Electrochemical Study on S2- to the Surface Passivation Film of T23 Material Used in Supercritical Unit Tubes

Mu Song Lin; Fei Yu; Wei Su; Yuan Chen

doi:10.4028/www.scientific.net/AMR.424-425.641

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 424-425Electrochemical Study on S2- to the Surface...

Electrochemical Study on S^2- to the Surface Passivation Film of T23 Material Used in Supercritical Unit Tubes

Abstract:

This article had studied the corrosion behavior of S2- which destroyed the surface passivation film of T23 materials in supercritical water tubes by means of electrochemistry workstation, X-ray diffraction(XRD), and Scanning electronic microscope(SEM). According to the experimental results and analysis, it can be concluded as followed: After the T23 surface formed the passivation film, T23 was eroded in the S2- solution.Finally, T23 surface pitting process entered the stable state pitting time, while the potential and the current were stable after 5000s by electrochemical noise; The T23 surface corrosion product presented the massive fragments at 150°C in autoclave experiment, its principal constituent was Fe2(SO4)3 or Fe2(SO3)3, which had direct relation with the dissolved quantity of Fe3+ and the oxygen existed in the open system.

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Periodical:

Advanced Materials Research (Volumes 424-425)

Pages:

641-645

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.424-425.641

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Online since:

January 2012

Authors:

Mu Song Lin, Fei Yu, Wei Su, Yuan Chen

Keywords:

Corrosion Product, Electrochemical Noise, Passivation Films, Pitting, S^2-

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