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Method for detecting bonding strength between weathering steel rust layer and matrix

A technology combining strength and weathering steel, applied in measuring devices, instruments, and mechanical devices, etc., it can solve problems such as relying on high-end equipment, cumbersome testing, and inability to meet engineering requirements.

Active Publication Date: 2021-01-01
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the test of this method is cumbersome, and a large number of calculations are required to determine whether the rust layer plays a protective role.
[0009] At present, there are still many deficiencies and shortcomings in the related technologies of how to judge the protective ability of the weathering steel rust layer, for example: the operation method is complicated, relying on high-end equipment, and cannot meet the needs of the project, so there is an urgent need for a simple and fast judgment method to detect weathering The protective ability of steel rust layer

Method used

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  • Method for detecting bonding strength between weathering steel rust layer and matrix
  • Method for detecting bonding strength between weathering steel rust layer and matrix
  • Method for detecting bonding strength between weathering steel rust layer and matrix

Examples

Experimental program
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Effect test

Embodiment 1

[0044]The Q420qENH weathering steel exposed in Qinhuangdao, Hebei Province for 2 years was machined into 150mm*100mm*4mm size samples. First, use the 406 glue sold on the market to glue the rusty test sample and the fixture together, fix it and let it stand for 1 hour to make the sample and the fixture bond firmly; second, glue the firmly bonded sample Fix it on the tensile testing machine; third, run the tensile testing machine until the sample and the jig are separated, and record the force generated during the separation; fourth, repeat the above steps to stretch and separate the rust layer and the sample , when the separation reaches the third time, the combination fails, and the combination success and combination failure are shown in the figure Figure 14 As shown, write down the binding force of each rust layer as F1, F2, and F3. Through the pressure formula, calculate the pressure per unit area of ​​each rust layer separation, such as Figure 4 shown. After each rus...

Embodiment 2

[0046] The weathering steel in Q420qENH is machined into 150mm*100mm*4mm size samples, and the accelerated corrosion test is carried out in a simulated industrial atmospheric environment, referring to the standard of TB / T 2375 "Periodic Infiltration Corrosion Test Method for Weathering Steel for Railways", the corrosion solution is 0.01 mol / L NaHSO 3 The solution has a pH value in the range of about 4.4 to 4.8. The conditions for designing the test chamber: the air temperature is 27±1°C, the solution temperature is 45±2°C, and the relative humidity is 70%±5%. , the infiltration duration is 12 min, and the test time is 432h. After the test, first, use the 406 glue sold on the market to glue the rusty test sample and the fixture together, fix it and let it stand for 3 hours to make the sample and the fixture bond firmly; Firmly fix the sample on the tensile testing machine; third, run the tensile testing machine until the sample and the fixture are separated from each other, a...

Embodiment 3

[0048] The Q420qENH weathering steel exposed in Qinhuangdao, Hebei Province for 0.5 years was machined into a sample with a size of 150mm*100mm*4mm. First, use the 406 glue sold on the market to glue the rusty test sample and the fixture together, fix it and let it stand for 2 hours to make the sample and the fixture bond firmly; second, glue the firmly bonded sample Fix it on the tensile testing machine; third, run the tensile testing machine until the sample and the fixture are separated from each other, and record the magnitude of the force generated at the time of separation; fourth, repeat the above steps to stretch the rust layer and the sample Separation for 3 times, record the binding force of each rust layer as F1, F2, F3. Through the pressure formula, calculate the pressure per unit area of ​​each rust layer separation, such as Figure 8 shown. After each rust layer is separated to obtain corrosion products and collected, the corrosion products are characterized by...

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Abstract

The invention discloses a method for detecting the bonding strength between a weathering resistant steel rust layer and a matrix. The comprises the following steps of S1, bonding a rusted weathering resistant steel sample with a fixture of a tensile testing machine by using commercially available glue with certain tensile strength, and standing for a period of time to fully bond the sample with the fixture; S2, fixing the firmly bonded sample on the tensile testing machine; S3, operating the tensile testing machine until the sample is separated from the fixture; S4, repeating the step S1-S3 tocarry out stretching separation on the same position of the sample for n times, and recording the binding forces F1, F2, F3... Fn when the sample is separated from the fixture each time; and S5, calculating the pressure intensity per unit area when the sample is separated from the clamp every time according to a pressure intensity calculation formula, detecting the bonding strength between the weathering steel rust layer and the matrix by comparing the pressure intensity per unit area, and further judging the protection capacity of the weathering steel surface rust layer. By adopting the method, the protection capacity of the weathering steel rust layer can be effectively judged.

Description

technical field [0001] The invention relates to a method for detecting the bonding strength between a weather-resistant steel rust layer and a substrate, and belongs to the technical field of detection and analysis of the weather-resistant steel rust layer. Background technique [0002] Compared with ordinary carbon steel, weathering steel can form a dense and stable rust layer with good bonding force in the atmosphere, which can effectively prevent the corrosive medium from penetrating into the internal corrosion matrix, thereby improving the corrosion resistance of weathering steel and achieving rust-stopping. The role of rust. However, since the formation of stable rust layer of weathering steel is affected by many aspects, such as atmospheric environment, air relative humidity, surface state, etc., the formation of rust layer with protective ability is complicated and changeable, and it is necessary to judge whether the rust layer of weathering steel has protection or no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04
CPCG01N19/04
Inventor 王青峰于强杨啸雨
Owner YANSHAN UNIV