METHOD AND DEVICE FOR CONTINUOUS CONTROL OF PITTING CORROSION OF METAL STRUCTURES INNER WALLS Russian patent published in 2019 - IPC G01N17/02 

FIELD: physics.

SUBSTANCE: invention relates to control over corrosion processes and can be used for continuous control of pitting corrosion and its penetration into inner walls of metal structures (evaporators, reactors, heat exchangers, tanks, pipelines, and so forth) in contact with electroconductive corrosive media under conditions when it is impossible to avoid development of pitting corrosion. Method of continuous control of pitting corrosion of inner walls of metal structures in corrosive medium includes placement in it of an indicator electrode made of material of internal wall of equipment, which is additionally introduced into corrosive medium of auxiliary electrode is anodically polarized in galvanostatic mode until formation of stable pitting on surface of electrode, thereafter, the indicator electrode is synchronously disconnected from the direct-current source and connected through a current-measuring device to the wall, wherein continuous control of pitting corrosion is performed based on the current value in the "wall-indicator electrode" circuit. Device for continuous control of pitting corrosion of inner walls of metal structures comprises indicator electrodes having thicknesses that are smaller and different from each other than the wall of the metal structure, and made from the same material as the metal structure, wherein the inner side of each indicator electrode through the electrically insulating moisture-absorbing spacer is mechanically connected to the control electrode of the same dimensions as the indicator electrode, and made of metal or having coating with more negative potential of corrosion in given medium than metal of additionally installed auxiliary electrode, wherein each indicator electrode, electrically insulating moisture-absorbing spacer and control electrode form sensors located in common housing from corrosion-resistant dielectric material, wherein each indicator electrode by means of the synchronous switches and the current meter unit is electrically connected to the metal structure and positive pole of the external DC source, and each control electrode through the synchronous switches unit and the voltmeter is electrically connected to the auxiliary electrode, which has a connector for connection to the negative pole of the DC source.

EFFECT: technical result is multifunctionality, which enables to continuously determine kinetics of development of corrosion process and degree of its danger, timely take measures to remove structure from operation, thus avoiding emergency leaks of corrosive media, to establish practical service life of metal structures at constant remote diagnostics of their corrosion state.

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