Effect of Cr on microstructure evolution and  corrosion resistance of pipeline steel

doi:10.13251/j.issn.0254-6051.2023.12.043

Abstract

Abstract: Three specimens of X80 steel with different Cr contents (mass fraction) of 1%, 2% and 3% were prepared by means of magnetron arc furnace, and the effects of Cr on microstructure and corrosion resistance were tested by means of SEM, DSC, electrochemical test, EDS and Raman characterization. The results show that the ferrite grain size decreases with the increase of Cr content, and the number of pearlite increases, and the change from the X80 steel to 2Cr steel is obvious. The value of impedance modulus |Z|_0.01Hz at low frequency 0.01 Hz increases with the increase of Cr content and decreases with the prolorgate of soaking time. When soaked in 3.5%NaCl solution for 1 day, the |Z|_0.01Hzvalue of the tested 3Cr steel is about 1315 Ω·cm², and that of the X80 steel is about 910 Ω·cm². When soaked for 14 days, the |Z|_0.01Hzvalue of the tested 3Cr steel is about 800 Ω·cm², and that of the X80 steel is about 470 Ω·cm². The corrosive medium and the corrosive reaction breaks down the steel surface and pitting pits can be seen clearly. Corrosion products are mainly composed of β-FeOOH, γ-FeOOH, α-FeOOH, Fe₃O₄ and Fe₂O₃, etc. Elevated Cr content, more and more stable phases of Fe₃O₄ and α-FeOOH appear on the steel surface, helping to enhance the stability of the corrosion product film.

Key words: pipeline steel, alloying element Cr, microstructure, corrosion product film

CLC Number:

Peng Haoping, Su Wei, Zhao Yonggang, Li Zhiwei, Su Xuping, Wu Changjun. Effect of Cr on microstructure evolution and corrosion resistance of pipeline steel[J]. Heat Treatment of Metals, 2023, 48(12): 260-268.

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Effect of Cr on microstructure evolution and corrosion resistance of pipeline steel

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