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Corrosive liquid for 300M metallographic analysis and corrosion method

A technology of metallographic analysis and corrosion solution, which is applied in the field of aerospace and can solve problems such as inability to corrode grain boundaries

Active Publication Date: 2015-04-15
CHINA ERZHONG GRP DEYANG HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems existing in the prior art, the object of the present invention is to provide a corrosion method for 300M steel etc. which cannot corrode the grain boundary with the prior art, so as to solve the problems existing in the metallographic analysis of these steels

Method used

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  • Corrosive liquid for 300M metallographic analysis and corrosion method
  • Corrosive liquid for 300M metallographic analysis and corrosion method
  • Corrosive liquid for 300M metallographic analysis and corrosion method

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Corrosive solution configuration

[0053] Use 15ml of analytically pure nitric acid with a concentration of 67%, add it to 80ml of distilled water, take 10ml of this solution and add it to 75ml of picric acid saturated aqueous solution to obtain component A of the corrosion solution; use 6ml of analytically pure hydrochloric acid with a concentration of 36%, add it to In 100ml of distilled water, take 6ml of the solution and add it to 100ml of picric acid saturated ethanol solution to obtain component B of the corrosion solution;

[0054] Mix evenly according to the following weight ratio:

[0055] 25g of corrosion solution component A; 70g of corrosion solution component B; 4g of diethyl ether, 2g of 2, 4, 6-trinitroquinone; 0.1g of dodecyltrimethylammonium chloride.

[0056] Then, the samples of 300M steel etc. were ground, polished, cleaned and dried according to the procedures of metallographic analysis, and then immersed in the corrosive solution at about 16°C, co...

Embodiment 2～6

[0058] The method of configuring the etching solution and the etching process are similar to those in Example 1. See Table 1 for details.

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Abstract

The invention relates to a corrosive liquid for 300M metallographic analysis and a corrosion method, belongs to the technical field of aerospace engineering, and aims at solving the problem that steel exists in metallographic analysis as the crystal boundary of a steel type of 300M steel cannot be corroded in the prior art. The corrosive liquid is prepared from the flowing components in parts by weight: 25-50 parts of a corrosive liquid component A, 43-70 parts of a corrosive liquid component, 2-11 parts of a corrosion speed adjusting agent, 3-6 parts of 1,4,6-trinitro-resorcinol and 0.1-1.5 parts of a cation surfactant, wherein the corrosion speed adjusting agent is an ether substance; the corrosive liquid component A is a picric acid saturated water solution with 0.5-2wt% of HNO3; and the corrosive liquid component B is a picric acid saturated alcohol solution with 0.1-6wt% of HCl. By utilizing the corrosive liquid and the corrosion method, the crystal boundary of the 300M steel can be clearly corroded by using ordinary materials in an economic mode under less strict condition.

Description

technical field [0001] The invention relates to a 300M steel metallographic analysis corrosion solution and a corrosion method, which belong to the technical field of aerospace. Background technique [0002] 300M steel is a medium-low-carbon ultra-high-strength alloy steel widely used in domestic and foreign aviation fields. It is widely used in the landing gear systems of various large and modern aircraft and the latest fighter jets, such as the J-10 fighter jet independently developed by China. The landing gear of the latest J-20, Boeing-787 and Airbus-380 produced by Boeing and Airbus are all made of 300M steel. Over the years, many scholars have conducted more comprehensive research on the structure and performance of 300M steel. The high-strength steel 300M used in the United States is a modification of AISI4340 steel. The improved steel can delay the first type of temper brittleness and improve Tempering temperature, which is conducive to eliminating internal stress a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/28G01N1/32
Inventor 白敏陈晓慈赵军孙承才王月乔曹泉波
Owner CHINA ERZHONG GRP DEYANG HEAVY IND
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