Page 16 - IPCoSME 2021

1 INTERNATIONAL POSTGRADUATE CONFERENCE ON SCIENCE AND MARINE ENVIRONMENT 2021
st
(IPCoSME 2021)
“Environmental Sustainability Enhancement Through the Collaboration of Sciences”

RA-03

THE INCORPORATION OF Andrographis paniculata LEAVES EXTRACT AS AN
ADDITIVE IN COATING FOR STAINLESS STEEL 316L IN SEAWATER

1
NUR AIMAN SYAFIQ BIN MOHD HAMIDI AND MOHD SABRI MOHD
GHAZALI 1

1 Faculty of Science and Marine Environment, Universiti Malaysia Terengganu, 21030 Kuala
Nerus, Terengganu, MALAYSIA

*Corresponding author email: mohdsabri@umt.edu.my

Abstract: Anti-corrosion coating is a thin film that reduce the corrosion process in a corrosive

environment. Following the new trend nowadays in using green corrosion protection, Kalmegh
or Andrographis paniculata from the family of Acanthaceae is evaluated for its potential as an

additive in coating for stainless steel grade 316L (SS316L) via electrochemical impedance
spectroscopy (EIS), potentiodynamic polarization (PP) and scanning electron microscope

(SEM) in seawater. The Kalmegh extract are characterize via Fourier transform infrared (FTIR)

spectroscopy, Ultraviolet-Visible (UV-Vis) spectroscopy and High Performance Liquid
Chromatography (HPLC), which revealed the presence of asymmetry –NH, –CH and –OH,

two peaks at 450 nm and 661 nm and also andrographolide with a retention time of 4.650 min.

From the result, it showed that the corrosion resistance increase when increase the extract
concentration in the coating. The optimum efficiency is recorded at 10% of extract, where

further increase will lessen the inhibitive effect. From electrochemical analysis, the coatings
with additive perform as a mixed-type inhibitor, which was identified via polarization curve.

Results from SEM showed the inhomogeneous layers on the surface of the steel, possibly due
to the corrosive substances in the seawater.

Keywords: paint coatings; Andrographis paniculata; marine; stainless steel; EIS

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