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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.
Khalid H. Rashid,Anees A. Khadom,Hameed B. Mahood 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
The behavior of anodic porous alumina film formed on an aluminum surface by anodizing in chromic acid solutions wasoptimized using Box–Wilson experimental design. The film thickness was correlated as a function of temperature, acidconcentration, applied voltage, and time. A mathematical model was suggested and optimized. Results of coating thicknessindicate that both temperature and time play an important role in the anodizing process. The interaction effect of variableson the film thickness is less pronounced compared with the effect of the main variables. Optimum film thickness obtainedduring the anodizing process was 10.43 μm at the optimum value of temperature (45 °C) and time (68 min). The polarizationmeasurement of anodized aluminum ASA 6061 in chromic acid shows a high corrosion resistance in the presence ofcoating. The results confirmed by using surface morphology investigations.