Abstract
Investigations were undertaken to determine the erosion- corrosion resistance of plasma-sprayed titanium dioxide (TiO2 nanostructured coatings. Nanopowders were used to make agglomerates. Both conventional Ti0 2-coated and nanostructured samples (n-TiO2 were exposed to 3.5 wt% sodium chloride (NaCl) containing 2 vol% polystyrene particles at velocities ranging from 1 ms-1 to 4 ms-1. In general they exhibited a fairly good resistance to erosion-corrosion. The nanostructured samples processed, sprayed, and densified (AE 9342) before plasma spraying showed relatively higher resistance to erosion-corrosion compared to sample AE 9303, which was spray-dried and chemically precipitated before spray. It is shown by morphological studies that a homogeneous distribution of nanoagglomerates and dense packing of splats with larger melted zones creates conditions favorable to resist erosion-corrosion. The splat boundaries appear to offer a preferential passage to erosion-corrosion.
| Original language | English |
|---|---|
| Pages (from-to) | 611-623 |
| Number of pages | 13 |
| Journal | Corrosion |
| Volume | 65 |
| Issue number | 9 |
| DOIs | |
| State | Published - Sep 2009 |
Keywords
- Erosion-corrosion
- Homogeneous structure
- Nanostructured coatings
- Nanqfeed powder
- Plasma air spraying
- Splat lamellae
- Spraying key parameters
- Surface topography
ASJC Scopus subject areas
- General Chemistry
- General Chemical Engineering
- General Materials Science