Device and method for testing corrosion of grounding material in soil simulated solution

A corrosion test, soil technology, applied in the direction of material inspection products, measuring devices, analyzing materials, etc.

Active Publication Date: 2018-05-08
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The object of the present invention is, aiming at the problems existing in the existing soil corrosion test method, in order to study the imitation and acceleration of the soil simulation solution and the influence of various corrosion factors on the corrosion of the grounding material, the present invention proposes a kind of grounding material in the soil simulation solution Apparatus and method for medium corrosion test

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  • Device and method for testing corrosion of grounding material in soil simulated solution
  • Device and method for testing corrosion of grounding material in soil simulated solution
  • Device and method for testing corrosion of grounding material in soil simulated solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: The composition of the simulated soil solution is unchanged, and the corrosion tests are carried out on three grounding materials respectively, and the corrosion degrees are compared.

[0052] According to the physical and chemical properties of a substation soil and other characteristics, the corresponding soil simulation solution was prepared, and the composition is shown in Table 1.

[0053] Table 1 Components of soil simulation solution

[0054] NaCl

CaCl 2

MgSO 4 ·7H 2 o

NaHCO 3

Na 2 SO 4

KNO 3

pH

0.0502g / L

0.0109g / L

0.0201g / L

0.0139g / L

0.0158g / L

0.0301g / L

4.04

[0055] According to the structure of the test device figure 1 Build the test device platform.

[0056] Prepare Q235 steel working electrode, galvanized steel working electrode and copper clad steel working electrode, the working area is 1cm 2 , Solder wires on the back, and seal the non-working surface with epox...

Embodiment 2

[0065] Example 2: Change the pH of the simulated soil solution, conduct corrosion tests on three grounding materials at different pH values ​​of the simulated soil solution, and compare the corrosion degrees.

[0066] The composition of the simulated soil solution in Example 1 was changed by acetic acid or sodium hydroxide to change the pH of the simulated soil solution, and the rest remained unchanged. The pH values ​​of the simulated soil solutions were 5, 6, 7, 8, and 9, respectively. The corrosion test was carried out respectively according to the conditions of Example 1. After the corrosion test was finished, the corrosion current density obtained by fitting the polarization curve was shown in Table 3. It can be seen from Table 3 that as the pH value increases, the corrosion current density decreases. Corrosion rate drops. Under this condition, the oxygen absorption corrosion rate of the three grounding materials is less than the hydrogen evolution corrosion rate.

[00...

Embodiment 3

[0070] Example 3: Change the content of the soil simulation solution, and conduct corrosion tests on the three grounding materials under different oxygen content of the soil simulation solution, and compare the corrosion degrees.

[0071] The oxygen content of the simulated soil solution of Example 1 was changed to 30 mg / L, 40 mg / L and 50 mg / L (±1 mg / L) respectively.

[0072] Other conditions are constant, repeat the test of embodiment 1.

[0073] After the corrosion test, the corrosion current density obtained by fitting the polarization curve is shown in Table 4. It can be seen from Table 4 that with the increase of oxygen content, the corrosion current density of the three grounding materials increases, and the corrosion rate increases. Large, indicating that under this condition, the oxygen content increases, the electrochemical reaction rate of the three materials is increased, and the corrosion rate is increased.

[0074] Table 4 Corrosion current density parameters fit...

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Abstract

The invention discloses a device and a method for testing the corrosion of a grounding material in a soil simulated solution. The device comprises a soil simulated solution tank (1), a temperature control system, a gas control system, a three-electrode system and a liquid transmission system, wherein the temperature control system comprises a heating-temperature control integral machine (9) and atemperature sensing module (8); the gas control system comprises a gas switch (10), a gas guide tube (11), an intelligent gas sensor (12), an oxygen content analysis module (6), a gas switch valve (13) and an oxygen bottle (14); the liquid transmission system comprises an intelligent water pump (7), a soil simulated solution control valve (15), a liquid diverter (16), an intelligent control valve,a combiner box (26) and a liquid control switch (27); the three-electrode system comprises three three-electrode testing areas; each three-electrode testing area comprises a three-electrode intelligent rotating module (28), a grounding material working electrode (29), a reference electrode (30), an auxiliary electrode (31) and an intelligent rotating module motor (32).

Description

technical field [0001] The invention relates to a corrosion test device and method of a grounding material in a soil simulation solution, belonging to the technical field of grounding. Background technique [0002] The corrosion of metal materials in soil is one of the serious corrosion problems of metals. As one of many links to ensure the safe and stable operation of power grid equipment, the reliability of the grounding grid is directly related to the safe operation of the power grid. The study of metal corrosion is of great significance. The soil corrosion test methods mainly include the field embedded test piece method and the laboratory simulation accelerated method. [0003] The field embedded test piece method is the most classic soil corrosion research method, which can reliably obtain corrosion data such as corrosion rate, corrosion type and corrosion mechanism of different materials in different soil environments. M.Romanoff et al. conducted relevant tests, and ...

Claims

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Application Information

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IPC IPC(8): G01N17/00
CPCG01N17/00G01N17/02G01N33/24
Inventor 刘欣李志美裴锋田旭毛荣军贾蕗路李财芳何弦郑湘娟皮婷张晓钟晓丽卓德煌
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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