| CORROSION AND PROTECTION OF MATERALS |
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| Study on Equivalent Conversion of Galvanic Corrosion Under Different Liquid Film Thickness |
| CHEN Yueliang, HUANG Hailiang, ZHANG Yong, BIAN Guixue, WANG Chenguang, WANG Andong
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| Naval Aeronautical Engineering Institute Qingdao Campus, Qingdao 266041 |
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Abstract The polarization curves and galvanic currents of 2024 aluminum alloy and TA15 titanium alloy under different thickness of 3.5wt% NaCl liquid film were measured and the electrochemical kinetic parameters of two kinds of materials under different thickness liquid membranes were determined by applying a liquid membrane thickness measurement apparatus and a three-electrode system with backward inserted micro-distance reference eletrode. To obtain the galvanic current under different liquid film thickness and equivalent conversion factor of galvanic-non galvanic corrosion. The Comsol corrosion simulation model based on the shell current distribution was established.The result manifested that the galvanic current value obtained by the simulation model agreed well with the experimental data, under the thickness of 50 μm liquid film, the galvanic current was about 25 times of that of the solution, with the increase of liquid film thickness, the decrease speed of galvanic current increased gradually. When the liquid film thickness reaches 1 000 μm, the galvanic current approached the solution state,the conversion coefficient of galvanic corrosion at 50 μm and 100 μm liquid film thickness was about 5 times of that without galvanic couple. When the liquid film thickness was more than 100 μm, the conversion coefficient dropped sharply. When the liquid film thickness was 1 000 μm, whether there was galvanic corrosion or not, the conversion coefficient basically tended to 1.
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Published: 06 July 2018
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2018, Vol. 32 
