Pitting Initiation and Propagation of X70 Pipeline Steel Exposed to Chloride-Containing Environments
AbstractInclusion-induced pitting initiation mechanisms in X70 steel were investigated by scanning electron microscopy, scanning Kelvin probe force microscopy (SKPFM), immersion and electrochemical polarization tests in chloride-containing ion solutions. There are three inclusion types in the X70 steel. Corrosion test results indicated that pitting corrosion resistance of type A inclusion < type C inclusion < type B inclusion, i.e., (Mn, Ca)S < matrix < (Al, Ca)O. SKPFM test results show that the type A inclusion exhibited both lower and higher potentials than the matrix, while the type B inclusion exhibited higher potential than the matrix. The corrosion test and the SKPFM potential test results are consistent. Potentiodynamic polarization results indicate that the type A and C are active inclusions, while the type B is an inactive inclusion. Three kinds of possible mechanisms of inclusion-induced pitting corrosion are established for the X70 steel. View Full-Text
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Yang, Z.; Kan, B.; Li, J.; Su, Y.; Qiao, L.; Volinsky, A.A. Pitting Initiation and Propagation of X70 Pipeline Steel Exposed to Chloride-Containing Environments. Materials 2017, 10, 1076.
Yang Z, Kan B, Li J, Su Y, Qiao L, Volinsky AA. Pitting Initiation and Propagation of X70 Pipeline Steel Exposed to Chloride-Containing Environments. Materials. 2017; 10(9):1076.Chicago/Turabian Style
Yang, Zixuan; Kan, Bo; Li, Jinxu; Su, Yanjing; Qiao, Lijie; Volinsky, Alex A. 2017. "Pitting Initiation and Propagation of X70 Pipeline Steel Exposed to Chloride-Containing Environments." Materials 10, no. 9: 1076.
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