Evaluating method for atmosphere corrosion resistance of dissimilar steel welded joint

A technology of atmospheric corrosion resistance and welded joints, which is applied in the fields of weather resistance/light resistance/corrosion resistance, analysis materials, measuring devices, etc. It can solve the problem of long test time, only consideration, and the inability to objectively evaluate the resistance to atmospheric corrosion of welded joints of dissimilar steel materials Performance and other issues to achieve the effect of improving accuracy and accelerating the effect

Active Publication Date: 2018-11-27
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that the single component of the accelerated corrosion test solution cannot simulate the real atmospheric environment, and the test time is long and needs to be carried out for 90 days; in addition, the evaluation standard is represented by the average corrosion amount of NO.1 in the patent as a relative value of 100 , the evaluation index has limitations; and the relative corrosion amount only considers the weld and the base metal, ignoring the key part of the heat-affected zone
[0007] The first two of the above three patents are to evaluate the corrosion resistance of welded joints

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example 1:

[0033] This embodiment provides a method for evaluating the atmospheric corrosion resistance of a welded joint of dissimilar steels, which includes the following steps:

[0034] 1) Sample preparation: The welded joint sample of the Q420qENH / Q345qE dissimilar base metal submerged arc welding process is machined and polished with a grinder to a size of 100mm*50mm*8mm, the surface finish is level 7, and the weld is in the center of the sample. Perform hot alkaline degreasing→hot water cleaning→cold water cleaning→deionized water cleaning→alcohol cleaning→drying, and measure the original thickness H of the welded joint sample 0 =8.00mm.

[0035] 2) Accelerated corrosion test: According to the actual service environment of Q420qENH / Q345qE bridge steel dissimilar base metal welded joints, a corrosion solution of 0.5wt%NaCl+0.35wt%Na is configured 2 SO 4 +0.5wt%Na 2 CO 3 +0.5wt%(NH 4 ) 2 NO 3 Mixed solution +0.26g / LFeCl 3 , PH is 7.2. Adopt periodic immersion corrosi

Example Embodiment

[0038] Example 2:

[0039] This embodiment provides a method for evaluating the atmospheric corrosion resistance of a welded joint of dissimilar steels, which includes the following steps:

[0040] 1) Sample preparation: The welded joint sample of the EH36 / 09CuPCrNi dissimilar base metal gas shielded welding process is machined and polished with a grinder to a size of 80mm*40mm*10mm, the surface finish is level 7, and the weld is located in the center of the sample. Perform hot alkaline degreasing→hot water cleaning→cold water cleaning→deionized water cleaning→alcohol cleaning→drying, and measure the original thickness H of the welded joint sample 0 10.00mm.

[0041] 2) Accelerated corrosion test: According to the actual service environment of the EH36 / 09CuPCrNi dissimilar base metal welding joint, a corrosion solution of 0.4wt% NaCl+0.35wt% Na is configured 2 SO 4 +0.45wt%Na 2 CO 3 +0.6wt%(NH 4 ) 2 NO 3 Mixed solution+0.38g / LFeCl 3 , PH is 6.8. Adopt periodic immersion corrosion

Example Embodiment

[0044] Example 3:

[0045] This embodiment provides a method for evaluating the atmospheric corrosion resistance of a welded joint of dissimilar steels, which includes the following steps:

[0046] 1) Sample preparation: The welded joint sample of 15MnNiCrMoV / 1Cr13 dissimilar base metal manual welding process is machined and polished with a grinder to a size of 80mm*40mm*6mm, the surface finish is level 7, and the weld is located in the center of the sample. Perform hot alkaline degreasing→hot water cleaning→cold water cleaning→deionized water cleaning→alcohol cleaning→drying, and measure the original thickness H of the welded joint sample 0 It is 6.00mm.

[0047] 2) Accelerated corrosion test: According to the actual service environment of 1Cr13 / 15MnNiCrMoV dissimilar base metal welded joints, a corrosion solution of 0.3wt% NaCl+0.2wt% Na is configured 2 SO 4 +0.5wt%Na 2 CO 3 +0.5wt%(NH 4 ) 2 NO 3 Mixed solution+0.48g / LFeCl 3 , The pH is 3.5. Adopt periodic immersion corrosion t

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Abstract

The invention provides an evaluating method for atmosphere corrosion resistance of a dissimilar steel welded joint. A periodical immersion corrosion test which well fits a natural atmospheric environment is adopted as an accelerating means, and a test solution is prepared to serve as an accelerating corrosion solution for simulating the typical atmospheric environment, wherein the test solution isprepared by a mixed solution of (0.3-0.6)% NaCl, (0.15-0.55)% NaSO4, (0.4-0.7)% Na2CO3 and (0.3-0.6)% (NH4)2NO3 and (0.2-0.5)g/L FeCl3, wherein FeCl3 serves as a strong oxidant and has an obvious accelerating effect, and by adjusting the pH value, common atmosphere with the pH value of 6.5-7.2 and polluted atmosphere with the pH value of 3.0-6.0 can be simulated. The method for representing the corrosion resistance is simple and easy to operate, the thicknesses of a specimen before and after corrosion are measured, the corrosion resistance representation numerical value is calculated, and thus the atmosphere corrosion resistance of dissimilar steel is evaluated genuinely and reliably. The atmosphere corrosion resistance of the dissimilar steel welded joint after the periodical immersion accelerating corrosion test is evaluated, the feature that base materials at the two sides have corrosion resistance difference and galvanic corrosion, two standards are stepwise put forward, and the accuracy of evaluating indexes is improved.

Description

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Claims

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Application Information

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Owner ANGANG STEEL CO LTD
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