Morphology and Electrochemical Characterization of Electrodeposited Nanocrystalline Ni-Co Electrodes for Methanol Fuel Cells

Table 4

Corrosion properties of nanocrystalline electrodeposited Ni-Co alloys and the steel substrate in 1 M methanol + 0.5 M H₂SO₄.

Time (min)			(mV)	(μA/cm^2)	Corrosion rate (μm/y)	(KΩ)
30 mA/cm^2
15	40.5	37.5	−205.9	6.64	71.59	1.12
20	47.7	48	−162	5.93	63.95	3.27
30	37.7	33	−156.1	5.04	54.33	1.99
50 mA/cm^2
15	24.9	41.6	−188	5.61	60.53	0.999
20	25.9	42.8	−104	4.71	50.78	1.240
30	27.6	36.7	−97.4	3.40	36.73	1.540
80 mA/cm^2
15	27.4	40	−116	3.53	38.11	1.95
20	17.1	31.6	−85	2.47	26.73	0. 846
30	10.4	29.2	−52.2	2.37	25.62	1.82
Stainless steel substrate
—	13.58	34.2	−231	1.53	11.73	8.36