Pengaruh Bio Inhibitor Ekstrak Daun Ketapang (Terminalia Catappa) Pada Ketahanan Korosi Baja Astm A36 Hasil Proses Pengelasan Dalam Media Korosi Air Gambut

Mahmudi, Rio Kurnia (2022) Pengaruh Bio Inhibitor Ekstrak Daun Ketapang (Terminalia Catappa) Pada Ketahanan Korosi Baja Astm A36 Hasil Proses Pengelasan Dalam Media Korosi Air Gambut. Other thesis, Universitas Islam Riau.

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Abstract

ASTM A36 steel is a common type of material used in general structures or constructions such as bridge construction, oil tanks, pipes, hull plates and others. The use of materials in peat water can cause corrosion to occur more quickly, especially in the welding area. Welding is a local joining process of metal using heat energy. Due to heat, the metal around the weld will experience a thermal cycle which causes changes in the microstructure, so that it will affect the mechanical properties such as strength and corrosion resistance of the welding results. Various ways have been done to reduce the corrosion rate on metals, one of which is the addition of corrosion inhibitors. Generally, corrosion inhibitors come from organic and inorganic compounds. Ketapang leaf is one type of plant that can be used as a corrosion inhibitor because it contains tannins. This study aims to determine the effect of bio-inhibitor composition of ketapang leaf extract on the corrosion rate of ASTM A36 steel in peat water media. The corrosion rate measurement method used is the weight loss method. The composition of the bio-inhibitor used was 0,250, 500, 750, 1000, and 1250 ppm with variations in immersion time of 5, 10, 15, 20, and 25 days. The results showed that the value of the corrosion rate decreased with the addition of the concentration of the inhibitor and the corrosion rate would increase with the addition of the immersion time. The lowest corrosion rate value that occurs in the welding material within 5 days occurs at a concentration of 750 ppm, which is 0.0820 mm/y and in the non-welding material occurs at a concentration of 750 ppm, which is 0.0656 mm/y, in the welding material at a time of 10 days. occurred at a concentration of 750 ppm that is 0.0984 mm/y and in non-welded materials at a concentration of 750 ppm that is 0.0820 mm/y, on welding materials for 15 days occurred at a concentration of 750 ppm that was 0.1231 mm/y and at the material without welding at a concentration of 750 ppm is 0.1067 mm/y, on the welding material at a concentration of 750 ppm it occurs at a concentration of 750 ppm that is 0.1887 mm/y and on the material without welding at a concentration of 750 ppm that is 0.1313 mm/y . The highest inhibitor efficiency value in the welding material occurred at a concentration of 1000 ppm with an immersion time of 15 days, namely 41.64% and in the material without welding it occurred at a concentration of 750 ppm with an immersion time of 5 days, namely 38.70%.

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