Exploration of natural polymers for use as green corrosion inhibitors for AZ31 magnesium alloy in saline environment

Saviour A. Umoren, Moses M. Solomon, A. Madhankumar, Ime B. Obot

Research output: Journal PublicationArticlepeer-review

99 Citations (Scopus)

Abstract

Seven natural polymers namely, chitosan (CHI), dextran (Dex), carboxymethyl cellulose (CMC), sodium alginate (ALG), pectin (PEC), hydroxylethyl cellulose (HEC), and Gum Arabic (GA) were screened for anticorrosion property towards AZ31 Mg alloy in 3.5 wt.% NaCl solution. CHI, Dex, CMC, PEC, and GA accelerated the corrosion while ALG and HEC moderately inhibited the corrosion of the alloy. HEC and ALG (1 g/L) protected the alloy by 64.13 % and 58.27 %, respectively. Two inhibitor cocktails consisting of either HEC or ALG, KI, and Date palm seed oil have been formulated. HEC- and ALG-formulations inhibited the alloy corrosion by 80.56 % and 77.43 %, respectively from EIS technique. Surface observation studies using SECM, AFM, SEM, and EDX agreed with other experimental results revealing effective corrosion inhibition by the formulations. X-ray photoelectron spectroscopy, FTIR, and UV–vis results disclose that Mg(OH)2 co-existed with adsorbed inhibitor complexes.

Original languageEnglish
Article number115466
JournalCarbohydrate Polymers
Volume230
DOIs
Publication statusPublished - 15 Feb 2020
Externally publishedYes

Keywords

  • Corrosion
  • Corrosion inhibition
  • Corrosion inhibitor formulation
  • Magnesium alloy
  • Natural polymer
  • Saline medium

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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