Corrosion properties of plasma-sprayed Al2O3-TiO2 coatings on Ti metal

Three different oxides of CrO2-TiO2, Al2O3 and Al2O3-TiO2 were plasma-sprayed on Ti substrate to evaluate the crystal structure and the corrosion properties of the coatings. No phase change of the coatings after corrosion test in 0.5 M H2SO4 solution at 25°C was found regardless of the presence of t...

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Bibliographic Details
Published in:Journal of materials science 2006-04, Vol.41 (7), p.2059-2065
Main Authors: SONG, Yo-Seung, LEE, In-Gyu, SHIN NAM HONG, KIM, Bae-Yeon, KOO HYUN LEE, DEUK YONG LEE
Format: Article
Language:English
Subjects:
Aluminum oxide
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Corrosion potential
Corrosion protection
Corrosion resistance
Corrosion tests
Cross-disciplinary physics: materials science
rheology
Crystal structure
Current density
Exact sciences and technology
Low currents
Materials science
Metals. Metallurgy
Miscellaneous
Phase transitions
Physics
Pitting (corrosion)
Plasma spraying
Porosity
Protective coatings
Repair & maintenance
Substrates
Sulfuric acid
Surface roughness
Surface treatments
Technical ceramics
Titanium
Titanium dioxide
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Summary:Three different oxides of CrO2-TiO2, Al2O3 and Al2O3-TiO2 were plasma-sprayed on Ti substrate to evaluate the crystal structure and the corrosion properties of the coatings. No phase change of the coatings after corrosion test in 0.5 M H2SO4 solution at 25°C was found regardless of the presence of the NiCoCrAlY bond layer. Electrochemical measurements and SEM results revealed that the single coatings without the bond layer were always effective against corrosion resistance due to lower current density within the passive region. Pitting corrosion of the surface was observed for the Al2O3 coating. It can be concluded that the Al2O3-TiO2 coating without the bond layer may be the best oxide among the oxides investigated due to low porosity (5.4%), smooth surface roughness (4.5 μm), low current density (6.3 × 10‒8 A/cm2) in the passive region, low corrosion potential (Ecorr, ‒0.55 V) and no pitting corrosion.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-006-4506-6