Diffusion coating method and chromium layer produced according to the method

• Main Authors: Pillhöfer, Horst, Seuss, Siegfried, Niedermeier, Markus, Müller, Stefan
• Format: Patent
• Language: English; French; German
• Published: 17.06.2020
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; PERFORMING OPERATIONS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING

Producing a coating made of metal or a metal alloy on a substrate (1) using a diffusion process, comprises heat treating the substrate in an atmosphere (4) including at least one metal halide of the to-be-deposited metal or the metal alloy, where the substrate is provided at least partially with a layer including at least one metal halide in solid and/or liquid form. An independent claim is included for a chromium coat, produced by the above method, on a metallic substrate with a diffusion zone in the substrate and a build-up zone on the substrate, where the build-up zone has a chromium proportion of >= 30 wt.%.