Stainless steel corrosive for fuel cell bipolar plate and metallographic phase preparation method

A fuel cell and bipolar plate technology, applied in the preparation of test samples, etc., can solve the problems of complex solution composition and preparation process, long standing time of corrosion solution, and difficulty in preparing metallographic samples, etc., to achieve metallographic structure Uniform and clear, less harmful, easy to prepare effect

Active Publication Date: 2020-05-12
TONGJI UNIV
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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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  • Stainless steel corrosive for fuel cell bipolar plate and metallographic phase preparation method
  • Stainless steel corrosive for fuel cell bipolar plate and metallographic phase preparation method
  • Stainless steel corrosive for fuel cell bipolar plate and metallographic phase preparation method

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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 corrosive for a fuel cell bipolar plate and a metallographic phase preparation method. The stainless steel corrosive comprises the following components in percentage by volume: 1.0-5.0% of concentrated sulfuric acid, equal to or less than 1.0% of hydrofluoric acid and the balance of deionized water. The metallographic phase preparation method adopts the corrosive and comprises the following steps: 1, preparing a sample; 2, preheating the corrosive at the temperature of 40-90 DEG C; 3, taking the sample and corrosion resistant conductive material as the anode and the cathode separately, inserting the anode and the cathode in the preheated corrosive, applying 1.0-2.0 V of voltage at the two ends of the sample and the corrosion resistant conductive material, and carrying out corrosion for 0.5-6 minutes; and 4, taking the sample out, and washing and drying the sample. Compared with the prior art, the corrosive is simple in matching, easy to prepare, safe and environmentally-friendly; the corrosive method is easy to operate and excellent in controllability, a stainless steel metallographic phase sample can be rapidly prepared on batches, the corrosive liquid can be repeatedly used and is economical and efficient; and the metallographic structure and grain boundary 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 Applications(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
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