ALLOY PLATING SOLUTION FOR PREVENTING CORROSION INSIDE HOT WATER VESSEL MADE OF IRON AND PLATING METHOD USING THE SAME

摘要

PURPOSE: A plating solution to be covered and a plating method using the same are provided to form an alloy plating layer which comprises nickel and cobalt that are not harmful to the human body and are not eluted by hot water, thereby having superior corrosion resistance so as to prevent corrosion generated by contact of hot water with the inner surface of a hot water heat accumulating vessel or a low boiling vessel made of iron. CONSTITUTION: The alloy plating solution for preventing corrosion inside a hot water vessel made of iron comprises 60 to 80 g/l of NiSO4(NH4)2, 25 to 35 g/l of 2NiCO2· 3Ni(OH)2·4H2O, 5 to 10 g/l of Co(NH4)2·(SO4)2·6H2O, 10 to 15 g/l of CoSO4· 7H2O, 15 to 20 g/l of NaH2·PO2·H2O and 20 to 25 g/l of H3BO3 as a plating solution used in an alloy plating for preventing corrosion of an iron base metal. The method for plating the alloy plating solution comprises the processes of manufacturing a tank made of iron required for storing hot water; and plating the tank made of iron as rotating the tank at a current density of 4.0 to 4.8 A/dm2 for 5 to 10 minutes after filling a certain amount of the alloy plating solution in the tank, wherein a plating layer obtained by the alloy plating method comprises 75 wt.% of Ni and 15 wt.% of 15 wt.% of Co, and a thickness thereof is 96 to 108 microns.