Investigation of composition and structure for a novel Ti–Zr chemical conversion coating on 6063 aluminum alloy

Zuo, Xunwei; Li, Wenfang; Mu, Songlin; Du, Jun; Yang, Yan; Tang, Peng

doi:10.1016/j.porgcoat.2015.05.008

Cited by 43 publications

(24 citation statements)

References 27 publications

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“…Moreover, it is these cathodic reactions that initiate the formation of conversion film. 8,13,14 When it comes to the coated specimens, the Volta potential maps thus obtained are similar to that of pre-treated aluminum alloys except that the Volta potential difference of the former decreases compared to that of the latter (see Figs. 1c and 1d).…”

Section: Resultssupporting

confidence: 52%

“…That may be related to the formation mechanism of the conversion film. It has been reported in previous literature 8,13,14 that the initiation of formation process is ascribed to the local alkalization in the vicinity of the intermetallics. Consequently, a rise of pH value would promote that initiation by facilitating the local alkalization.…”

Section: Effect Of Ph Of Conversion Solutionmentioning

confidence: 96%

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The formation and corrosion behavior of a zirconium-based conversion coating on the aluminum alloy AA6061

Peng

Yan

et al. 2016

J Coat Technol Res

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To understand the mechanism of the coating formation, the formation process of a zirconiumbased conversion coating on aluminum alloy 6061 has been studied by means of AFM in PeakForce Kelvin Probe Force Microscope (PF-KPFM) mode which could provide direct evidence for the existence of driving force for the film formation. In addition, various techniques including SEM, XPS, EIS, salt spray test, and scanning electrochemical microscope were used to investigate the surface state and corrosion behavior of the conversion film. The direct driving force for the coating formation is the Volta potential difference between the intermetallic particles and matrix. That difference produces an ocean of micro electrochemical cells in which the intermetallic particles act as cathodic sites for the film deposition. However, the precipitation of the layer is a self-limited process in which the driving force gradually decreases as the conversion layer covers the surface of the aluminum alloys. The anti-corrosion performance of the film is unfavorable compared to the conventional chromate conversion coatings due to the pitting corrosion that occurs when exposed to harsh environment containing chloride. Furthermore, the zirconium-based conversion coating possesses no self-healing ability leading to the continuous degradation of the film until it completely lose efficacy.

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Section: Resultssupporting

confidence: 52%

Section: Effect Of Ph Of Conversion Solutionmentioning

confidence: 96%

The formation and corrosion behavior of a zirconium-based conversion coating on the aluminum alloy AA6061

Peng

Yan

et al. 2016

J Coat Technol Res

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“…Compared with the direct formation of HA, tannic acid can induce a more uniform HA coating, which may be attributed to the increase in the number of the centers of HA growth [19,20]. The pores in the HA/TA coating may be caused by hydrogen evolution [23,31]. The cross-section morphologies of the HA, TA, and HA/TA coatings are presented in Figure 1e-g, and the thickness of the coatings are shown in Table 1.…”

Section: Sem Analysis Of the Samplesmentioning

confidence: 99%

“…Therefore, tannic acid is used to prepare coatings to enhance the corrosion resistance of stainless steel in the 19th century and early 20th century [21]. Recently, tannic acid has again attracted attention as a coating for aluminum, aluminum alloys, stainless steel, and magnesium alloys via chemical conversion methods to increase their corrosion resistance [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Hydroxyapatite/Tannic Acid Coating to Enhance the Corrosion Resistance and Cytocompatibility of AZ31 Magnesium Alloys

Zhu

Wang

et al. 2017

Coatings

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Hydroxyapatite/tannic acid coating (HA/TA) were prepared on AZ31 magnesium alloys (AZ31) via chemical conversion and biomimetic methods. The characterization and properties of the coating were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), corrosion testing, MC3T3-E1 cell proliferation assay, and MC3T3-E1 cell morphology observation. The results showed that tannic acid as an inducer increased the number of nucleation centers of hydroxyapatite and rendered the morphology more uniform. Compared to bare AZ31 magnesium (Mg) alloys (E corr = −1.462 ± 0.006 V, I corr = (4.8978 ± 0.2455) × 10 −6 A/cm 2 ), the corrosion current density of the HA/TA-coated magnesium alloys ((5.6494 ± 0.3187) × 10 −8 A/cm 2 ) decreased two orders of magnitude, and the corrosion potential of the HA/TA-coated Mg alloys (E corr = −1.304 ± 0.006 V) increased by about 158 mV. This indicated that the HA/TA coating was effectively protecting the AZ31 against corrosion in simulated body fluid (SBF). Cell proliferation assays and cell morphology observations results showed that the HA/TA coating was not toxic to the MC3T3-E1 cells.

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“…Thus, many researchers devoted to developing environment friendly chemical conversion coatings, such as Ti-Zr based, trivalent chromium, rare earth salt, chromate and molybdate conversion coating. Among these conversion coatings, trivalent chromium conversion coating is one of the most promising alternatives to chromate conversion coating [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Trivalent Chromium Coating on 6063 Aluminum Alloy

Huang¹,

Luo²

2017

dtmse

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Abstract. The trivalent chromium coating was deposited on the surface of 6063 aluminum alloy with Cr 2 (SO 4 ) 3 , H 3 PO 4 and K 2 ZrF 6 . The performances of trivalent chromium conversion coating were analyzed by CuSO4 dropping corrosion test, electrochemical polarization curve, scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDAX). The conversion coating shows gray color and consists of Cr, Zr, K, Al, P, O. The analytical results indicate that the aluminum alloy coated with trivalent chromium exhibits better corrosion resistance than the pure aluminum alloy.

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Investigation of composition and structure for a novel Ti–Zr chemical conversion coating on 6063 aluminum alloy

Cited by 43 publications

References 27 publications

The formation and corrosion behavior of a zirconium-based conversion coating on the aluminum alloy AA6061

The formation and corrosion behavior of a zirconium-based conversion coating on the aluminum alloy AA6061

Preparation of Hydroxyapatite/Tannic Acid Coating to Enhance the Corrosion Resistance and Cytocompatibility of AZ31 Magnesium Alloys

Preparation of Trivalent Chromium Coating on 6063 Aluminum Alloy

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