Structural Characterization and Corrosion Properties of BTESPT Silane Films on Surface of 2024-T6 Aluminium Alloy

Chen, Ming An; Xie, Xuan; Xu, Gaohong; Li, Hui Zhong; Zhang, Xin Ming

doi:10.4028/www.scientific.net/msf.546-549.1111

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…Silane molecules have been used to improve the corrosion resistance of substrate metals while also acting as coupling agents . They have emerged as promising alternatives for toxic and carcinogenic hexavalent chromium in the protection of metals particularly Al alloys . Generally, silane molecules are described by the formula: R′‐Si(R3), where R′ is an organofunctional group, that is responsible for the hydrocarbon bond, and R3 is the hydrolysable alkoxy group.…”

Section: Introductionmentioning

confidence: 99%

The effect of surface pretreatment on the corrosion behaviour of silanated AA2198‐T851 Al‐Cu‐Li alloy

Donatus

Klumpp

Mogili

et al. 2018

Surface & Interface Analysis

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The corrosion behaviour of silanated AA2198‐T851 alloy substrates with and with no manufacturing‐process induced near‐surface deformed layer (MPI‐NSDL) has been investigated. Two methods (alkaline etching + desmutting and mechanical polishing) were employed in removing the MPI‐NSDL. Silanization was performed using 2‐bis‐triethoxysilylethane. Electrochemical impedance spectroscopy (EIS), salt spray test, and microscopy techniques were employed in the investigation of the corrosion behaviours. The studies revealed that polishing appeared to be the best silanating pre‐treatment (compared with degreasing and etching + desmutting) for the new generation AA2198‐T851 Al‐Cu‐Li alloy, and this was reflected in the EIS spectra. The etched + desmutted and the degreased surface with MPI‐NSDL did not respond well to silanization and presented more pitting sites per square millimeter. However, the severity of corrosion per pit was more on the polished sample compared with the other two. Also, the corrosion mechanisms were different for the three cases.

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Section: Introductionmentioning

confidence: 99%

The effect of surface pretreatment on the corrosion behaviour of silanated AA2198‐T851 Al‐Cu‐Li alloy

Donatus

Klumpp

Mogili

et al. 2018

Surface & Interface Analysis

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“…Therefore, an number of non-hydrolysed ester groups (OR) will be remained in the silane film. As a consequence, the silane film would be very porous due to lack of sufficient silanol groups in the silane solution According to Zhu24 and the authors’ previous FTIR result on pure BTESPT silane,25 the peak at 518 cm −1 could be ascribed to SiO deformation bending in the organic/inorganic silicates at the interface between the silane film and AZ31 Mg alloy. It should be noted that the hydroxide/oxide on surface of Mg alloy is loose and porous, which makes the silane mix with the hydroxide/oxide.…”

Section: Resultsmentioning

confidence: 99%

“…According to Zhu 24 and the authors' previous FTIR result on pure BTESPT silane, 25 the peak at 518 cm 21 could be ascribed to SiO deformation bending in the organic/inorganic silicates at the interface between the silane film and AZ31 Mg alloy. It should be noted that the hydroxide/oxide on surface of Mg alloy is loose and porous, which makes the silane mix with the hydroxide/ oxide.…”

Section: Ftir Spectrum Analysismentioning

confidence: 94%

Corrosion protection of AZ31 magnesium alloy by silane film of partly hydrolysed BTESPT

Huang

2011

Corrosion Engineering, Science and Technology

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The corrosion protective behaviour of bis-[triethoxysilylpropyl]tetrasulphide (BTESPT) silane film formed by partly hydrolysed BTESPT on AZ31 Mg alloy was investigated. Fourier transform infrared spectroscopy (FTIR) was used for structural characterisation of the silane film. Scanning electron microscope (SEM) and energy dispersive X-ray (EDS) analysis were used for observation of surface morphology and elements analysis of the film. The corrosion behaviours of bare and the silane treated AZ31 Mg alloy in 3?5 wt-%NaCl solution were studied using electrochemical polarisation test, electrochemical impedance spectroscopy (EIS) and immersion test. The results demonstrate that bare AZ31 Mg alloy endures severe corrosion even in NaCl water solution at pH 12, although the corrosion is lighter than that in neutral and acidic NaCl water solution, and that the BTESPT silane film can improve the corrosion protection performances of AZ31 Mg alloy and a lower corrosion rate correlated with higher pH.

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Effect of surface treatments on the localized corrosion resistance of the AA2198‐T8 aluminum lithium alloy welded by FSW process

Machado

Klumpp

Ayusso

et al. 2019

Surface & Interface Analysis

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In this work, the effect of eight types of surface treatments on the corrosion resistance of friction stir welded samples of an AA2198‐T8 Al‐Cu‐Li alloy were tested and compared in an attempt to find suitable alternatives to toxic and carcinogenic hexavalent chromium treatments. All the samples were anodized and subjected to different post‐anodizing treatments. The post‐anodizing treatments were (1) hydrothermal treatment in Ce (NO3)3 6H2O solution; (2) hydrothermal treatment in Ce (NO3)3 6H2O solution with H2O2; (3) hydrothermal treatment in boiling water; (4) hexavalent chromium conversion coating; and (5) immersion in BTSE (bis‐1,2‐(triethoxysilyl) ethane. The corrosion resistance of the treated samples was evaluated by immersion tests in sodium chloride solution (0.1 mol L−1 NaCl) and electrochemical impedance spectroscopy (EIS) of the friction stir weldment. The results showed that among the alternative treatments, the Ce‐containing solutions presented the best corrosion resistance, especially when used without peroxide.

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Structural Characterization and Corrosion Properties of BTESPT Silane Films on Surface of 2024-T6 Aluminium Alloy

Cited by 5 publications

References 12 publications

The effect of surface pretreatment on the corrosion behaviour of silanated AA2198‐T851 Al‐Cu‐Li alloy

The effect of surface pretreatment on the corrosion behaviour of silanated AA2198‐T851 Al‐Cu‐Li alloy

Corrosion protection of AZ31 magnesium alloy by silane film of partly hydrolysed BTESPT

Effect of surface treatments on the localized corrosion resistance of the AA2198‐T8 aluminum lithium alloy welded by FSW process

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