本文主要研究内容
作者（2019）在《Effect of corrosive media on galvanic corrosion of complicated tri-metallic couples of 2024 Al alloy/Q235 mild steel/304 stainless steel》一文中研究指出：Galvanic corrosion of tri-metallic couples is more complicated than that of bi-metallic couples. In this study, the effect of the p H of corrosive media on the galvanic corrosion of 2024 Al 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% Na Cl at p H 5.56, 9.72 and 12.0,while both Q235 and 2024 act as anodes at p H 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 p H 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.
Abstract
Galvanic corrosion of tri-metallic couples is more complicated than that of bi-metallic couples. In this study, the effect of the p H of corrosive media on the galvanic corrosion of 2024 Al 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% Na Cl at p H 5.56, 9.72 and 12.0,while both Q235 and 2024 act as anodes at p H 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 p H 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.
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