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http://dx.doi.org/10.12656/jksht.2010.23.2.090

The Effect of Grain Size on the Corrosion Resistance of 429EM Steel  

Jung, Byong-Ho (Dept. of Metallurgical Engineering, Pukyong University)
Ahn, Yong-Sik (Division of Material Science and Engineering, Pukyong University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.23, no.2, 2010 , pp. 90-95 More about this Journal
Abstract
The effects of grain size on the corrosion resistance of 429EM ferritic stainless steels for automobile exhaust system were investigated. Using specimens held at maximum service temperature of $950^{\circ}C$ for 10~70 hours, electrochemical polarization tests were conducted. While corrosion current density, $I_{corr}$, was influenced little by grain size, pitting potential, $E_p$, was increased with an increase of grain size. Sensitizaton at grain boundary occurred when the specimen were held at $950^{\circ}C$ for above 50 hours because of the dissolution of precipitates and grain coarsening.
Keywords
429EM steel; Grain size; Electrochemical polarization test; Corrosion current density; Pitting potential; Sensitization; Dissolution of precipitate;
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