Abstract
Stainless steels have received wide attention as a substitute material for bipolar plates in high temper-ature proton exchange membrane fuel cell(HT-PEMFC).In the present work,the CrN,CrAlN and mul-tilayer CrN/CrAlN coatings were deposited on 316L SS to increase the corrosion resistance and decrease the interfacial contact resistance.The deposited coatings exhibited face centered cubic phase structure and it was verified from the X-ray diffraction pattern.X-ray photo electron spectroscopy results showed the formation of both CrN and CrAlN layers on 316L SS.CrN/CrAlN coating is more helpful in water management due to low surface roughness and high contact angle in the HT-PEMFC environment.The corrosion resistance behavior of all the samples were studied in 85％H3PO4 solution at 140℃purged with H2(HT-PEMFC anode)and O2(HT-PEMFC cathode)gases.The results showed that all the coatings considerably improved the performance of 316L SS and superior corrosion resistance was observed for CrN/CrAlN multilayer coating,whose protective efficiency was 98.12％and 96.14％in the two simulated HT-PEMFC environments.The results of electrochemical impedance spectroscopic studies demonstrated higher impedance for CrN/CrAlN coating.Surface morphological studies performed after corrosion stud-ies revealed that protection ability of CrN/CrAlN coating still remained acceptable.A very low interfacial contact resistance value of 6 mΩ cm2 at 140 N/cm2 was observed for CrN/CrAlN coating.Moreover,after corrosion studies,the interfacial contact resistance value of CrN/CrAlN coated 316L was much lower than that of CrN and CrAlN coatings due to the increased oxidation resistance.The maximum power density of about 0.93 W/cm2 at 2 A/cm2 and output voltage of 0.96 V was observed for CrN/CrAlN coating.
基金项目
Science and Engineering Research Board,New Delhi,India(SERB-PDF/2017/002594)
Instrument facilities pro-vided by State Key Laboratory of Tribology(SKLT)Tsinghua University,Beijing,China()
NETL
NSTL
维普
万方数据