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Intergranular Corrosion of a Light Aircraft Aluminum Alloy Propeller

机译:轻型飞机铝合金螺旋桨的晶间腐蚀

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摘要

Examination of the wreckage of a light aircraft revealed that approximately 20 cm was missing from one tip of the aluminum alloy propeller. Fractographic and metallographic examination of the remaining portion of the propeller revealed extensive grain-boundary separation in the vicinity of the fracture, and grain edges and corners rounded by corrosion on the fracture surface. Energy dispersive X-ray analysis (EDXA) revealed fluorine on, and in the vicinity of, the fracture surface. In the ensuing litigation, it was asserted that the crash occurred because the propeller fractured in flight as the result of intergranular attack caused by the use of a fluorine-bearing cleaner.
机译:对一架轻型飞机的残骸进行检查后发现,铝合金螺旋桨的一个末端缺少大约20厘米。对螺旋桨其余部分进行的分形和金相检查表明,在裂纹附近存在广泛的晶界分离,并且由于裂纹表面的腐蚀使晶粒的边缘和角变圆了。能量色散X射线分析(EDXA)显示在断裂表面及其附近有氟。在随后的诉讼中,据称发生坠机事故是因为螺旋桨在飞行中由于使用含氟清洁剂而引起的晶间腐蚀而破裂。

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