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| Mechanism of induced pitting corrosion in 439M ferritic stainless steel |
| QIN Huai-peng1,2，CHEN Hai-tao2，LANG Yu-ping2，CHEN Qing-ming1 |
（1. Faculty of Materials Science and Engineering， Kunming University of Science and Technology， Kunming 650093， Yunnan， China
2. Institute for Special Steel， Central Iron and Steel Research Institute， Beijing 100081， China） |
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Abstract 439M ferritic stainless steel is widely used in automobile muffler of exhaust system and the pitting corrosion damage is the main failure form. The pitting corrosion test， the initiation pH of depassivation and micro-electrochemical test were applied to study the morphology of the pitting corrosion and inclusions combined with the analysis ofscanning electron microscopy (SEM) and energy dispersive spectroscopy(EDS). Also the variation of inclusions was researched at the start of pitting corrosion occurrence. The results indicated that the pitting corrosion was found to be initiated at the interface between the round oxide inclusion complex and the matrix， while little pitting corrosion occurred arround the TiN inclusion. The composite oxide inclusions containing Ca-oxides part can be preferential dissolved when inclusions induced pitting corrosion. Finally， the model of the initiation process of the composite oxide inclusion-induced pitting corrosion in 439M ferritic stainless steel exposed to chloride ions environments was established.
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Received: 19 January 2015
Published: 08 September 2015
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2015, Vol. 50 
