期刊
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
卷 13, 期 11, 页码 10314-10324出版社
ESG
DOI: 10.20964/2018.11.12
关键词
Stainless Steels; Precipitation Hardening; Corrosion; Passivation
The objective of this work was to study is use electrochemical techniques to determinate the growth conditions, characteristics and resistance of passive layers of stainless steel (SS): 304 austenitic, 17-4PH (precipitation hardening) and 15-5PH. Passivation of the SS was performed in 15% citric acid at temperatures of 25 and 49 degrees C. The corrosion kinetics was obtained using the electrochemical technique as potentiodynamic polarization (PP), in a three-electrode system. The electrolytes used were sodium chloride (5 wt. % NaCl) and sulfuric acid (1 wt. % H2SO4). Passivation in citric acid allows obtain passive layers at temperatures of 49 degrees C with immersion times of 30 minutes. In precipitation hardening steels, passive layers up to 360 mV in sodium chloride. Can be obtained. In sulfuric acid, there is a mechanism of passivation - transpassivation - secondary passivation, this due to the high electropositive values of potential.
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