A method for treating a component to prevent erosion of such component

An apparatus for spraying the surface of a component, said apparatus including:

• a first heater for pre-heating a first portion of inert gas up to a pre-heating temperature comprised between 400° C. and 500° C.;
• a spray gun including a final heater for heating said first portion of inert gas up to a spray temperature comprised between 550° C. and 800° C. and a supersonic nozzle for creating a spray jet including said inert gas and a powder material having a composition including Co at a mass percentage comprised between 15% and 70%;
• a powder feeder preparing a mixture between said powder material and a second portion of inert gas;
• at least a first duct for connecting said first heater to said final heater;
• at least a second duct for connecting said powder feeder to said supersonic nozzle.