PENGARUH KONSENTRASI EKSTRAK DAUN JAMBU BIJI (PSIDIUM GUAJAVA) TERHADAP LAJU KOROSI MATERIAL TEMBAGA PADA INTI RADIATOR MOBIL

THE EFFECT OF CONCENTRATION OF GUAWAE LEAF EXTRACT (PSIDIUM GUAJAVA) ON THE CORROSION RATE OF COPPER MATERIALS IN CAR RADIATOR CORE

Dalam era modern ini, pemanfaat logam tembaga oleh manusia semakin meluas, salah satu contoh pemanfaatan logam tembaga adalah pada radiator. Seperti pada perusahaan PT. Jakarta Teknologi Utama dan industri reparasi radiator. Salah satu penyebab mesin overheating, dipenuhi kerak dan korosi. Maka permasalahan yang terjadi pada radiator adalah cara pengendalian korosi yang efektif dan efisien melindungi radiator.

Penelitian ini merupakan penelitian eksperimen. Dalam penelitian ini pembuatan sampel tembaga dari inti radiator dan inhibitor korosi dari ektrak daun jambu biji (Psidium guajava) metode maserasi. Kemudian dilakukan uji korosi dengan menggunakan metode Weight loss. Data hasil eksperimen dianalisis dengan metode one way anova dan uji-t. 

Hasil dari penelitian ini ialah terdapat pengaruh signifikan pada hasil variasi konsentrasi ekstrak dan waktu perendaman pada material tembaga inti radiator mobil terhadap laju korosi dan efisiensi ekstrak daun jambu biji (psidium guajava). Laju korosi tertinggi terjadi pada spesimen tanpa penambahan ekstrak daun jambu biji (konsentrasi 0%) diwaktu perendaman 14 hari sebesar 0,042 mm/y. Nilai laju korosi terkecil yaitu sebesar 0,003 mm/y dan persen efisiensi inhibisi paling besar yaitu 92,4% yang didapatkan pada penambahan konsentrasi ekstrak daun jamu biji 15%.

Kata Kunci: Inti Radiator Tembaga, Ekstrak Daun Jambu Biji (Psidium Guajava), Korosi, Weight Loss.

In this modern era, the use of copper metal by humans is increasingly widespread, one example of the use of copper metal is in radiators. As in the company PT. Jakarta Utama Technology and radiator repair industry. One of the causes of engine overheating is that it is filled with scale and corrosion. So the problem that occurs in radiators is how to control corrosion effectively and efficiently to protect the radiator.

This research is experimental research. In this research, copper samples were made from radiator cores and corrosion inhibitors from guava leaf extract (Psidium guajava) using the maceration method. Then a corrosion test was carried out using the Weight loss method. Experimental data were analyzed using one way anova and t-test methods. 

The results of this research are that there is a significant influence on the results of variations in extract concentration and soaking time in car radiator core copper material on the corrosion rate and efficiency of guava leaf extract (psidium guajava). The highest corrosion rate occurred in specimens without the addition of guava leaf extract (0% concentration) when soaked for 14 days at 0.042 mm/y. The smallest corrosion rate value was 0.003 mm/y and the highest percent inhibition efficiency was 92.4% which was obtained when the concentration of herbal medicine leaf extract was added to 15%.

Keywords: Copper Radiator Core, Guava Leaf Extract (Psidium Guajava), Corrosion, Weight Loss.