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<p>The effect mechanism of nickel on the corrosion process of weathering steels and the protection ability of the rust layer in a simulated industrial atmosphere were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction, and electrochemical tests. The electrochemical results indicated that the samples were more quickly to reach an electrochemical stable state and formed a denser rust layer with increasing nickel content. Meanwhile, there were two stages involved in the corrosion process for every sample. During the first 21&#xa0;days, the corrosion of the samples rate was influenced by the alloy composition and microstructure. After 21&#xa0;days of corrosion, the corrosion resistance was related to the protective ability of the rust layer, the content of sulfate ion, and hydrogen evolution reaction. The microscopic analysis shows that with the increase of nickel, the sample quickly attained to the electrochemical stable state and inhibited the local corrosion formation before the 21st day. An increase Ni in WS enhanced the proportion of α-FeOOH content in the corrosion products 21&#xa0;days later, which improved the protective ability of corrosion scales. Moreover, when the nickel content in WS reaches 5 wt%, the increased Ni in WS impels α-FeOOH form and inhibits the formation of NiFe<sub>2</sub>O<sub>4</sub>, which weakens the favorable effect of Ni on the protection of the rust layer.</p>

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Influence mechanism of Ni content on corrosion behavior of weathering steel under the simulated industrial atmosphere

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • Weiming Liu,
  • Qingsong Bian,
  • Jun Liao,
  • Qiyu Wang,
  • Hongbo Pan,
  • Fabin Cao,
  • Zhaojin Wu

摘要

The effect mechanism of nickel on the corrosion process of weathering steels and the protection ability of the rust layer in a simulated industrial atmosphere were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction, and electrochemical tests. The electrochemical results indicated that the samples were more quickly to reach an electrochemical stable state and formed a denser rust layer with increasing nickel content. Meanwhile, there were two stages involved in the corrosion process for every sample. During the first 21 days, the corrosion of the samples rate was influenced by the alloy composition and microstructure. After 21 days of corrosion, the corrosion resistance was related to the protective ability of the rust layer, the content of sulfate ion, and hydrogen evolution reaction. The microscopic analysis shows that with the increase of nickel, the sample quickly attained to the electrochemical stable state and inhibited the local corrosion formation before the 21st day. An increase Ni in WS enhanced the proportion of α-FeOOH content in the corrosion products 21 days later, which improved the protective ability of corrosion scales. Moreover, when the nickel content in WS reaches 5 wt%, the increased Ni in WS impels α-FeOOH form and inhibits the formation of NiFe2O4, which weakens the favorable effect of Ni on the protection of the rust layer.