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A kind of stainless steel corrosion agent and metallographic preparation method for fuel cell bipolar plate

A fuel cell and stainless steel technology, which is applied in the field of stainless steel etchant for fuel cell bipolar plates and metallographic preparation, can solve the problems of complex solution composition and preparation process, long standing time of corrosive solution, and difficulty in preparing metallographic samples, etc. To achieve the effect of uniform and clear metallographic structure, less harm and easy preparation

Active Publication Date: 2021-05-11
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Due to the relatively good corrosion resistance of stainless steel used for fuel cell bipolar plates, it is difficult to prepare suitable metallographic samples by traditional stainless steel corrosion methods, and there are many deficiencies in the existing stainless steel metallographic etchant and metallographic preparation methods
Chinese patent document CN 109706456A proposes a ferritic stainless steel etchant and metallographic preparation method, but the etchant contains ferric chloride, nitric acid, imidazoline, absolute ethanol and other components, and the method is mainly used in niobium-containing ferrite Stainless steel, and the solution composition and preparation process are more complicated
Chinese patent document CN 102517585A proposes an austenitic stainless steel corrosion solution and metallographic preparation method, but the corrosion solution is composed of hydrochloric acid, glycerin, nitric acid and hydrogen peroxide, the composition of the corrosion solution is relatively complex, and the preparation and corrosion time are relatively long
Chinese patent document CN 107991161A proposes a metallographic etchant and corrosion method for stainless steel, but the method is mainly used to prepare super austenitic stainless steel metallographic samples, and the corrosion solution has a long standing time
Chinese patent document CN107748098A proposes a method for grain boundary corrosion of ultra-thin stainless steel, but the method is mainly applied to austenitic stainless steel, and the corrosion time is long and the efficiency is low

Method used

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  • A kind of stainless steel corrosion agent and metallographic preparation method for fuel cell bipolar plate
  • A kind of stainless steel corrosion agent and metallographic preparation method for fuel cell bipolar plate
  • A kind of stainless steel corrosion agent and metallographic preparation method for fuel cell bipolar plate

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preparation example Construction

[0046] A metallographic preparation method of stainless steel for a fuel cell bipolar plate, using the above-mentioned corrosive agent, comprising the following steps:

[0047] (1) Sample preparation: the fuel cell bipolar plate is sampled, prepared, cleaned and dried with stainless steel;

[0048] (II) Corrosive agent preheating: preheating the corrosive agent, and the preheating temperature is controlled at 40-90°C;

[0049] (III) Corrosion: take the sample and the corrosion-resistant conductive material as anode and cathode respectively, insert them into the preheated etchant, apply a voltage of 1.0-2.0V on both ends of the sample and the corrosion-resistant conductive material, and corrode for 0.5-6min ;

[0050] (IV) Take out the sample, wash and dry it.

[0051] In the sampling process of preferred step (I) among the present invention, adopt shearing machine, cutting machine or wire cutting method to intercept the sample whose side length is greater than or equal to 1c...

Embodiment 1

[0064] (1) Preparation of corrosive agent: preparation of 2.7% H 2 SO 4 +0.5% HF (volume percentage, the same below) deionized water etching solution 500ml;

[0065] (2) Corrosive agent preheating: put the corrosive agent in a constant temperature water bath for preheating, and the preheating temperature is controlled at 80°C;

[0066] (3) Sampling: use a shearing machine to intercept a sample with a side length of 2.5 cm;

[0067] (4) Cleaning and drying: first clean with deionized water, then clean with alcohol, and dry with a hair dryer after cleaning;

[0068] (5) Corrosion: Place the anode and cathode of the stainless steel sample and the corrosion-resistant conductive material in the preheated corrosive agent respectively, apply a voltage of 1.2V, and corrode for 2 minutes;

[0069] (6) Cleaning and drying: first clean with water, then with alcohol, and dry with a hair dryer after cleaning;

[0070] (7) Microscopic observation: the corroded sample was observed under ...

Embodiment 2

[0072] (1) Preparation of corrosive agent: preparation of 2.7% H 2 SO 4 +0.5% HF deionized water etching solution 500ml;

[0073] (2) Corrosive agent preheating: put the corrosive agent in a constant temperature water bath for preheating, and the preheating temperature is controlled at 80°C;

[0074] (3) Sampling: use a shearing machine to intercept a sample with a side length of 2.5 cm;

[0075] (4) Cleaning and drying: first clean with deionized water, then clean with alcohol, and dry with a hair dryer after cleaning;

[0076] (5) Corrosion: Place the anode and cathode of the stainless steel sample and the corrosion-resistant conductive material in the preheated corrosive agent respectively, apply a voltage of 1.2V, and corrode for 4 minutes;

[0077] (6) Cleaning and drying: first clean with water, then with alcohol, and dry with a hair dryer after cleaning;

[0078] (7) Microscopic observation: the corroded sample was observed under a microscope. Surface topography se...

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Abstract

The invention relates to a stainless steel etchant for fuel cell bipolar plates and a metallographic preparation method, which comprises the following components in volume percentage: concentrated sulfuric acid 1.0-5.0%, hydrofluoric acid ≤ 1.0%, and the rest is deionized water; gold The phase preparation method uses the above-mentioned corrosive agent, including the following steps: (I) preparing the sample; (II) preheating the corrosive agent, and the preheating temperature is controlled at 40-90 ° C; (III) using the sample and the corrosion-resistant conductive material as the anode and the corrosion-resistant conductive material respectively. Insert the cathode into the preheated etchant, apply a voltage of 1.0-2.0V to both ends of the sample and the corrosion-resistant conductive material, and corrode for 0.5-6min; (IV) Take out the sample, clean and dry it. Compared with the prior art, the corrosive agent of the present invention has a simple proportion, is easy to prepare, and is safe and environmentally friendly; the corrosive method is easy to operate and has good controllability, and can rapidly prepare stainless steel metallographic samples in batches; the corrosive solution can be reused, and is economical and efficient; The phase structure and grain boundaries are uniform and clear.

Description

technical field [0001] The invention belongs to the technical field of metallographic structure characterization analysis, and in particular relates to a stainless steel corrosive agent for fuel cell bipolar plates and a metallographic preparation method. Background technique [0002] Proton exchange membrane fuel cells are considered to be one of the most important directions for the development of new energy vehicles in the future because of their high power generation efficiency, high power density, low operating noise, wide range of energy sources, no environmental pollution, and low-temperature operation. Among them, the bipolar plate accounts for about 20-30%, 60-80% and 70-90% of the cost, weight and volume of the proton exchange membrane fuel cell, and is one of the key components of the proton exchange membrane fuel cell. Stainless steel bipolar plates have high mechanical strength, gas barrier properties, electrical and thermal conductivity, and are easy to achieve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/28G01N1/28G01N1/32
CPCC23F1/28G01N1/28G01N1/32
Inventor 张存满冷宇明平文杨代军李冰
Owner TONGJI UNIV