2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 1: D'Abreu Intl. Symp. / Iron and Steel Making
| Editors: | Kongoli F, Noldin JH, Takano C, Lins F, Gomez Marroquin MC, Contrucci M |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 320 pages |
| ISBN: | 978-1-987820-37-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Effect of the characteristics of inclusions in Al-Ti complex deoxidized and Ca treated pipeline steel on the corrosion behavior in the chloride ion medium
Wan Zheng1;1WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY, WUHAN, China;
Type of Paper: Regular
Id Paper: 190
Topic: 2
Abstract:
To improve the inclusion characteristics in high strength pipeline steel and further enhance its corrosion resistance in the chloride ion medium , the characteristics of inclusions in Al-Ti complex deoxidized and Ca treated steel and their effect on the corrosion behavior in the chloride ion medium was investigated, the morphology, composition, deformation and distribution of inclusions in the steels with different Al content were characterized by SEM+EDS and Image Pro-Plus 6.0, and their corrosion susceptibility was evaluated by the experiment of natural corrosion and electrochemical polarization. The results show that compared to the Al-deoxidized steels, the number density of the inclusions with ellipsoid or elongated morphology in the Ti-deoxidized steels was relatively large, the size was small and the ratio of elongated inclusions with larger deformation aspect ratio (more than 1.5) was smaller, respectively. As a result, the natural corrosion rate of Ti-deoxidized steels in the chloride ion medium for 15 days were small. Furthermore, the pitting potential of Ti-deoxidized steel in the chloride ion medium was higher than that in Al-deoxidized steels, and its electric current density was smaller, which means the pitting corrosion resistance of Ti-deoxidized steel was better. Besides, the larger the inclusion was, the larger the corrosion area of steel matrix around the inclusion was. So, the smaller corrosion susceptibility of Ti-deoxidized steel is mainly attributed to a refiner and smaller deformation aspect ratio of inclusions compared to Al-deoxidized steel.