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Detection and evaluation method of simulation acceleration metal acid atmospheric environment corrosion

A metal material, atmospheric environment technology, applied in the direction of weather resistance/light resistance/corrosion resistance, analytical materials, measuring devices, etc., can solve the problems of large regional and environmental limitations, high economic cost, long achievement transformation cycle, etc., to achieve high efficiency Effects of evaluation methods and rapid detection methods

Inactive Publication Date: 2017-06-13
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the economic cost of the hanging piece test in the actual atmospheric environment is high, the experimental cycle is long, the regional and environmental limitations are large, and the result transformation cycle is long, which is not conducive to practical application

Method used

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  • Detection and evaluation method of simulation acceleration metal acid atmospheric environment corrosion
  • Detection and evaluation method of simulation acceleration metal acid atmospheric environment corrosion
  • Detection and evaluation method of simulation acceleration metal acid atmospheric environment corrosion

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Experimental program
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Embodiment 1

[0035] Taking weathering steel as the metal sample, the present invention compares the detection and evaluation method of simulating accelerated acidic atmospheric environment corrosion with the commonly used neutral high and low temperature alternating damp heat test, and its specific detection steps are as follows:

[0036] (1) Neutral high and low temperature alternating damp heat test, refer to GB / T 2423.4-2008 Environmental testing for electrical and electronic products Part 2: Test method Test Db alternating damp heat (12h + 12h cycle), the test periods are 5, 10, 20, 50 cycles, each cycle is 12h, the experimental environment is a temperature of 25°C and a humidity of 60%. Three parallel samples were taken for each group of experiments, and the weight gain, corrosion rate and surface morphology before and after corrosion were detected. The experimental results are shown in Table 1. Figure 1~5 , At the same time, the corrosion products were analyzed, see Table 2.

[003...

Embodiment 2

[0049] Utilize the present invention to be used for simulating accelerated acid atmospheric environment corrosion detection and evaluation method contrast the acid atmospheric environment corrosion performance of the spring steel metal material of different chemical composition, carry out following test, its material chemical composition is as shown in table 3.

[0050] 1) Prepare the sample: the sample is disc-shaped, with a diameter of 60mm, a thickness of 2.5mm, and a surface roughness of 8μm. The surface is deburred, cleaned and dried before corrosion, and the weight is accurately weighed to the nearest 0.0001g ;

[0051] 2) Prepare a simulated acidic atmospheric environment corrosion solution: prepare a sodium bisulfite solution with a concentration of 2.0±0.5g / L, use 15% hydrochloric acid, adjust the pH value to 4.0, and spread the corrosion solution evenly on the On the surface of the sample, 2.0mL of corrosion solution is applied every cycle;

[0052] 3) Determination...

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Abstract

The invention discloses a detection and evaluation method of simulation acceleration metal acid atmospheric environment corrosion. The method comprises the steps of preparing test specimens, wherein the size and the surface roughness of the test specimens must be identical; 2, preparing a simulation acid atmospheric environment corrosion solution, wherein a test solution needed by a high-low-temperature alternation damp and heat experiment test and electrochemical polarization curve corrosion is prepared; 3, determining a corrosion condition, wherein the high-low-temperature alternation damp and heat experiment test is conducted on the specimens in sequence; 4, determining evaluation indexes, wherein a weight increment, a corrosion velocity, a surface topography and a corrosion potential are adopted as corrosion performance indexes. According to the detection and evaluation method of the simulation acceleration metal acid atmospheric environment corrosion, through the high-low-temperature alternation damp and heat experiment test, a simple, convenient, fast and efficient detection and evaluation method of the simulation acceleration metal acid atmospheric environment corrosion is designed, the method is high in practicability, the corrosion which occurs in an outdoor acid atmospheric environment can be better represented, and a method is provided for a related metal material corrosion performance study.

Description

technical field [0001] The invention belongs to the technical field of metal material corrosion detection and evaluation analysis, and in particular relates to a detection and evaluation method for simulating accelerated corrosion of metal materials in an acidic atmospheric environment. Background technique [0002] Metal materials will corrode when exposed to the atmosphere, especially in acidic atmospheric environment, the corrosion phenomenon is more serious. Therefore, the corrosion and corrosion resistance of metal materials has always been one of the important performance indicators for the use and life evaluation of materials in atmospheric environments, and is also one of the key areas of corrosion research. [0003] When metal materials are exposed to the atmosphere, several situations such as dry corrosion and wet corrosion mainly occur. Dry corrosion refers to the corrosion of metal materials in an atmospheric environment with a relative humidity of less than 30%...

Claims

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Application Information

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IPC IPC(8): G01N17/02
Inventor 刘洁安治国任玲玲葛晶晶薛峰禹青霄海岩杨慧贤禹继志
Owner HEBEI IRON AND STEEL
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