10.14489/td.2014.04.pp.045-054

2014, 04 April

DOI: 10.14489/td.2014.04.pp.045-054

Lipkina T.V., Lipkin S.M., Narochnaya V.M., Kucherenko S.V., Gaydar A.I., Astahov A.S., Kucherenko E.I., Pozidaeva S.A., Shishka V.G.
A PREDICTION OF PROTECTIVE PROPERTIES OF HEAT SURFACE OXIDE FILMS OF HEATPOWER EQUIPMENT
(pp. 45-54)

Abstract. Features of estimation and prediction of stainless steels oxide films protective properties for water-vapor corrosion are concerned. These films are formed on the surface of steels by vapor-water treatment. The aim of investigation was infinding most important factors, which determine the rate of precipitate accumulation, protective propertiesof oxide films, and its mechanical strength. Voltammetry, AC-impedance, chronopotentiometric methods, combined with SEM and X-ray, were used as experimental methods. All tests were made on the control cutting examples of pipelines. It was obtained, that corrosion rate is determined by a part of free surface, calculated from voltammetry data on coated and free surface, inner layer thickness, calculated from cathodicpulse chronopotentiometric curves in alkaline electrolyte, active component of AC-impedance of films in alkaline electrolyte, phase composition of films, which is identified and formalized from cathodic pulse chronopotentiometric curves in acidic electrolyte. As a result electrochemical corrosion mechanism was proposed and quantitativemodel of corrosion rate and mechanical strength of the films in the multiple regression form. This form gives a features of corrosion rate and mechanical strength of the films calculation on the base of surface parameters.

Keywords: heat surface, protectivefilms, voltammetry, chronopotentiometric, AC-impedance, inner layer of film, corrosion rate, multiple regressionequation, protonic conductivity, cathodic corrosion process, phases of protective films, vapor-water treatment, electrochemical express-analysis.

+ - About the Authors Click to collapse

T. V. Lipkina, S. M. Lipkin
Platov South-Russian State Polytechnic University (NPI), Novocherkassk, Russia

A. I. Gaydar
Federal Public Budgetary Scientific Institution “Research Institute of Perspective Materials and Technologies”, Moscow, Russia

V. M. Narochnaya, E. I. Kucherenko
OGK-2 Branch Novocherkassk State District Power Plant, Novocherkassk, Russia

A. S. Astahov
Chemistry Don State Agrarian University, Platov South-Russian State Polytechnic University (NPI), Novocherkassk, Russia

S. V. Kucherenko
Chemistry Don State Agrarian University, Novocherkassk, Russia. E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

S. A. Pozidaeva
Platov South-Russian State Polytechnic University (NPI), Federal State Unitary Enterprise "Orion", Novocherkassk, Russia

V. G. Shishka Federal State Unitary Enterprise "Orion", Novocherkassk, Russia

+ - References Click to collapse

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