Insights into the corrosion mitigation efficacy of modified SiO2/GO-based epoxy composite coatings for aluminum alloy AA6061 in marine applications

IF 2.3 4区 材料科学 Q2 CHEMISTRY, APPLIED
Arshad Ali Khan, Afzal Khan, Zainab Zafar, Ishaq Ahmad
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Abstract

The corrosion protection of aluminum alloys is severely compromised by marine environments, demanding the formulation of efficient protective coatings. Epoxy resin, diglycidyl ether of bisphenol A (DGEBA), and curing agent diethylenetriamine (DETA) were used with the mixing ratio of 100:12 to synthesize functionalized SiO2/GO-based composite coatings and investigate the corrosion protection efficacy for aluminum alloy AA6061 in marine environments. To boost the coatings' barrier and anticorrosive attributes, functionalized silica (FSiO2, with 0, 3, 6, 9, 12, and 15 wt%) and graphene oxide (GO) were jointly incorporated into the DGEBA/DETA epoxy-hardener system for producing composite coatings. The functionalization of silica particles using 3-aminopropyl-triethoxysilane and synthesis of GO was successfully carried out, according to the Fourier transform infrared spectroscopy evidence. The structural properties were investigated by X-ray diffraction. The hydrophobicity tests were conducted for the measurement of the contact angles. The highest static contact angle (126° ± 2) and the lowest contact angle (74° ± 1.5) were recorded for the sample EHS9GO2 and AA6061, respectively, which showed that EHS9GO2 coating had the most hydrophobic behavior. An adhesion test (method B, tape test) was performed on prepared coatings to check the quality of adhesion with the substrate aluminum alloy AA6061. The neat epoxy coating (EHS0GO0) displayed a fair adhesion rating of 3B, while EHS9GO2 coating exhibited excellent adhesion (5B) with substrate AA6061. Furthermore, electrochemical impedance spectroscopy and potentiodynamic polarization tests were employed for assessing the electrochemical behavior and anticorrosion performance of the prepared coatings. It was observed from the Bode plot, that the impedance magnitude/modulus for EHS9GO2 at lower frequencies was the highest as compared to other samples during immersion in the artificial seawater. The bare aluminum alloy substrate AA6061 had the highest corrosion rate of value 0.10483 ± 0.00198 mm/year, due to the direct contact with the electrolyte. Moreover, the highest value of Ecorr (356 ± 0.42 mV) and lowest values of Icorr (0.18 ± 0.03µA), βa (48.7 ± 2 mV/decade), and βc (28.8 ± 1 mV/decade) were witnessed for EHS9GO2 coating, showing significant anticorrosion efficiency against the corrosive electrolyte.

Abstract Image

对改性 SiO2/GO 基环氧复合涂层在海洋应用中缓解铝合金 AA6061 腐蚀效果的深入研究
摘要 铝合金的防腐性能在海洋环境中受到严重影响,因此需要配制高效的保护涂层。采用环氧树脂、双酚 A 二缩水甘油醚(DGEBA)和固化剂二乙烯三胺(DETA),以 100:12 的混合比例合成了功能化 SiO2/GO 基复合涂料,并研究了其在海洋环境中对铝合金 AA6061 的防腐效果。为了提高涂层的阻隔性和防腐性,将功能化二氧化硅(FSiO2,含量分别为 0、3、6、9、12 和 15 wt%)和氧化石墨烯(GO)共同加入到 DGEBA/DETA 环氧固化剂体系中以制备复合涂层。根据傅立叶变换红外光谱证据,使用 3-aminopropyl-triethoxysilane 对二氧化硅颗粒进行了官能化,并成功合成了 GO。通过 X 射线衍射研究了其结构特性。疏水性测试用于测量接触角。EHS9GO2 和 AA6061 样品的静态接触角最高(126° ± 2),接触角最低(74° ± 1.5),这表明 EHS9GO2 涂层具有最强的疏水性。对制备的涂层进行了附着力测试(方法 B,胶带测试),以检查与基材铝合金 AA6061 的附着力质量。纯环氧涂层(EHS0GO0)的附着力一般,为 3B,而 EHS9GO2 涂层与基底 AA6061 的附着力极佳(5B)。此外,还采用了电化学阻抗谱和电位极化测试来评估所制备涂层的电化学行为和防腐性能。从 Bode 图中可以看出,与其他样品相比,EHS9GO2 在人工海水中浸泡时在较低频率下的阻抗幅值/模量最大。由于与电解液直接接触,裸铝合金基板 AA6061 的腐蚀率最高,为 0.10483 ± 0.00198 毫米/年。此外,EHS9GO2 涂层的 Ecorr 值最高(356 ± 0.42 mV),Icorr (0.18 ± 0.03µA)、βa (48.7 ± 2 mV/decade) 和 βc (28.8 ± 1 mV/decade) 值最低,显示出对腐蚀性电解质的显著防腐效果。
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来源期刊
Journal of Coatings Technology and Research
Journal of Coatings Technology and Research 工程技术-材料科学:膜
CiteScore
4.30
自引率
8.70%
发文量
130
审稿时长
2.5 months
期刊介绍: Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.
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