About Dr. Ishaq Zaafarany

Chemistry Department, Faculty of Applied Sciences, Umm Al-Qura University, Makkah Al-Mukarramah 13401, Saudi Arabia Kingdom
E-Mail: iazaafarany@uqu.edu.sa, Mobile: 0503599574, P.O.BOX: 118 Makkah, Saudi Arabia

Field of Specialization
Physical chemistry, inorganic chemistry, electrochemistry, corrosion, radiochemistry.

Conferences
Fourth Saudi Science Conference, Taibah International Chemistry Conference, National chemistry Conference, 12th Middle East Corrosion Conferences & Exhibition, Corrosion and Protection of Metals. Ibn Sina Conferences...etc.

Membership
Saudi Chemical Society. The Materials Information Society (ASM). Nominated for Who’s Who in the World Editions. Arab School for Science and Technology. NACE International. American Chemical Society. Royal Society of Chemistry. IAEA. AAEA.

Academic Record
Member of the Chemistry department Scientific Research Committee.
Academic Tutor and the department registrar.
Supervisor of General and Physical Chemistry Education Committee.

Teaching Duties
General chemistry, Physical Chemistry, Inorganic Chemistry, Teaching Safety in general labs

Research interest
Material Science, Environmental Chemistry, Polymers as Corrosion inhibitors, Neutron Activation Analysis

Please find bellow all articles from this author which were published in our journal. Lists with articles the author published in our or other journals, can be found at the following databases:

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Dr. Ishaq Zaafarany

Non ionic surfactants derived from phenol compounds as inhibitors for corrosion of aluminum in hydrochloric acid solution

The chemical structure of three non ionic surfactants derived from phenol compounds

Inhibition of aluminum corrosion in 1M HCl in absence and presence of three compounds of non ionic surfactants compounds derived from phenol was investigated using hydrogen evolution reaction, weight loss galvanostatic polarization and electrochemical impedance spectroscopy techniques. It was found that the percentage inhibition increases with increasing the concentration of inhibitor, amount of ethylene oxide unit and with decreasing temperature. The inhibitive action of non ionic surfactant compounds was explained in terms of blocking the electrode surface by adsorption process. The adsorption process follows Langmuir isotherm. The polarization measurements showed that these inhibitors are acting as mixed inhibitors for both cathodic and anodic reaction. Electrochemical impedance spectroscopy technique exhibit one capacitive loop indicating that, the corrosion reaction is controlled by charge transfer process. Some activated thermodynamic parameters are calculated and explained.


    

Coumarin Derivatives as Corrosion Inhibitors for Zinc in HCl Solutions

(a) 4-hydroxy - coumarin

The inhibiting effect of some coumarin derivatives toward the corrosion of Zinc in 0.1M HCl solution was studied using weight loss and galvanostatic polarization techniques. Addition of KI to acidic medium containing the coumarin derivatives increases the inhibition efficiency of the system. The obtained results showed that the inhibition efficiency of these compounds increased by increasing their concentrations and decreased by rising the temperature, so that the adsorption of these compounds is physically adsorbed on the zinc surface. Temkin’s adsorption isotherm fits the experimental data for the studied compounds. Some thermodynamic parameters for the adsorption and activation process were computed. The values of Tafel slopes indicate that these compounds act as a mixed type inhibitors but cathode is more polarized when an external current was applied. The inhibitors are explained in terms of adsorption on the zinc surface. The order of inhibition efficiency are interpreted on the basis of the molecular structure, the subsistent groups and their charge densities of the coumarin derivatives.


    

Kinetics of Corrosion Inhibition of Aluminum in Alkaline Solutions by Water-Soluble Poly (Vinyl Alcohol) as Synthetic Polymer

Figure 1.

The influence of water-soluble poly (vinyl alcohol) (PVA) as a synthetic polymer containing secondary alcoholic groups on the rate of dissolution of aluminum (Al) metal in alkaline medium has been investigated using both gasometric and weight-loss techniques. The results showed that addition of poly (vinyl alcohol) to the tested solutions leads to a remarkable decrease in the corrosion rates of Al in alkali. The magnitude of inhibition efficiency was determined and compared to that obtained with other macromolecules containing secondary alcoholic groups. The inhibition action of PVA on Al metal surface was found to obey Freundlich adsorption isotherm. Factors affecting the corrosion process such as the concentration and nature of the inhibitor, concentration of the corrosive medium and the temperature were examined. A tentative inhibition mechanism consistent with the kinetic results obtained is suggested and discussed.