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Accelerating corrosion test method for simulating air corrosion process

An accelerated corrosion test, atmospheric corrosion technology, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problems of difficult operation, many control factors, etc., and achieve the effect of a wide range of applications

Inactive Publication Date: 2006-01-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Japan uses a CASS testing machine to convert it into a composite testing machine, which can perform wet, spray, and SO2 tests. 2 , dry cycle test; the Q-FOG cycle corrosion test machine manufactured by Q-RANEL in the United States can carry out cycle tests such as salt dew, drying, and regular pauses. The disadvantage of this method is that there are many factors that need to be controlled and the operation is difficult. bigger

Method used

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  • Accelerating corrosion test method for simulating air corrosion process
  • Accelerating corrosion test method for simulating air corrosion process
  • Accelerating corrosion test method for simulating air corrosion process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The test materials are the above-mentioned A3, 09CuPTiRe, 10CrNiCuP. With 0.01mol / L NaHSO 3 +0.005mol / L NaCl is the impregnation solution, which is circulated every 30 minutes according to the sequence of "immersion→drying→wetting→", in which immersion at 40°C for 4 minutes; drying at 50°C for 22 minutes; wetness at 40°C for 4 minutes. This is used to simulate the atmospheric corrosion process in industrial cities in Shenyang, and the relationship between corrosion weight loss and test time is shown in figure 2 , the regression analysis of corrosion weight loss and accelerated test time is shown in Table 3. Corrosion laws are also well in line with ΔW=kt n law, where ΔW is corrosion weight loss (g / m 2), t is the test time (hours), k and n are constants related to the test conditions and materials; the main corrosion products are consistent with those exposed to the outdoor atmosphere.

[0035] Material

Embodiment 2

[0037] The test materials are A3, 20, and 06CuP, and the chemical compositions of the latter two materials are shown in Table 4. With 0.01mol / LNaHSO 3 +0.001mol / L NaCl is the impregnation solution, which is circulated every 20 minutes according to the sequence of "immersion→drying→wetting→", among which immersion at 40°C for 4 minutes; drying at 50°C for 12 minutes; wetness at 40°C for 4 minutes. This is used to simulate the atmospheric corrosion process in industrial cities in Shenyang, and the relationship between corrosion weight loss and test time is shown in image 3 , the regression analysis of corrosion weight loss and accelerated test time is shown in Table 5. Corrosion laws are also well in line with ΔW=kt n Regularity; the main corrosion products are consistent with the main corrosion products exposed to the outdoor atmosphere.

[0038] Material

[0039] Material

Embodiment 3

[0041] The test materials are the above-mentioned A3 and 10CrNiCuP. With 0.05mol / L NaHSO 3 +0.005mol / LNaCl is the impregnating solution, which is circulated every 10 minutes in the order of "impregnating→drying→wetting→", in which immersing at 50°C for 1 minute; drying at 60°C for 8 minutes; wetting at 50°C for 1 minute. This is used to simulate the atmospheric corrosion process in industrial cities in Shenyang, and the relationship between corrosion weight loss and test time is shown in Figure 4 , the regression analysis of corrosion weight loss and accelerated test time is shown in Table 6. Corrosion laws are also well in line with ΔW=kt n Regularity; the main corrosion products are consistent with the main corrosion products exposed to the outdoor atmosphere.

[0042] Material

regression equation

correlation coefficient

A3

ΔW=7.07t 0.8944

0.991

10CrNiCuP

ΔW=4.71t 0.8704

0.962

[0043] The embodiment is re...

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Abstract

The present invention relates to atmosphere corrosion simulating technology, and is especially one corrosion speeding test method via simulating atmosphere corrosion. The dipping solution including NaHSO3 of 0.01-0.05 mol / L concentration and NaCl in 0.001-0.005 mol / L concentration is used in the dipping-drying-moistening circulation of 10-30 min each, with the dipping being at 40-50 deg.c for 1-4 min, the drying at 50-60 deg.c for 8-22 min and the moistening at 40-50 deg.c for 1-4 min. The method has fast speed and high repeatability in simulating the atmosphere corrosion in industrial city, and may be used in research of atmosphere corrosion regularity of steel in said environment as well as the research of atmosphere corrosion of steel and corrosion resistance evaluation of various kinds of steel material.

Description

technical field [0001] The invention relates to a simulation technology of atmospheric corrosion, in particular to an accelerated corrosion test method for simulating the atmospheric corrosion process. Background technique [0002] The exposure test in natural environment is the most commonly used test method for studying atmospheric corrosion. It can truly reflect the corrosion status of the location, and calculate the corrosion rate of the material in this environment, which can provide a reasonable and reliable design basis for engineering anti-corrosion design. . However, due to the long period of the atmospheric exposure test and the strong regionality of the test, people are prompted to carry out simulated accelerated corrosion test research, in order to speculate the results of the outdoor long-term exposure test from the laboratory accelerated corrosion test, and then predict the atmospheric corrosion of materials, products, and protective layers. Corrosion life, to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00G01N17/02
Inventor 王振尧于国才韩薇
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI