Analysis and Prevention of Corrosion and Cracking Failure of Sealing Rings
The failed sample is a fluororubber sealing ring,which leaked oil during use and was corroded.In order to identify the cause of the sealing ring corrosion,the morphology was analyzed using a scanning electron microscope,the elements were analyzed using an X-ray energy spectrometer,and the components of the sealing ring and oil-based mud were analyzed using a pyrolysis gas chromatography-mass spectrometry.The results showed that the oil-based mud contained fatty tertiary amines,which attack the proton hydrogen in the main structure of vinylidene fluoride hexafluoropropylene,causing corrosion of the sealing ring and resulting in oil leakage.
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