The effect of addition of K2ZrF6 on the structures and properties of AZ31 magnesium alloy MAO coating

Chen, X.W.; Zhang, Ming; Zhang, D.F.; Cai, L.P.; Song, Hao; Zeng, Dezhi

doi:10.1016/j.jallcom.2023.171474

Cited by 8 publications

(1 citation statement)

References 23 publications

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“…As reported, the formation of a ZrO 2 -containing coating on the surface of a magnesium alloy can enhance its corrosion resistance. Chen et al [15] obtained a ZrO 2 -containing coating composed of MgO, Mg 2 SiO 4 , and ZrO 2 using MAO on an AZ31 magnesium alloy in a K 2 ZrF 6 electrolyte. The results of their study indicated that the composite coating significantly improves the corrosion resistance of the magnesium alloy.…”

Section: Introductionmentioning

confidence: 99%

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

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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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Section: Introductionmentioning

confidence: 99%