Towards Development of Surface Coating for Improved Cavitation Resistance


Hydrodynamic cavitation is known to have many harmful effects and of these effects, cavitation-induced erosion and surface pitting are detrimental to the life of hydraulic machines. One approach to reduce material damage could be through development of new materials and coatings with improved cavitation resistance. Though a large body of work exists on surface treatment methods, especially those involving surface hardening processes, use of non-metallic materials such as polymers as coatings on steel substrate has not received adequate attention. Present study addresses this gap through systematic study of different coatings involving vibratory cavitation (ASTM G-32 protocol) as well as studying the dynamics of single bubble near a material surface with appropriate coatings. Mass loss for different coatings under vibratory cavitation as well as the scanning electron microscopy study of these specimens has been reported. Pressure measurement as well as high speed imaging of single bubble collapse near the coated surface is also highlighted to bring out the efficacy of this system.

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