电偶效应对与30CrMnSiA钢耦合的7B04铝合金当量折算系数的影响

doi:10.7527/S1000-6893.2017.421358

Abstract

Abstract: The potentiodynamic polarization technique was used to measure the polarization curves of 7B04 aluminum alloy and 30CrMnSiA steel in different concentration of NaCl solution and aqueous media. The galvanic current of 7B04 aluminum alloy contacted with 30CrMnSiA steel in NaCl solution with different concentrations and different area ratios were calculated by numerical simulation and electrochemical experiment. Micromorphology of 7B04 aluminum alloy coupled with 30CrMnSiA steel or not after corrosion was observed by Scanning Electron Microscopy (SEM). Based on the equivalent conversion coefficient method, while the mathematical model was established by using the polarization curve as the boundary condition, the equivalent conversion coefficient of 7B04 aluminum alloy coupled with 30CrMnSiA steel in NaCl solution with different concentrations, aqueous media, and different area ratios of cathode to anode were investigated. Results show that the increase of Cl^- concentration and cathode area can aggravate galvanic corrosion, and the ratio of anode to cathode area was more intense comparatively. Furthermore, the 7B04 aluminum alloy after being coupled with 30CrMnSiA steel accelerated corrosion, and the equivalent conversion coefficient of 7B04 aluminum alloy in NaCl solution with different concentrations and aqueous media tended to decrease to different degrees.

Key words: 7B04 aluminum alloy, 30CrMnSiA steel, galvanic action, electrochemical properties, numerical simulation, equivalent conversion coefficient

CLC Number:

TG172.2
V252

CHEN Yueliang, ZHAO Hongjun, BIAN Guixue, ZHANG Yong. Influence of galvanic action on equivalent conversion coefficient of 7B04 aluminum alloy coupled with 30CrMnSiA steel[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(12): 421358-421358.

References

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Influence of galvanic action on equivalent conversion coefficient of 7B04 aluminum alloy coupled with 30CrMnSiA steel

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