Plasma‐sprayed TiO2 coatings: Hydrophobicity enhanced by ZnO additions

Titanium dioxide (TiO2) powder mixed individually with 10 and 30 weight percentage (wt%) ZnO was thermally sprayed onto a grade B API 5 L carbon steel substrate by atmospheric plasma spraying. The effect of the addition of ZnO (10 wt% and 30 wt%) on the microstructures and wettability properties of...

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Bibliographic Details
Published in:International journal of applied ceramic technology 2022-07, Vol.19 (4), p.2213-2221
Main Authors: Yusuf, Yusliza, Ghazali, Mariyam Jameelah, Juoi, Jariah Mohamad, Rahim, Toibah Abd, Mustafa, Zaleha
Format: Article
Language:English
Subjects:
Anatase
Carbon steels
Coatings
Hydrophobicity
Microcracks
Microstructure
Plasma spraying
Substrates
Surface roughness
TiO2/ZnO coating
Titanium dioxide
Wettability
wettability properties
X-ray diffraction
Zinc oxide
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Summary:Titanium dioxide (TiO2) powder mixed individually with 10 and 30 weight percentage (wt%) ZnO was thermally sprayed onto a grade B API 5 L carbon steel substrate by atmospheric plasma spraying. The effect of the addition of ZnO (10 wt% and 30 wt%) on the microstructures and wettability properties of the TiO2/ZnO coatings was investigated. The characterization of the coatings was carried out using scanning electron microscopy, X‐ray diffraction (XRD), laser confocal microscope, and sessile droplet system. The XRD analysis of the coating revealed that the anatase phase of TiO2 in the powder state transformed into rutile phases for the produced TiO2/ZnO coatings. Surface microstructure analysis revealed that the coatings had typical micro‐roughened surfaces of plasma spraying products. The coating with 30 wt% ZnO produced a coating with remarkable pores and microcracks compared with the TiO2 coating and coating with 10 wt% ZnO. Additionally, the increase in the wt% of ZnO increased the surface roughness value of the produced coatings and substantially changed the wettability properties of the TiO2 coating from hydrophilic to hydrophobic.    
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.14009