Electrochemical corrosion characteristics of type 316 stainless steel in simulated anode environment for PEMFC |
| |
Authors: | MC Li CL Zeng JN Shen CN Cao |
| |
Affiliation: | a Institute of Materials, Shanghai University, 149 Yanchang Road, Shanghai 200072, PR China b State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Shenyang 110016, PR China |
| |
Abstract: | The corrosion behavior of type 316 stainless steel in simulated anode environment for proton exchange membrane fuel cell (PEMFC), i.e., dilute hydrochloric acid solutions bubbled with pure hydrogen gas at 80 °C, was investigated by using electrochemical measurement techniques. The main purpose is to offer some fundamental information for the use of stainless steels as bipolar plate material for PEMFC. Both polarization curve and electrochemical impedance spectroscopy (EIS) measurements illustrate that 316 stainless steel cannot passivate spontaneously in the simulated environments. The absorbed (and/or adsorbed) hydrogen atoms from cathodic corrosion reactions on the steel surface may deteriorate the passivity and corrosion resistance. The oxidation of these hydrogen atoms gives rise to a second current peak in the anodic polarization curve, and the current increases with immersion time. EIS spectra also reveal that a porous corrosion product layer formed on the steel surface during the active dissolution in the test solutions. 316 stainless steel exhibits the similar corrosion behavior in sulfate ions containing dilute hydrochloric acid solution. |
| |
Keywords: | Stainless steel Corrosion PEMFC Electrochemical impedance spectroscopy Bipolar plate |
本文献已被 ScienceDirect 等数据库收录! |
|