LiBr작동유체 중에서 가스흡수식 냉온수기의 국부부식 특성에 관한 연구

A Study on the Characteristics of Local Corrosion for Gas Absorption Refrigeration and Hot Water Systems in LiBr-$H_2O$ Working Fluids

  • Uh- Joh Lim (School of Mechanical Engineering, Pukyong University) ;
  • Ki-Cheol Jeong (Department of Gas & Refrigeration, TongmYong College) ;
  • Byoung-Du Yun (Department of Mechanical Engineering, Pukyong University)
  • 발행 : 2003.09.01

초록

Due to the electric power shortage in summer season and regulation of freon refrigerant, the application of gas absorption refrigeration and hot water systems are considerably increasing trend. But, this system consists of condenser, heat exchanger, supply pipe and radiator etc. which are easily corroded by acidity and dissolved oxygen and gases. In result, this system occurs scale attachment and corrosion damage like pitting and crevice corrosion. In this study, electrochemical polarization test of heat exchanger tubing material (copper, aluminium brass, 30% cupronickel(30% Cu-Ni)) was carried out in 60% lithium bromide solution at $95^{\circ}C$. As a result of polarization test, corrosion behavior by impressed potential and local corrosion. such as galvanic corrosion, pitting corrosion behavior, of tubing materials was investigated. The main results obtained are as follows: (1) The effect of pitting and crevice corrosion control of 30% cupronickel in 60% LiBr solution at $95^{\circ}C$ is very excellent. (2) Dissimilar metal corrosion of 30% cupronickel coupling to aluminium bronze is the most sensitive. (3) Current density behavior of tube materials by impressed potential is high in order of copper > aluminium brass > 30% cupronickel.

키워드

참고문헌

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