Effect of phosphate–silane pretreatment on the corrosion resistance and adhesive-bonded performance of the AZ31 magnesium alloys

Yue, Yuanyuan; Liu, Zhongxia; Wan, Tingting; Wang, Pei-Chung

doi:10.1016/j.porgcoat.2013.01.010

Cited by 43 publications

(21 citation statements)

References 37 publications

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“…It is well known that EIS is considered as one of the most valuable electrochemical methods to investigate the corrosion resistance of coated metals [8,42]. EIS plots of coated and bare magnesium alloys in 0.1 molÁL -1 NaCl neutral buffered solution were also measured (Fig.…”

Section: Electrochemical Behavior Of Coated and Bare Magnesium Alloysmentioning

confidence: 99%

“…The best parameter that represents the corrosion resistance is the polarization resistance (R p ); it can be expressed with R c and R t while the angular frequency (x) is close to zero by the formula [8,46]:…”

Section: Electrochemical Behavior Of Coated and Bare Magnesium Alloysmentioning

confidence: 99%

“…However, the high chemical activity and the low corrosion resistance of magnesium alloy limit their wildly applications [6][7][8]. A popular concept is that its high reactivity causes corrosion damage, but it does not take into account the nature of the problem.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical behaviors of magnesium alloy with phosphate conversion coating in NaCl solutions

Dong

et al. 2016

Rare Met.

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A composite conversion coating was prepared on magnesium alloy by the only one-step immersion treatment. The characteristics of the conversion coating were investigated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results indicate that the composite conversion coating consists of magnesium hydroxide, magnesium phosphate and manganese phosphate. The electrochemical behavior of the conversion coating was investigated systematically by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurement in different NaCl solutions. Polarization measurements and EIS results reveal that the magnesium alloy with the conversion coating have better corrosion resistance compared to the bare magnesium alloy in these conditions. And the corrosion rate of the magnesium alloy with conversion coating increases consistently with the chloride ion concentration. In alkaline conditions, the magnesium alloy with conversion coating has superior corrosion resistance by the synergistic effects between Mg(OH) 2 film and conversion coating. Moreover, the electrochemical corrosion mechanism of the magnesium alloy was analyzed with respect to the conversion coating in a Cl -containing environment.

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Section: Electrochemical Behavior Of Coated and Bare Magnesium Alloysmentioning

confidence: 99%

Section: Electrochemical Behavior Of Coated and Bare Magnesium Alloysmentioning

confidence: 99%

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Electrochemical behaviors of magnesium alloy with phosphate conversion coating in NaCl solutions

Dong

et al. 2016

Rare Met.

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“…[11,33] As the magnesium alloy was immersed into NaCl solution, Mg (OH) 2 film firstly formed due to the lower standard thermodynamic value DH f (À924:66 kJ mol À1 for Mg(OH) 2 and −641.62 kJ mol −1 for MgCl 2 ) on the fresh surface of magnesium alloy to protect it from further corrosion. The formation of Mg (OH) 2 leaded to evolution of hydrogen.…”

Section: Immersion Testmentioning

confidence: 99%

“…[7,11] For environmental protection reasons, many surface treatments have been found to take the place of chromate containing surface treatment processes, such as cold spray coating, [12,13] electrodeposition of aluminum in ionic liquid, [14,15] PVD (physical vapor deposition) coating, [16] phosphate conversion coating [17,18], or polymer/ organic coatings. [11,19,20] Polymer/organic coatings, which are also called organic finishing's, are considered to be the most cost-effective treatments among the abovementioned techniques [20] and are commonly used in the final stage of a coating treatment on every kind of substrate. [21,22] The most important issue of organic coating is to find an adequate surface pretreatment process which is the decisive factor in the adhesion strength between an organic film and an inorganic substrate, and the time of failure of the protection during the immersion test.…”

Section: Introductionmentioning

confidence: 99%

Effect of phosphate surface pretreatment on corrosion resistance and adhesion of PI coating on Mg-5 wt.% Sn alloy

Lee¹,

Huang²,

Liu³

et al. 2015

Journal of Adhesion Science and Technology

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In this study, phosphate surface pretreatment (PSPT) and poly[pyromellitic dianhydride-co-4,4ʹ-oxydianiline] polyimide (PMDA-ODA PI) coating were used to provide corrosion protection for Mg-5 wt.% Sn alloy. PSPT enhanced the adhesion of PI coating by mechanical interlocking and chemical anchoring. Surface roughness was increased and provided stronger mechanical interlocking. Phosphates were formed on the alloy surface to act as anchor groups. Energy dispersive X-ray spectrometer and X-ray photoelectron spectroscopy results indicated that bonds formed between anchor groups and PI coating. The bonds provided chemical anchoring and enhanced the adhesion of PI coating. The increase of corrosion resistance of PI coating on Mg-5 wt.% Sn alloy (E corr = −0.86 V/SCE, I corr ¼ 4:9 Â 10 À2 µA cm −2 and corrosion rate far less than 0:1 ml cm À2 day À1 Þ showed the bonds were stable enough to stand the attack of electrolyte and inhibit the electrochemical reaction at the interface. IntroductionMagnesium alloys possess enormous advantages for high-performance automotive applications due to their superior properties such as low density, high specific mechanical strength, good heat conductivity, and good damping capacity. [1,2] Besides, the low density of magnesium alloy also satisfies the increasing demand for high energy efficiency in the automobile industry. Nowadays, most commercial uses of magnesium alloy are based on the well-developed Mg-Al system alloys. With the increasing needs of applications at elevated temperatures, Mg-Sn system alloys may take the place of Mg-Al system to be used due to its better mechanical properties at elevated temperature. [3,4] However, the better mechanical properties of Mg-Sn system at elevated temperature are not enough to replace Mg-Al system to be used as commercialized magnesium alloy. It is well known that poor corrosion resistance is the major barrier to hinder the industrialization of magnesium alloy. Besides, the lack of aluminum which forms Al 2 O 3 to protect the substrate from corrosion [5] in Mg-Sn system makes corrosion resistance of Mg-Sn system much worse than that of Mg-Al system.[6] Therefore,

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Corrosion protection investigations of oxide‐silane composite coating on hot dip aluminized steel

Liu,

Shi,

Jiang

et al. 2024

Materials & Corrosion

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The hot dip aluminized ASTM 1035 steels (Al‐coated steel) underwent anodic oxidization, and various thicknesses of Al2O3 coating were applied to the surface of the Al‐coated steels (Al–Al2O3‐coated steel). The corrosion resistance of the Al–Al2O3‐coated steel was investigated using potentiodynamic tests, electrochemical impedance spectroscopy tests and measurement of galvanic current density in a bimetallic cell. It was found that the anodic oxidation resulted in the formation of a porous Al2O3 coating on the surface of the Al‐coated steel, improving both its corrosion resistance and galvanic corrosion resistance when coupled with carbon fiber reinforced nylon 6 composite (Cf/PA6). Silane treatment effectively sealed the pores within the Al2O3 coating, resulting in improved corrosion protection for Al–Al2O3‐coated steel due to the exceptional insulation, impermeability and hydrophobic properties of silane coating. Compared to the Al‐coated steel/carbon fiber reinforced polymer (CFRP) couple and Al–Al2O3‐coated steel/CFRP couple, stable galvanic current density decreased by approximately 75% and 45%, respectively.

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Effect of phosphate–silane pretreatment on the corrosion resistance and adhesive-bonded performance of the AZ31 magnesium alloys

Cited by 43 publications

References 37 publications

Electrochemical behaviors of magnesium alloy with phosphate conversion coating in NaCl solutions

Electrochemical behaviors of magnesium alloy with phosphate conversion coating in NaCl solutions

Effect of phosphate surface pretreatment on corrosion resistance and adhesion of PI coating on Mg-5 wt.% Sn alloy

Corrosion protection investigations of oxide‐silane composite coating on hot dip aluminized steel

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