Influence of water purity on the corrosion behavior of Mg0.5ZnX (X=Ca, Ge) alloys

Jiang, Pingli; Blawert, Carsten; Scharnagl, Nico; Zheludkevich, Mikhail L.

doi:10.1016/j.corsci.2019.03.044

Cited by 26 publications

(8 citation statements)

References 42 publications

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“…By considering the anodic branches, an extended low-current region appears, revealing that protective Mg(OH)2 corrosion product film is developed on each alloy surface during the immersion. The dense corrosion product film could hinder the anodic dissolution of the alloys [43,44]. In addition, difference between the pitting potential and Ecorr of E3 alloy is almost 100 mV, which is higher than the other alloys.…”

Section: Potentiodynamic Polarization Measurementmentioning

confidence: 95%

Improving the corrosion resistance of MgZn1.2Gd Zr0.18 (x = 0, 0.8, 1.4, 2.0) alloys via Gd additions

et al. 2020

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Effects of Gd addition on microstructure, corrosion behavior and mechanism of cast and extruded MgZn1.2GdxZr0.18 alloys are investigated through microstructure observation, weight loss and electrochemical tests. Increasing Gd from 0 to 2.0 at.%, grains are refined, MgZn2 phase, W-phase and X-phase are formed successively, and basal texture intensity is decreased. The significantly decreased grain size by extrusion and Gd addition induces formation of protective Gd2O3 and MgO layer. The extruded MgZn1.2Gd2.0Zr0.18 alloy shows decreased corrosion rate of 3.72 ± 0.36 mm/year, owing to fine and homogeneous microstructure, dual-role (micro-anode and barrier) of Xphase, compact oxidation layer and basal crystallographic texture.

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Section: Potentiodynamic Polarization Measurementmentioning

confidence: 95%

Improving the corrosion resistance of MgZn1.2Gd Zr0.18 (x = 0, 0.8, 1.4, 2.0) alloys via Gd additions

et al. 2020

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“…Multiple reports refer to a strong corrosion inhibition effect when Ca 2+ is combined with anions that form sparingly soluble precipitates in an alkaline environment, which is immediately (within the first minute of immersion) generated on Mg interface upon contact with aqueous electrolytes. These ions include phosphates (H 2 PO 4 − /HPO 4 2− /PO 4 3− ), carbonates (HCO 3 − and CO 3 2− ), and fluorides, F − [ 24 , 25 , 50 , 55 , 56 ]. Under the presence of Ca 2+ cations, the precipitation of several Ca-containing phases such as hydroxyapatite (Ca 5 (PO 4 ) 3 OH), CaMg(CO 3 ) 2 , and CaCO 3 occurs on magnesium surface, prompted by the alkalinization front due to cathodic HER and ORR.…”

Section: Inorganic Inhibitorsmentioning

confidence: 99%

“…Figure 4 illustrates the formation of the additional layer of CaCO 3 on top of Mg(OH) 2 upon immersing binary Mg0.5Zn or ternary Mg0.5ZnX (0.5Ca or 0.2Ge) alloys in 0.9 wt.% NaCl when tap water was used for solution preparation. In the presence of 59 mg/L calcium at pH 7.48 in tap water, the corrosion resistance of the alloys was improved by almost one order of magnitude, according to the electrochemical test results [ 55 ]. Besides, EIS clearly shows the formation of an additional time constant at high frequencies ascribed to an outer layer containing calcium-carbonate (and often phosphate) species [ 50 , 55 ].…”

Section: Inorganic Inhibitorsmentioning

confidence: 99%

“…In the presence of 59 mg/L calcium at pH 7.48 in tap water, the corrosion resistance of the alloys was improved by almost one order of magnitude, according to the electrochemical test results [ 55 ]. Besides, EIS clearly shows the formation of an additional time constant at high frequencies ascribed to an outer layer containing calcium-carbonate (and often phosphate) species [ 50 , 55 ]. Similar to calcium ions, Sr 2+ , Zn 2+ , and Mn 2+ ions promote precipitation of phosphates on alkaline Mg surface and are used for chemical conversion treatments; see PART I of this review [ 8 ].…”

Section: Inorganic Inhibitorsmentioning

confidence: 99%

“… Schematic presentation of the corrosion processes and formation of corrosion products of binary Mg0.5Zn or ternary Mg0.5ZnX (X = 0.5Ca or 0.2Ge) alloys in 0.9 wt.% NaCl solutions prepared with deionized water and tap water (as source of Ca 2+ and HCO 3− ). Adapted from [ 55 ] with permission from Elsevier. …”

Section: Figurementioning

confidence: 99%

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Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: Part III—Corrosion Inhibitors and Combining Them with Other Protection Strategies

et al. 2022

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Owing to the unique active corrosion protection characteristic of hexavalent chromium-based systems, they have been projected to be highly effective solutions against the corrosion of many engineering metals. However, hexavalent chromium, rendered a highly toxic and carcinogenic substance, is being phased out of industrial applications. Thus, over the past few years, extensive and concerted efforts have been made to develop environmentally friendly alternative technologies with comparable or better corrosion protection performance to that of hexavalent chromium-based technologies. The introduction of corrosion inhibitors to a coating system on magnesium surface is a cost-effective approach not only for improving the overall corrosion protection performance, but also for imparting active inhibition during the service life of the magnesium part. Therefore, in an attempt to resemble the unique active corrosion protection characteristic of the hexavalent chromium-based systems, the incorporation of inhibitors to barrier coatings on magnesium alloys has been extensively investigated. In Part III of the Review, several types of corrosion inhibitors for magnesium and its alloys are reviewed. A discussion of the state-of-the-art inhibitor systems, such as iron-binding inhibitors and inhibitor mixtures, is presented, and perspective directions of research are outlined, including in silico or computational screening of corrosion inhibitors. Finally, the combination of corrosion inhibitors with other corrosion protection strategies is reviewed. Several reported highly protective coatings with active inhibition capabilities stemming from the on-demand activation of incorporated inhibitors can be considered a promising replacement for hexavalent chromium-based technologies, as long as their deployment is adequately addressed.

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Enhanced Corrosion Resistance and Mechanical Properties of Mg-Zn Alloy via Micro-alloying of Ge

Zeng

Jiang

Hou

et al. 2023

JOM

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Influence of water purity on the corrosion behavior of Mg0.5ZnX (X=Ca, Ge) alloys

Cited by 26 publications

References 42 publications

Improving the corrosion resistance of MgZn1.2Gd Zr0.18 (x = 0, 0.8, 1.4, 2.0) alloys via Gd additions

Improving the corrosion resistance of MgZn1.2Gd Zr0.18 (x = 0, 0.8, 1.4, 2.0) alloys via Gd additions

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: Part III—Corrosion Inhibitors and Combining Them with Other Protection Strategies

Enhanced Corrosion Resistance and Mechanical Properties of Mg-Zn Alloy via Micro-alloying of Ge

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