Abstract
Treating and cleaning corroded artefact has resulted in long-term loss of artefact integrity and intangible historical value in museum preservation method. Inhibitors and coatings are preferable methods applied in heritage conservation as it is the easiest way for corrosion protection. However, issue of health and environment has led conservators to find a better inhibitor, natural or green corrosion inhibitors. Surprisingly, Malay traditional practice has since long ago used Coconut water (CW) as corrosion inhibitor to preserve keris blades, showing that the knowledge in corrosion protection has been practiced in old Malay civilization for metal preservation. This paper intends to clarify the compositional effect of CW in the inhibition efficiency to iron-based keris blade. Through Tafel and Electrochemical Impedance Spectroscopy (EIS) and Energy dispersive analysis of X-rays (EDAX) analysis, the study showed that CW formed passivation with the highest IE of 92% as compared to other natural inhibitors existing and used in industries such as Ascorbic Acid (AA) and Tartaric acid (TA). EIS and Scanning Electron Microscope (SEM) study has shown and conclude that CW has displayed protective abilities that exceeds both AA and TA.
Highlights
Continuous cycle of corrosion followed by treating and cleaning corroded artefact has resulted in longterm loss of artefact integrity and intangible historical value [1]
Through Tafel and Electrochemical Impedance Spectroscopy (EIS) and Energy dispersive analysis of X-rays (EDAX) analysis, the study showed that Coconut water (CW) formed passivation with the highest IE of 92% as compared to other natural inhibitors existing and used in industries such as Ascorbic Acid (AA) and Tartaric acid (TA)
Since the weight gain of sample in tartaric acid is always higher than coconut water, ascorbic acid, and TA and AA (TAAA), it is deduced that the chemical substance in TA somehow accelerates the corrosion rate
Summary
Continuous cycle of corrosion followed by treating and cleaning corroded artefact has resulted in longterm loss of artefact integrity and intangible historical value [1]. Performing indoor environmental control with equipment to protect artefact from corroding is easy but costly to most museums [2]. Due to this reason, inhibitors and coatings are preferable methods applied in heritage conservation [3]. Inhibitors used in heritage preservation are borrowed from industries and not used in heritage preservation usage and some claims that it is even hazardous [4]. This led conservators to extend the search for safer and environmentally-friendly compounds, Green Corrosion Inhibitor (GCI) in metallic artefacts [5].
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