| METALS AND METAL MATRIX COMPOSITES |
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| Study on Comparison of Multi-metal Coupled Corrosion Behavior Under the State of Atmosphere and Solution and Equivalent Conversion Calculation |
| HUANG Hailiang, CHEN Yueliang, ZHANG Yong, BIAN Guixue, WANG Chenguang, WU Xingjun
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| Naval Aviation University (Qingdao Campus), Qingdao 266041, China |
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Abstract The thin liquid film thickness measurement and electrochemical measurement device were improved, and the solution electrochemical mea-surement platform was built. The polarization curves of 7050 aluminum alloy, Aermet100 high strength steel, 1Cr18Ni9Ti stainless steel and QA110-4-4 copper alloy in the aircraft material system were measured. The galvanic current of each electrode surface in the four-electrode system is constructed. The Comsol simulation model based on the secondary current distribution and the shell current distribution is constructed respectively, and the potential and current density distribution under the solution state and 100 μm liquid film are obtained. The relationship between corrosion morphology and simulated potential distribution under the state of atmosphere and solution was compared and analyzed. The galvanic current was obtained by calculating the local current area of each electrode surface, and compared with the current value obtained by the test. The potential distribution of the multi-electrode surface in the liquid film state is much larger than that in the solution state. Comparing the corrosion morphology and the simulated potential distribution, it can be seen that the surface of electrode has different degrees of corrosion damage,whose simulated surface potential distribution is higher than its self-corrosion potential, but other surface of electrode whose surface potential distribution is below the self-corrosion potential is not obvious, which proves the accuracy of the model for potential distribution prediction. Both Aermet 100 steel and 7050 aluminum alloy act as the anodes of multi-electrode system under the condition of thin liquid film, and they have a competitive relationship. Therefore, the number of corrosion pits and surface galvanic current of aluminum alloy under the liquid film state are lower than those under the solution state. Copper alloy and stainless steel act as cathodes in the multi-electrode system regardless of liquid film state or solution state, and the polarity does not change. According to the equivalent principle of corrosion damage, the conversion coefficients of different area ratios of 7050 aluminum alloy and Aermet100 high strength steel under solution state and liquid film state are calculated. It has certain reference va-lue for the selection of the conversion coefficient in the accelerated environmental spectrum widely used in aircraft environmental adaptability assessment.
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Published: 15 January 2020
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| About author:: Hailiang Huanghas been pursuing a doctoral degree at the Naval Air University Qingdao Campus Since March 2016, mainly engaged in aircraft corrosion protection and strength design. Published many articles in SCI and EI journals on corrosion simulation;Yueliang Chenis a professor and doctoral tutor at the Qingdao University Campus of the Naval Aeronautical University. He has presided over more than 20 national natural science funds, national defense 973 and military research projects, published 2 monographs and 8 military standards, mainly engaged in aircraft structural strength and corrosion protection. More than 100 articles have been published in important journals at home and abroad. |
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2020, Vol. 34 
