PROTEKSI KOROSI PADA BAJA API 5L DENGAN INHIBITOR ORGANIK EKSTRAK DAUN BAWANG DAYAK (Eleutherme Americana Merr) DALAM LINGKUNGAN HCL 0,5 M

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Corrosion is a decrease in metal quality due to an electrochemical reaction with its environment. Many factors can cause corrosion of a material. One of them is due to the influence of the concentration of chloride acid dissolved in water media so that the environment is corrosive (acidic). Corrosion can occur in various forms, ranging from uniform corrosion on the entire metal surface to corrosion that is concentrated in certain parts. There are many methods to inhibit the corrosion process. One of the many methods is the use of inhibitors. Organic inhibitor is a type of inhibitor that is non-toxic, inexpensive, readily available in nature, easy to renew and does not damage the environment. These organic inhibitors are obtained by extracting some materials that exist in nature. In this study, the inhibitor used was Dayak leek. The inhibitor is used on API 5L steel material in 0.5M HCl media. The method used to retrieve the steel corrosion rate data using the weight loss method. The inhibition efficiency reached 99.02% for the addition of an inhibitor with a concentration of 5% with an immersion time of 10 days with a corrosion rate of 4.46 mpy.

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