Anticorrosive and Microbial Inhibition Performance of a Coating Loaded with Andrographis paniculata on Stainless Steel in Seawater.

Wan Mohamad Ikhmal Wan Mohamad Kamaruzzaman,Nursabrina Amirah Mohd Nasir,Nur Aiman Syafiq Mohd Hamidi,Wan Mohd Norsani Wan Nik,Azila Adnan,Mohd Hafiz Mohd Zaid,Muhamad Syaizwadi Shaifudin,Khamirul Amin Matori,Mohd Sabri Mohd Ghazali,Fariza Hanim Suhailin,Maria Fazira Mohd Fekeri,Wan Rafizah Wan Abdullah,Chen Soo Kien,Mohamad Zahid Baharom

doi:10.3390/molecules26113379

Wan Mohamad Ikhmal Wan Mohamad Kamaruzzaman, Nursabrina Amirah Mohd Nasir + Show 12 more

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https://doi.org/10.3390/molecules26113379

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Abstract

With the trend for green technology, the study focused on utilizing a forgotten herb to produce an eco-friendly coating. Andrographis paniculata or the kalmegh leaves extract (KLE) has been investigated for its abilities in retarding the corrosion process due to its excellent anti-oxidative and antimicrobial properties. Here, KLE was employed as a novel additive in coatings and formulations were made by varying its wt%: 0, 3, 6, 9, and 12. These were applied to stainless steel 316L immersed in seawater for up to 50 days. The samples were characterized and analyzed to measure effectiveness of inhibition of corrosion and microbial growth. The best concentration was revealed to be 6 wt% KLE; it exhibited the highest performance in improving the ionic resistance of the coating and reducing the growth of bacteria.

Highlights

Corrosion is a natural phenomenon that involves oxidation and reduction in the presence of water and oxygen and leads to the degradation and deterioration of the metal [1]
This study aims to develop a new coating with a plant extract as an additive that enhances its anticorrosion and antimicrobial properties
The use of a plant extract as an additive in the coating yields a good result in reducing the degradation rate of the coating, it fills in the research gap on the topic of plant application in the field of corrosion in marine applications

Summary

Introduction

Corrosion is a natural phenomenon that involves oxidation and reduction in the presence of water and oxygen and leads to the degradation and deterioration of the metal [1]. The breakdown of a pipeline results in a higher cost of maintenance and repair, but may cause pollution due to oil spillage [3]. To address this problem, the use of a coating that protects materials from interacting with the environment is essential [4]. The degradation or failure of a coating begins when electrolytes penetrate the coating layer by forming small holes that allow electrolytes to enter and make contact with the metal, causing the corrosion reaction to take place [6]

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