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Testing method for simulating corrosion process of carbon steel in atmospheric environment with different ultraviolet radiation intensities

A technology of atmospheric environment and test method, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problems of insufficient rigor and achieve the effect of increasing authenticity

Inactive Publication Date: 2018-10-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is due to the fact that sunlight contains ultraviolet and infrared spectra at the same time, and the existence of infrared spectrum will cause temperature changes, which makes the study of the influence of ultraviolet radiation on the corrosion behavior of materials at room temperature not rigorous enough.

Method used

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  • Testing method for simulating corrosion process of carbon steel in atmospheric environment with different ultraviolet radiation intensities
  • Testing method for simulating corrosion process of carbon steel in atmospheric environment with different ultraviolet radiation intensities
  • Testing method for simulating corrosion process of carbon steel in atmospheric environment with different ultraviolet radiation intensities

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Experimental program
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Embodiment 1

[0019] The influence of different ultraviolet radiation doses on the corrosion behavior of carbon steel in simulated South China Sea atmospheric environment. The test material is carbon steel, and its composition is shown in Table 1.

[0020] Table 1 Chemical composition of carbon steel

[0021]

[0022] The test conditions are as follows: the seawater retrieved from the South China Sea (see Table 2 for composition) was pre-deposited on the surface of the sample, and after drying, it was cycled every 6 hours according to the sequence of "condensation 2h (wetting)→irradiation 4h (drying)". Deposit the corrosive solution once in 4 cycles to supplement the amount of corrosive medium on the surface of the carbon steel. Cycle process:

[0023] 1) The condensation stage is 40°C, 2h; the irradiation stage is 60°C, 0.35W / m 2 , 4h.

[0024] 2) The condensation stage is 40°C, 2h; the irradiation stage is 60°C, 0.68W / m 2 , 4h.

[0025] The sampling periods are 48, 96, 144, 196 a...

Embodiment 2

[0034] Simulate the effect of different UV radiation doses on the corrosion behavior of carbon steel in different corrosive media. The test conditions are as follows: 33g / L NaCl solution and 33g / L NaCl+3.2g / L NaCl respectively 2 SO 4 The mixed solution (hereinafter referred to as C and CS respectively, the solution concentration keeps the Cl in the solution - and SO 4 2- Concentrations are consistent with seawater) pre-deposited on the surface of the sample, after drying, cycle every 6 hours in the order of "condensation 2h (wetting)→irradiation 4h (drying)", deposit corrosion solution every 4 cycles, and replenish carbon The amount of corrosive medium on the steel surface. The cycle process is carried out in the following three ways:

[0035] 1) UV1: condensation stage is 40°C, 2h; irradiation stage is 60°C, 0W / m 2 , 4h.

[0036] 2) UV2: condensation stage is 40°C, 2h; irradiation stage is 60°C, 0.35W / m 2 , 4h.

[0037] 3) UV3: condensation stage is 40°C, 2h; irradia...

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Abstract

The invention discloses a testing method for simulating a corrosion process of carbon steel in an atmospheric environment with different ultraviolet radiation intensities, and belongs to the technicalfield of atmosphere corrosion simulation. The testing method comprises the following steps: taking carbon steel as a testing material, depositing a corrosion liquid on the surface of a test sample inadvance, drying, repeating procedures of 'condensation for two hours and radiation for 4 hours' once every six hours, and setting testing temperatures, namely 40-60 DEG C in the condensation procedure and 45-80 DEG C in the radiation procedure. By adjusting the ultraviolet radiation intensities of the radiation procedure, the influence of high, medium and low ultraviolet radiation intensities upon the corrosion process of the carbon steel is simulated. The temperature of the radiation procedure is controlled to be higher than the room temperature, and thus an actual temperature on the surfaceof the sample is ensured. The testing method has simulation, acceleration quality and reproducibility, and can be used for studying corrosion behaviors of different types of carbon steel in atmospheric environments with different ultraviolet radiation intensities, the service life of a material can be also evaluated and predicted, and a basis can be made for reasonably selecting materials and appropriate protection methods.

Description

technical field [0001] The invention relates to the technical field of atmospheric corrosion simulation, in particular to a test method for simulating the corrosion process of carbon steel in atmospheric environments with different amounts of ultraviolet radiation. Background technique [0002] As the most commonly used structural material, carbon steel is widely used in the fields of building materials, transportation, resources and the environment. In most cases, carbon steel is inevitably in direct contact with the atmosphere in the service environment, and atmospheric corrosion occurs. Since the corrosion process is a reaction between the environment and the system constructed by the material, when the environment changes, the corrosion behavior of the same material will become very different. [0003] The influencing factors of atmospheric corrosion mainly include relative humidity, temperature, polluting gas, and sunlight radiation, among which the relevant research o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
CPCG01N17/004G01N17/006
Inventor 刘雨薇王振尧曹公望张健
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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