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<p>This study investigates the effect of three additives (Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>, Ce(SO<sub>4</sub>)<sub>2</sub>, and a Ce(SO<sub>4</sub>)<sub>2</sub>-citric acid C<sub>6</sub>H<sub>8</sub>O<sub>7</sub> composite) on the microstructure and properties of ceramic films formed on 2024 aluminum alloy in H<sub>2</sub>SO<sub>4</sub> electrolyte. The films were characterized by scanning electron microscopy, x-ray diffraction, and electrochemical analysis to evaluate their microstructure, phase composition, and corrosion resistance. Results show that the film formed in the H<sub>2</sub>SO<sub>4</sub> electrolyte had a higher surface pore density, while the films with additives exhibited a smoother surface with smaller, more uniform pores. The addition of Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>, Ce(SO<sub>4</sub>)<sub>2</sub>, and the composite additive increased the microhardness by 60, 59.2, and 94.7 HV, respectively, compared to the sulfuric acid system. Additionally, these additives raised the self-corrosion potential by − 0.16, − 0.07, and − 0.42&#xa0;V, respectively. The composite additive film showed the highest self-corrosion potential (−0.18&#xa0;V) and largest impedance arc radius, with the thickest barrier layer (369&#xa0;nm). The inclusion of C<sub>6</sub>H<sub>8</sub>O<sub>7</sub> in the composite additive delayed the dissolution of Ce(OH)<sub>4</sub> precipitates, significantly enhancing both microhardness and corrosion resistance.</p>

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Effects of Additives on Microstructure and Properties of 2024 Aluminum Alloy Surface Ceramic Film

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Jianjun Yang,
  • Zhiwei Peng,
  • Caihe Fan,
  • Shiyun Dong,
  • Danyang Liu,
  • Fan Yang,
  • Lin Li,
  • Ling Ou,
  • Xuehao Long,
  • Bowen Wang,
  • Zaiyu Zhang

摘要

This study investigates the effect of three additives (Al2(SO4)3, Ce(SO4)2, and a Ce(SO4)2-citric acid C6H8O7 composite) on the microstructure and properties of ceramic films formed on 2024 aluminum alloy in H2SO4 electrolyte. The films were characterized by scanning electron microscopy, x-ray diffraction, and electrochemical analysis to evaluate their microstructure, phase composition, and corrosion resistance. Results show that the film formed in the H2SO4 electrolyte had a higher surface pore density, while the films with additives exhibited a smoother surface with smaller, more uniform pores. The addition of Al2(SO4)3, Ce(SO4)2, and the composite additive increased the microhardness by 60, 59.2, and 94.7 HV, respectively, compared to the sulfuric acid system. Additionally, these additives raised the self-corrosion potential by − 0.16, − 0.07, and − 0.42 V, respectively. The composite additive film showed the highest self-corrosion potential (−0.18 V) and largest impedance arc radius, with the thickest barrier layer (369 nm). The inclusion of C6H8O7 in the composite additive delayed the dissolution of Ce(OH)4 precipitates, significantly enhancing both microhardness and corrosion resistance.