Test method for simulating corrosion process of stainless steel in industrial marine atmosphere

A marine atmosphere and corrosion process technology, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problem of less stainless steel materials

Pending Publication Date: 2019-01-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many indoor accelerated corrosion tests on aluminum alloy, carbon steel and weathering steel to simulate the industrial marine atmospheric environment, but there are very few researches on the indoor accelerated corrosion test of stainless steel materials in the industrial marine atmospheric environment.

Method used

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  • Test method for simulating corrosion process of stainless steel in industrial marine atmosphere
  • Test method for simulating corrosion process of stainless steel in industrial marine atmosphere
  • Test method for simulating corrosion process of stainless steel in industrial marine atmosphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The experimental material is 316L stainless steel, and the ultraviolet irradiation test is carried out on the sample first, and the irradiation intensity is 60W / m 2 , the temperature is 50°C, and the test time is 50 hours. Then with the mass fraction of 5% NaCl+0.1% Na 2 S 2 o 8 The mixed solution is used as the impregnating solution, and the dry-wet test is carried out on the sample in the order of "immersion→drying" in the periodical immersion testing machine, and the cycle is repeated every 30 minutes. The temperature is 40°C, the relative humidity in the testing machine used is 90% RH, and the test time is 50 hours. figure 1 (a) is the surface morphology of the sample after the test. It can be seen that there are obvious pitting pits on the surface of the sample, which is a typical atmospheric corrosion morphology of stainless steel. Figure 4 (a) is the surface topography of the sample after 12 months of outdoor exposure. The comparison shows that the pitting p...

Embodiment 2

[0046] The experimental material is 316L stainless steel, and the ultraviolet irradiation test is carried out on the sample first, and the irradiation intensity is 60W / m 2 , the temperature is 50°C, and the test time is 50 hours. Then with the mass fraction of 1% NaCl+0.3% Na 2 S 2 o 8 The mixed solution is used as the impregnating solution, and the dry-wet test is carried out on the sample in the order of "immersion→drying" in the periodical immersion testing machine, and the cycle is repeated every 30 minutes. The temperature is 40°C, the relative humidity in the testing machine used is 90% RH, and the test time is 50 hours. The above-mentioned "ultraviolet radiation test + alternating wet and dry test" was carried out for 2 cycles, and the cumulative test time was 200 hours. figure 1 (b) is the topography of the sample surface after the test. It can be seen that there are obvious pitting pits on the surface of the sample, which is a typical atmospheric corrosion morphol...

Embodiment 3

[0048] The experimental material is 316L stainless steel, and the ultraviolet irradiation test is carried out on the sample first, and the irradiation intensity is 60W / m 2 , the temperature is 50°C, and the test time is 50 hours. Then with the mass fraction of 3% NaCl+0.25% Na 2 S 2 o 8 The mixed solution is used as the impregnating solution, and the dry-wet test is carried out on the sample in the order of "immersion→drying" in the periodical immersion testing machine, and the cycle is repeated every 30 minutes. The temperature is 40°C, the relative humidity in the testing machine used is 90% RH, and the test time is 50 hours. The above-mentioned "ultraviolet radiation test + alternating wet and dry test" was carried out for 4 cycles, and the cumulative test time was 400 hours. image 3 It is the change diagram of the corrosion weight loss of the sample after each cycle of the test, and the regression analysis is carried out on the data of the corrosion weight loss of the...

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Abstract

The invention provides a test method for simulating a corrosion process of stainless steel in an industrial marine atmosphere, and belongs to the technical field of metal corrosion atmosphere simulation. The method comprises the following steps: firstly performing ultraviolet irradiation test on a sample by using stainless steel as the test material, wherein the irradiation intensity is (60+ / -10)W / m2, the temperature is (50+ / -10) degrees centigrade, and the test time is 50 hours; then using the mixed solution of 1% to 5% NaCl added with 0.1% to 0.3% NaSO as an impregnation solution, performing alternate wetting and drying test on the sample in the order of "dipping to drying" in a periodic infiltration test machine every 30 minutes, wherein the solution is dipped for 7-8 minutes and driedfor 22-23 minutes, the temperature of the dipping solution is (40+ / -5) degrees centigrade, the relative humidity in the test machine used is 90% RH+ / -5% RH, and the test time is 50 hours. The invention has the characteristics of simulation, acceleration and reproducibility, and can be used to study the corrosion behavior rule of stainless steel in industrial marine atmosphere, and quickly evaluate and predict its resistance to industrial marine atmospheric corrosion, which provides a basis for rational material selection.

Description

technical field [0001] The invention relates to the technical field of metal atmospheric corrosion simulation, in particular to a test method for simulating the corrosion process of stainless steel in an industrial marine atmospheric environment. Background technique [0002] Due to its excellent corrosion resistance, stainless steel has been widely used in various industrial fields. The industrial marine atmospheric environment is one of the most severe natural corrosion environments, and the corrosion status of stainless steel in this environment has also received more and more attention. [0003] At present, countries generally adopt the establishment of corrosion test stations to conduct exposure tests to study the corrosion status of materials in industrial marine atmospheric environments. Exposure test in natural environment is the most effective test method for studying atmospheric corrosion, which can truly reflect the corrosion resistance of materials in typical cl...

Claims

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Application Information

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IPC IPC(8): G01N17/00
CPCG01N17/006
Inventor 肖葵白子恒李晓刚董超芳吴俊升
Owner UNIV OF SCI & TECH BEIJING
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