Chemical process for matification
AssigneeSafran Aircraft Engines
InventorPierre-Joseph Xavier Hervé Saget
Life of this patent
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Abstract
The invention relates to a method for mattifying a turbine engine part (10) comprising a metal material, the method comprising a step of immersing said part in a chemical bath (14) for mattifying said metal part (10), the bath (14) comprising at least sodium fluoride (NaF) and hydrofluoric (HF) acid, characterised in that the immersion step lasts between 2 and 15 minutes.
Claims20
A method of mapping a turbine engine part comprising a metal material, the method comprising the following steps:
- a step of preparing a surface of the at least one part comprising:
- a step of degreasing the part for 10 minutes at a temperature of between 45 and 55° C., during which the tool is immersed in an alkaline bath;
- a first step of passive rinsing of 60 seconds at ambient temperature, during which the tool is immersed in a water bath;
- and
- a second step of current rinsing of 120 seconds at ambient temperature, during which the tool is immersed in a running water bath or water-sprayed;
- following the step of preparing the surface, mattifying the part by immersing said part in a chemical bath for mattifying said metal material, the chemical bath comprising at least sodium fluoride (NaF) and hydrofluoric (HF) acid, that wherein the immersion step lasts between 2 and 15 minutes;
- and
- measuring by a contactless method a parameter of the part to establish a mapping.
A method of mapping a turbine engine part comprising a metal material, the method comprising the following steps:
- a step of preparing the surface of the at least one part comprising:
- a step of degreasing the part for 10 minutes at a temperature of between 45 and 55° C., during which the tool is immersed in an alkaline bath;
- a first step of passive rinsing of 60 seconds at ambient temperature, during which the tool is immersed in a water bath;
- and
- a second step of current rinsing of 120 seconds at ambient temperature, during which the tool is immersed in a running water bath or water-sprayed;
- following the step of preparing the surface, mattifying the part by immersing said part in a chemical bath for mattifying said metal material, the chemical bath comprising at least sodium fluoride (NaF) and hydrofluoric (HF) acid, the immersion step lasting between 2 and 15 minutes, and the chemical bath further comprising sulphuric acid (H2SO4) and water (H2O), wherein the homogenous dissolution occurs successively and/or at the same time according to two of the following chemical reactions:
- NaF+H2SO4═FH+NaHSO4 (1)
- TiO2+6HF→TiF6H2+H2O;
- and (2)
- measuring by a contactless method a parameter of the part to establish a mapping.
A method of mapping a turbine engine part comprising a metal material, the method comprising:
- installing said part in a tool;
- immersing said part in a chemical bath for mattifying said metal material, the chemical bath comprising sodium fluoride (NaF) and hydrofluoric (HF) acid, wherein the immersion step lasts between 2 and 15 minutes;
- rinsing the part, carried out after the immersing, and comprising:
- a passive rinsing step of 60 seconds at ambient temperature, during which the tool is immersed in a water bath;
- a current rinsing step of 120 seconds at ambient temperature, during which the tool is immersed in a running water bath or water-sprayed;
- and
- a final hot rinsing step of 45 seconds at a temperature greater than or equal to 70° C., during which the tool is immersed in a running water bath or water-sprayed;
- and
- measuring by a contactless method a parameter of the part to establish a mapping.
Dependencies are inferred from the claim text.