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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 4    August 2009

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Electrochemical characteristics of stainless steel using
impressed current cathodic protection in seawater
Seok-Ki JANG, Min-Su HAN, Seong-Jong KIM

Division of Marine Engineering, Mokpo Maritime University, Mokpo-City, Jeonnam, 530-729, Korea

Abstract:Stainless steels such as STS 304, 316 and 630 are frequently used as shaft materials in small fiber reinforced polymer (FRP) fishing boats. If the shaft material is exposed to a severely corrosive environment such as seawater, it should be protected using appropriate methods. The impressed current cathodic protection was used to inhibit corrosion in shaft materials. In anodic polarization, passivity was remarkably more evident in STS 316 stainless steel than in STS 304 and STS 630. The pitting potentials of STS 304, 316, and 630 stainless steels were 0.30, 0.323, and 0.260 V, respectively. The concentration polarization due to oxygen reduction and activation polarization due to hydrogen generation were evident in the cathodic polarization trends of all three stainless steeds. STS 316 had the lowest current densities in all potential ranges, and STS 630 had the highest. Tafel analysis showed that STS 316 was the most noble in the three. In addition, the corrosion current density was the lowest for STS 316.

 

Key words: stainless steel; shaft material; impressed current cathodic protection; passivity

ISSN 1672-7029
CN 43-1423/U

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