Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Electroless Plating of Co-P Magnetic Films from Pyrophosphate Bath

피로인산염욕으로부터 Co-P자성막의 무전해 도금

  • Jo Jung-San (Department of Industrial Chemistry, College of Engineering, Hanyang University) ;
  • Koh, Suck-Soo (Department of Materials Engineering, College of Engineering, Hanyang University) ;
  • Lee, Ju-Seong (Department of Industrial Chemistry, College of Engineering, Hanyang University)
  • 조정산 (한양대학교 공과대학 공업화학과) ;
  • 고석수 (한양대학교 공과대학 재료공학과) ;
  • 이주성 (한양대학교 공과대학 공업화학과)
  • Published : 1986.12.01
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Abstract

Using sodium pyrophoshate as complexing agent, the characteristics and the magnetic properties of the films deposited from electroless cobalt plating bath have been studied. The result obtained are as following; 1. It was found that the optimum bath compositions consisted of 0.1M cobalt sulfate, 0.2M sodium hypophosphite as reducing agent, 0.4M sodium pyrophosphate as complexing agent and 0.5M ammonium sulfate as buffer agent, whereas good operating conditions were the bath of pH 10.5 adjusted with ammonia and 70$^{\circ}C$ of bath temperature, respectively. 2. The coercive force and the squareness of magnetic films were increased with deposition from the low temperature bath. 3. The phosphorous content in Co-P films deposited from these bath was relatively higher than that from Brenner bath. It was assumed to be due to codeposition of phosphorous from the pyrophosphate anion in the solution.

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