Protection against Corrosion of Aluminum Alloy in Marine Environment by Lawsonia inermis

H. M. Hajar,M. G. Mohd Sabri,W. B. Wan Nik,F. Zulkifli

doi:10.1155/2016/4891803

H. M. Hajar, M. G. Mohd Sabri + Show 2 more

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https://doi.org/10.1155/2016/4891803

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Abstract

The corrosion performance of aluminum alloy 5083 (AA5083) was investigated in the splash zone area simulated in salt spray cabinet at ambient temperature. Three paint formulations were prepared in accordance with different percentages of henna extract. FTIR method was used to determine the constituent of henna while weight loss and electrochemical method were applied to investigate the inhibition behaviour. The findings show that corrosion rate of aluminum alloy decreased with the increases of henna extract in the coating formulation. The rise of charge transfer resistance (Rct) value has contributed to the greater protection of the coated aluminum. The decrease in double layer capacitance value (Cdl) is another indicator that a better protective barrier has been formed in the presence of henna in the coating matrix.

Highlights

Aluminum was used widely in many sectors such as chemical plant, manufacturing lines, and marine industries
The advantage of using aluminum is due to their excellent corrosion resistance property and it becomes a priority in materials selections in most industries [1]
Aluminum alloy with 5000 series is excellent for the construction of small leisure boats, workboats, and the large high-speed passenger ship

Summary

Introduction

Aluminum was used widely in many sectors such as chemical plant, manufacturing lines, and marine industries. The advantage of using aluminum is due to their excellent corrosion resistance property and it becomes a priority in materials selections in most industries [1]. Aluminum alloy with 5000 series is excellent for the construction of small leisure boats, workboats, and the large high-speed passenger ship. The advantages of 5000 series aluminum are improved stability, reduced draft, minimized maintenance, and increased speed of the boats or ships. The method proposed includes material selection, coatings, corrosion inhibitors, cathodic protection, and change in design [3]. The polymer coating acts as a barrier to the direct exposure of oxidants and aggressive anions. The anodic protection system works when the conducting polymer with strong oxidative property acts as an oxidant to the test metals [4]

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