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<p>This study investigated the corrosion characteristics of weathering steels (WSs) with varying nickel contents in a simulated marine atmosphere, as well as the primary mechanism of action for nickel (Ni) during the corrosion process, by combining electrochemical methods and microanalytical techniques. The research findings reveal that the corrosion scales of nickel-containing steels exhibit better compactness compared to carbon steel, along with a distinct layered structure. Notably, the compactness of the corrosion scale increases with higher nickel content, effectively inhibiting the diffusion of Cl⁻ within the inner rust layer. The primary components of the corrosion scale are identified as α-FeOOH, γ-FeOOH, Fe₃O₄, and Fe₂O₃. With increasing Ni content, the proportions of α-FeOOH and γ<sup>*</sup>(γ-FeOOH, Fe₃O₄, and Fe₂O₃) in the corrosion scale are observed to rise. The corrosion process of the specimens is divided into two stages. Within the first 60 days, the polarization resistance (<i>R</i><sub>p</sub>) values of the specimens initially decrease and then gradually increase with the extension of corrosion time, which is attributed to the destructive effect of Cl⁻ on the corrosion products and the subsequent formation of a corrosion scales. The <i>R</i><sub>p</sub> values of carbon steel are higher than that of weathering steel, since Ni in WS reduces the corrosion rate of the specimens and delays the formation of the protective corrosion scale on their surfaces. Specifically, the higher the nickel content, the greater <i>R</i><sub>p</sub> value WSs, indicating that Ni is beneficial for retarding the corrosion rate of the sample. After 60 days of corrosion, the <i>R</i><sub>p</sub> values of WSs exceeds that observed in the earlier stage, which is associated with the formation of a stable corrosion scale in WSs. With prolonged corrosion time, the <i>R</i><sub>p</sub> values of WSs decreases, a trend linked to the destructive effect of Cl⁻ on corrosion scales. In summary, the <i>R</i><sub>p</sub> values of WSs are significantly superior to that of carbon steel, and this superiority strengthens with increasing nickel content. This enhancement is primarily ascribed to the improved compactness of the corrosion scale and the inhibited Cl⁻ penetration in corrosion scales induced by Ni.</p>

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Study on corrosion process and the mechanism of Ni action in weathering steels with different nickel contents under simulated marine atmosphere

  • 期刊论文

  • 发表日期：

    2025年12月25日

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  • Rongjian Cui,
  • Weiming Liu,
  • Zhifang Gao

摘要

This study investigated the corrosion characteristics of weathering steels (WSs) with varying nickel contents in a simulated marine atmosphere, as well as the primary mechanism of action for nickel (Ni) during the corrosion process, by combining electrochemical methods and microanalytical techniques. The research findings reveal that the corrosion scales of nickel-containing steels exhibit better compactness compared to carbon steel, along with a distinct layered structure. Notably, the compactness of the corrosion scale increases with higher nickel content, effectively inhibiting the diffusion of Cl⁻ within the inner rust layer. The primary components of the corrosion scale are identified as α-FeOOH, γ-FeOOH, Fe₃O₄, and Fe₂O₃. With increasing Ni content, the proportions of α-FeOOH and γ*(γ-FeOOH, Fe₃O₄, and Fe₂O₃) in the corrosion scale are observed to rise. The corrosion process of the specimens is divided into two stages. Within the first 60 days, the polarization resistance (Rp) values of the specimens initially decrease and then gradually increase with the extension of corrosion time, which is attributed to the destructive effect of Cl⁻ on the corrosion products and the subsequent formation of a corrosion scales. The Rp values of carbon steel are higher than that of weathering steel, since Ni in WS reduces the corrosion rate of the specimens and delays the formation of the protective corrosion scale on their surfaces. Specifically, the higher the nickel content, the greater Rp value WSs, indicating that Ni is beneficial for retarding the corrosion rate of the sample. After 60 days of corrosion, the Rp values of WSs exceeds that observed in the earlier stage, which is associated with the formation of a stable corrosion scale in WSs. With prolonged corrosion time, the Rp values of WSs decreases, a trend linked to the destructive effect of Cl⁻ on corrosion scales. In summary, the Rp values of WSs are significantly superior to that of carbon steel, and this superiority strengthens with increasing nickel content. This enhancement is primarily ascribed to the improved compactness of the corrosion scale and the inhibited Cl⁻ penetration in corrosion scales induced by Ni.