Influence of Direct Current Electric Field on the Formation, Composition and Microstructure of Corrosion Products Formed on the Steel in Simulated Marine Atmospheric Environment

doi:10.1007/s40195-016-0397-y

Abstract

Abstract:

X-ray diffraction, Raman spectroscopy and scanning electron microscopy were employed to investigate the effects of the DC electric field on the composition, formation and structure of corrosion products formed on the surface of the steel immersed in NaCl solution. The results show that goethite (α-FeOOH), akaganeite (β-FeOOH), lepidocrocite (γ-FeOOH) and magnetite (Fe₃O₄) are the major constituents among the corrosion products. The arrangement of different levels of the DC electric field intensity gives rise to the following results. The little higher DC electric field intensity (around 100-200 kV/m) promotes the crystallinity and growth of γ-FeOOH; obviously, much higher DC electric field intensity (greater than 400 kV/m) prevents the growth of α-FeOOH and facilitates the generation of Fe₃O₄. Both the promotional growth of γ-FeOOH and suppression of α-FeOOH growth indicated the weakness of the protectiveness of the rust layer. Consequently, the suppression of the transformation of α-FeOOH from γ-FeOOH favors the yield of the Fe₃O₄, which works as a large cathode area and would be about to quicken the subsequent steel corrosion.

Key words: Steel, Atmospheric, corrosion, Rust, Electric, field, Raman, spectroscopy

Nian-Wei Dai, Jun-Xi Zhang, Qi-Meng Chen, Xin Zhang, Fa-He Cao, Jian-Qing Zhang. Influence of Direct Current Electric Field on the Formation, Composition and Microstructure of Corrosion Products Formed on the Steel in Simulated Marine Atmospheric Environment[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(4): 373-381.

Figures/Tables 10

Table 1 Chemical compositions of the steel tested (in wt%)

C	Si	Mn	S	P	Cr	Ni	Cu	Fe
0.06	0.014	1.16	0.005	0.019	0.38	0.16	0.24	Bal.

Fig. 1 Brief diagram of the substrate specimen

Fig. 2 Schematic diagram of self-designed chamber for exposure experiments under the DC electric field

Table 2 Location of the specimens and corresponding solution medium

Location	DC electric field intensity (kV/m)	Number of the specimens	Solution medium
Board B (0 kV)	Blank (0)	1	NaCl
Board A (5 kV)	100	2	NaCl
Board A (10 kV)	200	3	NaCl
Board A (20 kV)	400	4	NaCl

Fig. 3 Weight loss of the steels exposed under different DC electric field intensities

Fig. 4 Picture of the specimens immersed in NaCl solution for 1 week: a blank (0 kV/m), b 100 kV/m, c 200 kV/m,d 400 kV/m

Fig. 5 XRD patterns of the products formed on the specimens in NaCl solution under different DC electric field intensities: a blank (0 kV/m), b 100 kV/m, c 200 kV/m, d 400 kV/m

Fig. 6 Raman spectra of the rusts formed on the specimens in NaCl solution under different DC electric fields: ablank (0 kV/m), b 100 kV/m, c 200 kV/m, d 400 kV/m (filled circle γ-FeOOH, filled diamond α-FeOOH, filled square β-FeOOH, filled star α-Fe2O3, open circle Fe3O4)

Fig. 7 SEM images of typical corrosion products formed on the steels immersed in NaCl solution: a cotton balls and plate-like products, b needle-like and amorphous products

Fig. 8 SEM images of major corrosion products formed on surface of the steels under different levels of DC electric field intensity: a blank (0 kV/m), b 100 kV/m, c 200 kV/m, d 400 kV/m

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