| 摘要 |
PURPOSE:To obtain a magnetic film producing little noise of medium by electroless plating by adding a malonate, a malate and glycine as complexing agents for metallic salts to an electroless plating soln. contg. a cobalt salt and a nickel salt. CONSTITUTION:An electroless plating soln. for producing a magnetic recording medium is prepd. by using 0.05-0.10mol/l cobalt salt such as cobalt sulfate, 0.01-0.05mol/l nickel salt such as nickel sulfate, 0.03-0.30mol/l hypophosphite such as sodium hypophosphite and 0.01-0.3mol/l ammonium sulfate as a pH buffer, and 0.1-0.6mol/l malonate such as sodium malonate, 0.1-0.6mol/l malate such as sodium malate and 0.2-0.6mol/l glycine as complexing agents for the metallic salts are added to the electroless plating soln. A magnetic film obtd. by electroless plating with the resulting plating soln. produces little noise of medium and is suitable for high density recording. |
