Electrolytic corrosion agent capable of displaying nickel-based corrosion-resistant alloy metallographic structure and corrosion method thereof

A technology of corrosion-resistant alloy and metallographic structure, applied in the field of metallographic electrolytic corrosion, can solve the problems of personal safety and health injury of experimenters, changes in concentration ratio, environmental pollution, etc., and achieve optimized electrolysis time, stable properties, and corrosion effects Good results

Inactive Publication Date: 2015-03-25
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses highly corrosive, volatile, and highly irritating aqua regia, which can easily cause harm to the personal safety and

Method used

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  • Electrolytic corrosion agent capable of displaying nickel-based corrosion-resistant alloy metallographic structure and corrosion method thereof
  • Electrolytic corrosion agent capable of displaying nickel-based corrosion-resistant alloy metallographic structure and corrosion method thereof
  • Electrolytic corrosion agent capable of displaying nickel-based corrosion-resistant alloy metallographic structure and corrosion method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of electrolytic corrosion agent: Weigh 40g of oxalic acid, 180g of glycerin, and 500ml of deionized water. At room temperature, pour oxalic acid, glycerin, and deionized water into a glass container in turn, and stir with a glass rod until the oxalic acid is completely dissolved to obtain the electrolytic corrosion agent. corrosive;

[0023] (2) Polish the nickel-based corrosion-resistant alloy Inconel625 to be corroded with 400#, 600#, 800#, 1000# water-grinding sandpaper, and then mechanically polish it with diamond polishing agent;

[0024] (3) Pour the electrolytic corrosion agent prepared in step (1) into the electrolytic corrosion instrument. The cathode material of the electrolytic corrosion instrument is 304 stainless steel, and the polished nickel-based corrosion-resistant alloy Inconel625 is used as the anode. The electrolytic corrosion DC voltage is 20V and the current is 6.0A, the electrolytic corrosion temperature is room temperature, and th...

Embodiment 2

[0028] (1) Preparation of electrolytic etchant: Weigh 50g of oxalic acid, 150g of glycerin, and 450ml of deionized water. At room temperature, pour oxalic acid, glycerin and deionized water into a glass container in turn, and stir with a glass rod until the oxalic acid is completely dissolved to prepare an electrolytic etchant. .

[0029] (2) Polish the nickel-based corrosion-resistant alloy Inconel625 to be corroded with 400#, 600#, 800#, 1000# water-grinding sandpaper, and then mechanically polish it with diamond polishing agent.

[0030] Pour the electrolytic corrosion agent prepared in step (1) into the electrolytic corrosion instrument. The cathode material of the electrolytic corrosion instrument is 304 stainless steel, and the polished nickel-based corrosion-resistant alloy is used as the anode. The electrolytic corrosion DC voltage is 18V and the current is 5.5A. The corrosion temperature is room temperature, and the electrolytic corrosion time is 20s. After the c...

Embodiment 3

[0033] (1) Preparation of electrolytic etchant: Weigh 60g of oxalic acid, 120g of glycerin, and 400ml of deionized water. At room temperature, pour oxalic acid, glycerin and deionized water into a glass container in turn, and stir with a glass rod until the oxalic acid is completely dissolved to prepare an electrolytic etchant. .

[0034] (2) Polish the nickel-based corrosion-resistant alloy Inconel800 to be corroded with 400#, 600#, 800#, 1000# water-grinding sandpaper, and then mechanically polish it with diamond polishing agent.

[0035] (3) Pour the electrolytic corrosion agent prepared in step (1) into the electrolytic corrosion instrument. The cathode material of the electrolytic corrosion instrument is 304 stainless steel, and the polished nickel-based corrosion-resistant alloy is used as the anode. The electrolytic corrosion DC voltage is 15V and the current is 5.0 A, the electrolytic corrosion temperature is room temperature, and the electrolytic corrosion time is...

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Abstract

The invention discloses an electrolytic corrosion agent capable of displaying a nickel-based corrosion-resistant alloy metallographic structure and a corrosion method thereof and belongs to the technical field of metallographic electrolysis corrosion. The electrolytic corrosion agent comprises 40-60g of oxalic acid, 120-180g of glycerol and 400-500ml of deionized water. The corrosion method comprises the following steps: (1) preparing an electrolytic corrosion agent; (2) grinding a to-be-corroded nickel-based corrosion-resistant alloy by waterproof abrasive paper, then polishing the alloy by using a diamond polishing agent; (3) pouring the electrolytic corrosion agent prepared by the step (1) into an electrolytic corrosion instrument to carry out electrolytic corrosion; and (4) taking a sample out of the corrosion agent, washing the sample by using absolute ethyl alcohol and then airing. The electrolytic corrosion agent is simple in formula, free of toxicity and free of pungent smell; the damage to health of experimenters can be greatly reduced; the electrolytic corrosion agent is hard to volatilize, can be stored for a long time and can be reused, is good in corrosion effect and is capable of clearly displaying the nickel-based corrosion-resistant alloy metallographic structure.

Description

technical field [0001] The invention relates to the technical field of metallographic electrolytic corrosion. Background technique [0002] Nickel-based corrosion-resistant alloys have sufficient nickel content and high chromium content, so that they have good resistance to stress corrosion cracking under aqueous corrosion conditions. The high chromium content gives it better resistance to pitting and crevice corrosion cracking. The alloy has good corrosion resistance to nitric acid and organic acid. It also has good corrosion resistance in oxidizing and non-oxidizing salts. Because of its good corrosion resistance, it is widely used in industry. [0003] However, due to the good corrosion resistance of nickel-based corrosion-resistant alloys, the metallographic structure cannot be revealed by ordinary corrosion solutions. The currently available corrosion method is to use aqua regia glycerin solution for electrolytic corrosion. This method uses highly corrosive, volati...

Claims

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Application Information

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IPC IPC(8): C25F3/02G01N1/32
Inventor 崔会杰史远薛峰胡加佳刘艳丽
Owner HEBEI IRON AND STEEL
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