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| Effect of Rust Layer on Corrosion Resistance of Hull Steel |
| Received:March 07, 2012 Revised:June 15, 2012 |
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| DOI： |
| KeyWord:hull steel rust layer corrosion morphology |
| Author | Institution |
| TIAN Zhi-qiang |
Navy University of Engineering，Wuhan ，China |
| WANG Chong-bi |
Navy University of Engineering，Wuhan ，China |
| KONG Xiao-dong |
Navy University of Engineering，Wuhan ，China |
| WANG Yuan-sheng |
Navy University of Engineering，Wuhan ，China |
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| Abstract: |
| Five different types of hull steel were immersed in 3%NaCl solution for one year; the morphologies of inner and outer rust layers and the corrosion morphologies were obtained by metallographic microscope; and the corrosion characteristics of steel under rust layer were analyzed. The change in corrosion potential (OCP) were recorded for evaluation of influence of rust layer on corrosion tendency; the rust layer morphology and element distribution in inner layers were analyzed by means of electron probe micro-analyzer (EMPA). Average corrosion rate of steels was got by weight loss calculation. The results showed that outer rust layers have little influence on steels corrosion; the corrosion pits seen from steels corrosion morphology corresponds to defects in the inner rust layers; minimum of average corrosion rate is caused by the enrichment of Cr element in the inner rust layer and matrix cross-interface when steel has higher Ni and Cr content. |
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