Influence of pH on corrosion resistance of electrodeposited Mg-Fe LDH composite films on Mg alloys WE43

Poovarasi Balan, Jesslyn Kim Ean Tan, Raj N A N, S Nayak

Research output: Contribution to journalConference articleOther

Abstract

Layered double hydroxide (LDH) are widely studied as corrosion inhibition coatings
for magnesium (Mg) alloys due to their nano-lamellar structure and anion-exchange ability. The
two common approaches in synthesising LDH films on Mg alloys are co-precipitation and
hydrothermal treatment. Recently, electrodeposition has drawn more interest as a potential
synthesis approach due to the low cost, ease of control, one-step method, and ability to create a
compact film. In this work, Mg-Fe LDH film was synthesised on magnesium hydroxide,
Mg(OH)2 layer formed on Mg alloy WE43 by electrodeposition approach with the as-prepared
iron solution at different pH values. The effect of pH of the solution (3.0, 5.0 and 7.0) on the
formation of LDH films was investigated using Field Emission Scanning Electron Microscopy
(FESEM). Additionally, the surface chemical components of the film were obtained by Fourier
Transform Infrared Spectrometer (FTIR). All the LDH composite films synthesised at different
pH values undergo electrochemical tests in Hank's Balanced salt solution (HBSS). All samples
promote corrosion resistance of WE43 with the LDH film synthesised at pH 3.0 provided the
highest inhibition efficiency (I.E) of 94.48 % and resistance polarisation value of 3559. 07 Ωcm2
Original languageEnglish
Article number012036
Number of pages9
JournalIOP Conference Series: Materials Science and Engineering
Volume1195
DOIs
Publication statusPublished - 2021
EventSymposium of Malaysian Chemical Engineers 2021 - Sarawak, Malaysia
Duration: 15 Jul 202116 Jul 2021
Conference number: 32nd
https://iopscience.iop.org/issue/1757-899X/1195/1

Keywords

  • Layered double hydroxide, magnesium alloys, surface modification, corrosion, coatings
  • electrodeposition
  • composite film

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