Effect of the frequency of high-angle grain boundaries on the corrosion performance of 5wt%Cr steel in a CO₂ aqueous environment

Abstract

The corrosion behavior of 5wt%Cr steel tempered at different temperatures was investigated by immersion testing and electrochemical testing in a CO₂ aqueous environment. When the tempering temperature exceeded 500°C, the corrosion rate increased. The corrosion layers consisted of Cr-rich compounds, which affected the corrosion behaviors of the steels immersed in the corrosive solution. The results of electrochemical experiments demonstrated that 5wt%Cr steels with different microstructures exhibited pre-passivation characteristics that decreased their corrosion rate. Analysis by electron back-scattered diffraction showed that the frequency of high-angle grain boundaries (HAGBs) and the corrosion rate were well-correlated in specimens tempered at different temperatures. The corrosion rate increased with increasing HAGB frequency.

Keywords

chromium steel / grain boundaries / microstructure / corrosion performance / tempering temperature

References

[1] Sun J.B., Liu W., Lu M.X. Investigation progress of effect of alloying elements and microstructure on CO₂ corrosion behavior of steel. J. Chin. Soc. Corros. Prot., 2008, 28(4): 246.

[2] Li W., Xu L.N., Qiao L.J., Li J.X. Effect of free Cr content on corrosion behavior of 3Cr steels in a CO₂ environment. Appl. Surf. Sci., 2017, 425, 32.

[3] Liu W., Lu S.L., Zhang P., Dou J.J., Zhao Q.H. Effect of silty sand with different sizes on corrosion behavior of 3Cr steel in CO₂ aqueous environment. Appl. Surf. Sci., 2016, 379, 163.

[4] Lin X.Q., Liu W., Wu F., Xu C.C., Dou J.J., Lu M.X. Effect of O2 on corrosion of 3Cr steel in high temperature and high pressure CO₂–O2 environment. Appl. Surf. Sci., 2015, 329, 104.

[5] Sun C., Wang Y., Sun J.B., Lin X.Q., Li L.D., Liu H.F., Cheng X.K. Effect of impurity on the corrosion behavior of X65 steel in water-saturated supercritical CO₂ system. J. Supercrit. Fluids, 2016, 116, 70.

[6] Zhang G.A., Lu M.X., Wu Y.S. Morphology and microstructure of CO₂ corrosion scales. Chin. J. Mater. Res., 2005, 19(5): 537.

[7] Liu Z.G., Gao X.H., Du L.X., Li J.P., Yu C., Misra R.D.K., Wang Y.X. Comparison of corrosion behaviors of low-alloy pipeline steel exposed to H₂S/CO₂-saturated brine and vapour-saturated H₂S/CO₂ environments. Electrochim. Acta, 2017, 232, 528.

[8] Yu H., Zhang D.D., Xiao R.T., Zhou P., Dong J.J., Du X.B. Effect of tempering temperature on low angle grain boundaries in Q960 steel. J.^Univ. Sci. Technol. Beijing, 2011, 33(8): 952.

[9] Hunag R., Han Y. The effect of SMAT-induced grain refinement and dislocations on the corrosion behavior of Ti-25Nb-3Mo-3Zr-2Sn alloy. Mater. Sci. Eng. C, 2013, 33(4): 2353.

[10] Song D., Ma A.B., Jiang J.H., Lin P.H., Yang D.H., Fan J.F. Corrosion behaviour of bulk ultra-fine grained AZ91D magnesium alloy fabricated by equal-channel angular pressing. Corros. Sci., 2011, 53(1): 362.

[11] Örnek C., Engelberg D.L. SKPFM measured Volta potential correlated with strain localisation in microstructure to understand corrosion susceptibility of cold-rolled grade 2205 duplex stainless steel. Corros. Sci., 2015, 99, 164.

[12] Liang J.M., Tang D., Wu H.B., Zhang P.C., Liu W., Mao H.Y., Liu X.T. Corrosion behaviors of Cr low-alloy steel in bottom plate environment of cargo oil tanks. J.^South China Univ. Technol. Nat. Sci., 2013, 41(10): 72.

[13] Liang J.M., Tang D., Wu H.B., Wang L.D. Environment corrosion behavior of cargo oil tank deck made of Cr-contained low-alloy steel. J. Southeast Univ. Nat. Sci., 2013, 43(1): 152.

[14] Townsend H.E. Effects of alloying elements on the corrosion of steel in industrial atmospheres. Corrosion, 2001, 57(6): 497.

[15] Nishimura T., Katayama H., Noda K., Kodama T. Effect of Co and Ni on the corrosion behavior of low alloy steels in wet/dry environments. Corros. Sci., 2000, 42(9): 1611.

[16] Xu L.N., Wang B., Zhu J.Y., Li W., Zheng Z.Y. Effect of Cr content on the corrosion performance of low-Cr alloy steel in a CO₂ environment. Appl. Surf. Sci., 2016, 379, 39.

[17] Qian Y.H., Ma C.H., Niu D., Xu J.J., Li M.S. Influence of alloyed chromium on the atmospheric corrosion resistance of weathering steels. Corros. Sci., 2013, 74(4): 424.

[18] Ghosh C., Basabe V.V., Jonas J.J., Kim Y.M., Jung I.H., Yue S. The dynamic transformation of deformed austenite at temperatures above the Ae3. Acta Mater., 2013, 61(7): 2348.

[19] Yamashita M., Miyuki H., Matsuda Y., Nagano H., Misawa T. The long-term growth of the protective rust layer formed on weathering steel by atmospheric corrosion during a quarter of a century. Corros. Sci., 1994, 36(2): 283.

[20] Wang B., Xu L.N., Zhu J.Y., Xiao H., Lu M.X. Observation and analysis of pseudo-passive film on 6.5%Cr steel in CO₂ corrosion environment. Corros. Sci., 2016, 111, 711.

[21] Guo S.Q., Xu L.N., Zhang L., Chang W., Lu M.X. Corrosion of alloy steels containing 2% chromium in CO₂ environments. Corros. Sci., 2012, 63, 246.

[22] Liu Z.G., Gao X.H., Du L.X., Li J.P., Kang Y., Wu B. Corrosion behavior of low-alloy steel with martensite/ferrite microstructure at vapor-saturated CO₂ and CO₂-saturated brine conditions. Appl. Surf. Sci., 2015, 351, 610.

[23] Xu L.N., Wang B., Lu M.X. Corrosion behavior of 6.5%Cr steel in high temperature and high pressure CO₂ environment. Acta Metall. Sinica, 2016, 52(6): 672.