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Effect of corrosive media on galvanic corrosion of complicated tri-metallic couples of 2024 Al alloy/Q235 mild steel/304 stainless steel

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Journal of Materials Science & Technology 2019年第9期35卷 1886-1893页

作者： Linjun Shi Xiuying Yang Yingwei Song Dan Liua Kaihui Dong Dayong Shan En-Hou Han Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology o f ChinaHefei 230026China Shenyang Institute of Technology Fushun 113122China

Galvanic corrosion of tri-metallic couples is more complicated than that of bi-metallic couples. In this study, the effect of the pH of corrosive media on the galvanic corrosion of 2024 A1 alloy/Q235 mild steel/304 stainless steel tri-metallic couples was investigated using potentiodynamic polarization, scanning electron microscopy, scanning vibrating electrode technique and a multi-channel galvanic corrosion meter. The results show that 2024 always acts as the only anode in 3.5 wt% NaCl at pH 5.56,9.72 and 12.0, while both Q235 and 2024 act as anodes at pH 2.39 in the initial stage and then the role of Q235 changes at longer coupling time, which can be attributed to the effect of pH on the surface film of 2024. It is also found that the galvanic current density of a tri-metallic couple is the superposition of two bi-metallic couples when cathodic reactions are controlled by the diffusion of oxygen, otherwise it is smaller than that of the sum of two bi-metallic couples. The localized corrosion instead of uniform corrosion of anodic metal is accelerated by galvanic corrosion.

关键词： Galvanic corrosion Tri-metallic couples Corrosive media Scanning vibrating electrode technique Zero resistance ammeter

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A Device for Measuring 3-Phase Alternating Current at a Distance

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Journal of Electromagnetic Analysis and Applications 2015年第8期7卷 209-216页

作者： Seppo Makinen School of Technology Vaasa University of Applied SciencesVaasaFinland

We have made a preliminary study on a possibility to build a device, which could measure three-phase alternating current at a distance. This report gives a brief look at the theoretical background related with such a device and derives several mathematical results associated with the theory and the structure of the device. Our results suggest that such a device can be built, assuming the distances between the three current-carrying wires and the two sensors of the device are known accurately enough. There are ways to measure these distances, but this article does not concentrate on them.

关键词： Electromagnetic Induction 3-Phase Alternating Current ammeter

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