Effect of Additional Sulfide and Thiosulfate on Corrosion of Q235 Carbon Steel in Alkaline Solutions

Abstract

This paper investigated the effect of additional sulfide and thiosulfate on Q235 carbon steel corrosion in alkaline solutions. Weight loss method, scanning electron microscopy (SEM) equipped with EDS, X-ray photoelectron spectroscopy (XPS), and electrochemical measurements were used in this study to show the corrosion behavior and electrochemistry of Q235 carbon steel. Results indicate that the synergistic corrosion rate of Q235 carbon steel in alkaline solution containing sulfide and thiosulfate is larger than that of sulfide and thiosulfate alone, which could be due to redox reaction of sulfide and thiosulfate. The surface cracks and pitting characteristics of the specimens after corrosion were carefully examined and the corrosion products film is flake grains and defective. The main corrosion products of specimen induced by S2−and S2O32-are FeS, FeS2, Fe3O4, and FeOOH. The present study shows that the corrosion mechanism of S2−and S2O32-is different for the corrosion of Q235 carbon steel.

Effect of sulfur on corrosion behavior of Q235 and 16Mn steel in sodium aluminate solutions

“…The surface SEM images and composition of Q235 steel and 16Mn steel surface corrosive with different forms of sulfur are shown in figure 3. It can be seen that the surface SEM images of Q235 steel and 16Mn steel was almost similar from the low magnification diagram for different forms of sulfur and the corrosion of steel surface does not totally cover the metal and cannot be considered as a homogeneous layer but rather as a defective layer, the corrosion of two kinds of steel preferentially takes place at defect, which view consistent with the analysis before [10] and the literature [13]. The sample appeared terribly corroded after 120 h, but the surface profile can be observed to be greatly different from that of the original sample (figure 1) indicating the corrosion is accelerated.…”

“…The results indicate that S 2− was found to increase significantly the corrosion rate of steel and S 2 O 3 2− had no effect on the corrosion of steel. However, interaction between S 2− and S 2 O 3 2− is often referred to the corrosion of steel in the literature [9,10]. RAJAGOPAL SRIRAM discussed emphatically the influence of aluminate anion on the corrosion of steel, which indicates the presence of AlO 2 − species changes the deactivation kinetics [11].…”

Archives of Metallurgy and Materials

“…and indicates that the surface corrosion products of Q235 steel are mainly composed of FeS, FeS 2 , Fe 3 O 4 and FeOOh. This conclusion has been reported in literature [10].…”

“…Chen et al [3] studied the corrosion behavior of 16Mn steel in sulfide-containing Bayer liquid, and the results indicated that S 2anion increase significantly the corrosion rate of the steel and S 2 O 3 2anion had no effect on corrosion of the steel. however, there is the interaction between the coexistence of S 2and S 2 O 3 2in the solution, which is often referred to the corrosion of steel in the literature [9][10][11].…”

Probing the Anti-Corrosion Behavior of X65 Steel Underwater FSW Joint in Simulated Seawater

“…It shows that the corrosion resistance decreases with the extension of immersion time. In addition, the corrosion current density of FSW joint changed from 15.2 to 13.0 μA/cm 2 after being immersed for 24 h. Studies have shown that may be because the corrosion product film generated on the surface of the joint specimen hinders the corrosion reaction, thus reducing the corrosion current density Li et al, 2016).…”