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Method for measuring material critical non-corrosion air concentration value

A technology of aeration concentration and gas, which is applied in the field of measuring corrosion-free parameters of materials

Inactive Publication Date: 2006-05-17
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still no method to test the cavitation stability of materials under aeration measures, let alone measure the critical anti-corrosion aeration concentration value

Method used

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  • Method for measuring material critical non-corrosion air concentration value
  • Method for measuring material critical non-corrosion air concentration value
  • Method for measuring material critical non-corrosion air concentration value

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The air hole plate is made of plexiglass with a thickness of 3 mm, the air hole diameter is 0.15 mm, the opening rate is 49%, and the plum blossom shape is arranged.

[0038] The vibration frequency of the magnetostrictive instrument used in this embodiment is 19.3kHz, the amplitude is 50 μm, and the power is 1000W. The test piece is 0Cr13Ni9Ti stainless steel, and the test solution used is water, such as figure 1Shown, add water in the container 14 that test solution is housed in magnetostrictive instrument of the present invention, 0Cr13Ni9Ti stainless steel test piece 13 is contained in magnetostrictive instrument horn 12 lower ends, adjust test piece 13 height, make test piece 13 Just submerged in water for 3mm, start the magnetostrictive instrument to make the test piece 13 axially vibrate at high frequency in the water, since the vibration frequency of the magnetostrictive instrument is 19.3kHz, the amplitude is 50μm, and the power is 1000W, so the test piece 13 vi...

Embodiment 2

[0040] The test equipment is the same as in Example 1, and the material of the test piece is CrMnN stainless steel that has undergone solid-liquid treatment at 1000°C + tempering heat treatment at 600°C. Test method and test condition are exactly the same as embodiment one.

[0041] According to the measured data of the test, the relationship curve between the mass loss of the test piece and the gas concentration and test time is made, see image 3 . The aeration concentration value C12 It can be obtained by interpolating enough experiments between C3 and C4.

Embodiment 3

[0043] The orifice plate 25 in Embodiment 1 and 2 is disassembled, and air is mixed by microporous air distribution method. The aeration device adopts the zy type variable microporous aerator of Hangzhou Lanke Environmental Protection Technology Co., Ltd., the diameter of the synthetic rubber diaphragm is Φ200mm, the size of the aerator is Φ215mm, and the air bubbles generated by the aerator are directly ≤3mm. Other test conditions, test pieces and method steps are the same as in Embodiment 1. The relationship curve between air concentration and test time is as follows: Figure 4 shown.

[0044] Due to the different system configurations, under the same air pressure, the aeration concentration is not equal to that in Examples 1 and 2. When the readings of the barometer 23 are P1=0.001MPa, P2=0.0015, P3=0.002MPa, and P4=0.034MPa, the corresponding aeration concentration values ​​are C5, C6, C7, and C8.

[0045] The critical non-corrosion gas concentration value CX under this...

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PUM

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Abstract

The present invention relates to a method for measuring critical non-corrosive aerated concentration value of material. It is characterized by that when the material is measured, its testing liquor is a gas-liquid mixed liquor. According to the experiment requirements of test piece it can define the power and amplitude of magnetostrictometer which is used for making experiment, the testing liquor is aerated, when the aerated concentration is respectively C1, C2, C3....., CN, the experiment can be made. Said invention also provides the concrete method and steps of said measuring experiment.

Description

technical field [0001] The invention relates to a method for measuring the anti-corrosion parameter of a material, in particular to a method for measuring the critical anti-corrosion gas entrainment concentration value of the material. Background technique [0002] Cavitation erosion is the surface damage caused by the formation and collapse of cavitation bubbles in the liquid medium due to local pressure changes under certain ambient temperature conditions, and the material is continuously impacted by high-pressure, high-speed micro-jet. Gas turbines in thermal power plants and water turbines in hydropower stations often cause partial early failure due to cavitation, resulting in reduced efficiency, reduced service life and greatly increased equipment maintenance costs, resulting in astonishing energy and material losses. For example, the cavitation damage of the turbines in a hydropower station is serious, and it needs to be overhauled every two years. The maintenance cost...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01N5/04
Inventor 吴建华严忠民骆超阮仕平
Owner HOHAI UNIV
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