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<p>The corrosion behavior of B<sub>4</sub>C/6061Al in spent nuclear fuel (SNF) storage environments was investigated in H<sub>3</sub>BO<sub>3</sub> solutions (0–10,000 ppm) at temperatures ranging from 20 °C to 90 °C by using experimental and computational approaches. The results reveal that dispersed B<sub>4</sub>C particles act as cathodes, accelerating the dissolution of the aluminum matrix rather than causing localized trench formation. In deionized water, a dual-layered protective corrosion product film forms, consisting of an inner γ-AlOOH layer and an outer Al(OH)<sub>3</sub> layer. H<sub>3</sub>BO<sub>3</sub> dissolves both the aluminum matrix and its corrosion products in the following order: Al(OH)<sub>3</sub> &gt; γ-AlOOH &gt; aluminum matrix, with increasing effect at higher concentrations. Elevated temperatures enhance both the formation of corrosion products and the dissolution rate by H<sup>+</sup>. Overall, the results suggest that B<sub>4</sub>C/6061Al exhibits high corrosion resistance in deionized water (BWR conditions) but suffers significant degradation in H<sub>3</sub>BO<sub>3</sub>-containing pools (PWR conditions).</p>

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Study of the effect of H3BO3 concentration and temperature on the corrosion behavior of B4C/6061Al

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月8日

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  • Bo Zhang,
  • Xin Lei,
  • Feifei Huang,
  • Hai Chang,
  • Shi Pu,
  • Ying Jin,
  • Christofer Leygraf

摘要

The corrosion behavior of B4C/6061Al in spent nuclear fuel (SNF) storage environments was investigated in H3BO3 solutions (0–10,000 ppm) at temperatures ranging from 20 °C to 90 °C by using experimental and computational approaches. The results reveal that dispersed B4C particles act as cathodes, accelerating the dissolution of the aluminum matrix rather than causing localized trench formation. In deionized water, a dual-layered protective corrosion product film forms, consisting of an inner γ-AlOOH layer and an outer Al(OH)3 layer. H3BO3 dissolves both the aluminum matrix and its corrosion products in the following order: Al(OH)3 > γ-AlOOH > aluminum matrix, with increasing effect at higher concentrations. Elevated temperatures enhance both the formation of corrosion products and the dissolution rate by H+. Overall, the results suggest that B4C/6061Al exhibits high corrosion resistance in deionized water (BWR conditions) but suffers significant degradation in H3BO3-containing pools (PWR conditions).