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6680742 
Journal Article 
Comparison of Crevice Corrosion Susceptibility of 2205 Duplex Stainless Steel and 304 Stainless Steel in Hydrofluoric Acid Solution 
Pang, X; Guo, Y; Chi, J; Liang, P; Shi, Y; Zhao, Y 
2018 
0 
Fushi Kexue yu Fanghu Jishu
ISSN: 1002-6495 
30 
4 
362-368 
INSPEC:18705591 
The crevice corrosion behavior of 2205 duplex stainless steel (2205DSS) and 304 stainless steel (304SS) in 5% (mass fraction) HF solution was comparatively investigated by means of immersion test, cyclic polarization curve, electrochemical impedance spectroscopy, electrochemical noise and potentiostatic test methods. The results showed that the two stainless steels all suffered from crevice corrosion, but the corrosion pits of 2205DSS was relatively shallow, while that of 304SS was deeper with larger corroded area. In comparison to 304SS, 2205DSS exhibits higher critical potential (E0,a) and repassivation potential for (Erp) crevice corrosion, while smaller area of hysteresis loop, as well as larger charge transfer resistance and film resistance. The white noise level of 2205DSS was smaller, indicating a slower corrosion reaction for crevice corrosion. Meanwhile, by the same applied potential, 2205DSS presents longer induction period for crevice corrosion and smaller crevice corrosion current density. Therefore, 2205DSS exhibited better crevice corrosion resistance than 304SS, which was mainly related to the difference in compositions and properties of the passive films formed on the surface of the two materials.