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<p>The effect of heat treatment on the corrosion resistance of selective laser melted (SLM) AlSi10Mg alloy in potassium hydroxide (KOH) solution was investigated. Samples underwent solution treatment at 500&#xa0;°C for 5&#xa0;h, followed by aging at 240&#xa0;°C for 0.5, 2, and 8&#xa0;h. Heat treatment transformed the microstructure from a fish-scale pattern to an α-Al matrix with dispersed Si particles, improving corrosion resistance compared to the as-fabricated (AF) condition. Electrochemical impedance spectroscopy (EIS) results showed a 9.4-19.8% increase in film resistance, and open circuit potential (OCP) values shifted from -1.52&#xa0;V (AF) to an average of -1.48&#xa0;V (heat-treated). Cyclic polarization showed pitting in 0.5&#xa0;M KOH, while no clear pitting potential (E<sub>pit</sub>) was observed in higher KOH concentrations. Immersion testing confirmed the AF sample had the highest corrosion rate, while solution-treated (ST) alloy provided the lowest. Aging increased the corrosion rate slightly (ST-A0.5) and significantly at longer durations (ST-A2, ST-A8). XRD and FTIR confirmed Al(OH)<sub>3</sub> as the primary corrosion product. Microhardness decreased by 19.5-50.1% after heat treatment, from 97 HV1 in the AF condition. Overall, heat treatment, especially ST alloy, enhanced corrosion resistance but reduced hardness, highlighting the trade-off between mechanical and electrochemical performance in SLM AlSi10Mg alloys.</p>

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Corrosion Resistance, Microstructural Evolution, and Hardness Response of Selective Laser Melted AlSi10Mg Alloy in KOH Solution: Influence of Heat Treatment

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Asep Ridwan Setiawan,
  • Bonifasius Victor Imanuel Gultom,
  • Charles Firmansyah,
  • Mahesa Kanigara Kasiyanto,
  • Yorina Sarah Franscoise Lantang

摘要

The effect of heat treatment on the corrosion resistance of selective laser melted (SLM) AlSi10Mg alloy in potassium hydroxide (KOH) solution was investigated. Samples underwent solution treatment at 500 °C for 5 h, followed by aging at 240 °C for 0.5, 2, and 8 h. Heat treatment transformed the microstructure from a fish-scale pattern to an α-Al matrix with dispersed Si particles, improving corrosion resistance compared to the as-fabricated (AF) condition. Electrochemical impedance spectroscopy (EIS) results showed a 9.4-19.8% increase in film resistance, and open circuit potential (OCP) values shifted from -1.52 V (AF) to an average of -1.48 V (heat-treated). Cyclic polarization showed pitting in 0.5 M KOH, while no clear pitting potential (Epit) was observed in higher KOH concentrations. Immersion testing confirmed the AF sample had the highest corrosion rate, while solution-treated (ST) alloy provided the lowest. Aging increased the corrosion rate slightly (ST-A0.5) and significantly at longer durations (ST-A2, ST-A8). XRD and FTIR confirmed Al(OH)3 as the primary corrosion product. Microhardness decreased by 19.5-50.1% after heat treatment, from 97 HV1 in the AF condition. Overall, heat treatment, especially ST alloy, enhanced corrosion resistance but reduced hardness, highlighting the trade-off between mechanical and electrochemical performance in SLM AlSi10Mg alloys.