Electric chemical method for accelerated corrosion on stainless steel welding seam region

A technology to accelerate corrosion and stainless steel, applied in the field of electrochemistry, can solve the problems of accelerated corrosion of stainless steel, and achieve the effect of accelerating the corrosion rate

Inactive Publication Date: 2018-05-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solved the problem that the electrochemical accelerated corrosion could not accelerate the corrosion of stainless steel and obtain a realistic corrosion morphology in the past

Method used

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  • Electric chemical method for accelerated corrosion on stainless steel welding seam region
  • Electric chemical method for accelerated corrosion on stainless steel welding seam region
  • Electric chemical method for accelerated corrosion on stainless steel welding seam region

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1 Preparation of working electrode

[0040] 1.1 Use wire cutting to cut T4003 to the required size, and its working surface should include fusion zone, heat-affected zone, and base metal zone. Among them, the welding line should be located in the center of the sample.

[0041] 1.2 Perform passivation treatment on the stainless steel weld sample, using a phosphoric acid aqueous solution with a mass volume ratio of 3% (phosphoric acid mass: aqueous solution volume = 3%) and a potassium dichromate aqueous solution with a mass volume ratio of 5% (dichromic acid mass : aqueous solution volume=5%) in a water bath at 85 degrees for 15 minutes.

[0042] 1.3 The back of the stainless steel weld is welded with copper wire, and the copper wire is used as the connection wiring with the electrochemical device.

[0043] 1.4 Use epoxy resin and PVC pipe to encapsulate the sample.

[0044] 1.5 After the epoxy resin is completely cured, use water sandpaper to polish to 2000 mesh, use a...

Embodiment 2

[0065] 1 Preparation of working electrode

[0066] 1.1 Use wire cutting to cut T4003 to the required size. The working surface should include the fusion zone, heat-affected zone, and base metal zone. The welding line should be located in the center of the sample.

[0067] 1.2 Perform passivation treatment on the stainless steel weld sample, using a phosphoric acid aqueous solution with a volume ratio of 3% and an aqueous solution of potassium dichromate with a mass volume ratio of 5% in a water bath at 85 degrees for 15 minutes.

[0068] 1.3 The back of the stainless steel weld is welded with copper wire, and the copper wire is used as the connection wiring with the electrochemical device.

[0069] 1.4 Use epoxy resin and PVC pipe to encapsulate the sample.

[0070] 1.5 After the epoxy resin is completely cured, use water sandpaper to polish to 2000 mesh, use alcohol to dehydrate and degrease, dry it with cold wind, and place it in a drying tank for use.

[0071] 1.6 After d...

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PUM

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Abstract

The invention discloses an electric chemical method for accelerated corrosion on a stainless steel welding seam region. The method comprises the following experiment steps of work electrode preparation, stable corrosion potential test and electrochemical accelerated corrosion. The method provided by the invention solves the problems that the existing electrochemical accelerated corrosion cannot beused for accelerated corrosion on stainless steel to obtain the practical corrosion morphology. The test method can be used for performing electrochemical accelerated corrosion on the stainless steelregion; the corrosion speed of the stainless steel is accelerated; the corrosion resistance performance weakness relationship of different regions of the welding seam in the corrosion media can be judged; the correct judgment is made on the corrosion behavior of a welding joint used in engineering in the use environment.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to an electrochemical method for accelerating corrosion of stainless steel weld areas. Background technique [0002] Corrosion of metal refers to the deterioration and destruction caused by chemical or electrochemical interaction with the surrounding medium in the natural environment or under working conditions. For this reason, parts and equipment with high requirements on size, strength and surface are usually made of stainless steel. The reason for the corrosion resistance of stainless steel is that a thin passive layer will be formed on its surface in the corrosive medium. The thin layer can separate the corrosion medium from the metal substrate, so that the corrosion rate of the metal itself is greatly reduced. However, stainless steel, aluminum alloy, aluminum and other metals with passivation properties are prone to pitting corrosion in the medium containing chlo...

Claims

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Application Information

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IPC IPC(8): G01N17/02G01N5/04
CPCG01N5/04G01N17/006G01N17/02
Inventor 高志明苗伟行邵毅肖丰强胡文彬刘永长修妍
Owner TIANJIN UNIV
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