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In-Situ Diffraction and Imaging Experimental Method for Electrochemical Testing of Metallic Materials

A material electrochemistry and experimental method technology, which is applied in the field of in-situ diffraction and imaging experiments for electrochemical testing of metal materials, can solve the problems of combination and cannot directly observe the real-time transformation of dynamic corrosion substances of metal materials, and achieves simple steps and high space. and the effect of the time-resolved advantage

Active Publication Date: 2019-04-19
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to aim at the above-mentioned existing metal material corrosion detection method, the dynamic corrosion inside the metal material and the real-time transformation of the substance cannot be directly observed, and the kinetic process, substance transformation information and electric current of the metal material sample in the test cannot be In order to solve the problem of combining chemical test data, an experimental method of in situ diffraction and imaging for electrochemical testing of metal materials is proposed. This method can directly observe the initiation and expansion of corrosion of metal materials, the dynamic evolution of corrosion interface and corrosion rate, and the Dynamic information such as the generation of different corrosion products and the transformation of substances

Method used

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  • In-Situ Diffraction and Imaging Experimental Method for Electrochemical Testing of Metallic Materials

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Embodiment 1

[0029] This embodiment discloses an in-situ imaging experimental method for electrochemical testing of metal materials, taking aluminum alloy as an example, including the following steps:

[0030] (1) Ultra-thin sample preparation: the aluminum alloy to be tested was cut into thin slices with a thickness of 1 mm by wire cutting, and then the front and back sides of the sample were polished with water abrasive paper. In order to ensure the quality of synchrotron radiation imaging, 1000-mesh sandpaper was used in the final grinding process, and the thickness of the final ultra-thin sample prepared was 300 μm. The aluminum alloy ultra-thin sample was cut into a rectangle with a width and length of 8mm×10mm, and ultrasonically cleaned with alcohol solution Sample to ensure surface cleanliness.

[0031] (2) Paint the surface of the ultra-thin sample: In order to avoid crevice corrosion during the electrochemical test, a layer of corrosion-resistant paint is applied on the surface o...

Embodiment 2

[0040] This embodiment discloses an in-situ diffraction experimental method for electrochemical testing of metal materials, taking copper alloy as an example, including the following steps:

[0041] (1) Ultra-thin sample preparation: Process the copper alloy sample to be tested into a thin slice with a size of 10mm×8mm×1mm, and then polish the front and back sides of the sample with water abrasive paper. The final grinding process uses 1000-mesh sandpaper, and the thickness of the final ultra-thin sample is 50 μm. The sample is ultrasonically cleaned with an alcohol solution to ensure a clean surface.

[0042] (2) Paint the surface of the ultra-thin sample: In order to avoid crevice corrosion during the electrochemical test, a layer of corrosion-resistant paint was applied on the surface of the prepared ultra-thin sample, and attention was paid to ensure that the thickness of the paint layer on the surface of the sample was uniform (the thickness was about 50μm).

[0043] (3)...

Embodiment 3

[0050] This embodiment discloses an in-situ diffraction and imaging experimental method for electrochemical testing of metal materials, which is characterized in that it includes the following steps:

[0051] (1) Process the metal material to be tested into a thin slice with a thickness of about 1 mm, and then use water-grinding sandpaper to grind the sample step by step until a rectangular thin slice sample with a thickness of 50-500 μm is required. The thickness of the sample is required to be uniform, and in order to ensure synchrotron radiation imaging Quality, the type of sandpaper in the last grinding process is not less than 1000 mesh. The rectangular thin slice samples were ultrasonically cleaned with alcohol solution to ensure the surface of the rectangular thin slice samples was clean. The length and width of the rectangular sheet sample are less than 20mm×20mm. Due to the limited size of the X-ray spot, the maximum spot size is about 10mm×10mm. In order to collect ...

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Abstract

The invention provides a metal material electrochemical test in situ diffraction and imaging experiment method. The method comprises the following steps: cutting the metal material to be detected into a rectangular sheet sample with thickness of 50-500 mum; coating a corrosion resistant paint on both sides of the rectangular sheet sample; embedding the rectangular sheet sample in epoxy resin; fixing embedded resin sample on a detection slit of a side wall of an electrochemical cell; placing the electrochemical cell fixed with embedded resin sample in a synchrotron radiation X-ray diffraction / imaging working platform, so as to put the X-ray spot on a contact interface of a working electrode surface and an electrolyte; opening a synchrotron radiation X-ray optical shutter, adjusting the X-ray energy and exposure time, opening an electrochemical workstation, stabilizing the potential, and collecting data by the detector. The metal material electrochemical test in situ diffraction and imaging experiment method can realize in situ diffraction and visualization of metal material in the electrochemical testing process.

Description

technical field [0001] The invention relates to electrochemical technology, in particular to an in-situ diffraction and imaging experimental method for electrochemical testing of metal materials. Background technique [0002] Corrosion of metal materials will not only cause waste of materials, but also cause catastrophic accidents, environmental pollution, and casualties in severe cases. Therefore, research on corrosion mechanisms, corrosion damage prediction, corrosion evaluation, and life analysis have always been the focus of many scholars. Among various corrosion test methods, electrochemical test is one of the laboratory accelerated test methods. It can not only study the corrosion rate of materials quickly and accurately, but also can be used to study the corrosion mechanism of materials in depth. Therefore, it is widely used in metal Corrosion and protection of materials. At present, the research on the electrochemical corrosion behavior of metal materials mostly use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/02G01N23/207G01N23/2005
CPCG01N17/006G01N17/02G01N23/20
Inventor 王同敏杨芬芬曹飞李仁庚康慧君陈宗宁曹志强李廷举
Owner DALIAN UNIV OF TECH
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