Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and device for detecting corrosion of component with permeability magnetic material protective layer

A corrosion detection and protective layer technology, applied in the field of non-destructive testing based on pulsed eddy current, can solve the problem of low sensitivity and achieve the effect of increasing penetration depth, improving detection sensitivity and reducing magnetic permeability

Inactive Publication Date: 2009-09-02
HUAZHONG UNIV OF SCI & TECH
View PDF4 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for detecting corrosion of components with a protective layer of magnetically permeable material, which overcomes the existing pulsed eddy current technology in detecting ferromagnetic components with a protective layer of magnetically permeable material Disadvantages of low sensitivity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for detecting corrosion of component with permeability magnetic material protective layer
  • Method and device for detecting corrosion of component with permeability magnetic material protective layer
  • Method and device for detecting corrosion of component with permeability magnetic material protective layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] The principle schematic diagram of detection method of the present invention is as figure 1 As shown, the component under test 1 is covered with a cladding layer 2 with a thickness H, and the cladding layer 2 is covered with a magnetically permeable protective layer 3 with a thickness h. The upper end of the permanent magnet 4 is adsorbed on the left and right ends of the yoke 7, and the polarities of the magnets at both ends are perpendicular to the measured member 1 and opposite, and the lower end of the permanent magnet 4 is adsorbed (or lifted away from a certain distance) on the magnetic conductive protective layer 3, and the permanent magnet 4 , The magnetic yoke 7 and the magnetically conductive protective layer 3 form a closed magnetic path, which magnetizes the magnetically conductive protective layer 3 to deep saturation or deep saturation, reduces the magnetic permeability of the magnetically conductive protective layer material, and improves the penetration d...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for detecting the corrosion of a component with a permeability magnetic material protective layer. The method comprises the following steps: the permeability magnetic material protective layer is magnetized to be saturated or deeply saturated, a reference area and a area to be detected are selected on the surface of a detected component, pulsed eddy current sensors are arranged on the protective layers of the two areas, the square-wave exciting is applied to exciting coils of the pulsed eddy current sensors, the attenuation curve of the induced voltage in the detecting coils of pulsed eddy current sensors is measured after the level of square waves is reduced to the low level, and the difference between the attenuation curves of the induced voltage in the two areas is compared, thus the corrosion condition of the area to be detected relative to the reference area can be further distinguished. The invention also provides a device for realizing the method, which comprises a pulsed eddy current sensor, a square-wave signal exciting circuit, a signal processing circuit, an A / D conversion circuit and a computer which are connected in sequence, wherein the pulsed eddy current sensor is provided with a magnetization unit. The invention improves the sensitivity of corrosion detection of the component with the permeability magnetic material protective layer and is suitable for detecting the corrosion of the component on-line without dismounting the protective layer and the cladding layer.

Description

technical field [0001] The invention relates to the field of non-destructive testing, in particular to a non-destructive testing method and device based on pulsed eddy current, and is especially suitable for non-stop testing of components with a protective layer of magnetic-permeable material without dismantling the protective layer and cladding layer. Background technique [0002] Ferromagnetic components with a protective layer of magnetic conductive materials, such as steam pipes and pressure vessels, are widely used in oil and gas, chemical industry, water supply and heating and other industries. The insulating material is coated on the outside of the component, and the outside of the coating is usually protected by a metal The protective layer is used to prevent rain, and the commonly used protective layer materials are aluminum, stainless steel or tinplate. At present, the corrosion detection of ferromagnetic components with cladding layers is usually carried out by re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N27/90G01N27/904
Inventor 武新军徐志远黄琛丁旭康宜华徐江
Owner HUAZHONG UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com