鋁合金表面水滑石薄膜的制備及其耐蝕性研究進展

彭光春; 賈文超; 喬芊芊; 張展; 黃康; 張天翼; 方濤; 王怡; 張博威

doi:10.13374/j.issn2095-9389.2019.08.28.003

鋁合金表面水滑石薄膜的制備及其耐蝕性研究進展

doi: 10.13374/j.issn2095-9389.2019.08.28.003

北京科技大學新材料技術研究院，北京 100083

基金項目: 國家自然科學基金青年科學基金資助項目（51901018）；中國博士后科學基金資助項目（2019M660456）；中央高校基本科研業務費資助項目（06500119）

詳細信息

通訊作者:
E-mail：bwzhang@ustb.edu.cn

中圖分類號: TG150.30
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- 文章訪問數: 2045
- HTML全文瀏覽量: 1922
- PDF下載量: 88
- 被引次數: 0
出版歷程
- 收稿日期: 2019-08-28
- 刊出日期: 2020-01-01

Research progress on the preparation and corrosion resistance of layered double hydroxides film on aluminum alloys

Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

More Information

Corresponding author: E-mail: bwzhang@ustb.edu.cn

摘要

摘要: 鋁合金具有密度小，比強度高等一系列優異的性能而受到研究者的關注，但其易腐蝕的特點嚴重制約了其應用范圍，因此需要采取適當的方法增強其耐蝕性能。水滑石薄膜具有良好的耐蝕性與離子交換性能，近年來在鋁合金表面改性技術的研究逐漸增多。本文介紹了多種制備水滑石薄膜的方法，探究不同實驗條件對薄膜形貌與耐蝕性的影響；詳述了幾種常用的改性方法與原理，對目前研究中存在的局限性進行了討論，并展望了未來研究的重點與發展方向。
- 鋁合金 /
- 水滑石 /
- 表面改性 /
- 耐蝕性 /
- 原位生長
Abstract: Aluminum alloys have excellent properties such as low density and high strength-to-weight ratio. However, the negative standard electrode potential of aluminum leads to a more active chemical property and is prone to corrode; as a result, the poor corrosion resistance extremely limits the widespread application of aluminum. Therefore, it is necessary to take appropriate measures to improve the poor corrosion resistance of aluminum alloys. The chromate passivation technology is one of the most effective and mature aluminum alloy surface treatment technologies, and even if the formed passivation film is very thin, it can still greatly enhance the corrosion resistance of aluminum alloys and provide corrosion protection. However, Cr (VI) and its derivatives are highly toxic and carcinogenic, and they are harmful to the environment and the human body. As environmental awareness increases and the government strictly limits the use and emission of chromate, it is necessary to develop new treatments that are environmentally friendly and non-toxic to improve the corrosion resistance of aluminum alloys. The fabrication process of layered double hydroxides (LDHs) film is simple, and the morphology of the LDHs film can be controlled by adjusting the experimental parameters. The prepared LDHs film also has good corrosion resistance and anions exchange performance. Therefore, reports of in-situ growth LDHs film on the surface aluminum alloys have gradually increased in recent years. In this paper, we introduced a variety of methods for preparing LDHs film, such as ordinary hydrothermal, urea hydrolysis, and hexamethylenetetramine hydrolysis methods, and summarized the effects of different experimental conditions on the morphology and corrosion resistance of LDHs the films. Several commonly used modification methods and principles, such as the preparation of superhydrophobic films and self-healing films, were discussed in detail and the limitations of the current research were discussed. Finally, the focus of future research and development were described.
- aluminum alloys /
- layered double hydroxides /
- surface modification /
- corrosion resistance /
- in-situ grow

HTML全文

圖 1 不同Zn²⁺濃度條件下在AA2024鋁合金基體制備的Zn?Al水滑石薄膜的掃描電鏡圖. （a,b） 5 mmol?L^?1 Zn²⁺；（c,d） 50 mmol?L^?1 Zn²⁺；（e,f） 500 mmol?L^?1 Zn²⁺

Figure 1. SEM images of AA2024-T3 substrates covered with Zn?Al LDHs thin film prepared under different Zn²⁺ concentrations: (a,b) 5 mmol?L^?1 Zn²⁺; (c,d) 50 mmol?L^?1 Zn²⁺; (e,f) 500 mmol?L^?1 Zn²⁺

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圖 2 復合涂層的形貌圖. （a）鋁合金；（b）微弧氧化陶瓷層；（c）微弧氧化/Zn?Al水滑石薄膜；（d）負載釩酸根的微弧氧化/Zn?Al水滑石薄膜

Figure 2. SEM images of composite coatings: (a) aluminum alloys; (b) MAO ceramic layer; (c) MAO/Zn?Al LDHs thin film; (d) MAO/Zn?Al?VO_x LDHs thin film

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圖 3 水熱處理30 min后的微弧氧化/Zn?Al水滑石薄膜的掃描電鏡圖像。（a）微孔；（b）微裂紋

Figure 3. SEM images of the MAO/Zn?Al LDHs thin films after 30 min hydrothermal treatment: (a) micro-pores; (b) micro-cracks

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圖 4 不同樣品表面的水滴形狀與相應的接觸角。（a）鋁合金；（b）月桂酸改性的鋁合金；（c）Zn?Al水滑石薄膜；（d）月桂酸改性后的Zn?Al水滑石薄膜

Figure 4. Shapes of water droplets on the surface of different samples and corresponding CAs: (a) Al alloys; (b) Al?La; (c) Zn?Al LDHs thin film; (d) Zn?Al LDHs?La thin film

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圖 5 負載月桂酸根的Zn?Al水滑石薄膜的耐蝕性保護機制示意圖

Figure 5. Schematic illustration of the corrosion protection mechanism for the Zn?Al LDHs thin film loaded with laurate anions

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圖 6 不同水滑石薄膜樣品用1H，1H，2H，2H-全氟癸基三甲氧基硅烷進行表面改性后的接觸角與對應水滴照片。（a） Mg?Al水滑石，接觸角為168.8°; （b） Co?Al水滑石，接觸角為169.6°；（c） Ni?Al水滑石，接觸角為165.8°；（d） Zn?Al水滑石，接觸角為164.2°

Figure 6. CA of different LDHs thin film samples with surface modification with PFDTMS and the corresponding photographs of water droplets on the surfaces: (a) Mg?Al LDHs, CA=168.8°; (b) Co?Al LDHs, CA=169.6°; (c) Ni?Al LDHs, CA=165.8°; (d) Zn?Al LDHs, CA=164.2°

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圖 7 水滑石薄膜捕獲Cl^?與釋放緩蝕劑的示意圖^[9]

Figure 7. Schematic representation of the entrapment Cl^? and the triggered release of anionic corrosion inhibitors from LDHs

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圖 8 具有兩個針孔缺陷的Zn?Al?NaVO₃水滑石薄膜浸泡不同時間后的掃描振動電極圖與光學照片

Figure 8. SVET maps and optical photographs of a sample of Zn?Al?NaVO₃ LDHs thin film with two pin-hole defects

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圖 9 Li?Al天冬氨酸水滑石薄膜微觀形貌分析。（a）截面形貌；（b）表面形貌；具有人工劃痕的Li?Al天冬氨酸水滑石薄膜在3.5%（質量分數）NaCl溶液浸泡不同時間后的形貌，（c） 0；（d） 2 d；（e） 6 d；（f） 9 d；（g） 20 d

Figure 9. SEM images of Li?Al?Asp LDHs: (a) cross-section; (b) surface; SEM images of Li?Al?Asp LDHs with artificial scratch after immersion in 3.5% (mass fraction) NaCl solution for different times: (c) 0; (d) 2 d; (e) 6 d; (f) 9 d; (g) 20 d

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圖 10 在0.05 mol·L^?1的NaCl溶液中鋁合金與負載不同緩釋的水滑石薄膜的極化曲線

Figure 10. Polarization curves of the bare Al alloy and LDHs loaded with different corrosion inhibitor samples in 0.05 mol·L^?1 NaCl solution

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圖 11 不同方法處理后的水滑石薄膜培養24 h后的菌落照片。（a）大腸桿菌；（b）枯草芽孢桿菌

Figure 11. Photograph of bacterial colonies after incubation with different LDHs coatings for 24 h: (a) E. coli; (b) B. subtilis

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