缓蚀剂组合的容器负载方式对铝合金涂层耐蚀性能的影响

doi:10.11868/j.issn.1001-4381.2021.000051

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摘要

采用减压吸附和层层自组装技术在介孔二氧化硅纳米颗粒（mesoporous silica nanoparticles，MSN）上同时负载8-羟基喹啉（8-hydroxyquinoline，8-HQ）和苯并三氮唑（1H-benzotriazole，BTA），制备缓蚀剂复合纳米容器（MSN-QB），并将其添加至环氧涂层中从而获得新的涂层（MQB）。利用扫描电镜、透射电镜、傅里叶红外光谱、Zeta电位测试、热重分析等研究缓蚀剂负载前后纳米容器结构的变化和缓蚀剂的刺激响应释放行为，并通过电化学测试和盐雾实验研究层层自组装方式对涂层防护性能的提升。结果表明：MSN-QB中8-HQ和BTA的负载量分别为6.8%（质量分数，下同）和7.1%。MSN-QB具有pH响应特性，8-HQ和BTA在中性条件下释放均受到抑制，在碱性（pH=10）和酸性（pH=4）条件下均可释放，碱性条件下的释放速率更高。MQB涂层具有最佳的耐蚀性能，在3.5% NaCl溶液中浸泡20天后，MQB涂层的低频阻抗值（2.0×10⁹ Ω·cm²）最大，是缓蚀剂单独负载并添加到涂层中的两倍以上。

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	陈高红
	张月
	李应权
	刘建华
	于美

关键词 ：缓蚀剂组合, 负载方式, 层层自组装, 铝合金, 耐蚀性

Abstract：

The composite nanocontainer of corrosion inhibitor (MSN-QB) was prepared by loading octahydroxyquinoline (8-HQ) and benzotriazole (BTA) on mesoporous silica nanoparticles(MSN) simultaneously using vacuum adsorption and layer-by-layer self-assembly technology, and added to the epoxy coating to obtain a new coating (MQB). SEM, TEM, FT-IR, Zeta-potential and TGA were used to study the structure changes of the nanocontainer before and after loading corrosion inhibitors and the stimulus response release behavior of the corrosion inhibitors, and electrochemical test and salt spray test were used to study the improvement of coating protection performance by layer-by-layer self-assembly technique. The results show that the loadings of 8-HQ and BTA in MSN-QB are 6.8%(mass fraction) and 7.1%, respectively. MSN-QB has pH response characteristics. The release of 8-HQ and BTA are both inhibited under neutral conditions, but can be released under alkaline (pH=10) and acidic (pH=4) conditions. The release rate under alkaline conditions is higher. MQB coating has the best corrosion resistance. After immersed in 3.5%NaCl solution 20 d, the MQB coating has the largest|Z|_{0.01 Hz} value(2.0×10⁹ Ω·cm²), more than twice that of MQ+MB coating.

Key words： corrosion inhibitor combination loading method layer-by-layer self-assembly aluminum alloy corrosion resistance

收稿日期: 2021-01-19 出版日期: 2022-02-23

中图分类号:

TG174.4

通讯作者: 于美 E-mail: yumei@buaa.edu.cn

作者简介: 于美(1981-), 女, 教授, 研究方向为材料腐蚀科学与防护技术, 联系地址: 北京市海淀区学院路37号北京航空航天大学材料科学与工程学院(100191), E-mail: yumei@buaa.edu.cn

引用本文:

陈高红, 张月, 李应权, 刘建华, 于美. 缓蚀剂组合的容器负载方式对铝合金涂层耐蚀性能的影响[J]. 材料工程, 2022, 50(2): 153-163.
Gaohong CHEN, Yue ZHANG, Yingquan LI, Jianhua LIU, Mei YU. Effect of container loading method of corrosion inhibitor combination on corrosion resistance of aluminum alloy coating. Journal of Materials Engineering, 2022, 50(2): 153-163.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2021.000051 或 http://jme.biam.ac.cn/CN/Y2022/V50/I2/153

Fig.1 MSN-QB的组装过程及结构示意图

Table 1 添加不同负载方式缓蚀剂的纳米容器的环氧树脂涂层标签

Fig.2 MSN的SEM图(a)和TEM图(b), 氮气吸附/脱附等温线(c)以及孔径分布(d)

Fig.3 MSN-QB的TEM图

Fig.4 不同样品的FT-IR图谱

Fig.5 MSN在负载8-HQ和逐层组装PSS, PEI和BTA过程中的Zeta电位测试

Fig.6 不同样品的热重分析曲线

Fig.7 不同pH条件下MSN-QB中BTA(a)和8-HQ(b)的释放量曲线

Fig.8 涂覆空白涂层(a)和MQB涂层(b)后试样表面的SEM图

Fig.9 MQB涂层截面的SEM图(a)和Si元素分布图(b)

Fig.10 不同涂层与基体的结合力

Fig.11 在添加不同缓蚀剂的0.05 mol/L NaCl溶液中浸泡后试样的动电位极化曲线

Table 2 不同溶液中浸泡1 h后试样动电位极化曲线的拟合结果

Fig.12 涂覆不同涂层的铝合金在3.5%NaCl溶液中浸泡1 h(1)和20 d(2)后的阻抗曲线
(a)Nyquist图；(b)，(c)Bode图

Fig.13 涂覆不同涂层的铝合金在3.5%NaCl溶液浸泡1 h(a)和20 d(b)后的拟合等效电路

Table 3 铝合金在3.5%NaCl溶液浸泡后的EIS等效电路拟合电化学参数

Fig.14 预制划痕的不同涂层在0.05 mol/L NaCl溶液中浸泡9 d的光学照片
(a)空白涂层；(b)M膜层；(c)MQ涂层；(d)MB涂层；(e)MQ+MB涂层；(f)MQB涂层

Fig.15 MQB涂层腐蚀防护机制示意图

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