氧化石墨烯改性环氧隔热涂层的耐蚀和隔热性能研究

doi:10.11901/1005.3093.2019.543

材料研究学报

2020, Vol. 34

Issue (5): 345-352 DOI: 10.11901/1005.3093.2019.543

研究论文

本期目录 | 过刊浏览

氧化石墨烯改性环氧隔热涂层的耐蚀和隔热性能研究

梁新磊³, 刘茜¹^,², 王刚³, 王震宇¹, 韩恩厚¹(

), 王帅¹, 易祖耀³, 李娜³

1.中国科学院金属研究所沈阳 110016
2.中国科学技术大学材料科学与工程学院合肥 230026
3.华电郑州机械设计研究院有限公司郑州 450046

Study on Corrosion Resistance and Thermal Insulation Properties of Graphene Oxide Modified Epoxy Thermal Insulation Coating

LIANG Xinlei³, LIU Qian¹^,², WANG Gang³, WANG Zhenyu¹, HAN En-Hou¹(

), WANG Shuai¹, YI Zuyao³, LI Na³

1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2.School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
3.Huadian Zhengzhou Mechanical Design Institute Co. , Ltd, Zhengzhou 450046, China

引用本文:

梁新磊, 刘茜, 王刚, 王震宇, 韩恩厚, 王帅, 易祖耀, 李娜. 氧化石墨烯改性环氧隔热涂层的耐蚀和隔热性能研究[J]. 材料研究学报, 2020, 34(5): 345-352.
Xinlei LIANG, Qian LIU, Gang WANG, Zhenyu WANG, En-Hou HAN, Shuai WANG, Zuyao YI, Na LI. Study on Corrosion Resistance and Thermal Insulation Properties of Graphene Oxide Modified Epoxy Thermal Insulation Coating[J]. Chinese Journal of Materials Research, 2020, 34(5): 345-352.

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摘要:

用氧化石墨烯(GO)浓缩浆分散法制备GO改性环氧隔热涂层，在浓度(质量分数)为3.5% 的NaCl溶液(50℃)中进行腐蚀实验并测试其腐蚀前后的隔热性能。432 h的腐蚀电化学测试结果表明，用0.5%(质量分数) 的GO改性显著提高了涂层低频阻抗，涂层的耐蚀性优于无GO改性和1.0% GO改性的涂层；SEM分析结果表明，用0.5%和1.0% GO改性的隔热涂层腐蚀432 h后表面形貌完好，涂层/基体界面处没有出现裂纹和腐蚀产物，而未经GO改性的涂层出现了明显腐蚀破坏。腐蚀试验前，0.5%、1.0% GO改性的涂层与没有改性的涂层的隔热性能没有明显的区别；腐蚀432 h后涂层对250℃热源分别降温98℃、123℃、115℃，粘结强度分别降低了3.9、1.0、2.3 MPa。实验结果表明，用0.5% GO改性的涂层耐蚀和隔热性能最好。

关键词 ：材料失效与保护, 耐蚀与隔热, 氧化石墨烯改性, 环氧涂层

Abstract：

Graphene oxide (GO) modified epoxy thermal insulation coatings were prepared by adding GO concentrates, then corrosion immersion test in 3.5%NaCl (mass fraction) solution at 50^oC and thermal insulation effect before and after corrosion tests were comparatively measured. Electrochemical analysis shows that the coating modified with 0.5% GO has higher low-frequency resistance than that of coatings with 0% and 1.0% GO. Good surface morphologies were retained for coatings with GO addition after immersion in 3.5% NaCl solution (50^oC) for 432 h. Meanwhile, no obvious cracks and corrosion products were detected on the coating/substrate interface. The coating without GO addition emerges obvious corrosion. The thermal insulation effect to a 250^oC heat source of the above three coatings before corrosion test presents slight differences. Whereas, after 432 h corrosion immersion test the coating with 0% GO, 0.5% GO and 1.0% GO presents quite different in thermal insulation effect with temperature drop as 98^oC, 123^oC and 115^oC for the coated substrate and decrease of bonding strength to the substrate as 3.9 MPa, 1.0 MPa, 2.3 MPa respectively. These results verify that the epoxy coating modified with 0.5% GO has the best corrosion resistance and thermal insulation performance.

Key words： materials failure and protection anti-corrosion and thermal insulation graphene oxide modification epoxy coating

收稿日期: 2019-11-19

ZTFLH:

TG174

作者简介: 梁新磊，男，1976年生，正高级工程师|刘茜，女，1992年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.543 或 https://www.cjmr.org/CN/Y2020/V34/I5/345

图1 测试涂层隔热性能的装置

图2 氧化石墨烯和氧化石墨烯浓缩浆的TEM形貌

图3 涂层在3.5% NaCl溶液(50℃)中浸泡24 h后的Nyquist图和Bode图

图4 涂层在3.5% NaCl溶液(50℃)中浸泡432 h后的Nyquist图和Bode图

图5 用于拟合阻抗结果的等效电路Rs(Qcoat(Rcoat(QdlRct)))

表1 不同涂层在3.5% NaCl溶液(50℃)中浸泡24 h和432 h后的EIS拟合结果

图6 涂层在3.5% NaCl溶液(50℃)中浸泡432 h后的光学照片

图7 涂层在3.5% NaCl溶液(50℃)中浸泡432 h后的SEM表面形貌

图8 涂层在3.5% NaCl溶液(50℃)中浸泡432 h后的横截面形貌

图9 涂层在3.5% NaCl溶液(50℃)中浸泡不同时间后的粘结强度

图10 涂层在3.5% NaCl溶液(50℃)浸泡前的温差-时间隔热曲线

图11 涂层在3.5% NaCl溶液(50℃)中浸泡432 h后的温差-时间隔热曲线

图12 涂层样板在30个冷热循环前后的光学照片

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