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Hot acid electrolytic corrosion method for macroscopic examination of metal samples

A technology of electrolytic corrosion and low-magnification inspection, applied in the preparation of test samples, etc., can solve the problems of difficult inspection of white spot defects of wheel products, limited ability of reaction product ions to evacuate outward, limited ability of passive film formation, etc.

Active Publication Date: 2009-09-23
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the directional flow of electrons in direct current, the ability to evacuate the reaction product ions is limited, that is, the ability to overcome the formation of a passivation film that hinders the corrosion process is limited, resulting in a reduced corrosion effect on the sample, poor corrosion effect, and even some Defects are difficult to show, and white spot defects in wheel products are not easy to detect, and the inspection cycle of this method is also longer

Method used

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  • Hot acid electrolytic corrosion method for macroscopic examination of metal samples
  • Hot acid electrolytic corrosion method for macroscopic examination of metal samples

Examples

Experimental program
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Effect test

Embodiment 1

[0015] For relatively dense materials such as wheel steel, the hot acid electrolytic corrosion method is as follows:

[0016] Add 15%-30% (volume ratio) industrial hydrochloric acid aqueous solution into the low-power pickling tank, heat the acid solution from room temperature to 40°C-45°C, turn off the power, then place the sample, and turn on the power for 18-25 minutes After power off, take out the sample, wash it with 3%-5% sodium carbonate aqueous solution and hot water and dry it, and the sample can be rated. Compared with the hot acid method, the inspection cycle is shortened by 60 minutes, and the initial acid temperature is reduced by 15-40°C.

Embodiment 2

[0018] The hot acid electrolytic corrosion method for ordinary carbon structural steel and other materials is as follows:

[0019] Add 15%-30% (volume ratio) industrial hydrochloric acid aqueous solution into the low-power pickling tank, heat the acid solution from room temperature to 40°C-45°C, turn off the power, then place the sample, and turn off the power after 15 minutes Electricity, take out the sample, brush with 3%-5% sodium carbonate aqueous solution and hot water and dry it, the sample can be rated. Compared with the hot acid method, the inspection period is shortened by 65 minutes, and the initial acid temperature is reduced by 15-40°C.

Embodiment 3

[0021] The hot acid electrolytic corrosion method for alloy steel is as follows:

[0022] Add 15%-30% (volume ratio) industrial hydrochloric acid aqueous solution into the low-power pickling tank, heat the acid solution from room temperature to 40°C-45°C, turn off the power, then place the sample, and turn on the power for 15-20 minutes After power off, take out the sample, wash it with 3%-5% sodium carbonate aqueous solution and hot water and dry it, and the sample can be rated. Compared with the hot acid method, the inspection period is shortened by 65 minutes, and the initial acid temperature is reduced by 15-40°C.

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Abstract

The invention discloses a hot acid electrolytic corrosion method for macroscopic examination of metal samples, which is characterized in that 15-30 percent of industrial hydrochloric acid solution is added to a macroscopic examination pickling tank; the hydrochloric acid solution is energized and heated and deenergized until the temperature is increased to 40-45 DEG C; the samples stand, is energized for electrolytic corrosion for 15-25min by alternate current and is deenergized; the samples are taken out, washed by 3-5 percent of sodium carbonate solution and hot water and dried by blowing.

Description

technical field [0001] The invention relates to an inspection method for low-magnification inspection of metal samples. Background technique [0002] At present, the inspection methods used for low-magnification inspection include hot acid corrosion method and electrolytic corrosion method. The hot acid corrosion method (referred to as the hot acid method) is to increase the temperature of the acid solution to increase the movement speed of various ions in the acid solution, so that the reaction product ions are evacuated outward, and overcome the formation of a passive film that hinders the corrosion process. However, as the acid temperature increases, the volatility of the acid increases, causing serious environmental pollution, and reducing the acid temperature will inevitably prolong the corrosion time, resulting in a too long inspection period. The main disadvantages of this method are that the inspection period is long, the acid concentration is high, it is extremely ...

Claims

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Application Information

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IPC IPC(8): G01N1/32C25F3/02
Inventor 王越陈联满杨峥任祥赵志海
Owner MAANSHAN IRON & STEEL CO LTD
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