Specialists from Perm National Research Polytechnic University (PNRPU) have developed a method to reduce the time and costs of repairing gas turbine units (GTU). This was reported by the university's press service.
The essence of the method is to clean the nozzle blade of the GTU engine using a solution of sulfuric and orthophosphoric acids in an autoclave.
The cleaning was divided into two stages. First, the sample was placed in an autoclave with an aqueous solution of sulfuric and orthophosphoric acids of different concentrations (5%; 7.5%; 10%). It was cleaned at a temperature of 230 °C for one hour.
In the second stage, the scientists removed the remaining oxide film using ultrasonic treatment in distilled water for 30 minutes. An electronic scanning microscope was used to analyze the surface of the sample.
After cleaning with a 10% solution, the surface of the sample was completely rid of metal oxides. The exfoliated film did not dissolve in the mixture. This means that the acids used primarily corrode the layer of the blade alloy surface located under the oxide film, and leave the film itself more or less intact.
Research has shown that using a 10% acid solution will help speed up repairs, reduce resource costs and increase economic benefits in the production of blades.
Earlier, www1.ru reported that an innovative vehicle is being developed in Perm.
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