The importance of type of Ti-based additives on the PEO process and properties of Al2O3-TiO2 coating

Hashemzadeh, Mehri; Raeissi, K.; Ashrafizadeh, F.; Simchen, Frank; Hakimizad, Amin; Santamaria, Monica; Lampke, Thomas

doi:10.1016/j.surfin.2022.102523

Cited by 2 publications

(1 citation statement)

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“…Figure 7 depicts the characterization of various tracer samples using Raman spectroscopy. As the graph shows, the Eg [35,36] vibrational mode of the anatase phase is observed at 141 cm −1 , and the Eg and A1g vibrational modes of rutile are detected at 445 cm −1 and 613 cm −1 , respectively. Additionally, a multiple scattering mode of rutile appears at 240 cm −1 .…”

Section: Phase Structure Of Peo Coatingsmentioning

confidence: 97%

Study on Discharge Characteristics and Microstructural Evolution of PEO Coatings Based on an Al/Ti Tracer Substrate

Li,

Xia

2023

Coatings

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In this study, samples underwent plasma electrolytic oxidation (PEO) treatment using Al/Ti tracer substrates for 5, 10, 20, 35, and 55 min. The ionization states were determined using Optical Emission Spectroscopy (OES). Microstructural and elemental analyses were conducted using scanning electron microscopy equipped with energy dispersive spectrometry (SEM-EDS). The structural organization and phase composition of the coatings were characterized using X-ray diffraction (XRD) and Raman spectroscopy, respectively. The research findings indicate that the early discharge stage is dominated by discharge within the pre-deposited Al layer, which undergoes gradual oxidation along the thickness direction, while Ti (0.25 wt%) is found on the coating surface. The power increase was 56% of the total increase from min 5 to min 10 of discharge. As discharge time increased, the spectral peaks corresponding to Ti gradually became stronger and were accompanied by gradual enhancement of the crystallinity of the anatase and rutile phases within the coating. The coating surface displayed closed and semi-closed pores in the middle of the discharge. After 55 min of discharge, amorphous SiO2 was observed and Ti content on the coating surface increased to 4.59 wt%.

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Section: Phase Structure Of Peo Coatingsmentioning

confidence: 97%