| Citation: | CHEN Yueliang, WANG Andong, BIAN Guixue, et al. Simulation of galvanic corrosion of three electrodes in marine environment[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(9): 1808-1817. doi: 10.13700/j.bh.1001-5965.2017.0670(in Chinese)
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To study the galvanic corrosion behavior of three electrodes, polarization curves of CF8611/AC531 composite (CFRP), 7B04-T74 aluminum alloy (7B04) and galvanized 30CrMnSiA steel (GSB) were measured. Full immersion test of the lap joint in the simulated marine environment was carried out. The circular three electrodes were designed, the steady-state corrosion field and the parameter scanning equation were deduced, and the galvanic corrosion model of the three electrodes and the lap joint were established. The results show that the potential distribution in the steady-state corrosion field accords with the Laplace equation. CFRP with the highest potential is cathode; GSB with the lowest is anode; the cathode or anode role of 7B04 is not fixed, it varies with the area of arbitrary electrode, and the critical area ratio is given out. The galvanic current of each electrode obeys the exponential distribution, and the correlation coefficient is approximately 1, which indicates a high fitting precision. On the lap joint, the potential and current density at the overlap are the highest and they descend symmetrically to both ends. 7B04 and GSB are anodes and the current density of them increases by about 210 and 328 times separately. This shows that the galvanic corrosion effect made by CFRP is very significant. The corrosion type of 7B04 plate at the overlap is general corrosion, and the thickness of about 1.011% loses. The simulation value of the distance of the pitting sensitive area is 3.9-7.6 mm and the measured value is 4.667-8.872 mm. The range, shape and change rule of the two are in good agreement. This illustrates that the model is effective and reliable.
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