Resistance of nanostructured titanium dioxide coatings to erosion corrosion
Authors: Ahmad, Z.1; Aleem, Abdul B.J.2
Source: Tribology - Materials, Surfaces & Interfaces, Volume 3, Number 1, March 2009 , pp. 41-48(8)
Publisher: Maney Publishing
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Abstract:
Investigations were undertaken to determine the erosion corrosion resistance of nanostructured titanium dioxide coatings in 5 vol.-%-3·5 wt-% NaCl slurry at velocities ranging from 1 to 4 m s-1 in a recirculating loop. Two types of nanopowders, spray dried and densified (AE 9342) and chemically precipitated and spray dried (AE 9303) were used. The results were compared with a conventional TiO2 coated samples (SM 102). Specimen AE 9342 showed a higher resistance compared to AE 9303. No localised corrosion on the above specimen was observed. The erosion corrosion was caused by etching of intersplat boundaries. The erosion corrosion is dependent on surface topography. A homogeneous distribution of nanoagglomerates of unmelted, partially melted nanoparticles embedded in coatings, a large area of melted zone and porosity less than 1% enhances the erosion corrosion resistance of nanostructured titanium dioxide coatings.Keywords: NANOSTRUCTURED COATINGS; EROSION CORROSION; PLASMA AIR SPRAYING; SPLATS LAMELLAE; SPRAYING KEY PARAMETERS; SURFACE TOPOGRAPHY
Document Type: Research article
DOI: 10.1179/175158309X419070
Affiliations: 1: Mechanical Engineering Department, King Fahd University of Petroleum and Mineral, Dhahran 31261, Saudi Arabia 2: Mechanical Engineering Department, King Fahd University of Petroleum and Mineral, Dhahran 31261, Saudi Arabia;, Email: abaleem@kfupm.edu.sa
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