corrosion

Food Additives as Factor of Corrosion of Mild Steel in Neutral Solution

It has been showed that food additives E451 and E459 inhibit corrosion in neutral water-salt medium and additives E316, E631, E621, E631+E551, herbs and spices increased it up to 1.75 times. Under microbial corrosion condition, inducted by sulfate-reducing bacteria, inhibition action (up to 80.9%) was discovered only for additive E459. Other studied additives increased microbial corrosion up to 2.27 times. The presence of food additives in corrosive medium influences the quantity of sulfate-reducing bacteria in biofilm on steel surface.

Complex Corrosion Protection of Tubing in Gas Wells

Analysis of the efficient complex application of zinc coatings such as sherardizing on tubing surface and carbon dioxide inhibitors during the natural gas extraction on Lutsenkivske gas condensate deposit wells has been carried out. Microstructural and electrochemical investigations of zinc diffusion layer have been conducted. Existing industrial experience shows that the complex corrosion protection significantly increases the life of wells, which significantly increases the economic performance and prevents environmental pollution.

Production of Corrosion Inhibitors for Oil Refining Equipment Using Natural Components

It is proposed to use plant and animal raw materials to produce corrosion inhibitors of oil refining equipment. The corrosion inhibitors based on vegetable oil and animal fat with di- and triethanolamine have been synthesized, nitrogen-containing corrosion inhibitors have been obtained, their physical and chemical parameters have been determined. By using the gravimetric method the protective effect of the received inhibitors was determined on St20 steel in a two-phase corrosive environment simulating the preliminary preparation conditions of oil at electro-salting and dehydration plants.

Modeling quality of underground pipelines in the conditions of corrosive fatigue

The presence of fatigue cracks on the surface of metallic underground pipelines sharpens the problem of calculation values of strength characteristics at the action of corrosive environments, that did not find the complete decision nowadays. In this connection it is needed to correct the row of defects and normative and technical documents related to insufficient actuality of corresponding.

Corrosion-mechanical resistance of arc-sprayed coatings made from cored powders

Result of investigations of resistance against corrosion and mechanical resistance of obtained by means of arc-spray metallization (with the use of cored wires) coatings are presented. The cored wires (CWs) enable us to regulate the chemical composition and, consequently, properties of the deposited coating in a wide range.

Вплив модифікованого алюмосилікату на захисні властивості алкідних покриттів

It was established that natural and Ca modified zeolite inhibit steel corrosion in the medium of low acid rain. The Ca-containing zeolite inhibit the steel corrosion in the most effective way. The protective effectiveness of the alkyd coatings filled with zeolites can be placed in the following order:  unmodified < with natural zeolite < with Ca-containing zeolite.  Встановлено, що природний та модифікований кальцієм цеоліти інгібують корозію сталі в середовищі слабкокислих дощових опадів. Найефективніше інгібує корозію сталі Ca-вмісний цеоліт.

Вивчення інгібування корозії вуглецевої сталі методом імпедансної спектроскопії

The inhibitory action of nitrogen- and oxygen-containing inhibitors has been investigated by impedance spectroscopy using commercial Armco iron in 0,1 M solution of hydrochloric acid with butanol. The mechanism of blocking effect of the studied compounds has been determined. Методом імпедансної спектроскопії досліджено захисні властивості інгібіторів корозії з нітроген- та оксигенгрупами на промисловому варіанті заліза Армко в 0,1 М розчині соляної кислоти з бутанолом. Визначено механізм блокувального ефекту досліджуваних речовин.

Захисна дія інгібіторів корозії під час репасивації алюмінію

The protective effect of chromate and phosphate inorganic corrosion inhibitors on the mechanically activated aluminium surface was studied. It was determined that the value of the electrode potential of aluminum during its repassivation in the control and inhibited corrosive environments was 100-400 mV lower than at free corrosion, which indicates the possibility of galvanic interaction between activated and not damaged areas of metal. Aluminium repassivation rate was highest in uninhibited and chromate inhibited solutions and somewhat lower in phosphate solution.

Нормативні вимоги щодо контролю параметрів корозійного стану підземних трубопроводів

Розроблено рекомендації щодо поєднання в нормативному документі вимог контролю ступеня захищеності підземних трубопроводів із сталі в корозійному середовищі з позицій електрохімії і механіки деформівного твердого тіла
***Recommendations in relation to combination in the normative document of requirements in relation to control of degree of security of underground pipelines from steel in a corrosive environment from positions of electrochemistry and mechanics of deformable solid are worked out***

Methods of salt content stabilization in circulating water supply systems

The effect of corrosion inhibitors and microbiocides presented in circulating water supply systems on the corrosion rate of structural materials has been studied. It is shown that using the mixture of zinc phosphonates aqueous solutions, special polymeric dispersants and microbicides based on bromine and quaternary ammonium salts provides dissolution of calcium carbonate deposits and the corrosion rate of steel materials at the lowest level. Rational modes of circulating water chemical treatment are proposed, which increase operational reliability.