Electrochemical characteristics of stainless steel using impressed current cathodic protection in seawater

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 c...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2009-08, Vol.19 (4), p.930-934
Main Authors: JANG, Seok-Ki, HAN, Min-Su, KIM, Seong-Jong
Format: Article
Language:English
Subjects:
316不锈钢
impressed current cathodic protection
passivity
shaft material
stainless steel
STS
外加电流阴极保护
材料腐蚀
电化学特性
腐蚀电流密度
阳极极化
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Summary: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.
ISSN:1003-6326
DOI:10.1016/S1003-6326(08)60380-5