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5. Coating-substrate interactions
Only in the case of metallic coatings are coating-substrate interactions a potential problem. Insofar as it is possible to control them, two cases appear to be of interest: the embrittlement of parts after coating, and the existence of internal stresses in the coating.
5.1 Fragilization
It can occur when the coating operation is accompanied by the release of significant amounts of hydrogen, and when the substrate metal has high mechanical properties (highly quenched steels, high-speed steels, steels with tensile strength R greater than 1,100 MPa).
Coatings likely to cause substrate embrittlement include cadmium, zinc, copper, silver, nickel and chromium. Without attempting to describe the mechanism of hydrogen embrittlement, it can be...
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Coating-substrate interactions
Surface analysis
Bibliography
Article
- MAEDER (G.), LEBRUN (J.L.), SPRAVEL (J.M.) - Caractérisation mécanique des surfaces par diffusion X. - Matériaux et Techniques, 4 et 5, 135-149 (1981).
Work
Standardization
The Afnor catalog can be consulted online: http://www.afnor.fr
Terminology
- Metal coatings and surface treatments – Terminology – Classification – Symbolization - NF A91-010 - 12-84
- Corrosion protection for metals and alloys – Surface treatment, metallic and inorganic coatings – Vocabulary. Classification number : A91-001...
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