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Couple electrochemical noise corrosion monitoring probe

An electrochemical noise and corrosion monitoring technology, applied in the field of electrochemistry, can solve problems such as electrode short circuit and probe failure, and achieve the effect of prolonging life and improving sensitivity

Active Publication Date: 2012-10-10
HUAZHONG UNIV OF SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

Such a design can sensitively detect the corrosion current of metals under an extremely thin liquid film, but in some corrosive environments (such as containing H 2 S gas) will short-circuit the electrode due to the generation of conductive corrosion products (such as FeS) on the electrode surface, and the probe will fail quickly

Method used

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  • Couple electrochemical noise corrosion monitoring probe
  • Couple electrochemical noise corrosion monitoring probe
  • Couple electrochemical noise corrosion monitoring probe

Examples

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Embodiment 1

[0021] figure 1 Schematic diagram of the connection between the corrosion monitoring probe (1) for galvanic electrochemical noise and the CST500 galvanic electrochemical noise corrosion monitor (2); the planar multi-electrode galvanic electrochemical noise test assembly (3) and the control switch (4 ) to form a corrosion monitoring probe (1).

[0022] The probe wall (12) is made of 316L stainless steel with an outer diameter of 18 mm, the electrode piece is made of X52 carbon steel, and polysiloxane resin is filled between the electrode piece and the probe wall. a In the electrode group, the electrode sheets a1, a2, a3 and a4 are stacked at equal intervals, each electrode sheet is 3.0 mm long, 0.5 mm wide, and the distance between adjacent electrode sheets is 0.1 mm. The electrode sheet a5 is 2.3mm long and 0.5mm wide, and it is placed vertically with a1, a2, a3 and a4 with a distance of 0.1mm. The size and placement of the electrode sheets in the b and c electrode groups ar...

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Abstract

The invention provides a couple electrochemical noise corrosion monitoring probe, which comprises a planar multi-electrode couple electrochemical noise testing component for generating a couple electrochemical noise potential and a current signal and a control switch for controlling a short-circuit mode of each electrode sheet. The monitoring probe is a probe for monitoring local corrosion of a metal material in a multi-phase corrosive environment, particularly a corrosive gas-phase environment by using couple electrochemical noise, can be used for monitoring solution phase and gas phase corrosion and has high sensitivity; moreover, local corrosion information of metal corrosion can be provided by using a couple electrochemical noise signal. The monitoring probe is provided with the control switch, the short-circuit mode of each electrode sheet can be changed according to the change of a monitoring signal, and a small-interval electrode group on the probe is switched into a large-interval electrode group, so that initial high sensitivity during monitoring is ensured and the service life of the probe in the corrosive environment can be prolonged.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and relates to a galvanic couple electrochemical noise corrosion monitoring probe, in particular to a probe for monitoring localized corrosion of metal materials in a multiphase corrosion environment, especially a corrosive gas phase environment, by using galvanic couple electrochemical noise. Background technique [0002] In the current electrochemical noise corrosion monitoring technology, the probes are mostly finger-shaped three-electrode or multi-electrode probes. The patent invented by D.A.Eden in 1992 is a typical finger-shaped three-electrode probe. Such probes can have good sensitivity for monitoring the corrosion of metals in the solution phase, but are not sensitive for monitoring the corrosion of metals in corrosive gas phase environments. Vapor phase corrosion, especially the most common atmospheric corrosion is characterized by electrochemical corrosion that occurs under the liquid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/02
Inventor 郭兴蓬胡骞董泽华陈振宇
Owner HUAZHONG UNIV OF SCI & TECH
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