Measurement of coating properties and performance
TWI has an extensive range of facilities for characterisation, testing and analysis of coatings.Coating analysis and characterisation tests
- Chemical composition
ASTM C633 bond pull test for thermally sprayed coatings 
- - Inert gas fusion
- - combustion
- - SEM
- Element mapping by SEM
- Density by immersion
- Microstructure
- - Metallographic examination
- - X-ray diffraction
- - Microhardness
- Surface roughness
- - Diamond stylus
Coating performance tests
- Adhesion
- - Bond pull (ASTM C633)
- - PAT adhesion tests (ASTM D4541)
- Wear
- - Pin-on-disc (TWI procedure)
- - Rubber wheel (ASTM G65)
- Corrosion
- - Ecorr
- - Corrosion current density
- - Salt spray
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