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电连接器产品组装交付用户并贮存半年后,发现H62黄铜压线卡发生断裂。通过对压线卡宏观观察、微观观察、能谱分析、硬度检查、金相检查,以及同批次压线卡的人工断口、硬度以及金相组织的对比分析,确定此次电连接器压线卡的断裂模式为应力腐蚀。断裂原因主要有两方面:一是压线卡内热缩膜体积较大导致压线卡承受较大拉应力;二是压线卡镀层表面发生破坏失去了保护基体材料的作用,在这两个方面因素的综合作用下最终导致压线卡发生应力腐蚀断裂。建议进一步对压线卡内热缩膜的体积进行量化控制,同时对电连接器压线卡表面镀层的生产、贮存、使用等过程进行控制,避免对镀层的损伤破坏。
After electrical connectors are assembled and delivered to the customer and stored for six months, the H62 brass crimping dies are found to be broken. Through the macroscopic observation of pressure line card, microscopic observation, energy spectrum analysis, hardness test, metallographic examination, and the same batch of pressure line card artificial fracture, hardness and comparative analysis of microstructure to determine the electrical connector crimping The fracture mode of the card is stress corrosion. There are two main reasons for the fracture: First, the larger shrinking film tension card pressure led to a larger tensile stress; the second is the pressure on the surface of the card coating loss of the role of protecting the matrix material loss in these two Under the combined action of factors, stress corrosion cracking will occur in the line card finally. It is suggested to further quantify the volume of the thermal shrink film in the press line card and to control the process of production, storage and use of the plating on the surface of the press line card of the electrical connector so as to avoid damage to the coating layer.