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

doi:10.11902/1005.4537.2021.167

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

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

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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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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

Received: 14 July 2021

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51871037);Chongqing Youth Talents Program(CQYC201905023);National Key Research and Development Program of China(2020YFF0421893)

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

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

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	Shuaixian YU
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	Shengwei DENG
	Lidong SUN

Cite this article:

YU Shuaixian, WU Yajun, WU Haisheng, WU Liang, MA Yanlong, DENG Shengwei, SUN Lidong. 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.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.167 OR https://www.jcscp.org/EN/Y2022/V42/I3/378

Fig.1 Effects of total solute content and silane/titanate volume ratio in the solutions on corrosion resistance

Fig.2 Drop tests of potassium dichromate solution for 5056 aluminum foil (a), anodic oxide film (b), Ti:Si=0.5:2.5 sealing coating (c), Ti:Si=0.3:5.7 sealing coating (d) and Ti:Si=1:9 sealing coating (e)

Fig.3 Optimizations of immersion time (a), drying time (b) and drying temperature (c) for silane/titaniate sealing coating

Fig.4 SEM surface morphologies of 5056 aluminum foil (a), anodic oxide film (b), silane sealing coating (total solute content: 6%) (c) and silane/titanate sealing coating (total solute content: 6%, Ti:Si=0.3:5.7) (d) and EDS mappings of Si and Ti on the surface of silane/titanate sealing coating (e, f)

Fig.5 SEM cross-sectional morphologies of aluminum foil with silane sealing coating (a) and silane/titanate sealing coating (Ti:Si=0.3:5.7) (b)

Fig.6 Comparison of electrochemical polarization curves of aluminum foil without and with sealing coatings

Fig.7 Photographs of various samples after salt spray tests for different durations: (a) 5056 aluminum foil, (b) anodic oxide film, (c) silane sealing coating (total solute content: 6%) and (d) silane/titanate sealing coating (total solute content: 6%, Ti:Si=0.3:5.7)

Fig.8 FTIR spectra of two sealing coatings on aluminum foil (a) and silane/titanate solutions with different Ti:Si ratios (Note: the ratio is normalized to the Ti content) (b)

Fig.9 Schematic diagram of modification mechanism of silane coating by adding titanate

Fig.10 Effect of silane/titanate solute ratio (Note: the ratio is normalized to the Ti content) on corrosion resistance (Data are from Fig.1)

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