Polydopamine modified ultrathin hydroxyapatite nanosheets for anti-corrosion reinforcement in polymeric coatings

被引：163

作者：

Cheng, Li ^{[1
,2
]}

Wu, Hao ^{[1
,3
]}

Li, Jia ^{[1
,3
]}

Zhao, Haichao ^{[1
]}

Wang, Liping ^{[1
]}

机构：

[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Key Lab Marine Mat & Related Technol, Zhejiang Key Lab Marine Mat & Protect Technol, Ningbo 315201, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China

[3] Univ Sci & Technol China, Nano Sci & Technol Inst, Suzhou 215123, Peoples R China

来源：

CORROSION SCIENCE | 2021年 / 178卷

基金：

中国国家自然科学基金;

关键词：

Hydroxyapatite nanosheet; Polydopamine; Corrosion protection; CORROSION PROTECTION PERFORMANCE; COATED GRAPHENE OXIDE; MILD-STEEL; NANOCOMPOSITE COATINGS; BORON-NITRIDE; CARBON-STEEL; EPOXY; RESISTANCE; BEHAVIOR; FILMS;

D O I：

10.1016/j.corsci.2020.109064

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

It is known that two-dimensional nanosheets such as graphene, hexagonal boron nitride and layered double hydroxide can provide organic coatings with enhanced anticorrosion performance due to the high aspect ratio and excellent barrier property. As a kind of biocompatible material, the corrosion resistance of hydroxyapatite (HAp) in the biological body leads to its wide application. In this work, ultrathin HAp nanosheets were noncovalently functionalized by situ self-polymerization of dopamine chemistry with an aim to improve their compatibility and dispersibility in epoxy matrix. Electrochemical impedance spectroscopy (EIS) illustrated composited coating exhibited a higher value of impedance at low frequency compared to pure epoxy coating after 50 days of immersion in 3.5 wt% NaCl solution. Local electrochemical impedance spectroscopy (LEIS), spray tests and corrosion products characterization were also carried out to evidence that the modified HAp nanosheets could significantly improve the anti-corrosion performance of epoxy coatings via the enhanced barrier property and corrosion inhibiting effect of polydopamine, which is expected to be widely applied as nano reinforcing fillers in the anticorrosion field.

引用

页数：14

共 76 条

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