Effect of the electrolyte pH on the corrosion mechanisms of Zn-Mg coated steel

Rodriguez, Justine; Chenoy, Louise; Roobroeck, Aline; Godet, Stéphane; Olivier, Marie‐Georges

doi:10.1016/j.corsci.2016.02.041

Cited by 41 publications

(34 citation statements)

References 40 publications

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“…[1][2][3][4][5][6][7] The enhanced corrosion performance has been investigated in terms of chemical composition, microstructure, and the nature of corrosion products in an effort to understand the origin of the improved corrosion resistance. Chemical composition is very important due to the very different and complementary chemical and electrochemical behavior of the three components as a function of pH.…”

mentioning

confidence: 99%

Editors' Choice—Dealloying of MgZn₂Intermetallic in Slightly Alkaline Chloride Electrolyte and Its Significance in Corrosion Resistance

Han

Ogle

2017

J. Electrochem. Soc.

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The role of dealloying in the corrosion resistance of MgZn 2 has been investigated for the first time. The elemental dissolution kinetics of a synthetic, nominally pure MgZn 2 intermetallic compound was investigated and compared with pure Mg and Zn in 30 mM NaCl with pH = 10.1. Atomic emission spectroelectrochemistry was used to monitor Zn and Mg dissolution as a function of time at open circuit, during linear scan polarization, and at various applied potentials. Zn and Mg displayed a mutual inhibitive effect at open circuit which was explained by the formation of Mg depleted Zn / Zn oxide film. Polarization experiments revealed a Type II dealloying mechanism in which Zn and Mg dissolve simultaneously and congruently above the critical potential, E c , while preferential Mg dissolution dominates below E c . Preferential Mg dissolution leads to the formation of a Mg depleted metallic Zn layer which suppresses further Mg dissolution. In oxygen saturated electrolyte, O 2 reduction was the major cathodic reaction on Zn but was completely inhibited on Mg. The intense cathodic reduction of O 2 on Zn led to a cathodic dissolution of Zn, probably due to the increased interfacial pH.

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confidence: 99%

Editors' Choice—Dealloying of MgZn₂Intermetallic in Slightly Alkaline Chloride Electrolyte and Its Significance in Corrosion Resistance

Han

Ogle

2017

J. Electrochem. Soc.

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“…[1][2][3] The glass pH electrode is a mature routine tool presenting good sensitivity, excellent stability and long life time in pH sensing. However, some of its disadvantages restrict its usage in some particular applications due to the physical nature of the glass membrane.…”

mentioning

confidence: 99%

The Effects of Cyclic Isothermal Oxidation on Ir/IrO_xpH Electrode and a Method to Correct the Potential Drift of Metal Oxide Electrode

Huang¹,

Wan²,

Jin³

et al. 2017

J. Electrochem. Soc.

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The present work demonstrated the effects of isothermal oxidation temperature (750 • C∼870 • C) and water quenching cycle times (1∼3) on properties of IrO x pH electrodes. Property tests of the fabricated electrodes showed that electrodes developed by 800 • C isothermal heating and water quenching for 3 times (H&Q 3) had excellent near Nernst E-pH relationship, relatively faster response rate and the minimum potential drift in long-term stability test. Surface and cross-section morphologies, confocal laser scanning microscopy, electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS) were employed to characterize the electrodes to explore the reason for their excellent properties. Surface morphology showed that the iridium oxide film (IROF) made by H&Q 3 at 800 • C had larger surface roughness, and well-defined homogeneous dense inner layer and loose porous outer layer. Besides, it had the minimum reaction resistance in both acid and alkaline buffers, and contained more effective compositions compared to electrodes fabricated by other conditions. Thus H&Q 3 at 800 • C was suggested to obtain a better integrated pH sensing property. Furthermore, a potential compensation method with a specially designed probe structure was proposed to correct possible errors caused by the potential drift of IrO x pH electrode in long-term pH monitoring. pH, used to reflect the grade of solvents in chemical laboratory since 1909, is an important parameter in many fields such as chemical industry, bio-industry as well as some fundamental research like electrodeposition/electrolysis and corrosion process.1-3 The glass pH electrode is a mature routine tool presenting good sensitivity, excellent stability and long life time in pH sensing. However, some of its disadvantages restrict its usage in some particular applications due to the physical nature of the glass membrane.The alternative pH electrodes include ion-sensitive field-effect transistor (ISFET) pH sensors, 4,5 optical fiber pH sensors, 6,7 hydrogel film pH sensors, [8][9][10][11][12] metal/metal oxide sensors, 13-16 etc. By comparing sensitivity, Nernst response range, ion selectivity, interference of oxidation, the iridium oxide pH electrode has been demonstrated to be the most promising one among all kinds of pH sensors. [17][18][19] The reported fabrication approaches of IrO x pH electrode include electrochemical cyclic voltammetry (CV), 19-22 electrodeposition, 23-25 radio frequency (RF) magnetron sputtering deposition, 26-30 and thermal oxidation.14,31 Among which, the electrode produced by thermal oxidation exhibited excellent overall performance, including wide E-pH relationship range, fast response time and long term stability.32-36 Wang et al. developed carbonate melt oxidation to coat Ir through the oxidation of Ir wires in a carbonate melt at 870• C for 5 hours.31 Hitchman et al. produced IrO x -electrodes by direct thermal oxidation in air at 800• C. 34 Both surface films of fabricated by the above conditions showed obvious cracks...

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“…It is widely believed [25][26][27][28] that the effect of enhanced anticorrosion protection for Al/Mg-doped (e.g., Magnelis®) Zn layers (also, refer to the reported resistance parameters in Tables 3 and 4), as compared to that exhibited solely by the zinc coating, is related to the surface formation of complex, mixed (Mg/Al) hydroxy carbonate precipitates. These compact films could then provide superior protection to the background material, also by tightly filling local cavities within the coating.…”

Section: Electrochemical Corrosion Characteristics Of Zn(magnelis®)-cmentioning

confidence: 99%

“…On the other hand, the presence of Mg and Al additives within Magnelis® coating primarily (except for some more complex molecules, such as pure and mixed hydroxy carbonates) leads to the formation of hydroxide compounds (Eqs. 3 and 4) [16,25,[27][28][29]:…”

Section: Electrochemical Corrosion Characteristics Of Zn(magnelis®)-cmentioning

confidence: 99%

“…However, in the presence of chloride ions and dissolved CO 2 , the formation of other zinc products, including hydrozincite: Zn 5 (CO 3 ) 2 (OH) 6 and simonkolleite: Zn 5 (OH) 8 Cl 2 , has widely been indicated [14,16,17,[25][26][27][28]. On the other hand, the presence of Mg and Al additives within Magnelis® coating primarily (except for some more complex molecules, such as pure and mixed hydroxy carbonates) leads to the formation of hydroxide compounds (Eqs.…”

Section: Electrochemical Corrosion Characteristics Of Zn(magnelis®)-cmentioning

confidence: 99%

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On the Corrosion Performance of Module-Mounting Assemblies for Ground-Mounted Photovoltaic Power Station

Pierożyński

Bialy²

2017

Electrocatalysis

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The present paper reports the corrosion performance results of construction materials employed for the manufacture of mounting assemblies for ground-mounted photovoltaic (PV) power stations. For this purpose, the corrosion behavior of industrial hot-dip Zn-coated steel sheets was compared with that of Magnelis® type steel coating. Experiments involved samples in continuous exposure in 3 wt% NaCl solution along with regular assessment of their corrosion parameters by means of major (impedance spectroscopy, linear and Tafel polarization plots) electrochemical techniques. Analyses of surface/cross-sectional morphology and elemental compositions of metal-coated samples were carried out by means of SEM and EDX spectroscopy techniques.

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Effect of the electrolyte pH on the corrosion mechanisms of Zn-Mg coated steel

Cited by 41 publications

References 40 publications

Editors' Choice—Dealloying of MgZn₂Intermetallic in Slightly Alkaline Chloride Electrolyte and Its Significance in Corrosion Resistance

Editors' Choice—Dealloying of MgZn₂Intermetallic in Slightly Alkaline Chloride Electrolyte and Its Significance in Corrosion Resistance

The Effects of Cyclic Isothermal Oxidation on Ir/IrO_xpH Electrode and a Method to Correct the Potential Drift of Metal Oxide Electrode

On the Corrosion Performance of Module-Mounting Assemblies for Ground-Mounted Photovoltaic Power Station

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Effect of the electrolyte pH on the corrosion mechanisms of Zn-Mg coated steel

Cited by 41 publications

References 40 publications

Editors' Choice—Dealloying of MgZn2Intermetallic in Slightly Alkaline Chloride Electrolyte and Its Significance in Corrosion Resistance

Editors' Choice—Dealloying of MgZn2Intermetallic in Slightly Alkaline Chloride Electrolyte and Its Significance in Corrosion Resistance

The Effects of Cyclic Isothermal Oxidation on Ir/IrOxpH Electrode and a Method to Correct the Potential Drift of Metal Oxide Electrode

On the Corrosion Performance of Module-Mounting Assemblies for Ground-Mounted Photovoltaic Power Station

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Editors' Choice—Dealloying of MgZn₂Intermetallic in Slightly Alkaline Chloride Electrolyte and Its Significance in Corrosion Resistance

Editors' Choice—Dealloying of MgZn₂Intermetallic in Slightly Alkaline Chloride Electrolyte and Its Significance in Corrosion Resistance

The Effects of Cyclic Isothermal Oxidation on Ir/IrO_xpH Electrode and a Method to Correct the Potential Drift of Metal Oxide Electrode