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Method for determining corrosion performance of bonding interface of bimetal composite material by using a micro-area electrochemical method

A composite material, corrosion performance technology, used in analytical materials, preparation of test samples, weather resistance/light resistance/corrosion resistance, etc., can solve problems such as difficult measurement, and achieve the effect of saving the required time

Pending Publication Date: 2020-12-18
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional method of measuring under a microscope after metallographic corrosion is usually used in the industry. Due to the large subjectivity, it is difficult to measure accurately

Method used

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  • Method for determining corrosion performance of bonding interface of bimetal composite material by using a micro-area electrochemical method
  • Method for determining corrosion performance of bonding interface of bimetal composite material by using a micro-area electrochemical method
  • Method for determining corrosion performance of bonding interface of bimetal composite material by using a micro-area electrochemical method

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0068] Research on interface corrosion performance of 316 / Q345 composite plate in simulated industrial atmospheric environment:

[0069] (1) Take a cross-sectional sample of 316 / Q345 composite board with a side length of 30mm×30mm.

[0070] (2) Grind and polish the surface of the section sample step by step, corrode the bonding interface with a metallographic etchant, preliminarily determine and mark the positions of the base material Q345, the bonding interface and the coating 316 stainless steel, and polish the sample again for later use.

[0071] (3) Make molds for creating different thin liquid films (simulating condensation in different atmospheric environments). Take a plastic plate with a thickness of 0.2mm, and use a carving knife to carve out such as figure 1 template shown.

[0072] (4) Configure 0.01mol / L NaHSO 3 The solution simulates the industrial atmosphere, the figure 1 The template is placed on the surface of the cross-section of the composite material, an...

specific Embodiment 2

[0080] Research on interfacial corrosion performance of 2205 / Q235 composite steel bar in simulated marine environment and pastoral atmospheric environment:

[0081] (1) Take a cross-section sample of 2205 / Q235 composite steel bar with a diameter of 32mm and a thickness of 15mm.

[0082] (2) Grind and polish the surface of the section sample step by step, corrode the bonding interface with a metallographic etchant, initially determine and mark the positions of the substrate Q235, the bonding interface and the cladding 2205 stainless steel, and polish the sample again for later use.

[0083] (3) Make molds for creating different thin liquid films (simulating condensation in different atmospheric environments). Take a plastic plate with a thickness of 0.2mm, and use a carving knife to carve out such as figure 1 template shown.

[0084] (4) Configure 0.5% NaCl solution to simulate the marine atmospheric environment, and use deionized water to simulate the pastoral atmospheric en...

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Abstract

The invention provides a method for determining corrosion performance and interface width at a bonding interface of a bimetal composite material by using a micro-area electrochemical method, which comprises the following steps of: performing potential scanning of a base material-a bonding interface-a coating on a section sample of the composite material by using a scanning electrochemical workstation; characterizing the corrosion potential of the bonding interface, and determining the interface width for researching the corrosion performance of the composite material bonding interface. The section of the composite material can be pretreated by adopting different solutions for simulating the atmospheric environment to simulate a thin liquid film formed on the surface of the composite material in the corrosive environment, so that the corrosion performance of the composite material bonding interface in different atmospheric environments is studied. The method can be used for rapidly, nondestructively and quantitatively determining the corrosion performance and the interface width of the bimetal composite material at the bonding interface under different simulated atmospheric environments.

Description

technical field [0001] The invention relates to the technical field of corrosion performance measurement, in particular to a method for micro-area electrochemical measurement of the corrosion performance of a bimetallic composite material bonding interface. Background technique [0002] Bimetallic composite materials are made by combining two metals with different properties by means of different manufacturing processes. The metal with better corrosion resistance is used as the cladding layer and the metal with better strength is used as the base material. Advantages and low cost, gradually being widely used in various fields. At present, stainless steel-steel, titanium-steel and copper-steel are widely used. The bonding interface of bimetallic composites refers to the area where the substrate and the cladding are bonded to each other. When the substrate and the cladding are in contact with each other, chemical reactions or physical and chemical interactions will occur, suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/02G01N17/04G01N17/00G01N1/28G01N1/32G01B7/02
CPCG01N17/02G01N17/043G01N17/006G01N1/286G01N1/32G01B7/02G01N2001/2873
Inventor 李琳陈义庆钟彬艾芳芳高鹏苏显栋伞宏宇
Owner ANGANG STEEL CO LTD
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