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还有这三段 谢谢了
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The polarization behaviour of CRS in 1.0 M H2SO4 in the absenceand presence of different concentrations of iso-vanillin and Ce4+ at 20 °C is shown in Fig. 4. The potentiodynamic polarization parameters are shown in Table 1. It is clear that the presence of single 100 mg l−1 iso-vanillin causes a decrease in the corrosion rate i.e. it shifts the cathodic curve to more negative potential. The inhibitor has a significant effect on the rate of hydrogen evolution reaction. On the other hand, the inhibitor has a slight effect on the anodic curves. It may be concluded that single iso-vanillin acts as a cathodic-type inhibitor in 1.0MH2SO4. Table 1 reveals that the corrosion current (Icorr) decreases and there is a moderate IE in the presence of 100 mg l−1 iso-vanillin. The corrosion potential (Ecorr) does not change obviously. Both the cathodic Tafel slopes (bc) and the anodic Tafel slopes (ba) do not change obviously, which indicates that the mechanism of the corrosion reaction does not change and the corrosion reaction is inhibited by a simple adsorption mode. It can be seen from Fig. 4 that the cathodic reaction of electrode is slightly inhibited by the presence of Ce4+, while the anodic reaction is not inhibited compared with the blank. Table 1 shows that Icorr decreases slightly and there is a poor IE in the presence of 400 mg l−1 Ce4+. In addition, Ecorr does not change obviously. Both bc and ba do not change obviously, which indicates that the mechanism of the corrosion reaction of steel does not change. Fig. 4 clearly shows that both anodic and cathodic reactions are drastically inhibited, which indicates the iso-vanillin/Ce4+ mixture acts as a mixed-type inhibitor [25]. The complex of 100 mg l−1 iso-vanillin– 400 mg l−1 Ce4+ causes Ecorr to shift to the anodic direction. Both bc and ba do change obviously, and Icorr decreases remarkably. The inhibition efficiency calculated from corrosion current density reaches a considerable value (95.3%). |
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