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Chromium diffusion coating was applied to the hot blade sections of 12MW gas turbine, in which residual oils called slurry oil and cycle oil of high sulfur contents (2.5-4.5%) from petrochemical plants are fired. The purpose of the coating was to prevent the blades from high temperature corrosion.The main particulars of the gas turbine for the field test were summarized as follows:Generated thermal output: 12MWFuel: Residual oilGas temperature: 732°C (at turbine inlet)388°C (at turbine outlet)Exhaust gas flow rate: 95kg/secThis gas turbine has suffered severe corrosion on the non-treated 1st stage stationary blades made of Inconel 713°C and Udimet 500 alloys after operations of 2, 800 and 4, 400hrs. Moreover, a slighter corrosion was also observed on the non-treated 2nd stage moving blades made of Inconed 700. After investigation, it was confirmed that these corrosions were due to a typical Sulfidation attack at high temperatures.The 1st stage moving and stationary blades treated with chromium diffusion coating were still kept in the non-attacked state after the operation of 25, 000hrs, wich proved its effectiveness in preventing from such a Sulfidation attack at high temperatures.

Application of Chromium Diffusion Coating to Gas Turbine Blades Firing Residual Oils