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PUBLICATION 2010

 

NUR HAZWANI DAHON

 

2010

 

A STUDY OF CORROSION INHIBITOR OF MILD STEEL BY CARBOXYMETHYLCHITOSAN IN 1 M hcl

N. Nu’aim Razali, M. Jain Kassim*, M. Hazwan Hussin, N. Hazwani Dahon and T. Kang Wei

Material Chemistry and Corrosion Laboratory, School of Chemical Sciences, Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia.

*Corresponding author: Alamat emel ini dilindungi dari Spambot. Anda perlu hidupkan JavaScript untuk melihatnya..

The inhibition effect of commercial carboxymethyl chitosan (CMC) on the corrosion of mild steel in 1 M HCl was studied by various techniques such as weight loss measurement, polarization and electrochemical impedance spectroscopy (EIS). It was found as the inhibition efficiency increase directly with the concentration of CMC. The highest inhibition efficiency for all tests was obtained at the concentration of 7 x 10-4 M. Polarization studies show that CMC behaves as mixed-type inhibitor and predominantly inhibit at the cathodic site. EIS technique revealed that the corrosion inhibition of mild steel was mainly controlled by charge transfer process. The values of activation energy (Ea) for mild steel corrosion inhibition and various thermodynamic parameters were also calculated. The adsorption nature of mild steel corrosion inhibition follows the Langmuir adsorption isotherm.

Keywords: CMC; chitosan; mild steel; corrosion inhibition.

 

 

CHE HAZIQAH CHE HUSSIN

 

2010

 

General differential transformation method for higher order of linear boundary value problem

Che Haziqah Che Hussin1, Adem Kilicman2 & Arif Mandangan3

1Preparatory Centre for Science and Technology, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia.

1,2Department of Mathematics, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.

3School of Science and Technology, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia.

In this paper, we propose the generalization of differential transformation method to solve higher order of linear boundary value problem. Previous studies show that the differential transformation method is a powerful method to solve several lower order linear boundary value problems. In our study, we generalized the method so that one can solve