The effect of microstructure and non-metallic inclusions on corrosion behavior of low carbon steel in chloride containing solutions

Corrosion Resistance and Pitting Behaviour of Low-Carbon High-Mn Steels in Chloride Solution

“…8d). The results of SEM observation and EDS analysis confirmed our earlier results [16] and supports the data reported by other authors [6][7][8][9][10]. It means that corrosion pits are initiated mainly at non-metallic inclusions such as MnS, AlN and at complex oxysulphides.…”

“…It has been reported [16][17][18] that elements such as manganese and sulfur have a negative influence on the corrosion resistance of high-Mn steels. Manganese combines with sulfur creating MnS inclusions, which are vulnerable for pitting corrosion attack [6][7][8][9][10]19]. Schmuki et al [7] found that for the stainless steels pitting corrosion during immersion in a 10% FeCl 3 solution always started at MnS inclusions.…”

“…Presence of MnS inclusions drastically increases corrosion current density and shifts corrosion potential to more negative values. Shibaeva et al [10] reported that in the passive state, steels with higher sulfur content possess worse passivation and more narrow potential range of the passive state. Experimental observations indicate in many cases that corrosion pits initiate at the inclusion/matrix boundaries.…”

Effect of Nd3+ Ion Concentration on the Corrosion Resistance of API X70 Steel in Chloride‐Rich Environments

“…It is known that depending on the manufacturing conditions and thermal treatments to which an X70 steel is subjected, its microstructure can be formed by the presence of different phases, the main being the polygonal ferrite, quasipolygonal ferrite, Widmanstätten ferrite, acicular ferrite, bainitic granular ferrite, bainite ferrite, martensite in addition to the presence of precipitates (Nb(CN), Fe 3 C, MnS, and SiO 2 ) [33][34][35]. is combination of phases can favor a galvanic effect between them, causing the corrosion of the electrochemically less stable phase, generally the ferrite [36], in addition to a nonuniform distribution of the local anodic/cathodic ratio that favors localized corrosion [37].…”

Electrochemical Corrosion Performance of Low Alloy Steel in Acid Sodium Chloride Solution

“…Now, the corrosion resistant properties of alloy steel have been studied, obtaining some achievements, major consideration with respect to atmospheric corrosion, [1][2][3][4] marine corrosion [5][6][7][8] and the corrosion for some special environments. [9][10][11][12] However, very few studies on the corrosion behavior of COT steel have been reported. [13][14][15] The evaluation methods of corrosion resistance have been widely concerned.…”