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The optimum selection and protection characteristics with using impressed current cathodic protection for ship’s shaft materials

Seong-Jong Kim 1Seokcheol Ko 2

1. Mokpo Maritime University, Chukkyo Dong, Mokpo 530-729, Korea, South
2. Jeonnam Regional Innovation Agency (JINA), 1000 Namak-Ri Samhyang-Myun, Muan-Gun Jeonnam 534-700, Korea, South

Abstract

Stainless steels such as STS 304, 316 and 630 are frequently used as shaft materials in small FRP fishing boats. If the shaft material is exposed to a severely corrosive environment such as seawater it is protected using appropriate methods. We investigated the use of impressed current cathodic protection to inhibit corrosion in shaft materials. In anodic polarization, passivity was remarkably more evident in STS316 stainless steel than in STS304 and STS630. The pitting potentials of 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. STS316 had the lowest current densities in all potential ranges, and STS630 had the highest. Tafel analysis showed that STS316 was the most noble of the three. In addition, the corrosion current density was lowest in STS316.

 

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Related papers

Presentation: Poster at E-MRS Fall Meeting 2007, Symposium D, by Seokcheol Ko
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-01 17:21
Revised:   2009-06-07 00:44