Preparation and Properties of Chrome-Free Colored Na3AlF6 Conversion Coating on Aluminum Alloy

Yi, Ai Hua; Li, Wen Fang; Du, Jun; Mu, Song

doi:10.4028/www.scientific.net/amr.490-495.3527

Cited by 5 publications

(5 citation statements)

References 12 publications

(12 reference statements)

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“…The immersion of Al foil in Ti/Zr solution for a certain time results in the hydrogen evolution and oxygen reduction reactions like normal micro‐batteries on the surface

Al - {3e}^{- ➝} {Al}^{3 +}

O_{2} + {2H}_{2} normalO + {4e}^{- ➝} {4OH}^{-}

{2H}^{+} + {2e}^{- ➝} H_{2}

…”

Section: Resultsmentioning

confidence: 99%

Preparation and adhesive properties of colored Ti/Zr‐based conversion coating on aluminum foil for lithium battery packaging

Wang

2018

Surface & Interface Analysis

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In this study, an aluminum (Al) foil used for lithium ion battery packaging film was treated with titanium (Ti)/zirconium (Zr) solution containing hexafluorotitanic acid and hexafluorozirconic acid using tannic acid as a colorant and metavanadate as an accelerator, respectively, and a golden conversion coating was successfully deposited on the surface of Al foil. The morphology and composition of the coating were characterized by scanning electron microscopy, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy, and the hydrophilicity was assessed by contact angle measurement. The effect of Ti/Zr treatment on the adhesion properties of Al foil was evaluated by T-peeling test and compared with that of traditional chromate-phosphate treatment. The results show that tannic acid contributes to the formation of the golden coating, and metavanadate accelerates the formation of the conversion coating. The results also indicate that the Ti/Zrbased conversion coating is mainly composed of . The Ti/Zr treatment cannot only improve the heatsealing strength, but also the T-peeling strength by approximately 12 times compared with that of untreated Al foil. Thus, Ti/Zr treatment has the potential to replace the traditional chromate conversion treatment.

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“…The immersion of Al foil in Ti/Zr solution for a certain time results in the hydrogen evolution and oxygen reduction reactions like normal micro‐batteries on the surface

Al - {3e}^{- ➝} {Al}^{3 +}

O_{2} + {2H}_{2} normalO + {4e}^{- ➝} {4OH}^{-}

{2H}^{+} + {2e}^{- ➝} H_{2}

…”

Section: Resultsmentioning

confidence: 99%

Preparation and adhesive properties of colored Ti/Zr‐based conversion coating on aluminum foil for lithium battery packaging

Wang

2018

Surface & Interface Analysis

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“…Three components with binding energies at 530.3, 531.5, and 532.5 eV were curve-fitted from the O-1s spectrum. The first peak at 530.3 eV was caused by V-O binding, the second ascribed to Al 2 O 3 , and the last at 532.5 eV is due to -C-O-or -C O- (Yi et al, 2012;Zuo et al, 2015;Zhu et al, 2016;Zhu et al, 2017). According to these XPS analyses, the VTACC is mainly composed of metal oxides (Al 2 O 3 , V 2 O 3 , VO 2 , and V 2 O 5 ) and metal organic complexes (Al and V-complexes).…”

Section: Xps Analysismentioning

confidence: 97%

“…The photoelectron peak of V-2p was derived from four different oxidation states, with four peaks at 515.6, 515.9, 517.2, and 517.3 eV, assigned to V-complex, V 2 O 3 , V 2 O 5 , and VO 2 (Silversmit et al, 2004;Wu et al, 2004;Zou et al, 2011), respectively. The Al region in the XPS spectrum of Al-2p was composed of two peaks at 72.9 and 74.3 eV, which were attributed Al-complexation compounds and Al 2 O 3 (Yi et al, 2012;Zuo et al, 2015;Zhu et al, 2016;Zhu et al, 2017), respectively. Three components with binding energies at 530.3, 531.5, and 532.5 eV were curve-fitted from the O-1s spectrum.…”

Section: Xps Analysismentioning

confidence: 99%

“…Nevertheless, its utilization has been banned by relevant environmental directives due to hexavalent chromium [Cr (VI)] in the conversion solution and the coating has a wide toxicity to human health and ecological environment (Lay and Levina, 1998;Zhitkovich et al, 2000;Quievryn et al, 2003;Nordberg et al, 2007). As a consequence, various non-chromate conversion coatings have been exploited in the last few decades, including phosphate (Shida et al, 2003;Sheng et al, 2010), molybdate (Huang et al, 2019;Chen and Xu, 2021), rare-earth metal salts (Aziz et al, 2011;Zuo et al, 2014), vanadate (Vega et al, 2011;Niu et al, 2014), and zirconate and/or titanate (Lunder et al, 2004;Guan et al, 2011;Yi et al, 2012;Zuo et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Vanadium and Tannic Acid-Based Composite Conversion Coating for 6063 Aluminum Alloy

et al. 2021

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In this study, a vanadium (V) and tannic acid-based composite conversion coating (VTACC) was prepared on 6063 aluminum alloy (AA6063) to increase its corrosion resistance. The surface morphology and compositions of the VTACCs were characterized using scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and X-ray photoelectron spectroscopy (XPS). The corrosion resistance of the coatings was investigated by linear polarization and electrochemical impedance spectra (EIS). The self-healing ability of the coating was detected by SEM, EDS, and scanning vibrating electrode technique (SVET) measurements. The coating mainly consisted of metal oxides, including Al2O3, VO2, V2O3, and V2O5, and metal organic complexes (Al and V-complexes). The electrochemical measurement results indicated that the best corrosion resistance of VTACC was acquired when the treatment time was 12 min. Furthermore, because a new coating with vanadium rich oxide was developed on the scratch area, artificial scratch VTACC surfaces were repaired after several days of immersion in 3.5-wt% NaCl solution.

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“…However, further investigation of new alternative coatings are still needed. Various chromate-free conversion coatings on aluminum have been developed, such as the ones based on zirconium, titanium, vanadium, cerium, and molybdenum coating as well as hybrid films silane-based coating [2][3][4][5][6][7]. Nevertheless, these coatings are still not as good as chromium when considering its properties.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and Mechanical Behavior of Aluminum Aa2024-T3 Coated With Hybrid Matrix Containing Graphene Oxide

Malfatti¹,

Beltrami²,

Maraschin³

et al. 2019

Tecnol. Metal. Mater. Min.

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The aeronautics industry uses aluminum alloy AA2024-T3 due to its low density and good mechanical properties. However, this alloy requires the use of protective coatings because it does not have the corrosion and wear resistance required by the aeronautics industry. In this context, this work aims at evaluating the performanceof AA2024-T3 aluminum coated with hybrid films containing graphene oxide. The hybrid films were obtained by a dip coating process from a sol composed by tetraethoxysilane/3 (trimethoxysilylpropyl) methacrylate/cerium nitrate/ethanol/water with different concentrations of graphene oxide in suspension. The morphology was evaluated by Scanning Electron Microscopy. The corrosion resistance and wear behavior of the obtained coatings were characterized by open circuit potential, polarization curves and dry wear tests using constant force in a ball-on-plate tribometer. In the studied conditions, the metal coated with hybrid matrix films containing graphene oxide presented no changes in the corrosion resistance, but it showed a positive contribution to the wear resistance.

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Preparation and Properties of Chrome-Free Colored Na3AlF6 Conversion Coating on Aluminum Alloy

Cited by 5 publications

References 12 publications

Preparation and adhesive properties of colored Ti/Zr‐based conversion coating on aluminum foil for lithium battery packaging

Preparation and adhesive properties of colored Ti/Zr‐based conversion coating on aluminum foil for lithium battery packaging

Vanadium and Tannic Acid-Based Composite Conversion Coating for 6063 Aluminum Alloy

Electrochemical and Mechanical Behavior of Aluminum Aa2024-T3 Coated With Hybrid Matrix Containing Graphene Oxide

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