Effect of In 2 (SO 4 ) 3 on characteristics of Al–Li alloy MAO coating

Self Cite

To research the impact of various Er2(SO4)3 additions on the TC11 alloy's micro-arc oxidation (MAO) coating, the MAO coating was tested and examined using scanning electron microscopes (SEM), X-ray diffractometers (XRD), X-ray photoelectron spectroscopy (XPS), and electrochemical workstations. The findings demonstrate that the addition of Er2(SO4)3 raises the oxidation voltage, improves the uniformity of the discharge, reduces the dimension of the discharge micropores on the surface, and increases the density and thickness of the coating. The coatings contain the Er element, which appears as Er2O3, and it helps to refine the grain size, which encourages the formation of hard phases like anatase TiO2 and rutile TiO2 and enhances the coatings’ hardness, wear resistance, and corrosion resistance. At an amount of 1.5 g L−1, the Er2(SO4)3 enhanced the overall performance of the coating.

Section: Resultsmentioning

confidence: 99%

“…8–10 Electrical parameters, oxidation period, electrolyte, and additives all have an impact on the coating performance. 11,12 Related research had demonstrated that adding the rare earth element Er to titanium alloys can enhance the alloy's overall performance. Y.K.…”

Section: Introductionmentioning

confidence: 99%

Effects of Er₂(SO₄)₃ doping on characteristics of MAO coating

Sun,

Lan,

Wang

2024

Self Cite

“…Nevertheless, aluminium-lithium alloy is easily corroded by Cl − , H + and other corrosion medium, due to the active lithium element, causing corrosion hazards such as pitting and intergranular corrosion, which restricts the application expansion of aluminium-lithium alloy in aerospace [3,4]. The corrosion resistance of aluminium-lithium alloy can be enhanced by surface-treatment technologies, including anodizing [5], shot peening [6] and MAO [7]. Compared with conventional anodizing and shot peening, MAO technique has become a research hotspot because of its simple process, environmental-friendly and excellent corrosion resistance of its products.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, additives are regarded as a key factor. Research shows that adding rare earth oxides or rare earth salts into the electrolyte can improve surface characteristics and corrosion protection of coatings, such as Y 2 O 3 particles, indium sulphate and so on [7,14]. So far, the research on doping scandium nitrate into MAO coating of 2195 aluminium-lithium alloys has not been introduced.…”

Section: Introductionmentioning

confidence: 99%

Influences of Sc(NO₃)₃ on characteristics of micro-arc oxidation coatings

Yang

Wang

Liu

2023

Self Cite

Micro-arc oxidation (MAO) coatings were fabricated on 2195 aluminium-lithium alloy substrate, using a silicate and phosphate electrolyte with variable scandium nitrate (Sc(NO 3 ) 3 ) concentrations. The properties of the coatings were analysed by scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical workstation. The comprehensive analysis demonstrates that adding proper amount of Sc(NO 3 ) 3 increased the oxidation voltage, which transformed the worm shape discharge micropores into round-hole shape, and the MAO coatings presented a doublelayer structure. The primary phase composition of the coatings was γ-Al 2 O 3 , α-Al 2 O 3 , Sc 2 O 3 and Al 3 Sc. The optimum concentration of Sc(NO 3 ) 3 was 0.6 g L −1 . The hardness reached a maximum value of (1284 ± 43.5) HV, which was about 2.5 times higher than that without adding. The self-corrosion current density reduced from 138.00 × 10 −7 A cm −2 (substrate) to 3.65 × 10 −7 A cm −2 , which was approximately two orders of magnitude lower, indicating that the corrosion resistance was improved.

“…Plasma electrolytic oxidation (PEO) is a ceramic film-grown process on the surfaces of Al, Mg, Ti, Zr, Ta and other valve metals operating at a specific working voltage and in specific electrolyte solution, accompanied by transient high temperature and high pressure of plasma discharge [17][18][19][20]. The surface of the oxide film produced by PEO usually presents a sparse and hole-containing appearance, which can provide migration paths for Li + diffusion when the film acts as the electrode for LIBs.…”

Section: Introductionmentioning

confidence: 99%

Facile fabrication of TiO₂/ZnO composite film anode by plasma electrolysis

Yang

Lü

Zhang

et al. 2022

A TiO 2 /ZnO composite film which served as the bind-free anode for lithium-ion battery was rapidly constructed on Ti foil by the one-step plasma electrolytic oxidation process. The fabricated TiO 2 -based transition metal oxide composites took advantage of the high theoretical capacity of ZnO and the good structural stability of TiO 2 , showing a high specific capacity (706.2 mAh g −1 over 400 cycles at 0.1 A g −1 ) and a good rate capability (capacity reversible after 2.0 A g −1 ). When the scan rate gradually elevated from 0.2 to 1.0 mV s −1 , the pseudocapacitance contribution increased from 63.9% to 81.2%. Besides, the holecontaining morphology of the film guaranteed efficient diffusion and excellent dynamic characteristics for Li + . The whole film preparation process was accompanied by a facile inliquid plasma discharge with an average electron temperature of 3519 K. This high-efficiency and low-cost approach extends the practical territory of transition metal oxide anodes.