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Electrolyte solution used for rapid evaluation of groove corrosion performance

An electrolytic solution and trench corrosion technology, applied in the electrolysis process, electrolysis components, weather resistance/light resistance/corrosion resistance, etc., can solve the problems of random pitting corrosion, inability to obtain measurement results, etc., and achieve simple ingredients, simplified procedures, preparation handy effect

Active Publication Date: 2012-04-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if a water-based electrolyte solution is used, random pitting corrosion will occur on the surface of the welded pipe sample, and correct measurement results cannot be obtained

Method used

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  • Electrolyte solution used for rapid evaluation of groove corrosion performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The ratio of electrolyte solution is: nitric acid: 1ml / 100ml, water (H 2 O): 30ml / 100ml, the rest is ethylene glycol (CH 2 OH-CH 2 OH).

[0024] The concrete flow process that electrolytic solution of the present invention is used for evaluating trench corrosion performance is:

[0025] ① The sampling and sample preparation method on the longitudinal welded pipe is the same as the 144-hour constant potential corrosion test, and the surface of the test sample is finally polished with water sandpaper, such as 1000# water sandpaper.

[0026] ②Sample pretreatment: Degrease with alcohol, blow dry, and set aside.

[0027] ③ Electrolyte solution preparation: use the above-mentioned electrolyte solution.

[0028] ④Put the sample into the electrolytic cell according to the operation experiment method of SVP (scanning vibration probe), adjust the sample level, install the scanning probe, inject the prepared electrolyte solution, so that the surface of the sample and the scann...

Embodiment 2

[0032] The ratio of electrolyte solution is: nitric acid: 0.1ml / 100ml, water (H 2 O): 25ml / 100ml, the rest is ethylene glycol (CH 2 OH-CH 2 OH).

[0033] Others are the same as embodiment 1.

Embodiment 3

[0035] The ratio of electrolyte solution is: nitric acid: 2ml / 100ml, water (H 2 O): 30ml / 100ml, the rest is ethylene glycol (CH 2 OH-CH 2 OH).

[0036] Others are the same as embodiment 1.

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Abstract

The invention provides an electrolyte solution used for rapid evaluation of a groove corrosion performance. The electrolyte solution comprises 0.1-5% by volume of nitric acid, 10-40% by volume of water, and the balance ethylene glycol. The electrolyte solution of the invention has the advantages of simple components and easy preparation, and is suitable for rapid measuring of the groove corrosion performance of a straight welded pipe. The measuring consumes a small amount of the electrolyte solution, and random point corrosion cannot occur. The invention opens up a new approach for measuring the straight welded pipe corrosion performance with electrochemical techniques.

Description

technical field [0001] The invention relates to an electrolytic solution, in particular to an electrolytic solution for rapidly evaluating the groove corrosion performance of straight seam welded pipes. Background technique [0002] In the manufacturing process of longitudinal welded pipe, the local reheating caused by welding makes the weld structure and composition of the welded pipe different from the base metal, resulting in a corrosion rate at the weld that is greater than that of the base metal. In order to evaluate the difference in corrosion rate between the two, the commonly used evaluation method is to measure the corrosion depth of the sample weld and the base metal after 144 hours of constant potential corrosion in NaCl solution, and then calculate the ratio of the corrosion depth of the weld to the base metal corrosion depth , to evaluate the corrosion resistance of straight seam welded pipes. When the weld is consistent with the base metal, the ratio is equal ...

Claims

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Application Information

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IPC IPC(8): C25F7/00G01N17/00
Inventor 胡凡魏军胜
Owner BAOSHAN IRON & STEEL CO LTD