Table 1: Uncoated metals—interfacial contact resistance and corrosion resistant properties in simulated PEMFC environments.

Base metalTest environmentCorrosion current density (×10−6A cm−2)Interfacial contact resistance (mΩ cm2 at 150 N cm−2)Sample size 𝑙  ×  𝑤  ×  𝑡 (mm)PurgeReference

316L SS 1 × 10−5 to 1.0 M H2SO4 + 6.0 × 10−4 M F (NaF) at 70°C1.48 (1 × 10−5 M H2SO4)
0.88 (0.1 M H2SO4)
640 (1.0 M H2SO4)
50 (1 × 10−5 M H2SO4)
20 (0.1 and 1.0 M H2SO4)
10 (diameter)[70]

Ferritic SS type 444
Ferritic SS type 445J2
0.05 M H2SO4 + 2 ppm F at 80°C~30
~30
20 mm2 × 2 Ar or Air[72]

AISI 316L, AIS I321, AISI 347, Inconel 625, Inconel 825, Hastelloy C-276, tantalium, titanium85% H3PO4 at 30°C, 80°C, 120°C15 (diameter)[73]

316L SS high Cr and Ni Austenitic SS (26 wt% Cr, 19.4 wt% Ni)0.05 M H2SO4 + 2 ppm Fat 70°C200 (316L SS)
30 (HCN)
H2 (an)
Air (cat)
[76]

316L SS
317L SS
904L SS
98% H3PO4 at 170°C316L SS: 5–5.8 mA cm−2 317L SS: 5.0 mA cm−2
904L SS: 1.0–1.7 mA cm−2
25 × 13H2 (an)
Air (cat)
[77]

SS type 201
SS type SL219
1.0 M H2SO4at 70°C316L SS: 12
SS type 201: 8
>10025.4 × 12.7H2 (an)
Air (cat)
[78]

High nitrogen SS
(1.06 wt% N2)
0.05 M  S O 4 2  + 2 ppm Fat 80°C and pH 2.3, 4.3, 5.58 at 0.1 V
9 at 0.6 V
After 8 h polarization:
pH 2.3: 110
pH 4.3: 110
pH 5.5: 100
as polished: 20
(all at 100 N cm−2)
20 × 20 × 2 (for polarization test)
80 × 80 × 6 (for all other tests)
Ar or Air[79]