Nephelium lappaceum extract as an organic inhibitor to control the corrosion of carbon steel weldment in the acidic environment

Femiana Gapsari*, Djarot B. Darmadi, Putu H. Setyarini, Hubby Izzuddin, Kartika A. Madurani, Ayoub Tanji, Hendra Hermawan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Organic inhibitors have been considered as an effective way to control the corrosion of carbon steel weldment in an acidic environment. This work proposes a new green organic inhibitor made of extract of rambutan fruit (Nephelium lappaceum) peel and aims at analyzing its corrosion inhibitor properties and protection mechanism. Specimens of carbon steel weldment were tested for their corrosion by using electrochemical and immersion methods in 1 M HCl solution containing 0 to 6 g/L of Nephelium peel (NP) extract. Results showed that, in the same solution, the corrosion rate was measured to be higher on the weld metal zone than that of base metal zone, which could be related to the coarser grain of the weld metal zone and the stability of the formed oxide layer. The addition of NP extract was found to increase the stability of the oxide layer, thus increasing the corrosion resistance of the specimens. The maximum inhibition efficiency of the NP extract was reached at 97% for weld metal with 5 g/L of extract, at 80% for the heat affected zone with 5 g/L, and at 70% for base metal with 4 g/L. This work reveals the particularity of different weldment zones to the different needs of inhibitor concentration for obtaining the optimum corrosion protection.

Original languageEnglish
Article number12135
JournalSustainability (Switzerland)
Volume13
Issue number21
DOIs
Publication statusPublished - 1 Nov 2021

Keywords

  • Acidic environment
  • Corrosion
  • Electrochemical test
  • Nephelium lappaceum
  • Organic in-hibitor
  • Weldment

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