Abstract
The erosion pits formed in an ultrasound vibration cavitation were compared to those corrosion pits formed in static water. Concentric iridescent rings around the erosion pit make it different from those corrosion pits. The distinct color and the α-FeOOH structure of the rings indicated that the iridescent rings were oxidization film formed under high temperature generated in the cavitation environment. According to the direct observation on the development of the iridescent rings under microscope, the formation of the iridescent rings was attributed to the repeated interactions between mechanical removal and high temperature oxidization during the cavitation erosion. This work also illustrated the synergistic effect of erosion-enhanced corrosion during the cavitation erosion.
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Acknowledgments
This work is supported by NSFC Project (No. 51275266 and 51275036) and the Fundamental Research Funds for the Central Universities (FRF-TP-09-013A). And the authors would like to thank Liu Caiyun for her previous investigation on this work.
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Li, J., Wu, B. & Chen, H. Formation and Development of Iridescent Rings Around Cavitation Erosion Pits. Tribol Lett 52, 495–500 (2013). https://doi.org/10.1007/s11249-013-0234-7
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DOI: https://doi.org/10.1007/s11249-013-0234-7