Variable capacitance-based sensor for corrosion monitoring of steel structure surface and manufacturing method thereof

Abstract

The invention discloses a variable capacitance-based sensor for corrosion monitoring of a steel structure surface and a manufacturing method thereof. The variable capacitance-based sensor for corrosion monitoring of a steel structure surface comprises an insulating housing with a top open mouth. The interior of the variable capacitance-based sensor for corrosion monitoring of a steel structure surface is divided into an upper layer, a middle layer and a lower layer. Each one of the upper layer, the middle layer and the lower layer comprises an insulating medium plate and a corroded steel material layer pasting on the insulating medium plate. Lead wires are leaded out from the corroded steel material layers. The lead wires respectively pass through holes of an insulating plate. The manufacturing method comprises the following steps of 1, preparing the insulating medium plates, 2, carrying out a drill process on a drilling zone located in the centre of each one of the insulating medium plates, 3, preparing the corroded steel material layers, 4, leading out the lead wires from the corroded steel material layers, 5, carrying out assembling, 6, plugging all gaps of the variable capacitance-based sensor for corrosion monitoring of a steel structure surface by silicon rubber, and 6, based on an area-alterable capacitance sensor work principle, determining a corrosion loss area according to capacitance change, and determining a corrosion depth according to interlayer resistance change. The variable capacitance-based sensor for corrosion monitoring of a steel structure surface has a simple structure, can be installed conveniently, has high reliability, can realize real-time on-line monitoring of the surface of a steel-structure material, and satisfies requirements of steel structure composition monitoring and assessment.

Description

technical field [0001] The invention relates to the technical field of metal material corrosion detection, in particular to a variable capacitance-based steel structure surface corrosion monitoring sensor and a manufacturing method thereof. Background technique [0002] Steel has excellent mechanical properties, it has high mechanical strength, good plasticity and excellent welding performance. Depending on the proportion of carbon content in the steel, the steel exhibits different hardness and ductility. The alloy steel formed by adding other trace elements to the steel has further improved its mechanical properties. Therefore, steel is widely used in various fields of manufacturing industry and is one of the main materials for structural load-bearing. [0003] Corrosion occurs when steel is exposed to the air for a long time, and the corrosion of steel is a slow electrochemical corrosion process. Steel is in a water environment, and under the action of oxidants in the a...

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Problems solved by technology

Corrosion will form pitting pits on the surface of the steel structure, and even denudation will occur in severe cases, which will reduce the cr

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