A surface treating agent for pre-nickel-plated steel cans and its application in the spraying of water-based graphite emulsion
Graphite coating on the inner surface of nickel-plated steel cans had a significant effect on the electrochemical performance of alkaline Zn-MnO2 batteries.In this paper,a surface treating agent consisting of lithium silicate,sodium silicate,polyether-modified polydimethylsiloxane,and polyethylene glycol was proposed for achieving the sealing protection and Dyne-value enhancement of pre-nickel-plated steel cans,which facilitated the rust prevention on the surface,as well as the spraying of water-based graphite emulsion.The treated steel cans were subjected to salt spray tests with 5％NaCl solution at 35 ℃ for 4 h without rusting,and its Dyne-value was up to 40 dyn/cm.Compared with the traditional spraying technology of oil-based graphite emulsion,this paper adopted the more economical and environmentally friendly water-based graphite emulsion spraying on the inner surface of treated steel cans to form a firmly adhered and uniformly dense graphite coating,so that the electrical conductivity of steel cans was increased by 2.38 S/cm.For large-scale production,the discharge time of assembled LR6-type batteries with continuous discharge at 3.9 Ω was about 409 min,which was attenuated by 0.58％and 8.65％after storage at 25 ℃ for 30 days and 60 ℃ for 8 weeks,respectively.
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