Electroplating Method for Producing Magnetic Conducting Materials

An electroplating method for producing magnetic conducting materials comprising the following steps:

• (1) releasing cooper wire on a releasing reel, said cooper wire having a diameter of 0.25±0.01 mm and a direct current resistance of 0.333˜0.392Ω;
• (2) allows the cooper wire goes through a constant tension release device to ensure a constant tension releasing the cooper wire, the constant tension is 1.5±0.5 kgf and the releasing speed is 5-15 m/min;
• (3) alkaline washing then clean water washing:
• soaking and washing the constant tension released cooper wire in a 7%˜10% of NaOH solution to remove grease and impurities on the surface of the cooper wire, said NaOH solution having a temperature 50° C.˜55° C. ;
• said NaOH solution having a PH value >11;
• the alkaline washing time is 10˜20 sec, afterward, washing the cooper wire with clean water;
• (4) degreasing process:
• taking the cooper wire from step (3) and degreasing it with a solution mixed with 7%˜10% of NaOH solution and 5%˜10% of degreasing agent, the temperature of the degreasing process is 50° C.˜55° C. and the degreasing time is 10˜20 sec, the cooper wire then undergo a second degreasing process for better degreasing effect and prepare for the next acidic washing process;
• (5) acidic washing then clean water washing:
• taking the cooper wire from step (4) and washing it with a 7˜10% diluted sulfuric acid to remove any rust on the surface of the cooper wire, said process also forms oxidizing film on and activates the surface of cooper wire;
• the washing time in the diluted sulfuric acid is 10˜20 sec, afterward, washing the cooper wire with clean water;
• (6) continuous electroplating:
• taking the cooper wire from step (5) as positive charge and taking nickel blocks as negative charges, placing said nickel blocks in titanium baskets, run through the constant tension released cooper wire in a plating solution in a plating bath sink to start the electroplating process;
• said plating solution having a PH value 3˜4;
• during the plating process the plating solution is controlled at temperature of 55° C.˜65° C. and electric current density of 1˜25 A/dm2;
• the plating time is 3˜11 min;
• the plating solution is pumped from a main plating bath sink;
• when electricity passes through the plating solution, the plating solution reacts with the nickels in the plating bath sink and form nickel deposit layer on the surface of cooper wire, in every one liter of plating solution there is 60˜80 g of nickel ion, 30˜40 g of iron ion, 30˜45 g of boric acid and 10˜20 g of nickel chloride;
• (7) taking the cooper wire from step (6) and washing it with clean water;
• then, washing it again with a water of temperature of 50° C.˜55° C. and electric conductivity ≤100 μs, this process provides a thorough washing of plating layer on the cooper wire and removing all impurities;
• (8) drying:
• taking the washed cooper wire and place it in a drying device for dehydrogenation drying, the drying temperature is 110° C.˜220° C. and the drying time is 10˜20 sec;
• (9) infrared diameter measurement:
• taking the dried cooper wire and using an infrared measuring device to measure its diameter to ensure even plating;
• (10) retracting the conducting material:
• retracting the cooper wire after infrared diameter measurement, the retracting constant tension is 1.5±0.5 kgf and the line distance is 0.6 mm.