US 12,006,577 B2
Method for protection against corrosion
Amar Saboundji, Moissy-Cramayel (FR); and Luc Patrice Bianchi, Moissy-Cramayel (FR)
Assigned to SAFRAN, Paris (FR)
Appl. No. 17/614,145
Filed by SAFRAN, Paris (FR)
PCT Filed May 26, 2020, PCT No. PCT/FR2020/050874
§ 371(c)(1), (2) Date Nov. 24, 2021,
PCT Pub. No. WO2020/240130, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 1905569 (FR), filed on May 27, 2019.
Prior Publication US 2022/0251713 A1, Aug. 11, 2022
Int. Cl. C23C 28/00 (2006.01); C23C 4/11 (2016.01); C23C 4/134 (2016.01); C23C 14/02 (2006.01); C23C 14/34 (2006.01)
CPC C23C 28/3455 (2013.01) [C23C 4/11 (2016.01); C23C 4/134 (2016.01); C23C 14/024 (2013.01); C23C 14/028 (2013.01); C23C 14/34 (2013.01); C23C 28/3215 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A process for protecting a hafnium-free nickel-based single-crystal superalloy component against corrosion and oxidation, wherein the process comprises:
manufacturing a hafnium-free nickel-based single-crystal superalloy component,
depositing a first hafnium-free bond coat on the component,
depositing a second hafnium-doped bond coat on the first bond coat,
depositing a third hafnium-free bond coat on the second bond coat,
stripping the third bond coat by sandblasting to at least partially remove the third bond coat and increase a surface roughness of an upper bond coat formed by the second bond coat or formed by the second bond coat and by a remaining part of the third bond coat obtained after the sandblasting,
carrying out an oxidation treatment so as to obtain a layer of hafnium-doped oxidized material on a surface of the upper bond coat, and
depositing a thermal barrier layer on the layer of hafnium-doped oxidized material.