A sol–bath–gel approach to prepare hybrid coating for corrosion protection of aluminum alloy

Li, Lingjie; He, Jie; Lei, Jinglei; Xu, Wenting; Jing, Xiping; Ou, Xiaotong; Wu, Shengmao; Li, Nianbing; Zhang, Shengtao

doi:10.1016/j.surfcoat.2015.08.032

Cited by 37 publications

(8 citation statements)

References 52 publications

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“…It is interesting to observe that the results obtained in our work well compare with recently published experimental values of CCD on aluminum substrates obtained by the application of different anticorrosive organic or hybrid coatings. − …”

Section: Resultssupporting

confidence: 85%

Lignin-Based Anticorrosion Coatings for the Protection of Aluminum Surfaces

Haro

Magagnin

Turri

et al. 2019

ACS Sustainable Chem. Eng.

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New renewable lignin-based coatings with anticorrosion properties are presented in this work. These materials are based on the silanization of a tetrahydrofuran (THF) soluble fraction of a technical softwood kraft lignin through urethane linkages and its subsequent thermal cross-linking on metallic substrates using different cross-linking promoters. Spectroscopy analyses confirmed silanization of lignin meanwhile the thermal analyses indicated an increase of the glass transition temperature and the thermal stability after the functionalization process. The silanized (LF-S) and nonsilanized (LF) lignins were used as main materials for the preparation of thermally cross-linked coatings in the presence of different promoters, namely tetraethyl orthosilicate (TEOS) as a cocrosslinker and/or acetic acid (AcH) as a catalyst. The coatings prepared from LF-S presented improved thermal stability and hydrophobic character compared with those obtained from unmodified LF. Moreover, the adhesion strength of the coatings on aluminum increased when the cross-linker promoters were incorporated to the coating formulation. Finally, the corrosion inhibition effect of these coatings was assessed through the evaluation of the corrosion current density on aluminum, finding important improvements on the electrochemical stability of the metal. The results of this study clearly demonstrate a straightforward approach for the production of high-lignin-content coatings that may find direct industrial application in the field of corrosion prevention for metals.

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Section: Resultssupporting

confidence: 85%

Lignin-Based Anticorrosion Coatings for the Protection of Aluminum Surfaces

Haro

Magagnin

Turri

et al. 2019

ACS Sustainable Chem. Eng.

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“…Also, the capacitance of the double layer (represented by the constant phase element) and the charge transfer resistance, CPE dl , R ct , are placed in series with CPE ox and R ox . This circuit is consistent with other reports in the literature 2,23,24 for Al alloys. The impedance spectra were fitted to this circuit for both alloys with a very good correlation with χ 2 on the order of 10 -4 ( Table 2).…”

Section: Electrochemical Impedance Spectroscopy Analysissupporting

confidence: 93%

“…The CPE ox values are related to the high frequency range and are associated with the oxide layer exposed to the corrosive medium. Oxide capacitance is attributed to the ion transport through the oxide layer 23 . The impedance of the passive layer (R ox ) of the HPT-processed alloy is one order of magnitude higher than the oxide layer on the surface of the solution-treated Al alloy.…”

Section: Solution Treated Hptmentioning

confidence: 99%

Effect of High-pressure Torsion on Corrosion Behavior of a Solution-treated Al-Mg-Sc Alloy in a Saline Solution

et al. 2019

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The effect of the increase in crystalline defects in the structure generated by high-pressure torsion (HPT) on the corrosion behavior of metallic materials is not well understood. This report evaluates the influence of HPT on the corrosion behavior of a solution treated Al-3wt% Mg-0.2wt% Sc alloy in a 3.5 wt./v.% NaCl solution. The electrochemical behavior of the alloy was evaluated using cyclic polarization, electrochemical impedance spectroscopy (EIS), Mott Schottky, X-ray photoelectron spectroscopy, and chronoamperometry testing. The passive current density decreased after HPT processing, indicating a more protective oxide layer was formed on the surface of the HPT-processed alloy. Mott Schottky analysis confirmed the higher protection efficiency of the passive layer on the HPT-processed alloy. The film formed in the solution-treated alloy was a p-type and an n-type semiconductor while the alloy processed by HPT exhibited only an n-type semiconductor behavior. EIS showed that corrosion resistance in a saline medium increased with HPT processing.

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“…As shown in Figure 22f, the contents of N−C=O and C−C/C−H/C=C increased while those of N−C−O and C−N decreasedafter exposure for 20 years. This might have occurred because of the small number of amino radicals forming on the surface cross-link with other groups to produce new functional groups, owing to the post-curing effect of the epoxy coatings[54,55]. The soluble or volatile debris generated by the aging of the epoxy coatings flowed outside the surface, releasing internal stress, and increasing osmotic pressure; thus, the surface of epoxy coating became more convex and fold[34,56].…”

mentioning

confidence: 99%

Long-Term Atmospheric Aging and Corrosion of Epoxy Primer-Coated Aluminum Alloy in Coastal Environments

Zhang

et al. 2021

Coatings

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Aircraft are subjected to extreme weather conditions in coastal areas. This study reports long-term atmospheric exposure tests carried out on an epoxy primer-coated aluminum alloy in a coastal environment for 7, 12, and 20 years. The micromorphology and characteristics of the section and surface, the products of corrosion, electrochemical impedance, and molecular structure of the coated specimens were examined through a spectrophotometer, scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectrometer (XPS). The results showed that the angles of contact of the specimens with different numbers of years of atmospheric exposure satisfied the normal distribution. Their fractal dimensions increased with an increase in the duration of exposure. Intergranular corrosion and exfoliation corrosion appeared in the specimens after 20 years, where the product of corrosion was Al(OH)3. The impedances and thermal properties of the epoxy coatings were influenced by the synergistic effects of aging and post-curing. The impedances of the coatings decreased greatly after long-term atmospheric exposure. After 20 years of corrosion, the specimen showed the characteristics of the substrate being corroded. The mechanism of corrosion and the electrochemical equivalent circuit were also analyzed.

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A sol–bath–gel approach to prepare hybrid coating for corrosion protection of aluminum alloy

Cited by 37 publications

References 52 publications

Lignin-Based Anticorrosion Coatings for the Protection of Aluminum Surfaces

Lignin-Based Anticorrosion Coatings for the Protection of Aluminum Surfaces

Effect of High-pressure Torsion on Corrosion Behavior of a Solution-treated Al-Mg-Sc Alloy in a Saline Solution

Long-Term Atmospheric Aging and Corrosion of Epoxy Primer-Coated Aluminum Alloy in Coastal Environments

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