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| Effects of H2O2 Addition on Corrosion Behavior of High-strength Low-alloy Steel in Seawater |
| YANG Chao1,2, ZHANG Huixia2, GUO Weimin2, FU Yubin1 |
1. Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100,China;
2. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266101, China |
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Abstract The corrosion behavior of high-strength low-alloy steel in natural seawater without and with 0.01 mol/L H2O2 was investigated by electrochemical polarization, Raman spectroscopy, X-ray diffraction (XRD) and rotating ring-disk electrode (RDE) experiment. The corrosion mechanism of the steel in each solution was discussed. The results showed that the free corrosion potential and limited diffusion current density of the steel increased obviously due to the addition of H2O2 in seawater, meanwhile the hydrogen-evolution potential also shifted negatively. The phase constituents of the rust layer in two solutions were almost the same, and the oxygen reduction process of the steel in two solutions was controlled by the two-electronic reaction. In conclusion, the addition of H2O2 could efficiently accelerate the corrosion rate of the steel in natural seawater, but could not change its corrosion mechanism.
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