Abstract In this work, a spinodal Copper alloy – C72900, was tested to investigate the resistance against environmentally assisted degradation. The material was tested according to ISO 15156-3 Level V in sour H2S solution and to cathodic polarization in simulated seawater with stressed samples. The results showed no indications of hydrogen stress cracking under cathodic polarization in seawater. However, cracks up to 3 mm deep were found on the samples exposed to sour H2S environment. Energy Dispersive Spectroscopy showed severe depletion of copper close to the cracks which is associated with selective corrosion. Stress corrosion cracking was the dominating crack mechanism in the ISO 15156-3 Level V test.

中文翻译：

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旋节线铜合金 C72900 的环境辅助降解

摘要 在这项工作中，对一种旋节线铜合金 – C72900 进行了测试，以研究其对环境辅助降解的抵抗力。该材料根据 ISO 15156-3 V 级标准在酸性 H2S 溶液中进行了测试，并在模拟海水中使用受压样品进行了阴极极化测试。结果表明在海水中阴极极化下没有氢应力开裂迹象。然而，在暴露于酸性 H2S 环境中的样品上发现了深度达 3 毫米的裂纹。能量色散谱显示裂纹附近的铜严重耗尽，这与选择性腐蚀有关。应力腐蚀开裂是 ISO 15156-3 V 级测试中的主要裂纹机制。