Effect of Addition Tahongai Leaf Extract (Kleinhovia hospita Linn.) As Organic Inhibitor on 1040 AISI Steel

Triana Yunita*, Asih Wentika Putri Kusuma, Sari Eli Novita, Sulistijono

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


This research will study about corrosion inhibition by using tahongai leaf extract (Kleinhovia hospita Linn.) in a 3.5% NaCl environment. The inhibitor is extracted using maceration process from Tahongai leaf (Kleinhovia hospita Linn.). Testing of antioxidant activity using DPPH method gives result that antioxidant activity of tahongai leaf extract (Kleinhovia hospita Linn.) is strong antioxidant (96%) compared to vitamin C (98%), functional group test by FTIR method indicates that tahongai leaf extract (Kleinhovia hospita Linn.) contain flavonoid shown by O-H bond (3357.41 cm-1), double bond C=C (164 3.36 cm-1), C-H bond (2922.24 cm-1, 1460.69 cm-1, 1375.57 cm-1), Efficiency of inhibition reach 99.9825% for addition of inhibitor with concentration 200 ppm and duration of immersion 20 days. This inhibition behavior is also supported by polarization measurements where the lowest corrosion rate of 8.3x10-4 mm/year is obtained at the same concentration and immersion time.

Original languageEnglish
Article number012006
JournalIOP Conference Series: Materials Science and Engineering
Issue number1
Publication statusPublished - 5 Sept 2019
Externally publishedYes
Event1st International Conference on Design and Application of Engineering Materials 2018, IC-DAEM 2018 in conjunction with 11th Seminar Nasional Metalurgi dan Material, SENAMM 2018 - Bandung, Indonesia
Duration: 6 Sept 20187 Sept 2018


  • Antioxidant
  • Organic inhibitor
  • Tahongai leaf (Kleinhovia hospita Linn.)


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