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<p>The cleanliness of molten aluminum has become increasingly important in the manufacture of high-pressure die-cast parts owing to the adoption of new machining technologies. The aluminum industry is in a tireless search to produce parts with a minimum level of inclusions and diluted gases in the alloy. In this study, four commercial cleaning fluxes were evaluated in molten and degassing processes at full scale in a high-pressure die casting manufacturing plant for aluminum parts for vehicle engines. Semiquantitative measurement techniques and K-Mold and reduced pressure tests for inclusions and dissolved hydrogen content, respectively, were used to evaluate the cleanliness levels of molten aluminum, and the generated dross was quantified. The K-Mold and reduced pressure test results consistently indicate that the application of fluxes in the melting process does not have a significant contribution, whereas their application is very important in the degassing process. High levels of cleanliness and the generation of low dross volumes were achieved with all fluxes evaluated.</p>

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Evaluation of Fluxes Used for Cleaning Aluminum Alloy for High-Pressure Die Casting

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Efraín Lara-Vizcarra,
  • Arturo Juárez-Hernández,
  • Rubén Vázquez-Medina,
  • Denis Ariel Ávila-Salgado,
  • José Luis Camacho-Martínez

摘要

The cleanliness of molten aluminum has become increasingly important in the manufacture of high-pressure die-cast parts owing to the adoption of new machining technologies. The aluminum industry is in a tireless search to produce parts with a minimum level of inclusions and diluted gases in the alloy. In this study, four commercial cleaning fluxes were evaluated in molten and degassing processes at full scale in a high-pressure die casting manufacturing plant for aluminum parts for vehicle engines. Semiquantitative measurement techniques and K-Mold and reduced pressure tests for inclusions and dissolved hydrogen content, respectively, were used to evaluate the cleanliness levels of molten aluminum, and the generated dross was quantified. The K-Mold and reduced pressure test results consistently indicate that the application of fluxes in the melting process does not have a significant contribution, whereas their application is very important in the degassing process. High levels of cleanliness and the generation of low dross volumes were achieved with all fluxes evaluated.