Improved corrosion resistance of ZrO2/MgO coating for magnesium alloys by manipulating the pore structure

Li, Jing; Zhang, Zhen; Guo, Ziwei; Yang, Zehui; Qian, Weixing; Chen, Yongnan; Li, Hongzhan; Zhao, Qinyang; Xing, Ya-Zhe; Zhao, Yongqing

doi:10.1016/j.jmrt.2023.03.159

Cited by 14 publications

(4 citation statements)

References 53 publications

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“…At the same time, in [27,28], it was suggested that when ZrO 2 ceramics transition to the tetragonal or cubic phase, the rate of accumulation of radiation damage decreases due to structural changes associated with polymorphic transformations [29][30][31]. The results of increased stability to radiation swelling and destructive changes in strength and thermophysical parameters due to increased dopant concentrations in the ceramic composition and the formation of interphase boundaries (at high concentrations) also have good agreement with the results of [32,33]. This strengthening is based on the following hypothesis: an increase in the contribution of interphase boundaries increases resistance to radiation damage by creating additional obstacles to the migration processes of point and vacancy defects, which reduces the likelihood of their agglomeration.…”

Section: Resultssupporting

confidence: 57%

Study of the Effect of Variation in the Phase Composition of ZrO2/MgO Ceramics on the Resistance to Radiation Damage during Irradiation with Kr15+ Ions

Kurakhmedov,

Morzabayev,

Uglov

et al. 2023

J. Compos. Sci.

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Interest in the modification of zirconium-containing ceramics is rooted in their great prospects for application as materials for creating inert matrices of dispersed nuclear fuel, which can replace traditional fuel containing uranium dioxide, as well as increase the degree of its burnup. Moreover, among the variety of different types of ceramics offered, zirconium dioxide is the most promising, since it has higher thermal conductivity values compared to other types of ceramics, as well as low volumetric thermal expansion. Moreover, the key limitations in the application of these types of ceramics as materials for creating inert matrices are polymorphic transformations, which have a negative impact on changes in the properties of ceramics under external influences. The evaluation results of the impact of change in the ZrO2 ceramics’ phase composition on the radiation damage resistance when subjected to irradiation with heavy ions, comparable in energy to fission fragments, are presented. The objects of study were samples of ZrO2 ceramics doped with MgO, the variation in the concentration of which leads to an acceleration of the processes of polymorphic transformations during thermal sintering, as well as the formation of a ZrO2/MgO-type structure with inclusions in the form of MgO grains. The results of the irradiation effect on the stability of the crystal structure of ceramics to deformation swelling due to the accumulation of deformation inclusions showed that ceramics with a monoclinic structure type are the least stable, for which, in the case of high irradiation fluences, the accumulation of deformation distortions leads to polymorphic transformations of the m—ZrO2 → t—ZrO2 type. During the evaluation of the irradiation effect on the change in mechanical properties and the softening degree, it was found that phase transformations of the m—ZrO2 → t—ZrO2 and t—ZrO2 → c—ZrO2 types lead to an increase in crack resistance by 1.5–2.0 times. Meanwhile, the formation of a structure of the ZrO2/MgO type with inclusions in the form of MgO grains in the interboundary space results in a softening resistance growth by over 7-fold. During tests for determining thermophysical parameters, as well as maintaining stability to crystal structure thermal expansion during prolonged thermal exposure, it was found that phase transformations associated with polymorphic transformations of the t—ZrO2 → c—ZrO2 type led to the preservation of the stability of thermophysical properties, even in the case of high irradiation fluences.

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Section: Resultssupporting

confidence: 57%

Study of the Effect of Variation in the Phase Composition of ZrO2/MgO Ceramics on the Resistance to Radiation Damage during Irradiation with Kr15+ Ions

Kurakhmedov,

Morzabayev,

Uglov

et al. 2023

J. Compos. Sci.

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“…Simultaneously, the reduction in porosity of the Y4 sample successfully hindered the entrance of harmful corrosive agents, resulting in a superior corrosion protection for both the coating and the substrate, as well as displaying the optimal corrosion resistance performance. Li et al similarly obtained identical findings in their examination of the pore structure of the MAO coating [37].…”

Section: Electrochemical Corrosion Test Of Mao Coatingsmentioning

confidence: 54%

The Effect of Yttrium Nitrate Content on the Microstructure and Properties of a Micro-Arc Oxidation Coating Prepared on a ZK61M Magnesium Alloy

Li,

Wang,

Geng

et al. 2023

Coatings

Self Cite

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To investigate the effect of the content of yttrium nitrate on the microstructure and properties of micro-arc oxidation coatings on a ZK61M magnesium alloy, this study successfully prepared a ZrO2-Y2O3-containing composite ceramic coating on a ZK61M magnesium alloy by using micro-arc oxidation (MAO) technology, adding different amounts of yttrium nitrate (0 g/L, 0.15 g/L, 0.45 g/L, and 0.75 g/L) to a zirconate electrolyte with the main components of 6 g/L of (NH4)2ZrF6, 4 g/L of NaH2PO4, 1 g/L of NaF, and a pH value of 7.5–8.0. The microstructure, phase composition, corrosion resistance, and friction coefficient of the coating were investigated using a scanning electron microscope, an energy spectrometer, an X-ray diffractometer, a photoelectron spectrometer, an electrochemical tester, and a friction and wear tester, respectively. The results showed that the composite ceramic coating was composed of c-ZrO2, t-ZrO2, m-ZrO2, MgO, Y2O3, and MgF2. Among the MAO coatings prepared in this experiment, it was when the concentration of the Y(NO3)3 was 0.75 g/L that the coating exhibited the best corrosion resistance and wear resistance. The corrosion current density (Icorr) was 1.415 × 10−8 A·cm−2, which was four orders of magnitude lower than that of the substrate. The friction coefficient and wear volume of the coating were reduced by 30.77% and 96.55% compared to the substrate, respectively.

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“…CPE dl and R ct are the double-layer capacitance and the charge transfer resistance related to the film and charge transfer of the surface, respectively [22,30,39]. L and R L indicate inductance and inductive resistance, which depict the low-frequency inductive loop and are associated with pitting corrosion as well as the relaxation of the adsorbed intermediates on the Mg surface [37,[40][41][42]. The fitted R O1 and R O2 as well as the corresponding CPE O1 and CPE O2 of the sample without oxide film are film resistance and constant phase elements, which is caused by the appearance of microvoids in corrosion products film [22,42].…”

Section: Samplesmentioning

confidence: 99%

Comprehensive Unveiling of the Oxidation Resistance and Corrosion Protection of an Oxide Layer Formed on the Gd-Alloyed AZ80 Alloy Surface

Cheng,

Zhou,

et al. 2024

Metals

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In our previous work, the effect of Gd alloying on the oxidation resistance of AZ80 alloy was revealed briefly. However, a comprehensive understanding of the oxidation and corrosion resistance of the oxide layer formed on the Gd alloying AZ80 alloy surface needs to be developed. Thus, in this research, the high-temperature oxidation behaviors, oxidation products, and oxide layer characteristics of AZ80, AZ80-0.47Gd, and AZ80-0.75Gd (wt%) alloys were investigated at 420 °C. The corrosion protection of the oxide layer formed on the alloy surface was evaluated. The results showed that Gd alloying eliminated the content of the low melting point phase of β-Mg17Al12 and promoted the generation of a high melting point phase of Al2Gd. Gd2O3 appeared in the oxide layer and facilitated the propagation of homogeneous oxidation as well as densification of the oxide layer. In addition, the firm oxide layer showed characteristics of a blurred boundary with the magnesium matrix. After immersion of the oxide layer containing gadolinium oxide, the products of corrosion were massively nodulated, leading to the passivation of corrosion. This research provides new ideas for magnesium alloy protective layer preparation via a high-temperature oxidation technique.

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Improved corrosion resistance of ZrO2/MgO coating for magnesium alloys by manipulating the pore structure

Cited by 14 publications

References 53 publications

Study of the Effect of Variation in the Phase Composition of ZrO2/MgO Ceramics on the Resistance to Radiation Damage during Irradiation with Kr15+ Ions

Study of the Effect of Variation in the Phase Composition of ZrO2/MgO Ceramics on the Resistance to Radiation Damage during Irradiation with Kr15+ Ions

The Effect of Yttrium Nitrate Content on the Microstructure and Properties of a Micro-Arc Oxidation Coating Prepared on a ZK61M Magnesium Alloy

Comprehensive Unveiling of the Oxidation Resistance and Corrosion Protection of an Oxide Layer Formed on the Gd-Alloyed AZ80 Alloy Surface

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