Abstract: The method according to the invention comprises a macrographic etching step followed by a “bleaching” step by electrolytic etching by means of a bath containing at least phosphoric acid and a weak acid. This method allows components made of superalloys to be easily and effectively inspected, including when they contain elements such as rhenium or ruthenium.

Abstract: The method according to the invention comprises a macrographic etching step followed by a “bleaching” step by electrolytic etching by means of a bath containing at least phosphoric acid and a weak acid. This method allows components made of superalloys to be easily and effectively inspected, including when they contain elements such as rhenium or ruthenium.

Abstract: A gas turbine engine is disclosed having an air compressor and a generally annular combustion chamber, with a generally annular diffuser located between the compressor and the combustion chamber so as to direct air exiting from the compressor toward the combustion chamber. The diffuser has inner and outer walls and defines an exit which is located adjacent to an opening in an upstream wall portion of the combustion forming a dome cowl. The dome cowl divides the air emanating from the diffuser exit into a primary air stream passing through the opening and one or more secondary air streams which pass between the walls defining the combustion chamber and the walls of a casing enclosing the combustion chamber assembly. A guide is associated with the diffuser for directing water in the air passing through the diffuser away from the opening such that it will not pass directly into the combustion chamber.