The effect of precipitated phases causded by thermal effect on the corrosion resistance of 2205 duplex stainless steel
The research studied the types and characteristics of precipitated phases of 2205 duplex stainless steel under different thermal effects.The effect of these phases on the steel's corrosion resistance was tested by analyzing the potentiodynamic polarization curve,electrochemical impedance spectroscopy,and surface morphology after potentiodynamic scanning of the steel specimen in both solid-solution state and under different thermal effects.The results showed that the solid-solution material exhibited the best corrosion resistance and repassivation performance.The corrosion resistance of the material was most severely reduced due to the highest content of X and σ precipitates after aging at 850 ℃,and it changed from pitting to selective corrosion under over potential.After aging at 900 ℃,the decline of corrosion resistance of the steel was alleviated as a result of the reduced precipitated phase content.
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