The effect of stress action on pyrite-chalcopyrite galvanic corrosion was investigated using polarization curves and electrochemical impedance spectroscopy (EIS) measurements. When stress increased from 0 to 4 x 10(5) Pa, the corrosion current density of pyrite-chalcopyrite increased from 5.678 to 6.719 mu A cm(-2), and the corrosion potential decreased from 281.634 to 270.187 mV, accompanied by a decrease in polarization resistance from 25.09 to 23.79 Omega center dot cm(2). EIS results show there have three time constants in the Nyquist diagrams, which indicated the presence of different steps during the corrosion process. Stress dramatically enhanced pyrite-chalcopyrite galvanic corrosion by affecting the Cu1 -aEuro parts per thousand x Fe1 -aEuro parts per thousand y S-2 film and the double layer, whereas had little impact on the adsorption species. When the stress changed from 0 to 4 x 10(5) Pa, the pore resistance and capacitance of the Cu1 -aEuro parts per thousand x Fe1 -aEuro parts per thousand y S-2 film, R (p) and Q (p), changed by 25.72 and 72.28 %, respectively. The adsorption species resistance, R (sl), and capacitance, Q (sl), only changed by 9.77 and 2.31 %, respectively.

Publication name	IONICS　Volume: 19 　Issue: 1 　Pages: 77-82　 Published: JAN 2013
Author(s)	Liu, Qingyou; Zhang, Yanqing; Li, Heping
Corresponding author	LI Heping liheping123@yahoo.com Chinese Acad Sci, Lab High Temp & High Pressure Study Earths Interi, Inst Geochem, Guiyang 550002, Peoples R China.

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