Electrochemical studies of mild steel corrosion inhibition in sulfuric acid chloride by aniline

The corrosion behavior of mild steel in dilute hydrochloric acid under the inhibiting action of various concentrations of aniline was studied using the weight loss and linear polarization resistance technique. The efficiency of the inhibitor increased with the increase in the inhibitor concentration. The results obtained reveal that aniline performed effectively as a corrosion inhibitor. The adsorption mechanism indicates mixed molecular interaction from values of Gibbs free energy. The values of the inhibition efficiency calculated from the two tech- niques are in reasonably good agreement. The adsorption of the inhibiting com- pound was found to obey Langmuir, Frumkin and Freudlich adsorption isotherms. The mechanism of inhibition was discussed in the light of the chemical structure of the inhibiting compound and their adsorption on steel surfaces in relation to the potentiodynamic parameters

Inhibition Effect of N, N'-Dimethylaminoethanol on the Corrosion of Austenitic Stainless Steel Type 304

The effect of N,N'-dimethylaminoethanol on the corrosion of austenitic stainless steel type 304 in 3M H2SO4 has been studied by weight-loss method and linear polarization measurement in different concentrations of the compound. The inhibition efficiencies of the inhibitor compound on the corrosion of the stainless steel were evaluated through assessment of the anodic and cathodic polarization curves of the alloy, the spontaneity of the electrochemical process, inhibition mechanism and adsorption isotherm. The inhibitor efficiency increased with increase in the inhibitor concentration. Results obtained reveal that the inhibitor performed effectively on the stainless steel providing good protection against pitting and uniform corrosion in the chloride containing acidic solutions. The compound act through physiochemical mechanism on the stainless steel surface and obeyed Langmuir adsorption isotherm. The values of the inhibition efficiency calculated from the two techniques are in reasonably good agreement. Polarization studies showed that the compounds behave as mixed type inhibitor in the aggressive media

Psychological Characteristics with the Ability to Desing Creative Artistic Product.

У статті теоретично висвітлено підходи до розуміння психологічних особливостей креативної особистості. Емпірично визначено психологічні характеристики студентів, що демонструють можливості конструювання креативного художнього продукту в процесі навчальної образотворчої діяльності. Виявлено базові психологічні особливості вказаних вище осіб. In the article in theory are reflected going near understanding of psychological features of creativity person. Empiric certainly psychological descriptions of students which demonstrate possibilities of constructing of creativity artistic product in the process of educational graphic activity. Found out the base psychological features of the higher indicated persons

The Association-Derivation Strategies of a Language Game in the Nicknames of Modern Youth

In article the possibilities of use of reception of a language (onomastichesky) language game for creation of nicknames among young people are considered; the associative and derivational strategy of a language game from the point of view of a world picture projection in language reflection of nicknames are characterized.В статье рассматриваются возможности использования приема языковой игры для создания прозвищ в молодежной среде

Knowledge structures and their representation in the language

The authors define and describe the components which build the structure of the frame "touch

Current trends in global demographic processes

Current local and national demographic trends have deepened the existing and formed new global demographic processes that have received a new historical reasoning that requires deep scientific research taking into account the influence of the multifactorial global dimension of the modern society development. The purpose of the article is to study the development of global demographic processes and to define the causes of their occurrence, manifestations, implications and prospects for implementation in the first half of the 21st century. The authors have identified and characterized four global demographic processes, namely population growth, migration, increase of tourism, and change in population structure. It is projected that in the 30’s of the 21st century, the number and growth rates of the world population will reach the objective growth and these dynamics over the next two decades will begin to change in the direction of reducing the growth rates, which will lead to gradual stabilization, and eventually reduce the size of the world population. By the middle of the 21st century, one can observe the preservation of the growth rates of international and domestic migration, the growth of international migration flows from the South to the North and from the East to the West, the strengthening of new economically developed centers of gravity (Canada, Australia and New Zealand), the increase in migration of rural population to cities, as well as urbanization and activation of the metropolises development. The share of international tourists in comparison with the world population will be constantly increasing, and the annual growth rate of the number of international tourists will significantly depend on the world economy and may vary at the several percent level. Permanent change will occur in the age, religious-cultural and socio-economic structure of the population

Inhibition effect of 2-amino-5-ethyl-1, 3, 4-thiadiazole on corrosion behaviour of austenitic stainless steel type 304 in dilute HCl solution

The corrosion inhibition of type 304 austenitic stainless steel by 2-amino-5-ethyl-1, 3, 4-thiadiazole (TTD) compound and the electrochemical behaviour in dilute HCl solution were investigated through potentiodynamic polarization test, mass loss techniques and potential measurements. The results show that the organic derivative is highly effective with a maximum inhibition efficiency of 70.22% from mass loss analysis, while 74.2% is obtained from polarization tests. Observation of the scanning electron micrographs shows the absence of corrosion products due to electrochemical influence of TTD on the surface morphology of the steel. X-ray diffractometry reveals the absence of phase compounds and complexes on the steel samples after exposure. TTD adsorption on the steel surface obeys the Langmuir, Frumkin and Freundlich adsorption isotherms. Corrosion thermodynamic calculations reveal the inhibition mechanism occurs through chemisorption process and results from statistical analysis depict the strong influence of inhibitor concentration on the electrochemical performance of the TTD

Inhibition Effect of 2-Amino, 5-Ethyl- 1, 3, 4 Thiadiazole on the Corrosion of Austenitic Stainless Steel Type 304 in Dilute Sulphuric Acid

The inhibition effect of 2- amino, 5- ethyl- 1, 3, 4 thiadiazole (TTD) compound on the corrosion of type 304 stainless steel in 3 M H2SO4 test solution was investigated using potentiodynamic polarization, weight loss techniques and open circuit potential measurements. Results showed TTD to be very effective with an average inhibition efficiency of 98% from weight loss analysis and 87% from polarization test. Data from open circuit potential measurement are well within passivation potentials at specific concentrations of TTD. Scanning electron microscopy showed the effect of the inhibiting compound on the surface topography of the steel, while X - ray diffractometry determined the phase compounds formed on the surface due to inhibitor adhesion. Adsorption of the compound was determined to obey the Langmuir isotherm model. Thermodynamic calculations showed the inhibition process occurred through chemisorption mechanism and results from statistical analysis revealed the overwhelming influence of inhibitor concentration over exposure time on the inhibition performance of the compound

Inhibition effect of butan-1-ol on the corrosion behavior of austenitic stainless steel (Type 304) in dilute sulfuric acid

The electrochemical behavior of austenitic stainless steel (Type 304) in 3 M sulfuric acid with 3.5% recrystallized sodium chloride at specific concentrations of butan-1-ol was investigated with the aid of potentiodynamic polarization, open circuit measurement and weight loss technique. Butan-1-ol effectively inhibited the steel corrosion with a maximum inhibition efficiency of 78.7% from weight-loss analysis and 80.9% from potentiodynamic polarization test at highest concentration studied. Adsorption of the compound obeyed the Freundlich isotherm. Thermodynamic calculations reveal physiochemical interactions and spontaneous adsorption mechanism. Surface characterizations showed the absence of corrosion products and topographic modifications of the steel. Statistical analysis depicts the overwhelming influence and statistical significance of inhibitor concentration on the inhibition performanc