Effects of Ultrasonic Amplitude on Electrochemical Properties During Cavitation of Carbon Steel in 3.5% NaCl Solution
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Cavitation corrosion in many industrial plants has recently become a serious issue. Cavitation corrosionhas generally been investigated using a vibratory method based on ASTM G32 standard, and the test canbe divided into direct cavitation and indirect cavitation. Cavitation corrosion test uses the vibration frequencyof the horn of 20 kHz with constant peak-to-peak displacement amplitude. In this work, the peak-to-peakamplitude was controlled from 15 μm to 85 μm, and electrochemical measurements were obtained duringindirect cavitation. The relationship between cavitation corrosion rate and electrochemical properties wasdiscussed. Corrosion steps of carbon steel at the initial stage under cavitation condition in 3.5 % NaClcan be proposed. When the cavitation strength is relatively low, corrosion of the steel is more affectedby the electrochemical process than by the mechanical process; but when the cavitation strength is relativelyhigh, corrosion of the steel is affected more by the mechanical process than by the electrochemical process. This work confirmed that the critical ultrasonic amplitude of 0.42 %C carbon steel is 53.8 μm, and whenthe amplitude is less than 53.8 μm, the corrosion effect during the cavitation corrosion process is higherthan the mechanical effect.
Abstract
Cavitation corrosion in many industrial plants has recently become a serious issue. Cavitation corrosionhas generally been investigated using a vibratory method based on ASTM G32 standard, and the test canbe divided into direct cavitation and indirect cavitation. Cavitation corrosion test uses the vibration frequencyof the horn of 20 kHz with constant peak-to-peak displacement amplitude. In this work, the peak-to-peakamplitude was controlled from 15 μm to 85 μm, and electrochemical measurements were obtained duringindirect cavitation. The relationship between cavitation corrosion rate and electrochemical properties wasdiscussed. Corrosion steps of carbon steel at the initial stage under cavitation condition in 3.5 % NaClcan be proposed. When the cavitation strength is relatively low, corrosion of the steel is more affectedby the electrochemical process than by the mechanical process; but when the cavitation strength is relativelyhigh, corrosion of the steel is affected more by the mechanical process than by the electrochemical process. This work confirmed that the critical ultrasonic amplitude of 0.42 %C carbon steel is 53.8 μm, and whenthe amplitude is less than 53.8 μm, the corrosion effect during the cavitation corrosion process is higherthan the mechanical effect.
참고문헌 (35)
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