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<p>The corrosion behaviour of AA2014 aluminium matrix composites containing 0 to 15 vol.% ZrB<sub>2</sub> was investigated. The potentiodynamic polarization and immersion tests in 3.5 wt.% NaCl solution were carried out systematically. Further, it was analysed the effect of the reinforcement volume percentage, ageing time, and immersion time on corrosion behaviour. The polarization results indicated that the corrosion current density decreased with ZrB<sub>2</sub> addition up to 10 vol.% and increased at 15 vol.%, which was attributed to particle clustering and enhanced micro-galvanic effects. The cast that was heated at 170&#xa0;°C and soaked at 24&#xa0;h had the lowest rate of corrosion because it had a greater microstructural stability and reduced electrochemical heterogeneity. The corrosion rate decreased from 0.094&#xa0;mm/year for the base alloy to 0.038&#xa0;mm/year for the composite containing 10 vol.% ZrB<sub>2</sub>. The results of the immersion test indicated that the rate of corrosion was dependent on the duration; nevertheless, the optimized composite had always a better corrosion resistance than the unreinforced alloy. Microstructural study showed that the enhanced resistance to corrosion can be largely attributed to finer grains, even distribution of reinforcement and increased stability of the passive oxide film.</p>

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Corrosion Behaviour of Heat-Treated ZrB2-Reinforced AA2014 Aluminium Matrix Composites for Marine Applications

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • P. Rasagopal,
  • P. Dhiravidamani,
  • D. Jagadeesh,
  • C. Rajendran

摘要

The corrosion behaviour of AA2014 aluminium matrix composites containing 0 to 15 vol.% ZrB2 was investigated. The potentiodynamic polarization and immersion tests in 3.5 wt.% NaCl solution were carried out systematically. Further, it was analysed the effect of the reinforcement volume percentage, ageing time, and immersion time on corrosion behaviour. The polarization results indicated that the corrosion current density decreased with ZrB2 addition up to 10 vol.% and increased at 15 vol.%, which was attributed to particle clustering and enhanced micro-galvanic effects. The cast that was heated at 170 °C and soaked at 24 h had the lowest rate of corrosion because it had a greater microstructural stability and reduced electrochemical heterogeneity. The corrosion rate decreased from 0.094 mm/year for the base alloy to 0.038 mm/year for the composite containing 10 vol.% ZrB2. The results of the immersion test indicated that the rate of corrosion was dependent on the duration; nevertheless, the optimized composite had always a better corrosion resistance than the unreinforced alloy. Microstructural study showed that the enhanced resistance to corrosion can be largely attributed to finer grains, even distribution of reinforcement and increased stability of the passive oxide film.