Influence of Zr and Be on microstructure and electrochemical behavior of AZ63 anode

Jafari, Hassan; Hassanizadeh, Behrouz Mohammad

doi:10.1002/maco.201810514

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…The samples (10 mm × 10 mm × 6 mm) of die-cast WA42 magnesium alloy (nominally 4-wt% Y and 2-wt% Al with the balance Mg) were used in this study. Before conversion treatment, the samples were ground with SiC papers from P400 to P2000 and then washed in alkaline solution (40-g/dm 3 NaOH and 10-g/dm 3 Na 3 PO 4 ) at 60°C for 5 min and subsequently in acid solution (0.25-wt% HF and 0.25-wt% HCl) at room temperature for 5 s. Between every step, the sample surface should be washed with flowing deionized water.…”

Section: Materials Preparation and Conversion Coating Treatmentmentioning

confidence: 99%

“…[ 1,2 ] However, their relatively weak corrosion and poor mechanical properties are the main issues that hamper their widespread usage. [ 3,4 ] Although substantial advancements, such as alloying with rare‐earth (RE) elements, have been accomplished to improve the mechanical properties of Mg alloys, [ 5,6 ] the poor aqueous and galvanic corrosion resistance is still a threat. Thus, a proper surface treatment procedure is required to effectively protect the Mg alloys from corrosion.…”

Section: Introductionmentioning

confidence: 99%

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Designing for the cerium‐based conversion coating with excellent corrosion resistance on Mg–4Y–2Al magnesium alloy

Liu

et al. 2020

Materials & Corrosion

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The cerium salt chemical conversion baths containing KMnO4 are applied to prepare protective coatings on the WA42 alloy surface, and the effect of the concentration of KMnO4 on the microstructure and corrosion properties of the coatings is investigated by scanning electron microscopy, X‐ray photoelectron spectroscopy, and electrochemical tests. The results indicate that with the addition of KMnO4 to the conversion bath, the microstructure of the coating is more uniform and denser, and the coating with the KMnO4 concentration of 4 g/L (4M coating) has the most uniform microstructure with the least microcracks. The 4M coating exhibits a two‐layered structure, and it is mainly composed of MgO, Mg(OH)2, CeO2, Ce2O3, Ce(OH)3, MnO, and MnO2. In addition, as the KMnO4 concentration increases from 0 to 6 g/L, the Icorr of the coatings in 3.5% NaCl solution decreases first and then increases, and the 4M coating shows the best corrosion resistance, which should attribute to the uniform and dense microstructure.

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Section: Materials Preparation and Conversion Coating Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Designing for the cerium‐based conversion coating with excellent corrosion resistance on Mg–4Y–2Al magnesium alloy

Liu

et al. 2020

Materials & Corrosion

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“…Magnesium (Mg) sacrificial anodes are widely used to protect buried metal pipelines, reinforced concrete structures, and other steel structures, due to their inherent negative potential, large driving voltage, and large current output per unit weight [1][2][3][4]. The current commercial use of magnesium alloy sacrificial anode is mainly focused on casting AZ63, as it has uniform surface dissolution and high current efficiency [5][6][7]. In order to facilitate the connection between AZ63 sacrificial anode and protected pipelines or steel structure, when casting AZ63 sacrificial anode, Q235 rod is first placed in the mold, and then the solid-liquid interface is combined to form a wiring terminal.…”

Section: Introductionmentioning

confidence: 99%

Effect of Q235 Hot-Dip Galvanized and Post-Casting T6 Heat Treatment on Microstructure and Mechanical Properties of Interfacial between AZ63 and Q235 by Solid-Liquid Compound Casting

Dai

Xie

Zhou

et al. 2022

Metals

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AZ63 sacrificial anode is widely used to protect buried metal pipelines and reinforced concrete structures and so on. The interfacial metallurgical bonding between AZ63 sacrificial anode and Q235 wiring terminal directly affects its cathodic protection performance. Therefore, microstructure and mechanical properties of interfacial between AZ63 and Q235 by solid–liquid compound casting with hot-dip galvanized and post-casting solution-aging treatment (T6) were investigated. The results indicate that hot-dip galvanizing on the surface of Q235 is beneficial to the formation of intermetallic compounds at the interface. At the same time, it can promote the metallurgical bonding of the interface between AZ63 and Q235. After T6 heat treatment, the intermetallic compound at the interface between AZ63 and galvanized Q235 was refined. The electron-probe microanalyzer (EPMA) revealed that the intermetallic compounds at the interfaces between AZ63 and galvanized Q235 were Fe2Al5 before and after T6 treatment. Push-out testing and microhardness were used to investigate the mechanical properties of interface between AZ63 and Q235. It is shown that the hot-dip galvanization of the Q235 surface and T6 treatment were beneficial to improve the metallurgical bonding shear strength and microhardness of the interface. After T6 heat treatment, the highest shear strength at the interface between AZ63 and galvanized Q235 was up to 31.9 ± 1.9 MPa.

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Effects of Al content on the corrosion properties of Mg–4Y–xAl alloys

Liu

et al. 2020

Materials & Corrosion

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The corrosion performances of Mg–4Y–xAl (x = 1, 2, 3, and 4 wt%) alloys in the 3.5% NaCl electrolyte solution are investigated by electrochemical tests, weight loss measurement and corrosion morphology observation. The results indicate that corrosion modes for the alloys are localized corrosion and the filiform type of attack. With Al concentration increasing from 1 to 4 wt%, the corrosion rate of Mg–4Y–xAl alloys decreases firstly and then increases, and WA42 alloy shows the best corrosion resistance. The addition of Al element to Mg–4Y alloys leads to the formation of Al2Y and Al11Y3 intermetallic compounds and reduces the proportion of Mg24Y5 phase. Corrosion resistance of the Mg–4Y–xAl alloys mainly depends on the size and distribution of the second phases. Besides, the addition of excessive Al can greatly consumes the Y element in the matrix, thus leading to a less protective film on the alloys. The effect of the relative Volta potential changes between the second phases and α‐Mg on corrosion resistance of Mg–4Y–xAl alloys is insignificant. The main corrosion products of the Mg–4Y–xAl alloys are Mg(OH)2, Mg3(OH)5Cl·4H2O, Mg0.72Al0.28(CO3)0.15(OH)1.98(H2O)0.48, and Mg4Al2(OH)12CO3·3H2O.

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Influence of Zr and Be on microstructure and electrochemical behavior of AZ63 anode

Cited by 5 publications

References 21 publications

Designing for the cerium‐based conversion coating with excellent corrosion resistance on Mg–4Y–2Al magnesium alloy

Designing for the cerium‐based conversion coating with excellent corrosion resistance on Mg–4Y–2Al magnesium alloy

Effect of Q235 Hot-Dip Galvanized and Post-Casting T6 Heat Treatment on Microstructure and Mechanical Properties of Interfacial between AZ63 and Q235 by Solid-Liquid Compound Casting

Effects of Al content on the corrosion properties of Mg–4Y–xAl alloys

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