Evaluation of Inhibitive Action of Sodium Benzoate on Corrosion Behaviour of AA6063 in Seawater

Corrosion is a fundamental process which plays an important role in economics and safety. Apparently, corrosion cannot be avoided, but its severity can be prevented. Inhibitors have always been considered to be the first line of defense against corrosion. Several corrosion inhibitors are available today. The objective of this study was to evaluate the effectiveness of sodium benzoate as an inhibitor to slow down or prevent corrosion. This project involves the use of gravimetric measurements, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) to evaluate inhibitive action of sodium benzoate on corrosion behavior of AA6063 aluminium alloy in seawater. The electrochemical measurements showed that the presence of sodium benzoate as an inhibitor significantly decrease the weight loss, corrosion current densities (icorr), corrosion rates and double layer capacitance (Cdl), whilst increasing the polarization resistance (Rp)

Modeling Net Power of Sabah Trough and Its Effectiveness

The prospect of ocean thermal energy conversion (OTEC) system in Malaysia was realized in 2008 by survey carried out in South China sea. Since then various stake holders were sensitize about numerous benefit of renewable energy. The author used the temperature/ depth profile obtained during that survey in 2008 to calculate the net power for Sabah trough using Lockheed Martin proposed model for estimation of OTEC potential worldwide.  Their Model developed comprises critical assumptions and account for major contributing and loss factors to electrical power system. The MATLAB was used for the study;the net power obtained was 133.8162MWe. Keywords: renewable energy, ocean thermal energy conversion, closed cycle system and net powe

Experimental studies on the rheological and hydraulic performance of palm based hydraulic fluid

Development of environmental friendly hydraulic fluid has a major influence in ecologically benign environment. The use of plant oil as hydraulic fluid would help to minimize hazardous pollution caused by accidental spillage, lower disposal costs of the used fluid and meet the environmental regulations. Hydraulic test rig was built to conduct endurance test where it can be operated continuously with several safety features. This research was conducted to evaluate the rheology elements and hydraulic performance of palm based hydraulic fluid. The palm oil shows decreasing trend in volumetric efficiency as the pressure increase while the mechanical efficiency increases as the pressure increase. Properties and characteristics of palm based hydraulic fluid were evaluated via rheology study. The effect of viscosity with temperature and shear rate was studied. The influence of shear rate and temperature on the variation of viscosity was clearly observed but temperature has more significant influence. Interpretations of rheological models indicate that this palm based hydraulic fluid belongs to pseudo-plastic category. Further analysis was done to fit the experimental data with two models and the findings show that Cross rheological model fits well with the experiment data. The plant oil was used in 1000 hours operation in a hydraulic system built in Universiti Malaysia Terengganu. The overall results suggest the potential substitution of palm oil as hydraulic fluid in marine applications. Keywords: Hydraulic fluids; mechanical efficiency; palm oil; rheology; volumetric efficienc

ELECTROCHEMICAL PERFORMANCES AND CORROSION INHIBITION OF AA6061 IN TROPICAL SEAWATER

The corrosion performances of AA6061 aluminum alloy in tropical seawater was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and their morphology was characterized by the scanning electron microscopy (SEM). The results showed that the presence of sodium benzoate as an inhibitor significantly decrease the corrosion current densities (i corr ), corrosion rates and double layer capacitance (C dl ), whilst increasing the polarization resistance (R p ). The scanning electron microscopy (SEM) images indicated that the mechanism of charge transfer and the formation of thin film have been taken place on the specimens

ELECTROCHEMICAL PERFORMANCES AND CORROSION INHIBITION OF AA6061 IN TROPICAL SEAWATER

The corrosion performances of AA6061 aluminum alloy in tropical seawater was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and their morphology was characterized by the scanning electron microscopy (SEM). The results showed that the presence of sodium benzoate as an inhibitor significantly decrease the corrosion current densities (i corr ), corrosion rates and double layer capacitance (C dl ), whilst increasing the polarization resistance (R p ). The scanning electron microscopy (SEM) images indicated that the mechanism of charge transfer and the formation of thin film have been taken place on the specimens

Lawsonia Inermis as green inhibitor for corrosion protection of aluminium alloy

Corrosion behaviour of aluminium alloy inhibited by henna was investigated by using weight loss analysis, Fourier Transform Infrared (FTIR), electrochemical impedance spectroscopy (EIS) and potendiodynamic polarization study. Lawsonia inermis or also known as henna was extracted by using ethyl acetate and methanol. The result from these characterization shows that henna extracted in ethyl acetate exhibits better inhibition towards corrosion. The value for charge transfer resistance, (Rct) decreases as a result of increasing in the degree of protection of AA5083. Double layer capacitance, (Cdl) decrease indicates that a layer was form indicating the formation of a surface film. This reflects the inhibitor does retard the corrosion rate. Both solvent extract Lawsone component which is the main constituent of Lawsonia Inermis and both also were able to inhibit AA5083 in this experiment

Distribution of trace metals in pore water along Terengganu beach

The aim of this paper was to analyze some trace metal concentrations (Cd, Cu, Al, Pb and Zn) in pore water along Terengganu beach. The samples were extracted by using the APDC-MIBK solvent extraction technique and analyzed by ICP-MS. The results showed that the range of trace metal concentration in pore water for Cd, Cu, Al, Pb and Zn were 0.01 μg L-1, -0.26 μg L-1, 0.65 μg L-1, 5.01 μg L-1, 1.70 μg L-1, -28.9 μg L-1, 0.37 μg L-1, -10.5 μg L-1, 7.66 μg L-1, -271 μg L-1, respectively. In overall, trace metal concentration in pore water does not reaching the limit of Department of Environment DOE) and it is still under safety level where there are no anthropogenic effects

Removal capability of Carbon-Soil-Aquifer filtering system in water microbiological pollutants

A newly fabricated filter unit as shown in Figure 4 has been found to be significantly improved for its removal capability of microbiological hazardous materials from the filtered water. It provides a safe drinking water in the point of view of microbiological, toxicity,softening hardness and pH value. All kinds of parameters for drinking water have fulfilled the requirements as provided by this water filter unit