Influence of plastic deformation and Cu addition on corrosion of carbon steel in acidic aqueous solution

Effects of Ti and Cu Addition on Inclusion Modification and Corrosion Behavior in Simulated Coarse-Grained Heat-Affected Zone of Low-Alloy Steels

“…Additionally, the accumulated iron sulfide could promote the uniform dissolution of the steel matrix in Cl − containing solution [ 46 ], whereas the enrichment of Cu was observed in the anodic corrosion region of Cu-bearing sample ( Figure 9 c). As reported earlier, the solubilized Cu in the steel matrix can deposit on the steel surface during the steel matrix dissolution process and then enhance the compactness of the rust layers and suppress the anodic reactions [ 18 , 47 ]. Thus, the local corrosion current density of Cu-bearing sample was lowered by Cu-enriched rust layer ( Figure 8 ).…”

“…Although the interface density in Cu-bearing steel was higher than that in base steel, the corrosion rate of Cu-bearing steel was similar to the base steel ( Table 4 ). According to EDS results shown in Figure 9 , the solubilized Cu in the steel matrix deposited on the surface of the anodic corrosion region, which considerably suppressed the anodic reaction [ 18 ], resulting in the improvement of corrosion resistance.…”

“…However, the addition of alloying elements can significantly affect the corrosion resistance of the steel, owing to its influence on protective rust layer formation, inclusion number density, size distribution, and chemical composition [ 18 , 19 , 20 ]. In Cu and Cr containing steel, an elemental Cu- and Cr-enriched layer would generate on the steel surface, this compact rust layer can significantly inhibit both anodic and cathodic reactions, lowering the corrosion rate of steel [ 18 , 19 , 21 ]. With the addition of alloying elements, such as S and Al, the number density and average size of MnS, MnO, and Al 2 O 3 obviously increased, which would lead to the decrease of corrosion resistance [ 20 , 22 , 23 ].…”

Influence of external tensile stress on corrosion and trench formation of low alloy steel in a low H2S content sour corrosion environment

“…It has been reported that plastic strain introduced into low alloy steels promotes corrosion in acidic environments. [33][34][35][36] For example, Huang et al [33] investigated the corrosion properties of steels with various cold workability by electrochemical measurement and showed that increasing the cold workability of the material also increased the corrosion current density. The mechanism of the influence of plastic strain on corrosion is mainly classified into the promotion effect [37] of the hydrogen evolution reaction by increasing hydrogen absorption, and the dissolution activation effect [38] by lattice defects (terrace-ledge-kink model).…”

Influence of dislocation on sour corrosion of carbon steel in a low H2S sour environment

“…With regard to the latter, from the viewpoint of the mechanochemical reaction of steel, it has been widely known since the beginning of the 20th century that plastic strain promotes corrosion. [ 22–30 ] The mechanism of the effect of plastic strain on corrosion is interpreted as the effect of an increasing dislocation density, which is roughly divided into the effect of promoting the hydrogen evolution reaction by increasing hydrogen absorption [ 29 ] and the effect of activation of dissolution by lattice defects (terrace–ledge–kink model). [ 31,32 ] However, the mechanism of localized corrosion (trenching) under external stress has not been sufficiently validated and no conclusion has yet been reached.…”