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首页> 外文会议>Proceedings vol.2004-14; Electrochemical Society(ECS) International Meeting and Symposium on Corrosion in Marine and Saltwater Environments II; 20041003-08; Honolulu,HI(US) >ENHANCEMENT OF ELECTRIC CONDUCTIVITY OF THE RUST LAYER ON WEATHERING STEELS BY WATER ADSOPTION
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ENHANCEMENT OF ELECTRIC CONDUCTIVITY OF THE RUST LAYER ON WEATHERING STEELS BY WATER ADSOPTION

机译：吸水增强风化钢壳层的导电性

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摘要

The rust layers on the weathering steels exposed for 17 or 18 yeas at seven different sites in Japan were studied by electrochemical impedance under wet conditions and the measurement of the amount of water vapor adsorbed. From the semi-infinite model of diffusion of adsorbed water of which the amount was measured by in-situ mass change during the water adsorption in the rust layer, apparent diffusion coefficients of water in the rust were calculated. It was found the apparent diffusion coefficient in the rust increased with increasing amount of air-borne salt of exposure sites. The impedance showed that the rust layer behaved as a dielectric layer under a dry condition, however, the conductance was greatly enhanced by wetting. The charge transfer resistance evaluated from the simulation under wet condition was largely dependent of the amount of air-borne salt in environment. It was concluded that the wetted rust layer formed at any sites with a relatively large amount of air-borne salt revealed higher conductivity under solely wet condition. The rust formation followed the Evans rust model during wet-dry cycles. Higher conductivity from salt deposits promoted more active reduction of the rust layer under a wet condition and larger growth of the rust layer in an alternating wet-dry cycles.
机译：通过在潮湿条件下的电化学阻抗和测量吸附的水蒸气量，研究了在日本七个不同地点暴露17或18年的耐候钢上的锈层。根据通过在锈层中吸水期间的原位质量变化来测量吸附水的扩散的半无限模型，可以计算出水在锈中的表观扩散系数。发现随着暴露部位空气中盐分含量的增加，铁锈中的表观扩散系数也增加。阻抗表明，在干燥条件下，锈层表现为电介质层，但是，通过润湿，电导率大大提高。在潮湿条件下通过仿真评估的电荷转移电阻在很大程度上取决于环境中空气中盐的含量。可以得出结论，在空气中含盐量较大的任何部位形成的湿锈层在纯湿条件下均显示出较高的电导率。在干湿循环中，锈蚀的形成遵循Evans锈蚀模型。来自盐沉积物的较高电导率可促进在潮湿条件下更有效地减少锈层，并在交替的干湿循环中增加锈层的增长。

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