Improving the Anticorrosion Characteristics of Polymer Coatings in the Case of Their Modification with Compositions Based on Organosilanes

Protection of Metals and Physical Chemistry of Surfaces - The effect of a series of organosilanes and their mixtures with corrosion inhibitors on the anticorrosion properties of polymer and paint...     

A study of the initial stages of iron passivation in neutral solutions using the quartz crystal resonator technique

The initial period of growth of a passive film of iron in borate solutions (pH 7.4 and 6.7) is studied using the quartz crystal resonator technique (EQSN) and pulsed chronoamperometry. Dependences of the surface layer thickness on time are obtained at the metal passivation and prepassivation potentials. Regions corresponding to different stages of passive layer formation are found in anodic current transients, which allowed the ambiguous effect of atomic hydrogen on kinetics of hydrogenated iron dissolution to be explained. It is shown that the iron hydrogenation promoter prevents formation of a primary passive film by accelerating iron dissolution at prepassivation potentials.     

The effect of hydrogen sorbed by iron on anodic dissolution of metal in sulfate electrolytes

The mechanism of anodic dissolution of hydrogenated iron in sulfate electrolyte (pH 5.5) is studied with the use of electrochemical impedance spectroscopy in combination with bipolar membrane electrode. Based on comparison of rate constants of elementary stages of the anodic process in acidic (pH 1.3) and weakly acidic (pH 5.5) sulfate electrolytes, the reaction scheme of active dissolution of iron is made more accurate.     

The process of recovering solvent vapors in successive layers of granular or fibrous carbon adsorbence

Conclusions -- Results have been given of a study of the process of recovery of acetone and toluene vapor by a fibrous-granular carbon tower consisting of activated carbon fibre of the Aktilen^R type and granular activated carbon.-- It has been found that such a tower permits one to increase the degree of utilization of the adsorptive capacity of the adsorbents with respect to the less well sorbed component (acetone) in the investigated mixture of organic solvents, and to increase the duration of protective action. This facilitates processes of separating the recovered mixture of volatile solvents.Translated from Khimicheskie Volokna, No. 4, pp. 40–42, July–August, 1990.     

Mechanical Properties and Corrosion Resistance of Hard β-W based CVD Coatings in Aqueous NaCl Solution

Protection of Metals and Physical Chemistry of Surfaces - The paper presents the results of studying the mechanical and anticorrosive properties of coatings based on the metastable tungsten phase...     

Corrosion and Electrochemical Behavior of β-W CVD Coatings in NaCl Solution

Protection of Metals and Physical Chemistry of Surfaces - The paper presents the results of a study of the corrosion-electrochemical behavior of coatings based on the metastable phase of tungsten...     

Dissolution of Iron and Ionization of Hydrogen in a Neutral Borate Buffer under a Cyclic Potential Pulse

Protection of Metals and Physical Chemistry of Surfaces - Abstract—When the potential step is cycled between the values corresponding to the regions of iron pre-passivity and cathodic...     

The Corrosion and Electrochemical Behavior of Tungsten-Based CVD Coatings in Alkaline Aqueous Solutions

Protection of Metals and Physical Chemistry of Surfaces - The results of corrosion-resistance analysis for tungsten-based coatings obtained by means of low-temperature chemical-vapor deposition...     

The influence of zinc cations on steel oxidation in nitrate solutions

The influence of zinc nitrate additives on the protective properties of the magnetite coating (MC) obtained by the oxidation of low-carbon steel in the nitrate solution at temperatures of 96–98°C has been studied by physical, electrochemical, and corrosion methods. It has been shown that, under these conditions, iron zinc spinel ZnFeO₄, which is introduced into an MC, can be formed. Low concentrations ($ C_{Zn(NO_3 )_2 } $ C_{Zn(NO_3 )_2 } = 25–150 mg/l) of it increase the corrosion stability of steel with MC in water containing chlorides and sulfates and also at the periodic moisture condensation of the sample surface. At $ C_{Zn(NO_3 )_2 } $ C_{Zn(NO_3 )_2 } > 500 mg/l, MC formation stops.     

On inhibiting the iron anodic dissolution in acid sulfate electrolyte by tetrabutylammonium cations

The surface coverage with atomic hydrogen (θ_H) is calculated for iron electrode as a function of the number of adsorbed tetrabutylammonium cations and hydrogen concentration in the metal phase (C _H). It is shown that the effect of the organic inhibitor of acid corrosion on the rate of iron potentiostatic dissolution is due to the increase in the θ_H/C _H ratio. Original Russian Text ? A.I. Marshakov, T.A. Nenasheva, A.A. Rybkina, M.A. Maleeva, 2007, published in Zashchita Metallov, 2007, Vol. 43, No. 1, pp. 83–89.