Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Evaluation of the Characteristics of the Aluminum Alloy Casting Material by Heat Treatment

AC8A 알루미늄합금 주조재의 열처리에 의한 특성 평가

  • Lee, Syung Yul (Dept. of Marine Equipmentl Engineering, Korea Maritime Univ.) ;
  • Park, Dong Hyun (Dept. of Marine Equipmentl Engineering, Korea Maritime Univ.) ;
  • Won, Jong Pil (Dept. of Marine Equipmentl Engineering, Korea Maritime Univ.) ;
  • Kim, Yun Hae (Dept. of Marine Equipmentl Engineering, Korea Maritime Univ.) ;
  • Lee, Myung Hoon (Dept. of Marine System Engineering, Korea Maritime Univ.) ;
  • Moon, Kyung Man (Dept. of Marine Equipmentl Engineering, Korea Maritime Univ.) ;
  • Jeong, Jae Hyun (Dept. of Mechanical & Energy Systems Engineering, Korea Maritime University)
  • 이성열 (한국해양대학교 조선기자재 공학부) ;
  • 박동현 (한국해양대학교 조선기자재 공학부) ;
  • 원종필 (한국해양대학교 조선기자재 공학부) ;
  • 김윤해 (한국해양대학교 조선기자재 공학부) ;
  • 이명훈 (한국해양대학교 기관시스탬 공학부) ;
  • 문경만 (한국해양대학교 조선기자재 공학부) ;
  • 정재현 (한국해양대학교 기계. 에너지시스템 공학부)
  • Received : 2012.11.06
  • Accepted : 2012.12.28
  • Published : 2012.12.31
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Abstract

Aluminum is on active metal, but it is well known that its oxide film plays a role as protective barrier which is comparatively stable in air and neutral aqueous solution. Thus, aluminum alloys have been widely applied in architectural trim, cold & hot-water storage vessels and piping etc., furthermore, the aluminum alloy of AC8A have been widely used in mold casting material of engine piston because of its properties of temperature and wear resistance. In recent years, the oil price is getting higher and higher, thus the using of low quality oil has been significantly increased in engines of ship and vehicle. Therefore it is considered that evaluation of corrosion resistance as well as wear resistance of AC8A material is also important to improve its property and prolong its lifetime. In this study, the effect of solution and tempering heat treatment to corrosion and wear resistance is investigated with electrochemical method and measurement of hardness. The hardness decreased with solution heat treatment compared to mold casting condition, but its value increased with tempering heat treatment and exhibited the highest value of hardness with tempering heat treatment temperature at $190^{\circ}C$ for 24hrs. Furthermore, corrosion resistance increased with decreasing of the hardness, and decreased with increasing of the hardness reversely. As a result, it is suggested that the optimum heat treatment to improve both corrosion and wear resistance is tempering heat treatment temperature at $190^{\circ}C$ for 16hrs.

Keywords

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Cited by

  1. Effect of Pretreatment on the Dissolution of Aluminum Alloy during Hydration Process vol.12, pp.5, 2013, https://doi.org/10.14773/cst.2013.12.5.215
  2. Evaluation of the Characteristics of the Aluminum Alloy(AC8A) Casting Material by Heat Treatment(II) vol.20, pp.5, 2016, https://doi.org/10.9726/kspse.2016.20.5.029