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| Effect of Inclusions in Low Alloy-steels on Pitting |
| Received:August 19, 2012 Revised:January 01, 2013 |
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| DOI： |
| KeyWord:low alloy-steels inclusions pitting |
| Author | Institution |
| WANG Jian-min |
Navy Logistics Technology Equipment Institute，Beijing，China |
| ZHANG Yan |
Navy Engineering Quality Suspervision Station，Beijing，China |
| WANG Yan-fang |
Navy Logistics Technology Equipment Institute，Beijing，China |
| CHEN Xue-qun |
Naval University of Engineering，Wuhan，China |
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| Abstract: |
| Two low alloy steels with similar chemical compositions were selected as objects of research. Inclusions in them were analyzed by electronic probe micro-analyzer. The effects of inclusions in low alloy-steels were discussed by polarization tests and simulated occluded corrosion cell combined with microanalysis. The results showed that the inclusions in low alloy-steels are the main pitting initiation and the sulfide inclusions are easier to cause pitting corrosion than other inclusions; inclusions also accelerates pitting corrosion propagation and forms deep pit after dissolving; pitting potential of the alloy-steel by calcium treated and refined secondarily was nobler than that of the steel without because of the less and smaller inclusions; at the same time, pitting propagating rate of the steel treated by calcium and refined secondarily was also less than that of the steel without treatment. |
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