Submarine cable armoring wire crevice corrosion test device and evaluation method

Abstract

The invention discloses a submarine cable armoring wire crevice corrosion test device and an evaluation method. At present, a device and method capable of reasonably reflecting the crevice corrosion risk of the metal armoring wires of submarine cables and providing quantitative evaluation are urgently needed. The device of the invention comprises a seawater medium experiment box and a crevice corrosion clamp; the crevice corrosion clamp is arranged in the seawater medium experiment box; the seawater medium experiment box is used as a container for containing a solution to simulate a seawater corrosion environment; the crevice corrosion clamp is used as a main body for wire crevice corrosion simulation and is used for clamping wires and adjusting an artificial crevice between two wires; thecrevice corrosion clamp is a supporting seat shaped like a Chinese character ''ao''; and two supporting limiting holes are formed in vertical plates at two sides of the crevice corrosion clamp on a coaxial straight line respectively. According to the device of the invention, the crevice corrosion clamp can be adjusted, so that the size of the crevice can be adjusted; tensile stress is applied toa sample; and therefore, the working condition of the armoring wires can be simulated.

Description

technical field [0001] The invention belongs to the field of crevice corrosion testing of metal materials, and relates to an experimental testing device and evaluation method for crevice corrosion of submarine cable armored wire. Background technique [0002] With the construction of the global energy Internet, submarine cables are developing towards higher voltage levels, longer running lengths and higher transmission capacity. Submarine cables are mainly used for long-distance power supply across bays, between land and islands, between islands and islands, between offshore platforms and land or islands, between submarine production facilities and platforms or onshore terminals, sea-based power generation facilities and onshore terminals, etc. , due to the long laying distance of the submarine cable, the complex and harsh environment of the ocean and seabed, the safety requirements of the cable body are relatively high, and the outer layer is generally supported and protect...

AI Technical Summary

Problems solved by technology

The armored wire bears tensile and torsional loads in the axial direction, and is squeezed in the lateral direction. Its structural characteristics allow seawater medium to penetrate the armor layer, and the submarine cables laid on the seabed produce certain lateral swings under the action of ocean currents and may Local wear occurs, both further aggravating the corrosion of the armor wire

[0004] Although crevice corrosion of metallic materials is a well-understood corrosion type, there is still a lack of targeted crevice corrosion evaluation tools or methods for the special structure of the submarine cable armor layer, as well as the load state and seawater environment caused by the operating conditions of the submarine cable.

Traditional crevice corrosion experimental methods and devices are difficult to simulate such special working conditions, and it is difficult to scientifically reflect the crevice corrosion law and corrosion electrochemical parameters of submarine cable armored wire

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