Berdasarkan data yang dihasilkan pada proses sintesis inhibitor korosi dan uji performanya pada material baja ASTM A36, maka dapat ditarik kesimpulan sebagai berikut:
1. Sintesis inhibitor korosi telah berhasil dilakukan dengan produk akhir berupa fatty
acid diethanolamide 1:6 dan 1:20. Hasil karakterisasi FTIR menunjukkan bahwa telah
terbentuk peak pada bilangan gelombang 3325 cm-1 (1:6 dan 1:20) yang mengindikasikan gugus fungsi OH (stretching), 1620 cm-1 (1:6) dan 1622 cm-1 (1:20) yang mengindikasikan gugus fungsi C=O amida tersier (stretching), dan 1123 cm-1 (1:6 dan 1:20) yang mengindikasikan gugus fungsi C-O (stretching). Produk yang dihasilkan dari 2 rasio tersebut memiliki %yield sebesar 70,97% (1:6) dan 73,92% (1:20). 2. Hasil uji densitas dan viskositas pada inhibitor korosi 1:6 dan 1:20 menghasilkan nilai
sebesar 1,0397 g/cm3 dan 1231,3870 cSt untuk rasio 1:6. Sedangkan, 1,0707 g/cm3 227,5365 cSt untuk rasio 1:20.
3. Pengujian korosi yang dilakukan terhadap inhibitor korosi 1:6 pada material baja ASTM A36 dalam larutan uji korosif NaCl 3,5% menunjukkan kemampuan penghambatan, dengan adanya penurunan laju korosi yaitu, dari 0,25 mm/year (tanpa inhibitor) menjadi 0,20 mm/year (50 ppm), 0,01 mm/year (100 ppm), 0,05 mm/year (500 ppm), dan 0,17 mm/year (1000 pppm). Sedangkan, terhadap inhibitor korosi 1:20, penurunan laju korosinya dari 0,25 mm/year (tanpa inhibitor) menjadi 0,06 mm/year (50 ppm), 0,120 mm/year (100 ppm), 0,193 mm/year (500 ppm), dan 0,165 mm/year (1000 pppm). Lalu, inhibitor korosi 1:6 juga menghasilkan persentase efisiensi penghambatan sebesar 22,47% (50 ppm), 93,18% (100 ppm), 79,87% (500 ppm), dan 31,91% (1000 pppm). Sedangkan, inhibitor korosi 1:20 menghasilkan efisiensi penghambatan sebesar 73,79% (50 ppm), 53,61% (100 ppm), 25,40% (500 ppm), dan 36,23% (1000 pppm). Hasil ini sesuai dengan Hipotesis 1 (H1), yang menyatakan bahwa inhibitor korosi dapat menurunkan laju korosi dan menghasilkan nilai %efisiensi penghambatan korosi pada baja karbon rendah (ASTM A36) dalam larutan uji korosif berupa NaCl 3.5%.
4. Konsentrasi 100 ppm pada inhibitor korosi 1:6 merupakan konsentrasi optimum dalam menghambat proses korosi pada material baja di dalam elektrolit NaCl 3,5%.
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5.2 Saran
Saran yang dapat diaplikasikan atau dilakukan untuk penelitian selanjutnya
1. Melakukan pengujian inhibitor korosi dengan beberapa variasi suhu dan beberapa tambahan range konsentrasi untuk mengetahui tingkat penghambatan korosi lebih lanjut dengan lebih spesifik dari inhibitor korosi berupa fatty acid diethanolamide (rasio 1:6 dan 1:20).
2. Melakukan karakterisasi tambahan menggunakan SEM EDS untuk mengetahui kondisi permukaan dan komposisi dari baja setelah dilakukan pengujian performa inhibitor korosi.
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