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Metal crevice corrosion simulation device and metal crevice corrosion simulation experiment method

A technology for crevice corrosion and simulating devices, which is used in measurement devices, weather resistance/light resistance/corrosion resistance, instruments, etc., and can solve problems such as weak guidance in actual corrosion conditions.

Pending Publication Date: 2020-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the crevice corrosion test methods are limited to laboratory corrosion evaluation after prefabricated cracks on metal test pieces, and some evaluation methods use on-site hanging corrosion test pieces.
However, the crevice corrosion test is carried out in the form of a test piece. The surface state, stress state, and even the environmental factors of the test piece are different from the actual production on site, and the guidance for the actual corrosion situation is weak.

Method used

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  • Metal crevice corrosion simulation device and metal crevice corrosion simulation experiment method
  • Metal crevice corrosion simulation device and metal crevice corrosion simulation experiment method
  • Metal crevice corrosion simulation device and metal crevice corrosion simulation experiment method

Examples

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Embodiment 1

[0066] This embodiment provides a simulation device for metal crevice corrosion, referring to figure 1 and figure 2 As shown, it includes a bottom support plate 1 , a top cover plate 2 , a pressurized backing plate 3 , a support screw 4 and a prefabricated gap gasket 6 . An experimental pipe 7 is sandwiched between a pair of prefabricated gap gaskets 6 arranged up and down. The prefabricated gap gaskets 6 arranged up and down are fixed by the top cover plate 2 above and the bottom support plate 1 below. In this embodiment, the top cover plate 2 is in contact with the pressure pad 3 .

[0067] Refer to the shape of the top cover 2 Figure 4 As shown, the shape of the bottom support plate 1 refers to image 3 shown. In this embodiment, three installation holes are provided on the bottom support plate 1, refer to image 3 As shown, the two mounting holes on the left are used to install the support screw 4, and the support screw 4 supports the bottom support plate 1 and the...

Embodiment 2

[0093] This embodiment provides a simulation device for metal crevice corrosion in a symmetrical arrangement, referring to Figure 7 As shown, the only difference from Embodiment 1 is that in this embodiment, pressure pads 3 and support screws 4 are arranged symmetrically on both sides of the top cover plate 2, and the number of support screws 4 is four (two pairs). , each pair of adjacent supporting screw rods 4 is used to support the pressurized backing plate 3 and the bottom supporting plate 1 . The pressure pads 3 arranged on both sides of the top cover 2 apply downward pressure to compress the top cover 2 and the prefabricated gap gasket 6 to ensure that the experimental pipe 7 does not move sideways.

[0094] All the other structures are the same as in Example 1, and the method of use is also the same as in Example 1.

Embodiment 3

[0096] This embodiment provides a simulation device for asymmetrically arranged metal crevice corrosion, refer to Figure 8 As shown, it includes a bottom support plate 1 , a top cover plate 2 , a pressurized backing plate 3 , a support screw 4 , a first rotating shaft 8 , a second rotating shaft 9 , a T-shaped plate 10 and a prefabricated gap gasket 6 .

[0097] One end of the bottom supporting plate 1 is pierced with a first rotating shaft 8, the first rotating shaft 8 runs through the bottom supporting plate 1 transversely, and both ends of the first rotating shaft 8 are connected in series with rollers, and each roller is provided with a The support hole of the support screw 4 is installed, the top of the support screw 4 is fixedly connected with the pressure backing plate 3, the bottom end of the support screw 4 is fixedly connected with the support hole of the roller, and the support screw 4 can rotate around the first rotation axis 8, and the top One end of the cover pl...

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Abstract

The invention provides a metal crevice corrosion simulation device and a metal crevice corrosion simulation experiment method, and relates to the technical field of material corrosion evaluation devices. The metal crevice corrosion simulation device provided by the invention can be used for evaluating the crevice corrosion degree of a to-be-tested metal object in the field environment, and the metal crevice corrosion simulation device provided by the invention is not regarded as an acceleration test method in the service environment, which has important guiding significance for the actual corrosion condition of the actual metal object. According to the metal crevice corrosion simulation device provided by the invention, the to-be-tested metal object cannot be damaged in the crevice corrosion evaluation process, the to-be-tested metal object (pipe fitting) does not need to be processed into an experimental test piece, the surface state of the pipe fitting conforms to the actual workingcondition, a pipeline cannot be seriously damaged, and the processing cost is favorably saved.

Description

technical field [0001] The invention relates to the technical field of material corrosion evaluation devices, in particular to a metal crevice corrosion simulation device and a metal crevice corrosion simulation experiment method. Background technique [0002] Crevice corrosion of metallic materials is a corrosion phenomenon that occurs in narrow crevices. Narrow gaps limit the mass transfer between the ambient medium and the metal crevice surface. In such a stagnant zone, local environmental changes can lead to the formation of acidic / high chloride conditions, resulting in the initiation and expansion of sensitive metal crevice corrosion. In industrial production practice, cracks can usually be divided into two categories: (1) natural cracks, that is, cracks caused by biological fouling, sediment, debris, sediment, etc.; gaps in the process. [0003] At present, most of the crevice corrosion test methods are limited to laboratory corrosion evaluation after prefabricated c...

Claims

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Application Information

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IPC IPC(8): G01N3/56G01N3/04G01N17/00
CPCG01N3/56G01N3/567G01N3/04G01N17/006G01N2203/024G01N2203/0064G01N2203/0066G01N2203/0423
Inventor 张宏飞段永锋王维宗李朝法王宁包振宇李晓炜
Owner CHINA PETROLEUM & CHEM CORP
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