Flaw detecting method for stainless steel/carbon steel composite material

A technology for composite materials and flaw detection, which is applied in the preparation of test samples, optical testing of flaws/defects, etc., can solve problems such as high cost, inability to accurately identify damaged parts of stainless steel/carbon steel composite materials, and limited sample size , to speed up the corrosion process, improve the effect of flaw detection and shorten the time of flaw detection

Inactive Publication Date: 2019-04-02
南工大溧阳新材料研发中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above problems that the damaged part of the stainless steel / carbon steel composite material cannot be accurately identified or high cost is required for accurate identification, and at the same time, in order to solve the problem of limited sample size in the past, the present invention provides a method that can accurately Flaw detection method for stainless steel / carbon steel composite materials for judging damaged parts

Method used

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  • Flaw detecting method for stainless steel/carbon steel composite material
  • Flaw detecting method for stainless steel/carbon steel composite material

Examples

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Effect test

Embodiment 1

[0026] Prepare a sodium chloride solution with a concentration of 5%, pour it into the water tank, place a 2m long stainless steel / carbon steel bimetallic composite rebar in the sodium chloride solution in the water tank, and take out the stainless steel / carbon steel bimetallic composite after 24 hours For rebar, if dark green rust spots are detected, the position of the dark green rust spots is the cracking site. During the immersion process, galvanic corrosion and crevice corrosion of dissimilar metals will occur on the exposed carbon steel at the cracked part, and the corrosion product is dark green rust spots, while the surface of the uncracked stainless steel does not change significantly.

Embodiment 2

[0028] Prepare a sodium chloride solution with a concentration of 0.1%, pour it into the water tank, place a 2m-long stainless steel / carbon steel bimetallic composite rebar in the sodium chloride solution in the water tank, and take out the stainless steel / carbon steel bimetallic composite after 48 hours For rebar, if dark green rust spots are detected, the position of the dark green rust spots is the cracking site. During the immersion process, galvanic corrosion and crevice corrosion of dissimilar metals will occur on the exposed carbon steel at the cracked part, and the corrosion product is dark green rust spots, while the surface of the uncracked stainless steel does not change significantly.

Embodiment 3

[0030] Prepare a sodium chloride solution with a concentration of 10%, pour it into the water tank, place a 2m long stainless steel / carbon steel bimetallic composite rebar in the sodium chloride solution in the water tank, and take out the stainless steel / carbon steel bimetallic composite after 48 hours For rebar, if dark green rust spots are detected, the position of the dark green rust spots is the cracking site. During the immersion process, galvanic corrosion and crevice corrosion of dissimilar metals will occur on the exposed carbon steel at the cracked part, and the corrosion product is dark green rust spots, while the surface of the uncracked stainless steel does not change significantly.

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Abstract

The invention discloses a flaw detecting method for a stainless steel/carbon steel composite material. Dark green rust spots appear after the stainless steel/carbon steel composite material is immersed in a sodium chloride solution for a period of time. The portion where the dark green rust spot are located is a damaged portion. Compared with the conventional flaw detecting method, the invention has the advantages of accuracy and low cost.

Description

technical field [0001] The invention belongs to the technical field of composite material detection, and in particular relates to a flaw detection method for stainless steel / carbon steel composite materials. Background technique [0002] The production process of stainless steel / carbon steel composite profiles mostly adopts the pre-lamination of stainless steel and carbon steel, and then combines with the existing profile rolling technology to prepare stainless steel / carbon steel composite profiles. Bimetallic composite profiles mainly include flat steel, angle steel, channel steel, threaded steel and other profiles. These profiled steels are heated and rolled during the production process. During the continuous deformation of the profiled steel billets, the outer stainless steel layer will be broken. Therefore, the quality of the profile steel needs to be tested during the process research and development and manufacturing process, but in the production process of the bimet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/91G01N1/30
CPCG01N1/30G01N21/91
Inventor 常辉李广州丁毅师红旗
Owner 南工大溧阳新材料研发中心有限公司
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