Influence of Rust Layers on the Corrosion Behavior of Ultra-High Strength Steel 300M Subjected to Wet-Dry cyclic Environment with Chloride and Low Humidity

doi:10.1007/s40195-014-0174-8

Abstract

Abstract:

The influence of rust layers on the corrosion behavior of ultra-high strength steel 300M subjected to a simulated coastal atmosphere was investigated by corrosion weight loss, surface analysis techniques, and electrochemical methods. The results exhibit the presence of a large proportion of γ-FeOOH and α-FeOOH and a small amount of Fe₃O₄ in the outer rust layer. During the wet-dry cyclic process, the bonding performance and the density of outer rust layer deteriorate with the thickness of outer rust. The inner rust layer plays a main role on protectiveness, which can be attributed to the formation of an ultra-dense and adherent rust film with major constituent of α-FeOOH and α-Fe₂O₃ on the steel.

Key words: Ultra-high strength steel, Wet-dry, Chloride, Corrosion, Rust

Qiang Guo, Jian-Hua Liu, Mei Yu, Song-Mei Li. Influence of Rust Layers on the Corrosion Behavior of Ultra-High Strength Steel 300M Subjected to Wet-Dry cyclic Environment with Chloride and Low Humidity[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(2): 139-146.

Figures/Tables 13

Fig. 1 Corrosion weight loss of 300M with different CCT cycles in the wet-dry cyclic environment

Fig. 2 Corrosion rate of 300M with different CCT cycles in the wet-dry cyclic environment

Fig. 3 OM cross-sectional morphology of rust layers on 300M exposed for 144 cyc CCT

Fig. 4 The surface morphology of outer rust after different CCT cycles: a 144 cyc; b 240 cyc; c 480 cyc; d 720 cyc

Fig. 5 The surface morphology of inner rust after different CCT cycles: a 144 cyc; b 240 cyc; c 480 cyc; d 720 cyc

Fig. 6 XRD pattern of outer rust on steel 300M exposed for 480 CCT cycles

Fig. 7 Raman spectra of inner a and outer b rust layers on 300M exposed for 480 CCT cycles

Fig. 8 Open circuit potential of rusted steel 300M exposed for different CCT cycles

Fig. 9 EIS diagrams of rusted steel 300M exposed for different CCT cycles: a Nyquist plots; b Bode plots of log|Z| versus logf; c Bode plots of -Phase angle versus logf

Fig. 10 Equivalent circuit diagram for EIS diagrams of rusted steel 300M exposed for different CCT cycles

Table 1 Simulated results of EIS diagrams for different corrosion times

CCT cycle	C _out (10^-8F/cm²)	R _out (Ω/cm²)	C _in (10^-6F/cm²)	R _in(Ω/cm²)	Q (F/cm²)	n	R _ct(Ω/cm²)	W(Ω/cm²)
144	4.26242	54.10191	15.121	5.75541	0.00511	0.76089	15.83439	0.01855
240	1.13682	61.47771	9.52994	7.56178	0.00345	0.76994	17.41401	0.01857
360	1.25452	81.74522	2.44586	13.1465	0.0016	0.75643	20.33121	0.01832
480	2.71592	53.73248	1.93631	14.44586	0.0013	0.74344	22.63694	0.01806
600	1.0679	84.36943	1.96051	15.7707	0.00141	0.74917	23.09554	0.01833
720	1.04611	88.12739	1.61274	18.15287	0.00205	0.66255	33.69427	0.02242

Fig. 11 The variation of R out (a), R in (b), R ct (c), and W (d) obtained from EIS diagrams of steel 300M with different CCT cycles

Fig. 12 Potentiodynamic polarization curves of rusted steel 300M exposed for different CCT cycles

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