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03398 SELECTIVE CORROSION IN DUPLEX STAINLESS STEEL

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Product Number: 51300-03398-SG
ISBN: 03398 2003 CP
Author: Wen-Ta Tsai, Kuen-Ming Tsai, Changjan Lin
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In duplex stainless steel, the two constituent phases, namely ferritic (a) and austenitic (7) phases, have different crystal structure and chemical composition. They may thus exhibit different corrosion resistances in aqueous environment. In this investigation, an electrochemical technique with spatial resolution was employed to measure the potential difference between these two constituent phases in 2205 duplex stainless steel. Image analyzing techniques were also used to examine the preferential corrosion between a and 7 phases. The experimental results showed that ferrite had a higher potential than austenite in 0.01 M NaC1 solution. In 2M H2SO4 + xM HC1 solution, two distinct peaks appeared in the anodic polarization curve in the passive-to-active transition region. Preferential corrosion occurred in the ferrite phase at a lower anodic peak potential, while in austenite at a higher anodic peak potential.

Keywords Duplex stainless steel, selective corrosion, micro-area potential distribution
In duplex stainless steel, the two constituent phases, namely ferritic (a) and austenitic (7) phases, have different crystal structure and chemical composition. They may thus exhibit different corrosion resistances in aqueous environment. In this investigation, an electrochemical technique with spatial resolution was employed to measure the potential difference between these two constituent phases in 2205 duplex stainless steel. Image analyzing techniques were also used to examine the preferential corrosion between a and 7 phases. The experimental results showed that ferrite had a higher potential than austenite in 0.01 M NaC1 solution. In 2M H2SO4 + xM HC1 solution, two distinct peaks appeared in the anodic polarization curve in the passive-to-active transition region. Preferential corrosion occurred in the ferrite phase at a lower anodic peak potential, while in austenite at a higher anodic peak potential.

Keywords Duplex stainless steel, selective corrosion, micro-area potential distribution
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51318-11625-Cracking of Duplex Stainless Steel in Refining Operations

Product Number: 51318-11625-SG
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