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http://dx.doi.org/10.14773/cst.2012.11.6.280

Evaluation of the Characteristics of the Aluminum Alloy Casting Material by Heat Treatment  

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)
Publication Information
Corrosion Science and Technology / v.11, no.6, 2012 , pp. 280-285 More about this Journal
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
aluminum alloy; mold casting; corrosion resistance; wear resistance; solution heat treatment; tempering heat treatment;
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Times Cited By KSCI : 1  (Citation Analysis)
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