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用于AZ31B镁合金优异防腐的环氧涂层中的高度取向绢云母纳米片

Highly Orientated Sericite Nanosheets in Epoxy Coating for Excellent Corrosion Protection of AZ31B Mg Alloy.

作者信息

Wu Hao, Xi Ke, Huang Yan, Zheng Zena, Wu Zhenghua, Liu Ruolin, Zhou Chilou, Xu Yao, Du Hao, Yin Yansheng

机构信息

Guangdong Key Laboratory of Materials and Equipment in Harsh Marine Environment, Guangzhou Maritime University, Guangzhou 510725, China.

School of Naval Architecture and Ocean Engineering, Guangzhou Maritime University, Guangzhou 510725, China.

出版信息

Nanomaterials (Basel). 2023 Aug 11;13(16):2310. doi: 10.3390/nano13162310.

DOI:10.3390/nano13162310
PMID:37630895
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10457806/
Abstract

The growing demands for material longevity in marine environments necessitate the development of highly efficient, low-cost, and durable corrosion-protective coatings. Although magnesium alloys are widely used in the automotive and aerospace industries, severe corrosion issues still hinder their long-term service in naval architecture. In the present work, an epoxy composite coating containing sericite nanosheets is prepared on the AZ31B Mg alloy using a one-step electrophoretic deposition method to improve corrosion resistance. Due to the polyetherimide (PEI) modification, positively charged sericite nanosheets can be highly orientated in an epoxy coating under the influence of an electric field. The sericite-incorporated epoxy coating prepared in the emulsion with 4 wt.% sericite exhibits the highest corrosion resistance, with its corrosion current density being 6 orders of magnitude lower than that of the substrate. Electrochemical measurements and immersion tests showed that the highly orientated sericite nanosheets in the epoxy coating have an excellent barrier effect against corrosive media, thus significantly improving the long-term anti-corrosion performance of the epoxy coating. This work provides new insight into the design of lamellar filler/epoxy coatings with superior anticorrosion performance and shows promise in the corrosion protection of magnesium alloys.

摘要

海洋环境中对材料耐久性的需求不断增长，这就需要开发高效、低成本且耐用的防腐涂层。尽管镁合金在汽车和航空航天工业中广泛应用，但严重的腐蚀问题仍阻碍其在船舶工程中的长期使用。在本工作中，采用一步电泳沉积法在AZ31B镁合金上制备了含绢云母纳米片的环氧复合涂层，以提高其耐腐蚀性。由于聚醚酰亚胺（PEI）改性，带正电的绢云母纳米片在电场作用下可在环氧涂层中高度取向。在含4 wt.%绢云母的乳液中制备的含绢云母环氧涂层具有最高的耐腐蚀性，其腐蚀电流密度比基体低6个数量级。电化学测量和浸泡试验表明，环氧涂层中高度取向的绢云母纳米片对腐蚀性介质具有优异的阻隔作用，从而显著提高了环氧涂层的长期防腐性能。这项工作为设计具有优异防腐性能的层状填料/环氧涂层提供了新的思路，并在镁合金的腐蚀防护方面展现出前景。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/319ba8119b70/nanomaterials-13-02310-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/579ba1e08814/nanomaterials-13-02310-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/ef82185d3867/nanomaterials-13-02310-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/a44acafd9487/nanomaterials-13-02310-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/cb32fad9d89e/nanomaterials-13-02310-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/0477f68636e8/nanomaterials-13-02310-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/8e965836fea8/nanomaterials-13-02310-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/26a174b31c69/nanomaterials-13-02310-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/ee2ac1195443/nanomaterials-13-02310-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/06fbe3ec2b35/nanomaterials-13-02310-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/ca672c629b29/nanomaterials-13-02310-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/8382f8e4983c/nanomaterials-13-02310-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/e94b49cd47f6/nanomaterials-13-02310-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/319ba8119b70/nanomaterials-13-02310-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/579ba1e08814/nanomaterials-13-02310-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/ef82185d3867/nanomaterials-13-02310-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/a44acafd9487/nanomaterials-13-02310-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/cb32fad9d89e/nanomaterials-13-02310-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/0477f68636e8/nanomaterials-13-02310-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/8e965836fea8/nanomaterials-13-02310-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/26a174b31c69/nanomaterials-13-02310-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/ee2ac1195443/nanomaterials-13-02310-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/06fbe3ec2b35/nanomaterials-13-02310-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/ca672c629b29/nanomaterials-13-02310-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/8382f8e4983c/nanomaterials-13-02310-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/e94b49cd47f6/nanomaterials-13-02310-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/42ee/10457806/319ba8119b70/nanomaterials-13-02310-g013.jpg

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