Role of Indium Alloying with Lead as a Means to Reduce the Passivation Phenomena in Lead/Acid Batteries

Figure 25

SEM photographs of passive film on (a) Pb, (b) Pb-0.5 In alloy, and (c) Pb-15 In alloy surface formed anodically in 4 M H₂SO₄ solution at passive region (1.2 V versus SCE) and at 20°C.

(a)

(b)

(c)