Telah dilakukan penelitian mengenai pengaruh penambahan inhibitor ekstrak bawang dayak terhadap laju korosi. Bawang dayak dipilih karena mengandung antioksidan yang kuat sebesar 94% sehingga baik untuk dijadikan inhibitor yang dapat menghambat laju korosi. Material uji yang digunakan dalam penelitian ini adalah plat baja hitam yang rentan dan cepat terkena korosi di lingkungan air laut. Plat baja hitam direndam pada wadah berisi air laut dengan beberapa variasi penambahan bubuk ekstrak bawang dayak yakni 0 ppm, 50 ppm, 100 ppm, 150 ppm, 200 ppm. Pengamatan dilakukan terhadap laju korosi logam dan efesiensi inhibitor dari uji weight loss selama interval 5, 10, 15, 20, 25, dan 30 hari. Pengujian mekanisme kerja inhibitor dianalisa melalui uji foto makro dan uji FTIR. Hasil uji weight loss dan efisiensi menunjukkan nilai laju korosi tertinggi dengan penambahan inhibitor bawang dayak sebesar 200 ppm yaitu 0,09 mm/year, dengan efisiensi terendah 21,41%. Sedangkan nilai laju korosi terendah dengan penambahan inhibitor bawang dayak sebesar 50 ppm yaitu 0,12 mm/year dengan efisiensi tertinggi 35,85%.


Kata Kunci: Adsorpsi, Bawang Dayak, Inhibitor, Korosi

The impack of applying an inhibitor of dayak onion exract on the corrosion rate han been studied. Dayak onions were chosen because they have a large antioxidant content of 94%, making the suitable for use as corrosion inhibitors. A black steel plate was employed as the test object in this investigation because it was easily and guickly exposed to corrosion in a marine environment. The Dayak onion extract powder was added in various concentrations, ranging from 0 parts per million (ppm) to 50, 100, 150 and 200 ppm, to the black steel plate. O bservations were taken on the rate of metal corrosion and the effectiveness of the inbitor from the weight loss test at intervals of 5, 10, 15, 20, 25 and 30 days. A macro phototest and an FTIR test were used to evaluate the inhibitor,s mechanism of action. The results of the weight loss and efficeiency test revealed that the lowest efficiency was 21,41% and the greatest corrosion rate value with the addition of a Dayak onion onhibitor was 200 ppm, or 0,09 mm/year. With the use of Dayak onion inhibitor, the lowest corrosion rate value was 50 ppm, or 0,12 mm/year, whit the hinghest efficiency being 35,85%. Keywords: Adsorption, Dayak Onion, Inhibitor, Corrosion