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Pure aluminum grain size corrosive agent as well as preparation method and corrosion showing method thereof

A technology of corrosion appearance and grain size, which is applied in particle size analysis, preparation of test samples, particle and sedimentation analysis, etc. It can solve the problems of poor corrosion effect and inconvenient operation, and achieve low cost, easy operation and high work efficiency. high effect

Active Publication Date: 2017-03-15
HENAN PINGZHI HIGH VOLTAGE SWITCHGEAR +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a pure aluminum grain size etchant suitable for the high-voltage electrical appliance industry, so as to solve the problem of poor corrosion effect or inconvenient operation of the existing etchant

Method used

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  • Pure aluminum grain size corrosive agent as well as preparation method and corrosion showing method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] The pure aluminum grain size etchant of the present embodiment consists of the following components: K 2 CrO 4 6g, nitric acid 8ml, picric acid saturated aqueous solution 1ml, hydrofluoric acid 0.5ml, hydrochloric acid 6ml, water 20.5ml.

[0028] The preparation method of the pure aluminum grain size etchant of the present embodiment comprises the following steps:

[0029] 1) Measure 0.5ml of hydrofluoric acid, 6ml of hydrochloric acid, 3ml of nitric acid, and 0.5ml of distilled water in a beaker, stir for 30s to make solution A; weigh 6g of K 2 CrO 4 Put it into a plastic beaker, measure 5ml of nitric acid and pour it into the plastic beaker, stir until dissolved, then add 1ml of picric acid saturated aqueous solution and 20ml of distilled water and mix evenly to obtain solution B;

[0030] 2) Mix solution A and solution B evenly to obtain.

[0031] The corrosion visualization method of this embodiment includes the following steps:

[0032] 1) Cut a 20*20mm pure ...

Embodiment 2

[0037] The pure aluminum grain size etchant of the present embodiment consists of the following components: K 2 CrO 4 5g, nitric acid 10ml, picric acid saturated aqueous solution 1ml, hydrofluoric acid 0.4ml, hydrochloric acid 8ml, water 22ml.

[0038] The preparation method of the pure aluminum grain size etchant of this embodiment is the same as that of Embodiment 1.

Embodiment 3

[0040] The pure aluminum grain size etchant of the present embodiment consists of the following components: K 2 CrO 4 7g, nitric acid 6ml, picric acid saturated aqueous solution 1ml, hydrofluoric acid 0.6ml, hydrochloric acid 4ml, water 18ml.

[0041] The preparation method of the pure aluminum grain size etchant of this embodiment is the same as that of Embodiment 1.

[0042] Using the pure aluminum grain size etchant in Example 2 and Example 3, and using the same corrosion development method as in Example 1 to treat the pure aluminum sample, a corrosion effect map with comparable effect can be obtained.

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Abstract

The invention relates to a pure aluminum grain size corrosive agent as well as a preparation method and a corrosion showing method thereof. The pure aluminum grain size corrosive agent consists of the following components: 5 to 7 g of K2CrO4, 6 to 10 ml of nitric acid, 1ml of a saturated picric acid water solution, 0.4 to 0.6 ml of hydrofluoric acid, 4 to 8 ml of hydrochloric acid and 18 to 22 ml of water. A pure aluminum matrix is a simplex alpha solid solution, different phases exist in the alpha solid solution, and a grain boundary is generated after corrosion; after adopting an existing corrosive agent and an existing corrosion method, a pure aluminum crystal boundary difficultly has obvious level differences and is poor in corrosion effect. The pure aluminum grain size corrosive agent provided by the invention is formed by compounding the nitric acid, the hydrofluoric acid, the hydrochloric acid, potassium chromate and picric acid; and with a suitable concentration, the K2CrO4 can simultaneously play the effects of an oxidant and a mordant, can corrode the crystal boundary, can also colorize alpha grains of different phases and can make the crystal boundary be more obvious and clear in cooperation with the effect of the picric acid.

Description

technical field [0001] The invention belongs to the technical field of physical and chemical inspection of pure aluminum materials, and in particular relates to a pure aluminum grain size etchant, a preparation method thereof, and a corrosion display method. Background technique [0002] In the insulation mechanism of high-voltage electrical engineering, the electric field is mostly uneven. If the local electric field is very strong, partial discharge or even breakdown will occur at a not too high voltage. Therefore, measures need to be taken to improve the electric field distribution and reduce the local Excessive field strength increases the overall dielectric strength of the insulation structure, and the use of special structural parts such as shields, shields, and voltage equalizing rings in the insulation mechanism is the most effective measure to improve this phenomenon. [0003] Pure aluminum has excellent forming and processing characteristics, high corrosion resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/20G01N1/32G01N15/02
CPCC23F1/20G01N1/32G01N15/02
Inventor 马晓红段冲刘喜孙明道肖鹤旋张田甜王晓生
Owner HENAN PINGZHI HIGH VOLTAGE SWITCHGEAR
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