期刊
METALS
卷 11, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/met11040594
关键词
HSLA steel; dual-phase; passivity; EIS; polarisation; Mott– Schottky
资金
- Partnership Program of the Materials innovation institute M2i [F41.3.14546a]
The study found that the ferrite-martensite microstructure negatively affected the passive layer properties of low carbon steel, with the passive film formed on ferrite-pearlite microstructure showing better barrier properties. This was attributed to the higher donor density of the passive layer on ferrite-martensite samples.
The effect of ferrite-pearlite and ferrite-martensite phase combinations on the passive layer properties of low carbon steel is investigated in a 0.1 M NaOH solution. Heat treatments were designed to obtain ferrite-pearlite and ferrite-martensite microstructures with similar ferrite volume fractions. Potentiostatic polarisation and electrochemical impedance spectroscopy (EIS) results demonstrated the lower barrier properties of passive films on ferrite-martensite microstructure compared to the ones formed on ferrite-pearlite microstructure. This was attributed to the higher donor density of the passive layer on ferrite-martensite samples, measured with Mott-Schottky analysis. This behaviour was explained by the complex microstructure morphology of the martensite phase that led to the formation of a more defective passive film.
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