soaking temperature is 25 DEG C-100 DEG C.
The pH value of described step (2) soaking solution is 5-10.
The NaBH of described step (4)
4strength of solution is 0.05mol/L-0.1mol/L.
The invention has the beneficial effects as follows: the inventive method by forming the Graphene protective layer of even compact on Al and Alalloy surface, and then improves the erosion resistance of bipolar plates under the prerequisite not affecting Al and Alalloy performance.The present invention is cheaply raw materials used, and method of modifying is simple, and process operation is easy, and modified aluminium sheet is compared with aluminium sheet before modified, and its corrosion electric current density significantly reduces, and namely corrosion resistance strengthens.
Accompanying drawing explanation
Fig. 1 is the opticmicroscope figure of not modified surface of aluminum plate;
Fig. 2 is the opticmicroscope figure of the surface of aluminum plate through GO aqueous solution soaking;
Fig. 3 is through NaBH after GO aqueous solution soaking
4the surface of aluminum plate opticmicroscope figure of solution reduction;
Fig. 4 is the laser Raman spectroscopy figure of the surface of aluminum plate through GO aqueous solution soaking;
Fig. 5 is through NaBH after GO aqueous solution soaking
4the laser Raman spectroscopy figure of the surface of aluminum plate of solution reduction;
Fig. 6 is the Tafel curve of not modified aluminium sheet;
Fig. 7 for by aluminium sheet in 25 DEG C, be immersed under pH=5 condition after the GO aqueous solution through 0.05mol/L NaBH
4the Tafel curve of the aluminium sheet after solution reduction process;
Fig. 8 for by aluminium sheet in 25 DEG C, be immersed under pH=8 condition after the GO aqueous solution through 0.075mol/L NaBH
4the Tafel curve of the aluminium sheet after solution reduction process;
Fig. 9 for by aluminium sheet in 25 DEG C, be immersed under pH=10 condition after the GO aqueous solution through 0.1mol/L NaBH
4the Tafel curve of the aluminium sheet after solution reduction process;
Figure 10 for by aluminium sheet in 60 DEG C, be immersed under pH=8 condition after the GO aqueous solution through 0.1mol/L NaBH
4the Tafel curve of the aluminium sheet after solution reduction process;
Figure 11 for by aluminium sheet in 60 DEG C, be immersed under pH=10 condition after the GO aqueous solution through 0.05mol/LNaBH
4the Tafel curve of the aluminium sheet after solution reduction process;
Figure 12 for by aluminium sheet in 60 DEG C, be immersed under pH=8 condition after the GO aqueous solution through 0.075mol/LNaBH
4the Tafel curve of the aluminium sheet after solution reduction process;
Figure 13 for by aluminium sheet in 100 DEG C, be immersed under pH=10 condition after the GO aqueous solution through 0.075mol/LNaBH
4the Tafel curve of the aluminium sheet after solution reduction process;
Figure 14 for by aluminium sheet in 100 DEG C, be immersed under pH=5 condition after the GO aqueous solution through 0.1mol/L NaBH
4the Tafel curve of the aluminium sheet after solution reduction process;
Figure 15 for by aluminium sheet in 100 DEG C, be immersed under pH=5 condition after the GO aqueous solution through 0.05mol/LNaBH
4the Tafel curve of the aluminium sheet after solution reduction process.
Embodiment
In order to further illustrate the present invention, enumerate following examples, but the present invention is not by the restriction of given embodiment.
Embodiment 1
Be immersed in by aluminium sheet in graphene oxide (GO) aqueous solution of 0.5mg/mL, soak 24h, soaking temperature is 25 DEG C, and immersion potential of hydrogen is pH=5; Aluminium sheet after soaking is carried out drying treatment, and drying temperature is 60 DEG C; Dried aluminium sheet is carried out through 0.05mol/LNaBH
4solution reduction process 40min, surveys its Tafel curve with electrochemical workstation, and calculating its corrosion current is 0.13 μ A/cm
2.
Embodiment 2
Be immersed in by aluminium sheet in graphene oxide (GO) aqueous solution of 0.7mg/mL, soak 24h, soaking temperature is 25 DEG C, and immersion potential of hydrogen is pH=8; Aluminium sheet after soaking is carried out drying treatment, and drying temperature is 60 DEG C; Dried aluminium sheet is carried out through 0.075mol/LNaBH
4solution reduction process 60min, surveys its Tafel curve with electrochemical workstation, and calculating its corrosion current is 2.73 μ A/cm
2.
Embodiment 3
Be immersed in by aluminium sheet in graphene oxide (GO) aqueous solution of 0.5mg/mL, soak 16h, soaking temperature is 25 DEG C, and immersion potential of hydrogen is pH=10; Aluminium sheet after soaking is carried out drying treatment, and drying temperature is 60 DEG C; Dried aluminium sheet is carried out through 0.1mol/LNaBH
4solution reduction process 40min, surveys its Tafel curve with electrochemical workstation, and calculating its corrosion current is 5.21 μ A/cm
2.
Embodiment 4
Be immersed in by aluminium sheet in graphene oxide (GO) aqueous solution of 0.5mg/mL, soak 16h, soaking temperature is 60 DEG C, and immersion potential of hydrogen is pH=8; Aluminium sheet after soaking is carried out drying treatment, and drying temperature is 60 DEG C; Dried aluminium sheet is carried out through 0.1mol/LNaBH
4solution reduction process 40min, surveys its Tafel curve with electrochemical workstation, and calculating its corrosion current is 2.62 μ A/cm
2.
Embodiment 5
Be immersed in by aluminium sheet in graphene oxide (GO) aqueous solution of 1.0mg/mL, soak 24h, soaking temperature is 60 DEG C, and immersion potential of hydrogen is pH=10; Aluminium sheet after soaking is carried out drying treatment, and drying temperature is 60 DEG C; Dried aluminium sheet is carried out through 0.05mol/LNaBH
4solution reduction process 40min, surveys its Tafel curve with electrochemical workstation, and calculating its corrosion current is 6.03 μ A/cm
2.
Embodiment 6
Be immersed in by aluminium sheet in graphene oxide (GO) aqueous solution of 0.5mg/mL, soak 24h, soaking temperature is 60 DEG C, and immersion potential of hydrogen is pH=8; Aluminium sheet after soaking is carried out drying treatment, and drying temperature is 40 DEG C; Dried aluminium sheet is carried out through 0.075mol/LNaBH
4solution reduction process 40min, surveys its Tafel curve with electrochemical workstation, and calculating its corrosion current is 0.06 μ A/cm
2.
Embodiment 7
Be immersed in by aluminium sheet in graphene oxide (GO) aqueous solution of 0.5mg/mL, soak 24h, soaking temperature is 100 DEG C, and immersion potential of hydrogen is pH=10; Aluminium sheet after soaking is carried out drying treatment, and drying temperature is 60 DEG C; Dried aluminium sheet is carried out through 0.075mol/LNaBH
4solution reduction process 80min, surveys its Tafel curve with electrochemical workstation, and calculating its corrosion current is 8.16 μ A/cm
2.
Embodiment 8
Be immersed in by aluminium sheet in graphene oxide (GO) aqueous solution of 0.5mg/mL, soak 24h, soaking temperature is 100 DEG C, and immersion potential of hydrogen is pH=5; Aluminium sheet after soaking is carried out drying treatment, and drying temperature is 80 DEG C; Dried aluminium sheet is carried out through 0.1mol/LNaBH
4solution reduction process 40min, surveys its Tafel curve with electrochemical workstation, and calculating its corrosion current is 0.27 μ A/cm
2.
Embodiment 9
Be immersed in by aluminium sheet in graphene oxide (GO) aqueous solution of 0.075mg/mL, soak 16h, soaking temperature is 100 DEG C, and immersion potential of hydrogen is pH=5; Aluminium sheet after soaking is carried out drying treatment, and drying temperature is 80 DEG C; (3) dried aluminium sheet is carried out through 0.05mol/LNaBH
4solution reduction process 40min, surveys its Tafel curve with electrochemical workstation, and calculating its corrosion current is 5.62 μ A/cm
2.
Comparative example
Get the aluminium sheet without any process, survey its Tafel curve with electrochemical workstation, calculating its corrosion current is 162 μ A/cm
2.
Although invention has been described by reference to the accompanying drawings above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; for the person of ordinary skill of the art; under the prerequisite not departing from inventive principle, can also make some improvements and modifications, these improvements and modifications all belong to protection scope of the present invention.
Claims (4)
1. a preparation method for Al and Alalloy top coat, is characterized in that, comprises the following steps:
(1) be that graphene oxide sheet prepared by raw material with graphite, graphene oxide sheet be placed on deionized water for ultrasonic dispersion and obtain graphene oxide water solution;
(2) aluminium sheet is soaked in graphene oxide water solution;
(3) by the aluminium sheet drying treatment after immersion;
(4) dried aluminium sheet is through NaBH
4solution reduction process, namely forms the Graphene protective layer of even compact in surface of aluminum plate.
2. the preparation method of the Al and Alalloy top coat according to claims 1, is characterized in that, described step (2) soaking temperature is 25 DEG C-100 DEG C.
3. the preparation method of the Al and Alalloy top coat according to claims 1, is characterized in that, the pH value of described step (2) soaking solution is 5-10.
4. the preparation method of the top coat of the Al and Alalloy according to claims 2, is characterized in that, the NaBH of described step (4)
4strength of solution is 0.05mol/L-0.1mol/L.
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| CN201410819868.4A CN104561962A (en) | 2014-12-24 | 2014-12-24 | Preparation method for aluminum and aluminum alloy surface coating |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105215346A (en) * | 2015-08-30 | 2016-01-06 | 常州市鼎日环保科技有限公司 | A kind of preparation method being attached to ironing surface graphene oxide anticorrosive coat |
| CN107425209A (en) * | 2017-06-20 | 2017-12-01 | 天津大学 | A kind of conductive corrosion-inhibiting coating technique of aluminum flow-field plate |
| CN107498061A (en) * | 2017-06-26 | 2017-12-22 | 中北大学 | A kind of graphene aluminium-based powder composite preparation method for selective laser melting shaping |
| CN109183007A (en) * | 2018-07-17 | 2019-01-11 | 中国原子能科学研究院 | A kind of technique preparing graphite ene coatings in metal surface |
| CN113861873A (en) * | 2021-10-09 | 2021-12-31 | 惠州市昌达胶粘制品有限公司 | High-efficient radiating heat conduction sticky tape |
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| CN103387226A (en) * | 2013-07-05 | 2013-11-13 | 清华大学深圳研究生院 | Preparation method for graphene |
| CN103641104A (en) * | 2013-11-22 | 2014-03-19 | 简玉君 | Preparation method of graphene |
| CN104018144A (en) * | 2014-06-20 | 2014-09-03 | 合肥长城制冷科技有限公司 | Aluminum alloy surface anticorrosion process |
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| CN103120938A (en) * | 2013-03-04 | 2013-05-29 | 北京化工大学常州先进材料研究院 | Preparation method of Pd/graphene nano electro-catalyst |
| CN103387226A (en) * | 2013-07-05 | 2013-11-13 | 清华大学深圳研究生院 | Preparation method for graphene |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105215346A (en) * | 2015-08-30 | 2016-01-06 | 常州市鼎日环保科技有限公司 | A kind of preparation method being attached to ironing surface graphene oxide anticorrosive coat |
| CN107425209A (en) * | 2017-06-20 | 2017-12-01 | 天津大学 | A kind of conductive corrosion-inhibiting coating technique of aluminum flow-field plate |
| CN107425209B (en) * | 2017-06-20 | 2020-09-01 | 天津大学 | Conductive anticorrosive coating process for aluminum flow field plate |
| CN107498061A (en) * | 2017-06-26 | 2017-12-22 | 中北大学 | A kind of graphene aluminium-based powder composite preparation method for selective laser melting shaping |
| CN109183007A (en) * | 2018-07-17 | 2019-01-11 | 中国原子能科学研究院 | A kind of technique preparing graphite ene coatings in metal surface |
| WO2020015475A1 (en) * | 2018-07-17 | 2020-01-23 | 中国原子能科学研究院 | Method for preparing graphene coating on the surface of metal |
| JP2021530617A (en) * | 2018-07-17 | 2021-11-11 | 中国原子能科学研究院China Institute Of Atomic Energy | How to make a graphene coating layer on a metal surface |
| EP3812482A4 (en) * | 2018-07-17 | 2021-12-01 | China Institute of Atomic Energy | Method for preparing graphene coating on the surface of metal |
| JP7096422B2 (en) | 2018-07-17 | 2022-07-05 | 中国原子能科学研究院 | How to make a graphene coating layer on a metal surface |
| CN113861873A (en) * | 2021-10-09 | 2021-12-31 | 惠州市昌达胶粘制品有限公司 | High-efficient radiating heat conduction sticky tape |
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