不同液膜厚度下电偶腐蚀当量折算研究

doi:10.11896/j.issn.1005-023X.2018.09.024

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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.

Key words： liquid film equivalent conversion galvanic corrosion corrosion simulation

Published: 10 May 2018 Online: 2018-07-06

CLC number:	TG172.2
	V252

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	Articles by authors
	CHEN Yueliang
	HUANG Hailiang
	ZHANG Yong
	BIAN Guixue
	WANG Chenguang
	WANG Andong

Cite this article:

CHEN Yueliang,HUANG Hailiang,ZHANG Yong, et al. Study on Equivalent Conversion of Galvanic Corrosion Under Different Liquid Film Thickness[J]. Materials Reports, 2018, 32(9): 1571-1576.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.09.024 OR https://www.mater-rep.com/EN/Y2018/V32/I9/1571

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