Steel corrosion in alkaline batteries

摘要: Abstract During extended shelf storage and accelerated aging, low carbon steel may corrode producing soluble iron species that cause internal cell shorting and/or gassing (leakage), thus undermining battery reliability. Soluble be generated from the active/passive transpassive dissolution of can steel. To minimize corrosion effects in commercial applications, NiCo plated is typically used. This report focuses on behavior pure metals (iron, nickel, cobalt) 40% KOH at temperatures between 20 °C 80 °C. A marked difference found for elements regarding actual passivating with time temperature. As expected, nickel spontaneously passivates all under study (20–80 °C). Cobalt other hand, active but shows an active/passive-transition. Iron only below 60 °C activates >60 °C. At sufficiently anodic potentials, passivity Fe lost by to form ferrates [FeO 4 ] 2− . The latter considered most likely corrosion-induced failure alkaline batteries.