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Corrosion resistant hydrotalcite/polyelectrolyte composite film and preparation method thereof

A technology of polyelectrolyte and corrosion resistance, which is applied in the field of corrosion inhibitor intercalated hydrotalcite/polyelectrolytic composite film and its preparation, can solve the problems of poor toughness, insufficient density of the film, and short anti-corrosion life, and achieve uniform and dense film formation , strong binding force and mild preparation conditions

Inactive Publication Date: 2009-09-02
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of corrosion-resistant hydrotalcite / polyelectrolyte composite film and its preparation method, and corrosion inhibitor intercalation hydrotalcite and polyelectrolyte spin-coating are assembled into film, has overcome pure hydrotalcite film not dense enough, toughness Poor, short anti-corrosion life defects

Method used

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  • Corrosion resistant hydrotalcite/polyelectrolyte composite film and preparation method thereof
  • Corrosion resistant hydrotalcite/polyelectrolyte composite film and preparation method thereof
  • Corrosion resistant hydrotalcite/polyelectrolyte composite film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Weigh 28.56g Zn(NO 3 ) 2 ·6H 2 O and 9.00g Al(NO 3 ) 3 9H 2 O dissolved in 150mL to remove CO 2 In water, prepare a mixed salt solution, take another 9.12g NaOH and dissolve it in 150mL to remove CO 2 In water, the alkaline solution and the mixed salt solution were quickly poured into the colloid mill at room temperature for 1 minute to react, the resulting slurry was hydrothermally crystallized at 120° C. for 8 hours, and the obtained sample was washed to pH=7. The resulting sample was dried at 60°C for 24 hours and ground to obtain nitrate-intercalated zinc-aluminum hydrotalcite (Zn / Al=2) powder; weigh 0.1g nitrate-intercalated zinc-aluminum hydrotalcite powder and 4.0g NaVO 3 Add to 100mL to remove CO 2 In water, use HNO with a concentration of 1.0mol / L 3 Adjust pH=5, pass N at 70°C 2 Perform ion exchange for 48 hours, using CO removal 2 The deionized water was washed to pH = 7 to obtain decavanadate intercalated zinc aluminum hydrotalcite (Zn / Al = 2). Acc...

Embodiment 2

[0032] Weigh 15.384g Mg(NO 3 ) 2 ·6H 2 O and 11.253g Al(NO 3 ) 3 9H 2 O dissolved in 50 mL to remove CO 2 In water, prepare a mixed salt solution, take another 6.84g NaOH and dissolve it in 50mL to remove CO 2 In water, quickly pour the alkali solution and the mixed salt solution into the colloid mill at room temperature to react for 1 minute, and the obtained slurry was hydrothermally crystallized at 140° C. for 10 hours, and the obtained sample was washed to pH=7.5. The resulting sample was dried at 70°C for 20 hours and ground to obtain nitrate-intercalated magnesium-aluminum hydrotalcite (Mg / Al=2) powder; weigh 0.1g nitrate-intercalated magnesium-aluminum hydrotalcite powder and 4.0g NaVO 3 Add to 100mL to remove CO 2 In water, use HNO with a concentration of 1.0mol / L 3 Adjust pH=5, pass N at 50°C 2 Ion exchange was carried out for 72 hours, centrifuged and washed to pH=7.5. CO removal 2 The deionized water was washed to pH = 7.5 to obtain decavanadate intercala...

Embodiment 3

[0036] Weigh 23.220g Co(NO 3 ) 2 ·6H 2 O and 10.010g Al(NO 3) 3 9H 2 O dissolved in 100mL to remove CO 2 In water, prepare a mixed salt solution, take another 8.117g NaOH and dissolve it in 100mL to remove CO 2 In water, quickly pour the alkali solution and the mixed salt solution into the colloid mill at room temperature to react for 1 minute, and the resulting slurry was hydrothermally crystallized at 160° C. for 12 hours, and the obtained sample was washed to pH=7. The resulting sample was dried at 80°C for 12 hours and ground to obtain nitrate-intercalated cobalt-aluminum hydrotalcite (Co / Al=3) powder; weigh 0.1 g of nitrate-intercalated cobalt-aluminum hydrotalcite powder and 4.0 g of NaVO 3 Add to 100mL to remove CO 2 In water, use HNO with a concentration of 1.5mol / L 3 Adjust pH=5.5, pass N at 60°C 2 Perform ion exchange for 60 hours, using CO removal 2 The deionized water was washed to pH = 7 to obtain decavanadate intercalated cobalt aluminum hydrotalcite (C...

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Abstract

The invention relates to a corrosion resistant hydrotalcite / polyelectrolyte composite film and a preparation method thereof, which belongs to the technical field of metallic corrosion protection. The general chemical formula of the corrosion resistant hydrotalcite / polyelectrolyte composite film is (PEI / PAA)m / (I-LDHs)n / (PAA / AEI)m, wherein the PEI stands for polyethyleneimine, the PAA stands for polyacrylic acid, and the I-LDHs stands for inhibitor layered double hydroxides. The preparation method comprises the following steps: firstly, the inhibitor layered double hydrotalcites is prepared, then the inhibitor layered double hydrotalcites and the polyelectrolyte are helically coated on an alumina substrate or a stainless steel substrate, and finally, the corrosion resistant hydrotalcite / polyelectrolyte composite film is prepared by heating the inhibitor layered double hydrotalcites and the polyelectrolyte helically coated on the alumina substrate or the stainless steel substrate and performing crosslinking treatment to the same two. The invention has the advantages that the film is even and compact, has firm combination force with the substrate and excellent corrosion resistance, mild preparation condition, wide application range and good application prospect and overcomes the defects of loose and porous structure and short corrosion resistant life of the pure hydrotalcite film; and hydrotalcite interlayer inhibitor molecules perform driving inhibition function.

Description

technical field [0001] The invention belongs to the technical field of metal corrosion protection, and in particular relates to a corrosion-resistant corrosion inhibitor intercalated hydrotalcite / polyelectrolyte composite film and a preparation method thereof. Background technique [0002] Metal corrosion causes huge economic losses to human beings every year, and damages natural resources and environmental protection. Therefore, it is of great significance to study the corrosion protection of metals. One of the traditional anti-corrosion methods is to use chromium-containing plating or coating, but in recent years, hexavalent chromium has been restricted by countries all over the world due to its high pollution and high carcinogenicity. Therefore, it is imminent to develop a chrome-free, high-efficiency, green and environmentally friendly anti-corrosion system. [0003] In recent years, hydrotalcite compounds (Layered Double Hydroxide, abbreviated as LDHs) have been used i...

Claims

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Application Information

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IPC IPC(8): C23F15/00B32B15/082B32B27/06C01B33/40B05D7/24
Inventor 陈旭雷雨杨文胜
Owner BEIJING UNIV OF CHEM TECH
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