The International Journal of Engineering and Science (IJES) || Volume || 8 || Issue || 3 Series II || Pages || PP 69-76 || 2019 || ISSN (e): 2319 – 1813 ISSN (p): 23-19 – 1805 DOI:10.9790/1813-0803026976 www.theijes.com Page 69 The Effect of Material Heat Treatment on Hardness and Corrosion Rate in 319 as Aluminum Alloy Ade Hermawan 1 1 Fisheries Machinery, Jakarta Fisheries University, Indonesia Corresponding Author: Ade Hermawan ----------------------------------------------------------ABSTRACT-------------------------------------------------------------- The hardness value for the 319 as cast aluminum alloy with an average value of 45.2 HRB and the average hardness value for the 319 aluminum alloy treated with 63.6 HRB there is an increase in the hardness value of 71%, the corrosion rate for the 319 as aluminum alloy is as big as 0.1655 mpy while for aluminum heat treatment alloy has a corrosion rate of 0.0226 mpy, there is an increase in corrosion resistance of 7.3% so that the corrosion resistance of the 319 aluminum alloy heat treated is better than the corrosion resistance of the 319 as aluminum alloy, thus heat treatment on material has a positive effect on the value of hardness and corrosion rate of the material. KEYWORDS: Scrap, Hardness, Heat treatment, Corrosion rate --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 02-04-2019 Date of acceptance: 18-04-2019 --------------------------------------------------------------------------------------------------------------------------------------- I. BACKGROUND Aluminum is a lightweight metal that has good corrosion resistance. This material is used in a broad field not only for household appliances but also used for industrial purposes, for example for the aircraft industry, ship industry, automobile components, regulator components and other constructions. Apart from these properties aluminum is also cheap and easy to obtain, so the use of aluminum as a base material from time to time is increasing. As a result of the increase in the use of aluminum as a base material so that the amount of aluminum that is not used anymore has increased so that a new problem arises, namely the accumulation of waste. Therefore, an effort is needed to recycle the aluminum waste so that it can be utilized again into a new product. Most small metal casting companies do not use pure aluminum, but use scrap or reject material from previous casting materials. So that this affects the results and quality of the goods produced. Therefore, the strength and composition of aluminum alloy must be tested properly. In the manufacture of components the ship must have the technical specifications of the user. Some ship components are determined by the user, in addition to the technical specifications must also meet the standard. Standardization must be fulfilled in order to achieve safety and comfort for both passengers and the ship itself. Hardness is one of the material mechanical properties that shows the strength of the material. Good mechanical properties and material resistance to corrosion are very important to know in order to produce a quality and quality vessel component. This research was conducted to find out how much the effect of heat treatment material on the value of hardness and corrosion rate of the material. II. METHODOLOGY The method used in this research is descriptive and experimental methods so that data can be obtained regarding the effect of heat treatment on the hardness and corrosion rate of the material Determination of Aluminum Alloy Test Materials The aluminum alloy to be used in this study is an alloy with the target chemical composition approaching alloy 319, from mechanical properties this alloy has considerable tensile strength which is equal to 27 ksi or 186,158 N/mm2 for as cast and 36 ksi or 248,211 N/mm2 for T6, besides good mechanical properties, materials that are more environmentally friendly are also needed. The alternative material that is more environmentally friendly is obtained from scrap aluminum alloy, because this material is quite abundant in Indonesia.