Manifestations in corrosion prophase of ultra-high strength steel 30CrMnSiNi2A in sodium chloride solutions

Abstract

The corrosion behaviors of ultra-high strength steel 30CrMnSiNi2A in sodium chloride solution were studied by weight loss and electrochemical methods. The morphology of corrosion products was observed using scanning electron microscopy(SEM) and the composition was analyzed using an energy dispersive spectroscopy(EDS) and X-Ray diffraction (XRD). The experimental results showed that the corrosion came from pitting corrosion and the rust layer was composed of outer rust layer γ-FeOOH and inner rust layer Fe₂O₃ with a little β-FeOOH. The correlation between corrosion rate and test time accorded with exponential rule. The corrosion current measured by polarization methods was higher than that calculated by weight loss method after a long-time immersion, the main reason was that β-FeOOH and γ-Fe₂O₃ transformed by γ-FeOOH led to overestimating corrosion rate. The processes of corrosion prophase were obtained from XRD and EIS results. The corrosion product, Fe(OH)₂ formed at the initial stage stayed at a non-steady state and then consequently transferred to γ-FeOOH, γ-Fe₂O₃ or β-FeOOH.

Keywords

30CrMnSiNi2A / ultra-high strength steel / sodium chloride / corrosion prophase

References

[1] Liu QB, Bai LF Effect of Laser Welding Technology Parameter s on Microstructure and Properties of Steel 30CrMniNi2A[J]. Mater. Eng., 2009, 1: 227-231.

[2] Li YJ, Wang J, Liu P Welding and Engineering Application of Lowalloy Steel[M], 2003 Beijing Industry Publ. 31-45.

[3] Wu HJ, Yao W, Huang FL Experimental Study on Dynamic Mechanical Properties of Ultrahigh Strength 30CrMnSiNi2A Steel[J]. Trans. Beijing Ins. Technol., 2010, 30(3): 258-263.

[4] Wan XR, Xu CG High Strength and Ultrahigh Strength Steel[M], 1988 8-18.

[5] Hua F, Liu XM, Wang CX Effect of Chemical Composition on Mechanical Properties of Steel 30CrMnSiNi2A[J]. J. Iron Steel Res., 2003, 15(3): 25-30.

[6] Chen FR, Huo LX, Zhang YF Effects of Electron Beam Local Post-weld Heat-treatment on the Microstructure and Properties of 30CrMnSiNi2A Steel Welded Joints[J]. J. Mater. Proc. Technol., 2002, 129: 412-417.

[7] Liu TQ Effect of Tempering Temperature on Structure and Mechanical Properties of Steel 30CrMnSiNi2A[J]. Spec. Steel., 2003, 24(2): 16-18.

[8] Li ZH Study on Optimization of Heat Treatment Process for 30CrMnSiNi2A Steel[J]. Mater & Heat Treat, 2008, 37(24): 97-100.

[9] Wu HJ, Yao W, Huang FL Experimental Investigation on Spall Fracture of 30CrMnSiNi2A Steel [J]. J. Beijing Inst. Technol., 2010, 19(1): 1-7.

[10] Liu DL, Yuan H, Tao CH Fracture Analysis of 30CrMnSiNi2A Steel Screw[J]. Fail. Anal. Prev., 2009, 4(3): 174-177.

[11] Zhang FZ, Ye XB, Song J Study on Crack Growth Behaviors of Three Kinds of Aeronautical Materials at 25 °C and -40 °C[J]. Acta Aeronaut. Etastron. Sin., 2007, 28(3): 593-595.

[12] Li CG, Yu Y Failure Analysis on Fracture of 30CrMnSiNi2A Steel Bolt Used for Wing Cover Plate[J]. Mater. Mechan. Eng., 2010, 34(10): 75-78.

[13] Wu N, Liang ZK, Wang GS Test on Susceptibility to Hydrogen Embrittlement for30CrMnSiNi2A [J]. HongDu Sci. Technol., 2009 27-32.

[14] Xue Z, Zhang ZM, Yu JM, . Research on Dynamic Yield Strength of Steel 30CrMnSiNi2A[J]. Ordnance Mater. Sci. Eng., 2009, 32(1): 10-14.

[15] He XF, Liu WT, Wang ZB Pre-Corrosion Degradation Infuluence on The Fatigue Life for 30CrMnSiNi2A Specimen[J]. J. Mechan. Strength., 2009, 31(4): 664-669.

[16] Li J, Zhang ZP, Sun Q A New Multi-axial Fatigue Damage Model for Various Metallic Materials under the Combnation of Tension and Torsion Loadings[J]. Int. J. Fat., 2009, 31: 776-781.

[17] Qian YR, He XD Temperature Effect and Overload Delayed Effect of Fatigue Crack Expansion in High Strength Steels [J]. Acta Metall. Sin., 1989, 25(6): 444-448.

[18] Qian YR, He XD Effects of Temperature and Overload Retardation on Corrosion Fatigue Crack Growth of High Strength Steel[J]. Acta Metall. Sin., 1990, 3(3): 204-207.

[19] Jin S, Zhu BH Fatigue Corrosion and Failure Mechanism of 30CrMnSiNi2A Steel While K _imax<K _iscc [J]. Acta Aeron. Etastron. Sin., 1988, 9(9): 466-474.

[20] Chen QZ, Yang RQ, Li GY Influence of Corrosion on Fatigue Life of 30CrMnSiNi2A Steel Structure[J]. Equip. Envir. Eng., 2007 7-10.

[21] Yu M, Dong Y, Wang RY, . Corrosion Behaviors of Ultra-high Strength Steel 23Co14Ni12Cr3Mo in Simulated Seawater Environment [J]. Mater. Eng., 2012, 1: 42-50.

[22] Yu M, Qi JY, Liu JH, . Corrosion Behaviors of Ultra-high Strength Steel 40CrNi2Si2MoVA in Simulated Seawater Full Immersed Environment [J]. Corros. Prot., 2011, 10: 779-781.

[23] Zou Y, Wang J, Zheng YY Electrochemical Techniques for Determining Corrosion Rate of Rusted Steel in Seawater[J]. Corros. Sci., 2011, 53: 208-216.

[24] Gao M, Pang X, Gao K The Growth Mechanism of CO2 Corrosion Product Films[J]. Corros Sci., 2011, 53: 557-568.

[25] Vedalakshmi R, Sarawathy V, Song WH, . Determination of Diffusion Coefficient of Chloride in Concrete Using Warburg Diffusion Coefficient[J]. Corros Sci., 2009, 51: 1 299-1 307.

[26] Collazo A, Novoa XR, Perez C, . EIS Study of the Rust Converter Effectiveness under Different Conditions[J]. Electrochim. Acta., 2008, 53: 7 565-7 574.

[27] Singh JK, Singh DD The Nature of Rusts and Corrosion Characteristics of Low Alloy and Plain Carbon Steels in Three Kinds of Concrete Pore Solution with Salinity and Different pH[J]. Corros. Sci., 2012, 56: 129-142.

[28] Li XG, Dong CF, Xiao K, . Initial Corrosion Behavior and Mechanism of Metals in Atmosphere Environment[M], 2009 56-58.