Sysyn G. Estimation of pipe steels local corrosion damages by the method of microelectrochemical investigations

The pipe steels corrosion and their weld with different microelectrochemical heterogeneity of surface. It was established of correlation between by corrosion rate and microelectrochemical heterogeneity of pipe steels and their weld joints and determination of corrosion influence in different aggressive environments on changing their surface local electrode potentials by the method of microelectrochemical investigations in a mobile drop of electrolyte. Methods - microelectrochemical, mechanical, electrochemical, electronic and optical microscopy. It was developed the new method of microelectrochemical investigations in a mobile drop of electrolyte for the continuous scanning of metal surfaces. Influence of capillary, nature and volume of electrolyte was established on changing of local electrode potentials of surface. It was evaluated of correlation between by corrosion rate of steel 20 in different aggressiveness environments and microelectrochemical heterogeneity of surface and certainly influence of the last on propensity to corrosion-mechanical destruction. Corrosion-electrochemical descriptions of different areas of 17Mn1Si steel weld, by different electrode was studied and the change of local electrode potentials of surface was appraised during corrosion in NACE solution, and also influence of elastic and plastic deformation. The developed method is used in the research institute (m. Severodoneck) for the evaluation of possibility of local corrosion processes development.