Abstract:
The main purpose of this project is to identify the corrosion behavior of aluminium metal
in two different coastal area of peninsular Malaysia. The physical properties of seawater
investigated were salinity, pH and temperature. Aluminium alloy is an important subject
of research because it is widely used in industry, abundant in nature and represent and
important category of their high technology value. Aluminium alloy (AA 5083) show
moderate to high strength and an excellent resistance to corrosion in seawater. There are
four factors contribute 5:XXX series aluminium alloy to corrosion; absorbed water layer,
chloride level, sulfides and sulfates and nature of oxide layer. Corrosion behavior of
Aluminium metal was investigated by using weight loss method, electrochemical
impedance spectroscopy (EIS) test, potentiodynamic polarization test and scanning
electron microscopy (SEM). The corrosive media is taken from two different coastal area
of peninsular Malaysia. Sample 1 is taken from Pantai Klebang, Malacca and sample 2 is
taken from Pantai Tok Jembal, Kuala Terengganu. The YSI 556 multi-parameter is a
system use to measure the dissolved oxygen, salinity, conductivity, pH and temperature
of sea water. The weight loss test will determine the corrosion rate for the aluminium
alloy. Electrochemical experiment contains 2 different types of tests which are
potentiodynamic polarization test and electrochemical impedance spectroscopy (EIS) test.
Both of these tests are using electrochemical impedance spectroscopy with the same setup
but different type of software. Frequency response analyzer (FRA) software will be used
for Electrochemical Impedance Spectroscopy (EIS) test, while potentiodynamic
polarization test using general purpose electrochemical system (GPES) as a software.
