Effects of Carbon Content and Microstructure on Corrosion Property of New Developed Steels in Acidic Salt Solutions

doi:10.1007/s40195-013-0007-1

Abstract

Abstract:

New steels with different carbon contents were self-developed by thermo-mechanical controlled processing. The effects of the carbon content and the microstructure on the corrosion properties of new steels were investigated by immersion test and SEM. The results indicated that the ferrite phase (both the proeutectoid and eutectoid ferrite) dissolved preferentially. Cementite reserved and accumulated on the surface. As carbon content increased, the content of ferrite decreased and cathode/anode area ratio increased. Therefore, the corrosion rate of new steels increased from 0.30 to 0.90 mm/years when the carbon content rose from 0.05 to 0.13 wt%. The corrosion process of new steels was studied using electrochemical impedance spectroscopy experiments during 72 h. It indicated that the impedance modulus |Z|_{0.01 Hz} of the new steels reduces with the increase of the immersion time. While the corrosion process of the new steel with 0.11 wt% C developed faster than that with 0.07 wt% C, although their |Z|_{0.01 Hz} was similar at the initial stage.

Key words: Carbon content, Microstructure, Corrosion behavior, Electrochemical impedance spectroscopy, SEM

Feilong Sun, Xiaogang Li, Xuequn Cheng. Effects of Carbon Content and Microstructure on Corrosion Property of New Developed Steels in Acidic Salt Solutions[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(1): 115-123.

Figures/Tables 9

Table 1 Compositions of the self-developed steels (wt%)

Sample no.	C	Si	Mn	P	S	Mo	Ni	Cu	Fe
1	0.05	0.28	1.52	0.006	0.009	0.064	0.32	0.33	Bal.
2	0.07	0.28	1.41	0.007	0.009	0.064	0.31	0.32	Bal.
3	0.09	0.27	1.34	0.007	0.009	0.065	0.32	0.32	Bal.
4	0.11	0.27	1.19	0.007	0.009	0.065	0.31	0.31	Bal.
5	0.13	0.27	1.13	0.007	0.009	0.062	0.32	0.32	Bal.

Fig. 1 Microstructures of the self-developed steels with different carbon contents. a 0.05 wt%, b 0.07 wt%, c 0.09 wt%, d 0.11 wt%, e 0.13 wt%

Fig. 2 The corrosion mass loss rate of the self-developed steels with different carbon contents after 72 h immersion test in 10 wt% NaCl solution with pH value of 0.85 at 30 ± 2 °C

Fig. 3 Surface micromorphologies observed by SEM of the self-developed steels with different carbon contents after 72 h immersion test in 10 wt% NaCl solution with pH value of 0.85 at 30 ± 2 °C. a, f 0.05 wt%, b, g 0.07 wt%, c, h 0.09 wt%, d, i 0.11 wt%, e, j 0.13 wt%

Fig. 4 The Nyquist plots a–e, Bode plots f–j of EIS of the self-developed steels with different carbon contents after 72 h immersion test in 10 wt% NaCl solution with pH value of 0.85 at 30 ± 2 °C. a, f 0.05 wt%, b, g 0.07 wt%, c, h 0.09 wt%, d, i 0.11 wt%, e, j 0.13 wt%

Fig. 5 Curves of |Z|0.01 Hz versus immersion time of the self-developed steels with different carbon contents in 10 wt% NaCl solution with pH value of 0.85 at 30 ± 2 °C

Fig. 6 Micromorphologies a–h, curves of |Z|0.01 Hz versus immersion time (i) of the self-developed steels with 0.07 and 0.11 wt% carbon contents after immersion for different time in 10 wt% NaCl solution with pH value of 0.85 at 30 ± 2 °C. a 0.07 wt%, 1 h; b 0.11 wt%, 1 h; c 0.07 wt%, 4 h; d 0.11 wt%, 4 h; e 0.07 wt%, 8 h; f 0.11 wt%, 8 h; g 0.07 wt%, 12 h; h 0.11 wt%, 12 h; i curves of |Z|0.01 Hz versus immersion time

Fig. 7 The integration diagram of the curve of |Z|0.01 Hz versus time of the self-developed steel with 0.05 wt% carbon content

Fig. 8 The average value of |Z|0.01 Hz of the self-developed steels with different carbon contents in 10 wt% NaCl solution with pH value of 0.85 at 30 ± 2 °C

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