scholarly journals Anodic behaviour of Zn0.5Al doped with molybdenum in acidic, neutral and alkaline media

2021 ◽  
Vol 11 (2) ◽  
pp. 187-194
Author(s):  
Z. R. Obidov ◽  
P. R. Ibrohimov ◽  
F. A. Rahimov ◽  
I. N. Ganiev
Keyword(s):  
Sweep Rate ◽  
Potential Sweep Rate ◽  
Alkaline Media ◽  
Favourable Effect ◽  
Neutral Medium ◽  
Potential Sweep ◽  
Stationary Potential ◽  
Zinc Alloys ◽  
Anodic Behaviour ◽  
Acidic And Alkaline Media

The paper presents the results of a potentiodynamic study of the anodic behaviour of Zn0.5Al doped with molybdenum in the acidic (0.1 M, pH = 1; 0.01 M, pH = 2; 0.001 M, pH = 3), neutral (0.03, 0.3, 3%, pH = 7) and alkaline (0.001 M, pH = 10; 0.01 M, pH = 11; 0.1 M, pH = 12) media of HCl, NaCl and NaOH electrolytes. In the potentiodynamic mode with an electrode potential sweep rate of 2 mV/s, all Zn0.5Al-Mo samples containing from 0.01 to 1.0 wt% of molybdenum demonstrated a shift in the potentials of corrosion, pitting formation and repassivation. These potentials shift towards negative values in acidic and alkaline media, while shifting to positive values in a neutral medium. It was established that an increase in the concentration of electrolytes led to a shift of all the considered potentials towards negative values in all media - acidic, neutral and alkaline. This dependence is associated with the specific features of the process of anodic dissolution of alloys during the formation of an oxide film on their surface. The significance of the dependence of the stationary potential of free corrosion of alloys on time for establishing the passivity of surfaces in acidic, neutral and alkaline media was shown. It was determined that zinc alloys doped with molybdenum are resistant to pitting corrosion in all the investigated media. This resistivity is particularly high in acidic (0.001 M), neutral (0.03%) and alkaline (0.001 M) media of HCl, NaCl and NaOH electrolytes. The favourable effect of molybdenum on both the anodic behaviour of Zn0.5Al and the overall increase in the corrosion resistance of alloys was demonstrated. In comparison with undoped Zn0.5Al alloys, the corrosion rate of alloys doped with molybdenum (0.01-1.0 wt%) is 2-2.5 times lower. The proposed compositions of Zn0.5Al-Mo alloys can be used as noncorrosive coatings for steel products.

Growth of Ultra-thin Titanium Dioxide Films by Complete Anodic Oxidation of Titanium Layers on Conductive Substrates

2012 ◽  
Vol 1494 ◽  
pp. 159-164
Author(s):  
Karsten Wolff ◽  
Petri Heljo ◽  
Donald Lupo
Keyword(s):  
Titanium Dioxide ◽  
Anodic Oxidation ◽  
Defect Density ◽  
Ph Value ◽  
Sweep Rate ◽  
Potential Sweep Rate ◽  
Minor Role ◽  
Potential Sweep ◽  
Titanium Dioxide Films ◽  
Conductive Substrates

ABSTRACTThe growth of thin and ultra-thin titanium dioxide layers was investigated. Oxide films were grown by galvanostatic and potentiodynamic anodisation of evaporated titanium layers on conductive substrates. It is shown that thin-film oxidation differs significantly from anodic oxidation of solid foils or plates, due to the sudden stop of anodisation process before complete oxidation of the thick films. Depending on the pH value and the potential sweep rate, the effective defect density and the dielectric constant of the anodized layers vary from 3·1019 cm-3 to 1020 cm-3and from 16 to 27, respectively, whereas the electrolyte temperature plays only a minor role.

scholarly journals EFFECT OF CALCIUM ON THE ANODIC BEHAVIOR OF ALUMINUM CONDUCTOR ALLOY AlTi0.1 IN THE MEDIUM OF THE ELECTROLYTE NaCl

2021 ◽  
Vol 58 ◽  
pp. 33-37
Author(s):  
Izatullo N. Ganiev ◽  
◽  
Rustam J. Fayzulloev ◽  
Furkatshokh Sh. Zokirov ◽  
◽  
...  
Keyword(s):  
Experimental Study ◽  
Aluminum Alloy ◽  
Corrosion Rate ◽  
Sweep Rate ◽  
Potential Sweep Rate ◽  
Anodic Behavior ◽  
Potential Sweep ◽  
Potentiostatic Method ◽  
Corrosion Pitting ◽  
Range Of Values

The article presents the results of an experimental study of the effect of calcium on the anodic behavior of the aluminum alloy AlTi0.1, in the medium of NaCl electrolyte. The study was carried out by the potentiostatic method in the potentiodynamic mode at the potential sweep rate of 2 mV / s. It is shown that the modification of the aluminum alloy AlTi0.1 with calcium promotes the displacement of the potentials of free corrosion, pitting formation, and repassivation to the positive range of values. The corrosion rate of the aluminum alloy AlTi0.1 when modified with 0.01-0.5 wt % calcium decreases by 10-17 %.

scholarly journals INFLUENCE OF ALKALINE – EARTH METALS ON ANODIC BEHAVIOR OF ALLOY ССУЗ IN NEUTRAL ENVIRONMENT OF THE ELECTROLYTE NaCl

2018 ◽  
pp. 84-89
Author(s):  
I. N. Ganiev ◽  
O. Kh. Niyezov ◽  
N. M. Mulloeva ◽  
B. B. Eshov
Keyword(s):  
Corrosion Rate ◽  
Current Density ◽  
Alkaline Earth ◽  
Chloride Ion ◽  
Sweep Rate ◽  
Potential Sweep Rate ◽  
Alkaline Earth Metals ◽  
Anodic Behavior ◽  
Potential Sweep ◽  
Antimony Alloy

The anodic behavior of a lead-antimony alloy (3 wt% Sb) doped with alkaline-earth metals was investigated in potentiostatic method in the potentiodynamic mode at a potential sweep rate of 2 mV/s and it was shown that with an increase in the content of alkaline earth metals in the alloy (SSUZ), the potentials of free Corrosion and pitting are slightly shifted to the positive region. As the concentration of the chloride ion in the electrolyte increases, these potentials decrease. The current density of corrosion and, accordingly, the corrosion rate of alloys with an increase in the content of alkaline earth metals are reduced by 75–85%, and the concentration of chloride ion increases.In transition from alloys with calcium to alloys with strontium, the corrosion rate of alloys increases by 20–30%, and to alloys with barium it decreases by 25–30%.

scholarly journals Anodic Dissolution of Non-Ferrous Metals in a Glycerate-Alkali Electrolyte

2020 ◽  
Vol 989 ◽  
pp. 569-573
Author(s):  
Vladimir A. Valnev ◽  
Vladimir G. Lobanov ◽  
Lev A. Lubnin
Keyword(s):  
Sodium Hydroxide ◽  
Anodic Oxidation ◽  
Anodic Dissolution ◽  
Precious Metals ◽  
Sweep Rate ◽  
Potential Sweep Rate ◽  
Potential Sweep ◽  
Ferrous Metals ◽  
Non Ferrous Metals ◽  
Alkali Electrolyte

Studies have been conducted to assess the possibility of refining a lead collector containing precious metals, with the aim of obtaining lead using an economically viable technology. Studied the patterns of anodic oxidation of lead and impurities in alkaline-water-glycerate electrolytes, depending on the concentration of sodium hydroxide and glycerol in the electrolyte, the potential sweep rate.

scholarly journals Electrodeposition and Growth of Iron from an Ethylene Glycol Solution

2021 ◽  
Vol 68 (1) ◽  
pp. 185-192
Author(s):  
Vusala Asim Majidzade ◽  
Akif Shikhan Aliyev ◽  
Mahmoud Elrouby ◽  
Dunya Mahammad Babanly ◽  
Dilgam Babir Tagiyev
Keyword(s):  
Ethylene Glycol ◽  
Effective Activation Energy ◽  
Sweep Rate ◽  
Potential Sweep Rate ◽  
X Ray Diffraction ◽  
Potential Sweep ◽  
X Ray ◽  
Reduction Of Iron ◽  
Glycol Solution ◽  
Optimized Conditions

The electrochemical reduction of iron (III) ions into zero-valent iron from a solution of ethylene glycol was accomplished. The kinetics and mechanism of the electroreduction process were investigated by cyclic and linear polarization techniques. The influence of temperature, potential sweep rate, and concentration of iron (III) ions on the electroreduction process was also studied. The observed values of effective activation energy revealed that the investigated electroreduction process is accompanied by mixed kinetics control. Moreover, the results of SEM and X-ray diffraction analysis confirmed the deposition of thin Fe films under the optimized conditions.

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