Iushi zhongguo effect of nano/ultrafine grain on passive film properties of metastable austenitic stainless steels with and without loading

作者：Lv Jinlong; Luo Hongyun^*

来源：Materials Chemistry and Physics, 2013, 139(2-3): 674-680.

DOI：10.1016/j.matchemphys.2013.02.015

• Annealing
• Electrochemical techniques
• Corrosion
• Deformation
• Phase transitions

The passive behaviors of coarse and nano/ultrafine grain austenitic stainless steels processed by cold rolling and reversion annealing were investigated. The average grain about 200 nm was obtained by cold rolling down to 94% reduction in thickness and reversion annealing at 800 degrees C for 250 s. Passive films formed in borate buffer solution (pH 9.2) have been characterized by electrochemical impedance spectroscopy and Mott-Schottky plots. The impedance results indicated a distinct inflection was observed with the increasing of potential, however, the Mott-Schottky analysis did not show such inflection point in the same potential range. There were not evident differences in passive properties between coarse and nano/ultrafine grain samples. This was attributed to synergistic effect of grain refinement and orientation. However, the corrosion resistance of the passive film in nano/ultrafine grain sample was higher than that in coarse grain sample after immersion test by the three-point-bend loading.

• 出版日期2013-5-15
• 单位北京航空航天大学