Pickling solution and application of weight loss analysis to detect corrosion of metal materials

A technology of metal materials and pickling liquid, which is applied in the direction of removing certain components and weighing, can solve the problems of disproportionation reaction of monovalent copper ions, affect the accuracy of weight loss analysis, and troublesome use of washing liquid, so as to reduce disproportionation Reaction, reduced substrate loss, weak cleaning effect

Active Publication Date: 2019-05-07
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The recommended pickling solution mainly has the following problems in use: first, the use process of some washing solutions is troublesome, such as the hydrochloric acid washing solution recommended in the national standard, which needs to be carried out under the condition that the solution is passed through nitrogen to remove oxygen; secondly, The acidity of the recommended pickling solution is relatively high, and problems such as serious loss of metal substrate and disproportionation reaction of monovalent copper ions will inevitably occur during the cleaning process, which will affect the accuracy of weight loss analysis; finally, the different cleaning solutions recommended by the national standard There are differences in weight loss results when used, resulting in poor comparability when analyzing the results of different experiments

Method used

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  • Pickling solution and application of weight loss analysis to detect corrosion of metal materials
  • Pickling solution and application of weight loss analysis to detect corrosion of metal materials
  • Pickling solution and application of weight loss analysis to detect corrosion of metal materials

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The pickling solution for weight loss analysis and detection of corrosion of metal materials is: Measure 10 ml of concentrated hydrochloric acid and 100 ml of water, pour them into a 250 ml beaker, and stir evenly with a glass rod. Weigh 40 grams of hexamethylenetetramine, add it into the mixed hydrochloric acid and water mixture, and stir with a glass rod until the hexamethylenetetramine is completely dissolved. Use a calibrated pH meter to measure the pH value of the pickling solution, and the average value of the three measured pH values ​​is 5.41.

[0024] The pickling solution obtained above was used for weight loss analysis and detection. Prepare 200 ml of tap water, 200 ml of deionized water and 50 ml of absolute ethanol for cleaning the pickled sample. Put the pure copper strip rust sample with a size of 50×10×1mm into the prepared pickling solution, put the beaker containing the pickling solution into the ultrasonic instrument, turn on the ultrasonic, and time...

Embodiment 2

[0027] Take 5 pieces of parallel pure copper strip rust samples with a size of 50×10×1 mm, and use the hydrochloric acid-hexamethylenetetramine-water pickling solution used in Example 1 to perform circular cleaning again. Wherein, the cleaning process is the same as in Example 1, and the weight loss data processing is also the same as in Example 1, and it can be seen from the data that the cleaning solution reduces the problem of low weight loss data caused by the disproportionation of monovalent copper ions, and the sample is accurately obtained. Corrosion weight loss data, while ensuring a small metal substrate loss.

[0028] After completing embodiment 1, the pH value of the pickling solution was measured to be 5.41, which was the same as before the pickling solution was used. Table 1 lists the weight loss mass (mass of cuprous oxide) of each parallel test piece calculated after repeated use of the pickling solution to clean the parallel test pieces and the pH value of the ...

Embodiment 3

[0032] The pickling solution for weight loss analysis and detection of corrosion of metal materials is: Measure 10 ml of concentrated hydrochloric acid and 100 ml of water, pour them into a 250 ml beaker, and stir evenly with a glass rod. Weigh 20 grams of hexamethylenetetramine, add it into the mixed hydrochloric acid and water mixture, and stir with a glass rod until the hexamethylenetetramine is completely dissolved. Use a calibrated pH meter to measure the pH value of the pickling solution, and the average value of the three measured pH values ​​is 4.48.

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Abstract

The invention belongs to the field of application of a weightlessness method in the field of metal material corrosion, in particular to a pickling solution for detecting corrosive substances in a metal material through weightlessness analysis and an application. The pickling solution contains concentrated hydrochloric acid, deionized water and hexamethylene tetramine in a volume-mass (ml / g) ratio being 5:100:9-80, wherein pH of the pickling solution is controlled to be 4.15-6.15. With the adoption of the method, accurate weightlessness data of copper corrosion products can be obtained, and loss of base metal is reduced. Meanwhile, a specified experimental process can guarantee comparability of data of different experiments.

Description

technical field [0001] The invention belongs to the application field of a weight loss method in the field of metal material corrosion, and in particular relates to a pickling solution for weight loss analysis and detection of metal material corrosion and its application. Background technique [0002] Copper and its alloys are metal materials closely related to human activities. Because of its good electrical and thermal conductivity, stable chemical properties, and good ductility and plasticity, copper and its alloys are widely used in many fields such as the electrical industry, electronics industry, transportation industry, energy industry, and marine industry. In the consumption of non-ferrous metals in my country, the consumption of copper is second only to aluminum. In the application of metallic materials, corrosion problems inevitably arise. Especially in the environment with many corrosion factors, the corrosion problem of copper and its alloys is particularly ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06C23G1/10G01N5/04
CPCC23G1/063C23G1/103G01N5/04
Inventor 陈卓元刘星辰李坤孙晓英李亨特荆江平孙萌萌
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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