Abstract: A method for preventing corrosion of an impeller-shaft assembly of a turbomachine comprises the steps of assembling an impeller on a shaft in order to define an impeller-shaft assembly; plating the assembly by inserting the assembly into a plating bath; and coating at least a first predefined surface on the impeller and a second predefined surface on the shaft wherein the coating step is performed by spraying the predefined surfaces.

Abstract: A method for preventing corrosion in a component of a turbo-machine having a metal substrate made of carbon steel, low alloy steel and stainless steel includes: a first deposition step of depositing a first metallic layer on the substrate by electroplating; a second deposition step of depositing at least a second layer of a nickel alloy on the first layer by electroless plating; at least one thermal treatment step after the deposition steps, said thermal treatment being applied at a temperature and for a time depending on the overall thickness of the layers, the value of said temperature being directly proportional to the thickness, the value of said time being inversely proportional to the temperature.

Abstract: A method for preventing corrosion of an impeller-shaft assembly of a turbomachine comprises the steps of assembling an impeller on a shaft in order to define an impeller-shaft assembly; plating the assembly by inserting the assembly into a plating bath; and coating at least a first predefined surface on the impeller and a second predefined surface on the shaft wherein the coating step is performed by spraying the predefined surfaces.

Abstract: A diffuser of a rotating fluid machine that processes a gas with high level of contaminants is provided, the diffuser having an annular surface portion facing rotating vanes of a rotor of the rotating fluid machine, the annular surface portion being at least partially covered with an abradable and anti-encrustation coating including (A) a first lower metal-based coating layer applied on the annular surface portion of the diffuser, and (B) a second upper polymer-based coating layer applied on the first lower metal-based coating layer, wherein the first lower metal-based coating layer comprises 99% by weight of aluminum powder based on the total weight of the first lower-based coating layer and is anchored to the annular surface with a nickel and aluminum (NiAl) binder.

Abstract: A method for preventing corrosion in a component of a turbo-machine having a metal substrate made of carbon steel, low alloy steel and stainless steel includes: a first deposition step of depositing a first metallic layer on the substrate by electroplating; a second deposition step of depositing at least a second layer of a nickel alloy on the first layer by electroless plating; at least one thermal treatment step after the deposition steps, said thermal treatment being applied at a temperature and for a time depending on the overall thickness of the layers, the value of said temperature being directly proportional to the thickness, the value of said time being inversely proportional to the temperature.

Abstract: A method to produce a turbomachinery impeller, which includes, at least, the following steps: creation of the impeller using a light alloy, and coating of the impeller with a nickel-plating coating.

Abstract: A method for obtaining a protective coating on a surface to be treated of a light alloy mechanical component of a turbomachine. The method comprises associating a first coating layer resistant to corrosion on the surface to be treated of the mechanical component, and associating a second coating layer resistant to erosion, abrasion and high temperatures on the first coating layer.

Abstract: The convector includes at least one finned tube bundle (7) in the tubes of which a fluid to be cooled is made to circulate and at least one fan (11) producing an air flow that strikes the outside of said finned tubes. The convector includes an adiabatic chamber (13) through which a air flow (F1) passes, positioned upstream of the tube bundle (7), inside which water is nebulized and vaporized. The adiabatic chamber (13) is defined by side walls (5) and by at least two evaporation honeycomb fill packs (15, 17).

Abstract: The convector comprises at least one finned tube bundle (7) in the tubes of which said fluid to be cooled is made to circulate and at least one fan (11) producing an air flow that strikes the outside of said finned tubes. The convector comprises an adiabatic chamber (13) through which said air flow (F1) passes, positioned upstream of the tube bundle (7), inside which water is nebulized and vaporized. The adiabatic chamber (13) is defined by side walls (5) and by at least two evaporation honeycomb fill packs (15, 17).

Abstract: An abradable and anti-encrustation coating is described for a rotating fluid machine (10) of the type comprising a casing (12), in which a shaft (14) equipped with at least one rotor (16) having a series of circumferential vanes (18) is rotatingly assembled and at least one diffuser (20) integral with the casing (12). The outer edge of each circumferential vane (18) faces an annular surface portion (28) of the diffuser (20). The annular surface portion (28) of the diffuser (20) is at least partially covered with a coating which can be abraded by the outer edge of each circumferential vane (18), said abradable coating comprising of a first lower metal-based coating layer (30), applied on the annular surface portion (28) of the diffuser (20), and a second upper polymer-based coating layer (32), applied on the first lower metal-based coating layer (30).

Abstract: Vapour turbine operating with geothermal vapours containing corrosive agents or aggressive substances such as chlorides and/or sulfides in particular. The turbine comprises a series of stator blades and a series of rotor blades, each stator blade of the series of stator blades comprises a surfacing consisting of a nickel alloy containing a quantity of nickel ranging from 54% to 58% by weight to avoid the washing of the geothermal vapours, at the same time maintaining a high useful life of the series of stator blades and vapour turbine.

Abstract: Vapour turbine operating with geothermal vapours containing corrosive agents or aggressive substances such as chlorides and/or sulfides in particular. The turbine comprises a series of stator blades and a series of rotor blades, each stator blade of the series of stator blades comprises a surfacing consisting of a nickel alloy containing a quantity of nickel ranging from 54% to 58% by weight to avoid the washing of the geothermal vapours, at the same time maintaining a high useful life of the series of stator blades and vapour turbine.