Protective coatings
A surface layer is not designed solely according to hardness. It must address the actual damage mechanism: wear resistance, friction reduction, corrosion resistance, a diffusion barrier, a thermal barrier or a combination of these requirements.
Open interactive module →Topic overview
A surface layer is not designed solely according to hardness. It must address the actual damage mechanism: wear resistance, friction reduction, corrosion resistance, a diffusion barrier, a thermal barrier or a combination of these requirements.
Non-diffusion: paints, enamels and linings. Diffusion: carburising, nitriding, carbonitriding and aluminising. Fusion-applied: overlay welding and cladding. Thermophysical: PVD. Thermochemical: CVD.
For welded structures, also assess the layer’s behaviour under heat: porosity, weld-metal contamination, HAZ alteration, distortion and formation of brittle interphases.
What the module covers
- Protective layers and surface treatments
- Layer function
- Classification by character
- Classification by technology
Continue with the practical module.
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