Experiment device for research on corrosion behavior of metal substrate beneath peeling coating

Abstract

The invention discloses an experiment device for research on the corrosion behavior of a metal substrate beneath a peeling coating. The experiment device comprises an epoxy resin plate, an organic glass plate, a plurality of work electrode, at least one auxiliary anode, a plurality of reference electrodes, a plurality of needle tubes, a plurality of lead wires, a plurality of bolts, a steel pipe, gaskets, a voltmeter, a constant potential rectifier, an electrochemical tester, and a stray current source. In the provided equipment, the organic glass plate and epoxy resin plate are used to simulate the medium environment beneath a peeling coating, wherein a gap exists between the organic glass plate and the epoxy resin plate, and the gap thickness can be controlled by adjusting the number of gaskets; multiple work electrodes are arranged on the damaged parts and different positions beneath the peeling coating to simulate the metal substrates on the damage parts and positions beneath the peeling coating. Only one experiment device can carry out many indoor experiments on the corrosion behavior of metal substrate under factors of stray currents, gap thickness, and cathode protection potential, and the like.

Description

technical field [0001] The invention belongs to the field of pipeline corrosion and protection detection, and is particularly suitable for an experimental device for studying the corrosion behavior of a metal substrate under a stripped coating. Background technique [0002] In recent years, with the development of my country's petroleum and energy industries, a large number of metal pipelines for oil and natural gas have been buried underground, including long-distance pipelines of more than 20,000 kilometers, and urban pipeline networks are countless. Since the current pavement methods of these pipelines are mostly buried, they will inevitably be damaged by mechanical force and stress during installation and use, resulting in pinholes, blisters, and warping on the outer anti-corrosion coating. As a result, a peeling zone is formed between the damaged coating and the substrate, so that the electrolyte in the soil solution can go deep into the peeling zone during subsequent...

AI Technical Summary

Problems solved by technology

At present, in Europe and the United States, flat-plate test devices and ring-shaped test devices have been established respectively to conduct experimental research on the axial and circumferential corrosion characteristic

Images