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RISS 인기검색어
- 검색키워드
- 저자 : Ahmed Y. Musa (검색결과 5 건)
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Inhibition of aluminum corrosion by phthalazinone and synergistic effect of halide ion in 1.0 M HCl
Ahmed Y. Musa,Abdul Amir H. Kadhum,Abu Bakar Mohamad,Mohd Sobri Takriff,Eng Pei Chee 한국물리학회 2012 Current Applied Physics Vol.12 No.1
The inhibitive effects of 1-(2H)-phthalazinone (PTO) for aluminum alloy (2024) corrosion in 1.0 M HCl solution and the synergistic effect of KI on the corrosion inhibition efficiency were assessed using electrochemical measurements. Results showed that the inhibition efficiency increased with an increase in concentration of the PTO and synergistically increased with addition of KI. Adsorption characteristic of PTO molecules in absence and presence of KI was approximated by Freundlich and Langmuir adsorption isotherm models, respectively. The synergistic effect is found to decrease with increase in the concentration of PTO and a competitive inhibition mechanism exists between KI and PTO cations.
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Ahmed Y. Musa,Abu Bakar Mohamad,Abdul Amir H. Kadhum,Mohd Sobri Takriff,Waleed Ahmoda 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
Quantum chemical calculations were performed on ten thio compounds using semi-empirical method PM3 within program package of Material Studio 5.5. The effect of molecular structure on the corrosion inhibition efficiency was investigated using the quantum chemical calculations. The electronic properties such as highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO) energy levels, (LUMO–HOMO) energy gap, dipole moment (l) and fraction of electron transfer (DN) were calculated and discussed. A relationship between the corrosion inhibition efficiency and several quantum parameters was established with coefficient correlation (R2) of 0.8894.
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Galvanic corrosion of aluminum alloy (Al2024) and copper in 1.0M hydrochloric acid solution
Ahmed Y. Musa,Abu Bakar Mohamad,Ahmed A. Al-Amiery,Lim Tien Tien 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.6
The corrosion of an aluminum alloy (Al2024) and copper in 1.0M HCl solution was investigated at 30,40, 50 and 60 oC using open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) measurements. The galvanic corrosion of Al2024 and copper was studied using the zero resistance ammeter (ZRA) method. Galvanic current densities (Ig) and galvanic potential (Eg) were measured at 30 oC in 1.0M HCl solution. Thermodynamic parameters, such as activation energy (Ea), enthalpy of activation (ΔHa) and entropy of activation (ΔSa), were calculated and discussed. The results indicated that the corrosion rates of both Al2024and copper increased with temperature. The ZRA results demonstrated that Al2024 is a sacrificial anode in 1.0M HCl solution when coupled with copper.
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Abu Bakar Mohamad,Abdul Amir H. Kadhum,Ahmed A. Al-Amiery,Lim Chai Ying,Ahmed Y. Musa 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.3
Synergistic effects of the addition of KI on the corrosion inhibitive performance of a coumarin derivative on analuminum alloy in 1.0 M H2SO4 at different temperatures were studied using various electrochemicalmeasurements. Density functional theory was used to calculate the quantum chemical parameters of thecoumarin derivative. The experimental results showed that the coumarin derivative is considered as a mixedtypeinhibitor. The corrosion potential values were almost unchanged upon the addition of PBBC to the acidicsolution. The inhibition efficiency increases with increasing inhibitor concentration and increases further inthe presence of 6.02 mM KI but decreases significantly at higher temperature. The adsorption of PBBC obeyedthe Langmuir isotherm, and being chemically adsorbed at lower temperatures, while physical adsorption isfavoured at higher temperature. The theoretical results indicated that the coumarin derivative was adsorbedonto the surface of Al2024 through the sulfur, oxygen and nitrogen atoms.
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Corrosion Inhibition of Copper-nickel Alloy: Experimental and Theoretical Studies
Khadom, Anees A.,Yaro, Aprael S.,Musa, Ahmed Y.,Mohamad, Abu Bakar,Kadhum, Abdul Amir H. Korean Chemical Society 2012 대한화학회지 Vol.56 No.4
The corrosion inhibition of copper-nickel alloy by Ethylenediamine (EDA) and Diethylenetriamine (DETA) in 1.5M HCl has been investigated by weight loss technique at different temperatures. Maximum value of inhibitor efficiency was 75% at $35^{\circ}C$ and 0.2 M inhibitor concentration EDA, while the lower value was 4% at $35^{\circ}C$ and 0.01 M inhibitor concentration DETA. Two mathematical models were used to represent the corrosion rate data, second order polynomial model and exponential model respectively. Nonlinear regression analysis showed that the first model was better than the second model with high correlation coefficient. The reactivity of studied inhibitors was analyzed through theoretical calculations based on density functional theory (DFT). The results showed that the reactive sites were located on the nitrogen (N1, N2 and N4) atoms.
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