Loading method and application of a metal surface corrosion inhibitor

A metal surface, corrosion inhibitor technology, applied in anodizing and other directions, can solve the problems of limited corrosion inhibitor dose, insignificant corrosion inhibition effect, difficulty in ensuring doping uniformity, etc., and achieve the effect of high loading

Active Publication Date: 2011-12-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above method, the corrosion inhibitor is directly doped into the protective layer. On the one hand, it is difficult to ensure the uniformity of doping; on the other hand, the amount of the doped corrosion inhibitor is limited, and the corrosion inhibition effect provided is not good. obvious

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  • Loading method and application of a metal surface corrosion inhibitor
  • Loading method and application of a metal surface corrosion inhibitor
  • Loading method and application of a metal surface corrosion inhibitor

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The 2024 aluminum alloy electrode sheet is subjected to electrostatic sanding of No. 80, 120, and 400 in turn, and mechanically polished with No. 14 metallographic sandpaper. It is placed in a 60°C degreasing solution for 5 minutes, and then ultrasonicated at 60°C for 10 minutes. Finally, tap water is used sequentially. After cleaning the electrode with deionized water, quickly dry it with hot air, and place it in a dry box for 24 hours before use.

[0035] Add 50mL of absolute ethanol, 50mL of water, 3mL of tetraethyl orthosilicate (TEOS) to the beaker in turn, adjust the pH to about 3.0 with HCl, stir at room temperature for 2~3h and set aside. Add the prepared precursor solution into the three-electrode tank, use the 2024 aluminum alloy electrode as the working electrode, Ag / AgCl as the reference electrode, platinum as the counter electrode, control the potential at -1.5V, and set the deposition time to 300s. After rinsing with deionized water, dry at 40°C to obtain a ...

Embodiment 2

[0041] The specific implementation steps are as in Example 1, the subsequent protective layer is changed, and the DTMS silane film is replaced with an epoxy coating. The ratio of the epoxy coating solution is: the mass ratio of epoxy resin, polyamide resin, solvent (n-butanol:xylene volume ratio = 3:7) = 5:4:8. Brush the epoxy solution on the pretreated aluminum alloy substrate, and place it at 40°C for one week to cure. The thickness of the resulting coating is about 40±2 μm.

[0042] In addition to using electrochemical impedance spectroscopy (EIS) technology for testing, the test solution used is 3.5wt% NaCl aqueous solution, and the evaluation of the coating also adopts the accelerated test method, that is, boiling water immersion test: the metal / coating system is placed After 8 hours in boiling deionized water, stop boiling, take out the sample, and observe the foaming and delamination of the coating. Table 2 lists the low-frequency impedance modulus and boiling water t...

Embodiment 3

[0047] The specific implementation steps are as in Example 1, changing the substrate to low-carbon steel. The difference is that the low-carbon steel substrate does not need to be sanded, and the degreasing step is directly performed. In addition, the corrosion inhibitor was changed from BTA to thiourea suitable for steel. In addition to the evaluation of the protective layer by electrochemical impedance spectroscopy, damp heat experiments are also used for accelerated evaluation. The latter is carried out in a constant temperature and humidity chamber with a controlled temperature of 40°C and a humidity of 90%, and the corrosion status of the sample surface is regularly observed. The specific test results are listed in Table 3.

[0048] Table 3 Low-frequency impedance modulus and damp heat test results of different low-carbon steel / DTMS protective layer systems

[0049] sample |Z| / Ω·cm 2 (f=0.1Hz) Red rust time in damp heat test / h Bare mild steel subst...

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Abstract

The invention discloses a loading method and application of a metal surface corrosion inhibitor. The loading method comprises the following steps of: depositing a layer of inert and porous nano oxide film on a metal matrix; performing saturation adsorption of a corrosion inhibitor through impregnation; and covering a protective layer on the surface. The nano oxide film is prepared by depositing an aqueous solution of precursor such as SiO2, TiO2 or ZrO2 on the metal surface through an electro-deposition method. The corrosion inhibitor adsorbed on the nano oxide film is determined by the type of the metal matrix. The protective layer for covering can be a common organic silane film, an inorganic/organic hybridized silane film or a common organic coating. The loading method for the metal surface corrosion inhibitor is used for protecting metals. A preparation process is simple, and the cost is low. When the matrix is corroded, the nano oxide film can release the corrosion inhibitor to protect the matrix; and compared with a mode that the corrosion inhibitor is directly absorbed on the surface of the metal matrix, the nano oxide layer can load more corrosion inhibitor to better protect the metal matrix.

Description

technical field [0001] The invention relates to a metal protection method, in particular to a loading method and application of a metal surface corrosion inhibitor. Background technique [0002] As we all know, in nature, except for a small amount of precious inert metals (gold, platinum, etc.), most of the other metals and their alloys are prone to corrosion under natural conditions, and they are generally protected before use to improve their corrosion resistance. performance and prolong service life. At present, the most commonly used metal protection method in the industry is to coat protective films, such as organic polymer coatings and silane films that have emerged in recent years. In order to further prolong the protective effect of the above-mentioned film layer, a metal corrosion inhibitor is often added to the protective layer. For example, Vignesh Palanivel (Progress in Organic Coatings, 2005, 53 (2), pp 153-168) found that after adding corrosion inhibitors ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/02C23F11/00
Inventor 胡吉明王钾张鉴清曹楚南
Owner ZHEJIANG UNIV
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