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| Effect of Denitration Agent Concentration on Corrosion Resistance and Critical Pitting Temperature of S2205 Stainless Steel |
CUI Haoran1, LIANG Ping1( ), SHI Yanhua1, YANG Zhongkui1, HAN Li2 |
1.School of Mechanical Engineering, Liaoning Petrochemical University, Fushun 113001, China
2.Far East Shaie Oil Refinery Co. , Ltd, Fushun 113001, China |
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Abstract The effect of denitration agent (NaClO2) concentration on the corrosion resistance of S2205 stainless steel in denitration solutions was studied by means of potentiodynamic polarization curve, electrochemical impedance and Mott-Schottky curve measurements. Meanwhile, the variation of critical pitting temperature (CPT) with the NaClO2 concentration was measured by potentiostatic polarization method. The results show that as the NaClO2 concentration increases, the corrosion resistance of the steel decreases first and then increases. In the potential range of 0.4~0.6 V, the insoluble Cr3+ oxide in the passivation film of p-type semiconducting is transformed into soluble Cr6+ oxide, as a result, which degrade the stability of the passivation film. The carrier density is the largest and the relevant corrosion resistance is the worst for the passivation film formed in the solution with 6%NaClO2. The CPTs corresponding to the solutions containing 3%, 6%, and 9% NaClO2 were 65.2, 57.4 and 62.5 ℃, respectively.
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Received: 09 August 2020
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| Fund: Program of Undergraduate Innovation and Entrepreneurship for Liaoning Province(201910148057) |
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Corresponding Authors:
LIANG Ping
E-mail: liangping770101@163.com
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About author: LIANG Ping, E-mail: liangping770101@163.com
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