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<p>During the demolition of thermal power plant smokestacks, extensive corrosion of the copper capsules in electronic detonators was observed, attributed to the in situ formation of ferric chloride within the reinforced concrete matrix. This degradation significantly compromised the integrity and reliability of the detonators, leading to erratic operational responses. An internal technical study conducted in 2021 systematically evaluated the degradation under realistic demolition conditions and revealed that the complete corrosion of the copper capsules resulted in the direct exposure of sensitive electronic circuitry to corrosive exudates derived from the explosive material. This exposure not only undermined the functional performance of the detonators but also raised concerns regarding operational safety. In contrast, aluminum capsules exhibited markedly superior resistance to ferric chloride-induced corrosion under the static exposure conditions evaluated, making them particularly suitable for corrosion-dominated demolition scenarios where severe water-hammer-type loading is not expected to govern detonator performance. These findings emphasize the critical importance of selecting appropriate encapsulation materials to mitigate corrosion-related failures in high-stress blasting applications.</p>

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Deterioration of Electronic Detonators During Demolitions of Large Reinforced Concrete Structures Exposed to Saltpeter

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Raúl Rodríguez de la Fuente,
  • Manuel Castejón Limas,
  • Javier Alfonso Cendón,
  • Gabriel Medina Martínez

摘要

During the demolition of thermal power plant smokestacks, extensive corrosion of the copper capsules in electronic detonators was observed, attributed to the in situ formation of ferric chloride within the reinforced concrete matrix. This degradation significantly compromised the integrity and reliability of the detonators, leading to erratic operational responses. An internal technical study conducted in 2021 systematically evaluated the degradation under realistic demolition conditions and revealed that the complete corrosion of the copper capsules resulted in the direct exposure of sensitive electronic circuitry to corrosive exudates derived from the explosive material. This exposure not only undermined the functional performance of the detonators but also raised concerns regarding operational safety. In contrast, aluminum capsules exhibited markedly superior resistance to ferric chloride-induced corrosion under the static exposure conditions evaluated, making them particularly suitable for corrosion-dominated demolition scenarios where severe water-hammer-type loading is not expected to govern detonator performance. These findings emphasize the critical importance of selecting appropriate encapsulation materials to mitigate corrosion-related failures in high-stress blasting applications.