The Study of the Destruction of Pipelines, Subject to Stress Corrosion Cracking
O.A. Nasibullina, R.G. Rizvanov
Abstract
Stress corrosion cracking (SCC) is one of the reasons of failure of main gas pipelines. SCC appears in the form of the single and multiple cracks arising on an outer surface of a pipe. In work different types of the analysis of destruction of the pipeline having multiple cracks are presented. For the purpose of studying of a number of features of SCC by authors various researches were conducted: electrochemical researches, potentiodynamic measurements at various temperatures. With the help of potentiometric studiesit is shown that at low temperatures process of formation of a passive film is at a loss, however, with temperature increase processes of oxidation of metals proceed much quicker, at the same time decrease of their thermodynamic opportunity is observed. The nature of temperature effect is defined on oxidation rate of metals by temperature dependence of a kinetic constant of chemical reaction that is expressed by the Arrhenius equation.