Patent · US Expired

Etch solution and associated process for removal of protective metal layers and reaction deposits on turbine blades

US5248381A · kind A · utility

12Cited by

4References

10Claims

0Family size

Assignee

MTU Motoren-und Turbinen-Union MÃƒÂ¼nchen GmbH · DE

Inventors

Rolf-Jorg Dunker · Dachau, DE
Holger Polanetzki · Dachau, DE
Martin Thoma · Munich, DE

Key dates

Filing date	Jun 16, 1992
Grant date	Sep 28, 1993
Priority date	—
Expiry date	Jun 16, 2012

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC23F1/44
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

An etch solution for the removal of metallic layers, which provide protection against corrosion by hot gases, and of deposits resulting from hot gas reactions on turbine blades in power units comprising a salt solution and an inhibitor. The salt solution consists of a hydrogen sulfate in the amount of 5 to 45% by weight and the inhibitor is present in the amount of 0.5 to 10% by weight. The total amount of the hydrogen sulfate and inhibitor is present with at least 50% by weight of water based on the total etch solution. Using this etch solution, layers preferably comprising MCrAlY are removed from turbine blades comprised of alloys of Ti, Co or Ni.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.