Accelerated corrosion testing method for simulating soil corrosion process

A test method and soil corrosion technology, which is applied in the fields of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve problems such as limited acceleration ratio and difficult soil uniformity, and achieves wide application range, simulation, and significant Accelerates the corrosive effect

Active Publication Date: 2013-09-18
CENT IRON & STEEL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its disadvantage is that it needs to take soil on the spot, it is difficult to ensure the uniformity of the soil, and the speedup ratio is limited.
[0020] The above-mentioned various test methods have a positive effect on judging the soil corrosion resistance of materials to a certain extent, but they all have their own limitations.

Method used

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  • Accelerated corrosion testing method for simulating soil corrosion process
  • Accelerated corrosion testing method for simulating soil corrosion process
  • Accelerated corrosion testing method for simulating soil corrosion process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The test material is the above-mentioned Q235 steel. According to the physical and chemical properties of the target soil, 5Kg of test soil with a water content of 40%, a pH value of 4.5-4.7, and a total salt content of 3 times the target soil was prepared.

[0060] (1) The preparation content of each drug (ie, salt) is shown in Table 3. These drugs were dissolved in 2L of deionized water and stirred evenly.

[0061] Table 3 Test drug weighing amount

[0062]

[0063] with CaCl 2 For example, the calculation method of the test amount is:

[0064] m (CaCl 2 )=0.0111×5×60%×3=0.0999g.

[0065] Among them, the content of each chemical is the amount of the drug measured when the soil is dried and ground and mixed with 50% deionized water. In the calculation formula, 5×60%=3Kg means that the soil carrying salt in the test is 3Kg (correspondingly, 3 water is used for 1:1 leaching, so that the salt concentration remains unchanged); multiplied by 3 means the magnification...

Embodiment 2

[0072] The test material is the above-mentioned Q235 steel. According to the physical and chemical properties of the target soil, 5Kg of simulated soil with a water content of 40%, a pH value of 4.5-4.7, and a total salt content of 3 times the target soil was prepared.

[0073] (1) The preparation content of each drug is shown in Table 4. These drugs were dissolved in 2L of deionized water and stirred evenly.

[0074] Table 4 Test drug weighing amount

[0075]

[0076] (2) Adjust the pH value of the solution in (1) to 1.24-1.26 with 98% concentrated sulfuric acid.

[0077] (3) Weigh 200 mesh diatomite 1.2Kg, its bulk density is 0.42g / cm 3 , the 150 mesh sieve is less than 14%; weigh 1.8Kg of 20-40 mesh diatomite, and its bulk density is 0.37g / cm 3 , 150 mesh sieve is less than 6%; the solution is evenly mixed with two kinds of diatomaceous earth, and the test soil is prepared.

[0078] (4) Bury the long side of the Q235 sample vertically downwards into the test box, and ...

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Abstract

The invention discloses an accelerated corrosion testing method for simulating a soil corrosion process. The method comprises the following steps of: (1) preparing a testing solution from salt and water according to components of target soil; (2) adjusting the pH (Potential of Hydrogen) value of the testing solution to a testing value by H2SO4 or NaOH, thus taking the testing solution as an impregnation medium for simulating soil corrosion, wherein the testing value is the same as the pH value of the target soil; (3) mixing diatomite, which is taken as a carrier, with an impregnation medium to prepare testing soil which is basically same as the target soil in physicochemical properties; and (4) testing a test sample in the testing soil according a pre-set testing temperature, relative humidity and testing period.

Description

technical field [0001] The invention relates to an accelerated corrosion test method for simulating a soil corrosion process, more specifically, the present invention relates to an accelerated corrosion test method for simulating a soil corrosion process with excellent simulation, acceleration and reproducibility. Background technique [0002] The material corrosion problem in the soil environment is not only an important topic in the field of corrosion science research, but also a practical problem that needs to be solved urgently in the application of underground engineering. [0003] The selection of materials in infrastructure construction should be based on the corrosion and aging data of materials (products) in the typical environment of the use area as an important basis. Therefore, the research on soil corrosion test methods for metal materials, especially the research on new test methods that are simple, fast, effective, and standardized, can provide material soil c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
Inventor 苏航闫爱军陈小平柴锋李健黄涛
Owner CENT IRON & STEEL RES INST
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