A detection method for Al3+ ion produced by early corrosion of aluminum alloy

A detection method and technology of aluminum alloy, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problems of inability to detect the corrosion process and the exact location of corrosion, expensive instruments, and inconvenient to use, etc. High sensitivity, good linear correlation, the effect of prolonging the service life

Active Publication Date: 2018-04-06
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Traditional corrosion weight loss method, electrochemical method, optical fiber sensor method, plasma chromatography and other methods are used to monitor the corrosion of aluminum alloys, but these methods cannot detect the corrosion process and the exact location of corrosion due to their own limitations. The instruments used Expensive, not easy to use

Method used

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  • A detection method for Al3+ ion produced by early corrosion of aluminum alloy
  • A detection method for Al3+ ion produced by early corrosion of aluminum alloy
  • A detection method for Al3+ ion produced by early corrosion of aluminum alloy

Examples

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Effect test

Embodiment 1

[0044] Fluorescence detection of aluminum alloy corrosion process:

[0045] Polish the cut 5052 aluminum alloy sample step by step with metallographic sandpaper, scrub the surface with alcohol, rinse with deionized water, and blow dry to obtain the aluminum alloy hanging piece, soak the aluminum alloy hanging piece in 200mL containing 0.1g / L quina In the 1wt% NaCl solution of pepicolic acid, pipette 1mL of the corrosion solution into the quartz dish every 12h, and measure the fluorescence spectrum on the RF-5301PC fluorescence spectrometer. see results figure 2 with image 3 .

[0046] from figure 2 , 3 It can be seen that the fluorescence intensity of the solution increases gradually with the prolongation of the soaking time of the coupon. Aluminum alloys containing Cl - Pitting corrosion is extremely prone to occur in the environment, which is due to the Cl in the environment - Uneven adsorption on the passivation film on the aluminum alloy surface leads to uneven c...

Embodiment 2

[0048] Morphological observation of aluminum alloy corrosion process:

[0049] Soak the cut 3cm×5cm×2mm 5052 aluminum alloy sample in 200mL of 1wt% NaCl aqueous solution containing 0.1g / L quinaldicic acid, take it out at regular intervals, and observe it under a stereofluorescence microscope. Corrosion morphology, see the results Figure 5 with Image 6 .

[0050] Such as Figure 5 As shown, before soaking, there were no fluorescent spots on the surface of the coupon; after soaking for 12 hours, small green fluorescent spots began to appear on the surface (due to the black and white drawings, the actual green fluorescent effect cannot be seen in the figure), which shows that the corrosion The oxide film on the surface of the aluminum alloy coupons in the liquid is in the Cl - Under corrosion, the aluminum alloy coupons are cracked, and the aluminum alloy coupons are pitted. At this time, the cracking and repair of the passivation film are carried out at the same time, and ...

Embodiment 3

[0053] Inductively Coupled Plasma Emission Spectroscopy Detection

[0054] Three pieces of AA5052 aluminum alloys of 3cm×5cm×2mm were polished step by step to the mirror surface with 400, 800 and 1200 mesh metallographic sandpaper, degreased with ethanol, rinsed with deionized water, dried with cold wind, soaked in 200mL containing 0.1g / L quinolone Soak in 1wt% NaCl aqueous solution of nacidic acid for 0h, 12h, 24h, 36h respectively. The experimental temperature was 25°C. After the solution is cooled to room temperature, take 100ml of the supernatant to a 100ml volumetric flask, shake it up and test it. The results are shown in Table 1.

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Abstract

The invention relates to a method for detecting Al3<+> ions generated during early corrosion of an aluminum alloy. The to-be-detected aluminum alloy is placed into quinaldine acid aqueous solution, quinaldine acid molecules and Al3<+> form a chelate to enhance the fluorescence intensity of the solution, the fluorescence spectrum is detected by a fluorescence spectrometer to obtain the Al3<+> ion amount generated by aluminum alloy corrosion, and the corrosion degree of the aluminum alloy is predicated. Compared with the prior art, the method has the advantages of simple and feasible operation and high sensitivity; the method is suitable for early corrosion detection of the aluminum alloy and is worth of being popularized and utilized. Due to the fact that quinaldine acid serves as a fluorescent probe, the early corrosion state of the aluminum alloy in a using process is conveniently and quickly monitored and detected, and a remedial measure is timely taken. The service life of the aluminum alloy is prolonged.

Description

technical field [0001] The invention belongs to the field of metal corrosion monitoring, in particular to a kind of Al alloy produced by early corrosion 3+ ion detection method. Background technique [0002] Aluminum alloys are widely used in aerospace, transportation and other fields due to their advantages such as light weight, high specific strength, good thermal conductivity, easy forming, and low price. Aluminum alloys exposed to the humid ocean climate and the rainy season in the south for a long time are extremely prone to corrosion. Therefore, in the early stage of aluminum alloy corrosion, the occurrence of corrosion can be detected in time, and certain protective measures can be taken to effectively prolong the use of equipment. life and avoid unnecessary economic losses. Generally, under natural conditions, an oxide film will form on the surface of aluminum alloys, which can prevent corrosion of aluminum alloys to a certain extent, but this oxide film is easily ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00
Inventor 高立新刘洁李康张大全
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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