钛酸酯改性硅烷涂层优化及其对5056铝箔耐蚀性能的影响

doi:10.11902/1005.4537.2021.167

中国腐蚀与防护学报

2022, Vol. 42

Issue (3): 378-386 DOI: 10.11902/1005.4537.2021.167

中国腐蚀与防护学会杰出青年学术成就奖论文专栏

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钛酸酯改性硅烷涂层优化及其对5056铝箔耐蚀性能的影响

于帅先¹, 吴亚军¹, 武海生², 吴量¹, 麻彦龙³, 邓盛卫⁴, 孙立东¹(

)

^1.重庆大学材料科学与工程学院重庆 400044
^2.北京卫星制造厂有限公司北京 100094
^3.重庆理工大学材料科学与工程学院重庆 400054
^4.中铝西南铝板带有限公司重庆 401326

Optimization of Titanate Modified Silane Coatings and Their Effect on Corrosion Resistance of 5056 Aluminum Foils

YU Shuaixian¹, WU Yajun¹, WU Haisheng², WU Liang¹, MA Yanlong³, DENG Shengwei⁴, SUN Lidong¹(

)

^1.School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
^2.Beijing Spacecrafts, Beijing 100094, China
^3.School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China
^4.South-West Aluminium Sheets & Strips Co. Ltd. , Chongqing 401326, China

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摘要:

采用钛酸酯改性硅烷偶联剂作为封孔剂，利用浸渍提拉法对5056铝箔阳极氧化膜进行封孔处理，研究了偶联剂溶质配比、浸渍时间、烘干时间和温度对铝箔耐蚀性能的影响，并探讨了钛酸酯对涂层耐蚀性提升的机理。结果表明，经钛酸酯改性硅烷偶联剂封孔后，阳极氧化膜层表面形成了连续致密的复合膜，膜层厚度在铝箔双表面均匀一致；当溶质中Ti∶Si=0.3∶5.7时，复合涂层耐蚀性最优；其重铬酸钾耐蚀点滴时间在19 ℃持续30 min，自腐蚀电流密度低至7.42 nA/cm²，盐雾实验16 d表面出现腐蚀斑点，远高于单一硅烷涂层对应的9 min、1.81×10² nA/cm²、盐雾8 d性能参数。这是由于硅烷/钛酸酯复合涂层形成由钛酸酯框架和硅烷分子填充物所构成的空间网络结构，在多孔膜表面形成致密覆盖层，减缓腐蚀介质渗入，进而促进耐蚀性提升。

关键词 ： 5056铝箔, 阳极氧化, 硅烷/钛酸酯封孔, 耐蚀性

Abstract：

The anodic oxidized 5056 aluminum foil is post sealed with titanate modified silane coupling agent by dip coating method. The effect of solute ratio, dipping duration, drying time and temperature on the foil corrosion resistance is systematically studied. The mechanism related with the enhancement of corrosion resistance induced by the titanate additives is discussed. The results show that a continuous and dense composite film is formed on the surface of anodic coating after sealing with the titanate modified silane coupling agent. The film thickness is uniform on both surfaces of the aluminum foil. The best corrosion resistance is achieved with a composite film formed in the sealing bath with the ratio of Ti to Si=0.3 to 5.7. The coating after sealing exhibits 30 min before the occurrence of coating damage by K₂Cr₂O₇ solution drop testing at 19 ℃, free-corrosion current density of 7.42 nA/cm², and salt spray test up to 16 d, being higher than those of the single silane coating of 9 min, 1.81×10² nA/cm², and 8 d, respectively. This is attributed to the spatial network structure of the composite film formed by the titanate stereo framework and the silane additives. This develops dense film on the anodic coatings to retard the corrosive species, and thus promotes the corrosion resistance.

Key words： 5056 aluminum foil anodic oxidation silane/titanate sealing corrosion resistance

收稿日期: 2021-07-14

ZTFLH:

TG174

基金资助:国家自然科学基金(51871037);重庆英才青年拔尖人才项目(CQYC201905023);国家重点研发计划(2020YFF0421893)

通讯作者: 孙立东 E-mail: lidong.sun@cqu.edu.cn

Corresponding author: SUN Lidong E-mail: lidong.sun@cqu.edu.cn

作者简介: 于帅先，男，1996年生，硕士

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引用本文:

于帅先, 吴亚军, 武海生, 吴量, 麻彦龙, 邓盛卫, 孙立东. 钛酸酯改性硅烷涂层优化及其对5056铝箔耐蚀性能的影响[J]. 中国腐蚀与防护学报, 2022, 42(3): 378-386.
Shuaixian YU, Yajun WU, Haisheng WU, Liang WU, Yanlong MA, Shengwei DENG, Lidong SUN. Optimization of Titanate Modified Silane Coatings and Their Effect on Corrosion Resistance of 5056 Aluminum Foils. Journal of Chinese Society for Corrosion and protection, 2022, 42(3): 378-386.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.167 或 https://www.jcscp.org/CN/Y2022/V42/I3/378

图1 硅烷/钛酸酯溶质总含量、溶质配比与耐蚀性的关系

图2 5056铝箔、阳极氧化膜以及3种不同配比封孔涂层的重铬酸钾点滴实验

图3 硅烷/钛酸酯封孔参数优化

图4 5056铝箔、阳极氧化膜以及2种不同配比硅烷/钛酸酯封孔涂层表面SEM形貌及封孔涂层EDS扫描图

图5 铝箔样品截面SEM形貌图

图6 不同表面状态铝箔样品电化学极化曲线对比

图7 铝箔样品宏观盐雾腐蚀后表面形貌

图8 铝箔封孔涂层及硅烷/钛酸酯不同配比溶液的FTIR图谱

图9 钛酸酯改性硅烷机理示意图

图10 硅烷/钛酸酯溶质配比对耐蚀性的影响

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