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Preparation method of anticorrosive film for metal surface

A technology of metal surface and corrosion film, which is applied to the device and coating of the surface coating liquid, can solve the problems of damage to the mechanical properties of the metal, hidden dangers in the anti-corrosion process, difficult to control the etching process, etc., and achieve good anti-corrosion performance. , The effect of strong adhesion and high protection efficiency

Inactive Publication Date: 2010-03-03
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the adsorption of thiol films on copper surfaces with a face-centered cubic structure was first performed using 7 mol / L of HNO 3 The aqueous solution is etched for 10-15s. For iron with a body-centered cubic structure that is more difficult to adsorb, the cathode current density is 1.0mA·cm during the electrification process. -2 case, use HClO 4 Etching with an aqueous solution for 10 minutes produces a more active surface so that the anti-corrosion film can be adsorbed on the surface, but this method seriously damages the mechanical properties of the metal, leaving hidden dangers for the future anti-corrosion process, and the etching process is difficult. control

Method used

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  • Preparation method of anticorrosive film for metal surface
  • Preparation method of anticorrosive film for metal surface
  • Preparation method of anticorrosive film for metal surface

Examples

Experimental program
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Effect test

Embodiment 1

[0016] First prepare 10ml of tris(hydroxymethyl)aminomethane hydrochloride (Tris-HCl) aqueous solution with a concentration of 10 mmol / L, adjust the pH to 8.5 with NaOH, and then put DA into the above aqueous solution at a ratio of 2g / L , stirred for 30 minutes, then immersed the polished copper substrate vertically, took it out after 24 hours of contact, rinsed with deionized water, formed a polyDA film layer on the surface of the copper substrate, dried it with nitrogen, and put it into the nitrogen bubbling concentration. 10 mmol / L of 20ml n-dodecanethiol in dichloromethane solution, 25°C water bath, take out after 24h, wash with dichloromethane, and dry with nitrogen, thus forming an anti-corrosion film on the surface of the copper electrode. Such as figure 1 As shown, the polyDA film layer contains carbon, nitrogen, and oxygen elements, and the peaks of carbon elements are at 284.7eV and 286.1eV, which correspond to C-C / C-H and C-N / C-O bonds respectively. This is mainly b...

Embodiment 2

[0023] First configure the concentration of 5 mmol / L phosphate (Na 2 HPO 4 or KH 2 PO 4 ) aqueous solution 10ml, adjust the pH to 9 with NaOH, then put DA into the above aqueous solution at a ratio of 0.2g / L, stir for 20min, then immerse the polished 304 stainless steel substrate vertically, take it out after contacting for 60h, and use deionized water Rinse, dry with nitrogen, put into 20ml of 11-mercapto-1-undecanoic acid (MUA) dichloromethane solution with a concentration of 1 mmol / L bubbled by nitrogen, take it out after 48 hours in a water bath at 20°C, and use di Washing with methyl chloride and drying with nitrogen gas formed an anti-corrosion film on the surface of the 304 stainless steel electrode. Figure 4 The AC impedance diagram (Nyquist diagram) of DA and MUA-treated and untreated 304 stainless steel electrodes respectively immersed in sterilized seawater, curve 1 in the figure corresponds to the blank 304 stainless steel substrate, curve 2 corresponds to the ...

Embodiment 3

[0025] First prepare 10 ml of an aqueous solution of tris (hydroxymethyl) aminomethane hydrochloride (Tris-HCl) with a concentration of 10 mmol / L, adjust the pH to 8 with NaOH, and then put DA into the above aqueous solution at a ratio of 1 g / L , stirred for 40 minutes, then immersed the polished copper-nickel alloy substrate vertically, took it out after 48 hours of contact, washed it with deionized water, dried it with nitrogen gas, and put it into 20 ml of MUA with a concentration of 2 mmol / L bubbled by nitrogen gas. Dichloromethane solution, 30 ° C water bath, take it out after 24 hours, wash with dichloromethane, and dry with nitrogen, thus forming an anti-corrosion film on the surface of the copper-nickel alloy electrode. Figure 5The polarization curves of DA and MUA-treated and untreated copper-nickel alloy electrodes respectively immersed in sterilized seawater, curve 1 in the figure corresponds to the blank copper-nickel alloy substrate, curve 2 corresponds to the pol...

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Abstract

The invention discloses a preparation method of a anticorrosive film for metal surface, which is characterized by comprising the following steps: dissolving dopamine in a aqueous solution of tris(hydroxymethyl)aminomethane hydrochloride or phosphate, stirring, dipping metal, contacting for 12-90 h and then taking out, flushing by deionized water, drying by nitrogen and then putting in a solution containing alkane thiol, carrying out water bathing at 20-30 DEG C for 24-48 h and then taking out, flushing by the solution containing the alkane thiol, drying by the nitrogen, and then forming an anticorrosive film on the surface of the metal. By adopting the method, a stable anticorrosive film layer can be formed on a metal substrate with strong cohesion; the preparation method does not need long reaction time and does not need to etch the metal; and the prepared metal surface anticorrosive film has good anticorrosive performance and high protection efficiency as high as 99%.

Description

technical field [0001] The invention relates to a method for preparing a stable and strong anti-corrosion film on a metal surface. Background technique [0002] Metal corrosion is a thermodynamic spontaneous process in which the metal reacts with the corrosive medium in a corrosive environment to make the metal oxidized. According to reports, the annual economic loss caused by metal corrosion accounts for 1.5-2.4% of the gross national product. Therefore, the corrosion and protection of metals are related to the sustainable development of the entire national economy, people's livelihood and economy. In order to reduce the loss caused by corrosion to a minimum, the metal surface treatment method is the most widely used and most effective measure at present. Mercaptan has a good anti-corrosion effect due to its long alkane chain and is widely used. to prevent metal corrosion. [0003] Petrovic and Hukovic (2008) studied the ability of n-alkane thiols with carbon number 12 a...

Claims

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Application Information

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IPC IPC(8): B05D7/24
Inventor 陈守刚陈艳类延华刘云平
Owner OCEAN UNIV OF CHINA
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