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Cavitation Erosion Comparison Between Commercial Coatings and Polyurethane Coating Containting Nano-Carbon

Cavitation Erosion Comparison Between Commercial Coatings and Polyurethane Coating Containting Nano-Carbon
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Cavitation erosion occurring on the rudder, which is induced by cavities from a rotating propeller due to the local pressure decrease of the fluid, has adverse effect on the operation of the vessel. Cavitation resistant paints have been highly considered to prevent the rudder from eroding, because of its relatively easy application and low working cost compared to other preventing methods. 

Product Number: 41214-830-SG
Author: Se-Woong Kim, Chae-Seon Lim, Sang-Ki Chi, Jun-Young Choi, Jae-Hak Kim
Publication Date: 2014
Industries: Coatings , Corrosion Monitoring and Control
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$20.00
$20.00

Cavitation erosion occurring on the rudder, which is induced by cavities from a rotating propeller due to the local pressure decrease of the fluid, has adverse effect on the operation of the vessel. Cavitation resistant paints have been highly considered to prevent the rudder from eroding, because of its relatively easy application and low working cost compared to other preventing methods. However, existing commercial products show limitations on the resistant performance as well as uneven surfaces & bubbles (void space) inside coatings. The uneven surfaces and bubbles caused by application method (spreading paints using a spatula manually) are the factors of poor resistant performance. The study on the polymer coating containing nano-carbon powders to release the impact of the cavity’s implosion is conducted to enhance the resistant performance of the paint application method. The cavitation erosion tests for the coatings of heavy-duty paints for vessels and existing cavitation resistant paints are also conducted for comparison. The cavitation resistant performance is evaluated in accordance with modified ASTM G32 using a vibratory cavitation apparatus in distilled water. The eroded surfaces and cross-sections of eroded areas are observed by an optical microscope and SEM (Scanning Electron Microscope) to analyze the eroded morphologies. Test results show that the nano-carbon affects the resistant performance of the coating, and an optimum polymer coating is obtained. Also, it is estimated that the spray application improves the erosion resistance by means of forming a relatively even surface and reduces bubbles inside coatings compared with a plastering application using a spatula.

Cavitation erosion occurring on the rudder, which is induced by cavities from a rotating propeller due to the local pressure decrease of the fluid, has adverse effect on the operation of the vessel. Cavitation resistant paints have been highly considered to prevent the rudder from eroding, because of its relatively easy application and low working cost compared to other preventing methods. However, existing commercial products show limitations on the resistant performance as well as uneven surfaces & bubbles (void space) inside coatings. The uneven surfaces and bubbles caused by application method (spreading paints using a spatula manually) are the factors of poor resistant performance. The study on the polymer coating containing nano-carbon powders to release the impact of the cavity’s implosion is conducted to enhance the resistant performance of the paint application method. The cavitation erosion tests for the coatings of heavy-duty paints for vessels and existing cavitation resistant paints are also conducted for comparison. The cavitation resistant performance is evaluated in accordance with modified ASTM G32 using a vibratory cavitation apparatus in distilled water. The eroded surfaces and cross-sections of eroded areas are observed by an optical microscope and SEM (Scanning Electron Microscope) to analyze the eroded morphologies. Test results show that the nano-carbon affects the resistant performance of the coating, and an optimum polymer coating is obtained. Also, it is estimated that the spray application improves the erosion resistance by means of forming a relatively even surface and reduces bubbles inside coatings compared with a plastering application using a spatula.

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