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An Investigation on the Optimum Corrosion Protection Potential for Minimization of Cavitation Damage Using the Potentiostatic Method in Seawater

Published online by Cambridge University Press:  06 August 2013

Seong-Jong Kim ,
Seok-Ki Jang  and
Jae-Cheul Park
Seong-Jong Kim*
Affiliation:
Division of Marine System Engineering, Mokpo Maritime University, Haeyangdaehak-ro 91 Mokpo-si, Jeonnam 530-729, Korea
Seok-Ki Jang
Affiliation:
Division of Marine System Engineering, Mokpo Maritime University, Haeyangdaehak-ro 91 Mokpo-si, Jeonnam 530-729, Korea
Jae-Cheul Park
Affiliation:
Korean Register of Shipping, 17, Gukhoe-daero 68-gil, Yeongdeungpo-gu, Seoul 150-871, Republic of Korea
*
*Corresponding author. E-mail: ksj@mmu.ac.kr
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Abstract

In this study, we replaced the expensive blade material with an aluminum–bronze alloy that has excellent corrosion resistance and cavitation characteristics and developed the corrosion protection method to improve durability using an electrochemical method. The objective of this study was to identify the electrochemical corrosion protection conditions to minimize cavitation damage due to generating hydrogen gas (2H2O + 2e− → 2OH− + H2) by means of hydrogen overvoltage before the impact pressure of the cavity is transferred to the surface. In the constant potential experiment under the cavitation environment, the energy was reflected or cancelled out by collision of the cavities with the hydrogen gas generated by the hydrogen overvoltage. As a result, the optimal corrosion prevention potential in the dynamic state is assumed to be the range of −1.4 to −1.7 V, which is the range at which active polarization took place.

Keywords

aluminum–bronze alloyelectrochemical corrosion protection conditionhydrogen overvoltagecavitation environment
Type
Research Article
Information
Microscopy and Microanalysis , Volume 19 , Supplement S5: IUMAS , August 2013 , pp. 73 - 76
Copyright
Copyright © Microscopy Society of America 2013 

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