... molten zinc liquid metal covering a method. In recent years, with the high-voltage transmission, transportation, communication, career development rapidly ... used, thiourea 0.1%, from 40 to 60 ° C, or with HCl 20%, methenamine 3 ~ 5g / L, 20 ~ 40 °C for ... thermal conductivity, high melting point, specific gravity, and not with zinc liquid alloy addition to iron function and antioxidant function ...