Structure and properties of Al2O3 coatings formed on NiTi alloy by cathodic plasma electrolytic deposition

Effect of Duty Cycle on Properties of Al2O3 Ceramic Coatings Fabricated on TiAl Alloy via Cathodic Plasma Electrolytic Deposition

“…Figure 6 shows diffraction patterns and rings, amorphous rings, a halo formed by diffuse diffraction, and transmission electron diffraction patterns, indicating that the CPED coatings consisted of nanostructure lattices with a high degree of crystallinity and were well orientated under higher duty cycles. This corresponds to the XRD patterns in Figure 5 and references [ 9 , 11 , 13 ]. The halo formed by diffuse diffraction was most obvious when the duty cycle was 5%, when scattered diffraction patterns and smaller rings were observed in Figure 6 a, and when the crystal lattices displaying CPED coatings included α-Al 2 O 3 and γ-Al 2 O 3 .…”

“…When the duty cycle was fixed at 5%, weak diffraction peaks of amorphous structure appeared in a regional scale from 20° to 35° of XRD patterns. It could be inferred that the CPED coating consisted of a small number in the amorphous phase, due to residual Al(OH) 3 during the CPED process [ 13 , 14 ]. With duty cycle increasing, the intensity of amorphous diffraction peaks became weaker and only sight peaks were detected when the duty cycle was 35%.…”

“…Xue et al prepared CPED coatings on the surface of T8 and 304 stainless steels and the results showed that with increasing reaction time, both the wear-resistance and corrosion-resistance of treated steels was improved [ 11 , 12 ]. Liu et al fabricated alumina ceramic coatings on 304 stainless steel and NiTi alloy and studied the influence of treating frequency of power supply on the microstructure and properties of the coatings [ 8 , 13 ]. However, despite recent progress in the fabrication and performance of CPED coatings, there are few generally accepted theories concerning electrical parameters on the characterization of CPED coating and there is no report studying the effect of duty cycle on the microstructure and properties of CPED coatings.…”

Influence of Solvent and Electrical Voltage on Cathode Plasma Electrolytic Deposition of Al2O3 Antioxidation Coatings on Ti-45Al-8.5Nb Alloys

“…Some physical and chemical reactions were then promoted by high temperature around this plasma zone. Thus, here, Al(OH)3 formed around the cathode surface and then transformed into Al2O3 [33], according to…”

Corrosion resistance of Al2O3‐Y2O3‐SiC coating on depleted uranium prepared by cathode plasma electrolytic deposition

“…With the influence of the plasma discharge, the thermal and physical/chemical effects take place on the cathode surface . With these effects during the plasma process, different ceramic coatings comprised of an inner barrier layer and an outer porous layer are easily fabricated on workpiece surface, including Al 2 O 3 , ZrO 2 ‐Y 2 O 3 , La 2 Zr 2 O 7 and other coatings . As reported in references, the CPED technique possesses these following advantages: (a) high deposition rate; (b) simple equipment and low preparation cost; (c) a low substrate temperature cooled by the surrounding solution; (d) applicable to samples with complex shapes; (e) applicable to a wide variety of conductive materials (different kinds of alloys and carbon material).…”