A Study on the Corrosion Susceptibility and Corrosion Fatigue Characteristics on the Material of Turbine Blade

Turbine Blade재료의 부식민감성과 부식피로특성에 관한 연구

Jo, Seon-Yeong;Kim, Cheol-Han;Ryu, Seung-U;Kim, Hyo-Jin;Bae, Dong-Ho

  • Published : 2000.03.01


Corrosion characteristics on the 12Cr alloy steel of turbine blade was electro-chemically investigated in 3.5wt% NaCI and 12.7wt% Na2S04 solution, respectively. Electro-chemical polarization test, Huey test and Oxalic acid etching test were previously conducted to estimate corrosion susceptibility of the material. And, using the horizontal corrosion fatigue tester, corrosion fatigue characteristics of 12Cr alloy steel in distilled water, 3.5wt% NaCI solution, and 12.7wt%(1M) Na2S04 solution were also fracture-mechanically estimated and compared their results. Parameter considered was room temperature, 60'C and 90'C. Corrosion fatigue crack length was measured by DC potential difference method.Obtained results are as follows,1) 12Cr alloy steel showed high corrosion rate in 3.5wt% NaCI solution and Na2S04 solution at high tempratue.2) Intergranular corrosion sensitivity of 12 Cr alloy was smaller than austenitic stainless steel.3) Corrosion fatigue crack growth rate in 3.5wt% NaCI and 12.7wt%(IM) Na2S04 solution is entirely higher than in the distilled water, and also increased with the temperature increase.


Fatigue Strength;Corrosion Potential;Corrosion Cell;Corrosion Current Density;Corrosion Rate;Intergranular Corrosion;Corrosion Fatigue;Stress Intensity Factor Range;Crack Growth Rate


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