Effect of Cl- Concentration on Pitting Corrosion Property of Maraging Hardened Stainless Steel Based on Pourbaix Diagram

Xin Zhang; De Ning Zou; Yu Qing Zhou; Xuan Na; Wei Zhang; Ying Han

doi:10.4028/www.scientific.net/MSF.940.59

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HomeMaterials Science ForumMaterials Science Forum Vol. 940Effect of Cl- Concentration on Pitting Corrosion...

Effect of Cl^- Concentration on Pitting Corrosion Property of Maraging Hardened Stainless Steel Based on Pourbaix Diagram

Abstract:

The corrosion behavior of maraging hardened stainless steel (MHSS) in different Cl^-medium was investigated by thermodynamics simulation and electrochemical experiments. The simulation results show that the thermodynamic stability zone decreases with the increase of the concentration of Cl^-. Some of chromium transformed into Cr(OH)²⁺ and adsorbed on the surface of stainless steel, and others generated Cr₂O₃ protecting the matrix. Mo reacted with O₂ to form MoO₄^2- adsorbed on the surface of the material, which inhibited the destruction of Cl^-. The electrochemical experiments indicate that the concentration of Cl^- is in the range of 2%-7%. The pitting potential and self-corrosion potential of MHSS decreased linearly with the increase of ion concentration, and the pitting corrosion resistance of MHSS decreased. When the self-corrosion current increases from 1.9888 μA to 2.6524 μA, the corrosion tendency of the material enhances.

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Materials Science Forum (Volume 940)

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59-64

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https://doi.org/10.4028/www.scientific.net/MSF.940.59

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Online since:

December 2018

Authors:

Xin Zhang, De Ning Zou*, Yu Qing Zhou, Xuan Na, Wei Zhang, Ying Han

Keywords:

Cl^- Concentration, E-pH Diagrams of Fe-Cr-Cl^--H₂O, Maraging Hardening Stainless Steel, Pitting

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