Abstract: The cavitation-erosion rules and synergistic mechanism of the AC-HVAF sprayed Fe-based amorphous metallic and WC-10Co-4Cr metallic cermet coatings in hydraulic fracturing fluid were studied by means of the ultrasonic cavitation and electrochemical testing methods. The leading role of the corrosion resistance and hardness during the cavitation was determined. The results showed that the existing of KCl in the fracturing fluid had a significant impact on the cavitation behavior of the coatings, especially for the lower corrosion resistance of metallic cermet coating. The cavitation performance of coatings in fracturing fluid was a double variable function of corrosion resistance and hardness. Mechanical damage of cavitation had a significant effect on cavitation erosion process of high hardness coating. The cavitation-erosion resistance of coatings was mainly dependent to hardness, and the high hardness of WC metallic cermet coating exhibited excellent cavitation-erosion resistance. The cavitation-erosion damage of coatings originated from the pores and defect areas, the hard phases striped off the surface and thus led to the damage of the hard metals and coa-tings. Reducing porosity and improving bonding strength were helpful to improve the corrosion resistance of coatings in fracturing fluid.
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2017, Vol. 31 
