Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (49권4호 349-356)

Electrochemical Damage Characteristics of Anodized 5083 Aluminum Alloy with Flow Rate in Seawater

양극산화 처리된 5083 알루미늄 합금의 해수 내 유속변화에 따른 전기화학적 손상 특성

박일초;김성종;
Park, Il-Cho;Kim, Seong-Jong;

목포해양대학교 기관시스템공학부;
Division of Marine Engineering, Mokpo National Maritime University;

DOI : 10.5695/JKISE.2016.49.4.349

Abstract

In this study, electrochemical damage behaviors with flow rate were investigated for anodized 5083 aluminum alloy in seawater. As the results of anodic polarization experiments and potentiostatic experiments at +1.0 V (vs. SSCE), the non-flow condition presented largely damaged surface resulting from a tendency of local pitting damage. Under various flow rate conditions, however, less surface damages under the application of anodic potential was obtained which is attributed to no accumulation of $H^+$ and $Cl^-$ ions on the surface. On the other hand, the results of the potentiostatic experiments at -1.0 V (vs. SSCE) with flow rate showed that anodized 5083 aluminum alloys could achieve the effective cathodic protection by low cathodic protection current density less than $2.61{ imes}10^{-7}A/cm^2$ even under high flow rate of 1 m/s.

Keywords

Aluminum alloy;Flow rate;Electrochemical characteristics;Cathodic protection;Anodizing;