Abstract
The cavitation erosion-corrosion effect on the metal surface always forms irregular oxide structures. In this study, we reported the formation of regular self-assembled structures of amorphous nanoparticles around the cavitation erosion pits on carbon steel upon the ultrasonic cavitation in methylene blue solution. Each self-assembled structure was composed of linearly aligned nanoparticles of about 100 nm. The formation of self-assembled structures might be due to the combined effect of corrosion, specific sonochemical reaction in methylene blue solution, and the magnetic domain structures on the carbon steel.
Highlights
Ultrasonic cavitation erosion on the solid surface is due to the collapse of cavitation bubbles induced by the cyclical oscillation of horn in water
We reported the formation of regular self-assembled structures of amorphous nanoparticles around the cavitation erosion pits on carbon steel upon the ultrasonic cavitation in methylene blue solution
We reported the hierarchical self-assembled structures of nanoparticles in the peripheral area around the cavitation erosion pit on carbon steel when the ultrasonic cavitation was performed in methylene blue (MB) solution
Summary
Ultrasonic cavitation erosion on the solid surface is due to the collapse of cavitation bubbles induced by the cyclical oscillation of horn in water. The needle-like cavitation erosion pit is the typical impairment on stainless steel,[1] brass,[2] and aluminum.[3] For carbon steel, the cavitation erosion pit is always surrounded by a ring area.[4] When solution contains ions, the ring area begins to corrode and drastically increasing its size.[5] The ring area consists of irregular oxide structures.[4,5,6] Recently, nano-scale regular sheets have been found grown in the ring area on carbon steel due to the ultrasonic cavitation erosion-corrosion in the tap water (TW).[7,8] In this study, we reported the hierarchical self-assembled structures of nanoparticles in the peripheral area around the cavitation erosion pit on carbon steel when the ultrasonic cavitation was performed in methylene blue (MB) solution. This phenomenon demonstrated that the ultrasonic cavitation erosion-corrosion was distinct from the simple corrosion in a still aqueous solution
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