Method for electrodepositing inhibitor anion intercalation hydrotalcite film on surface of magnesium alloy

A technology of anion intercalation and corrosion inhibitor, applied in the direction of electrolytic inorganic material coating, etc., can solve the problems of insufficient mechanical properties, weak bonding force between the film and the substrate, etc., and achieve the effect of good bonding

Inactive Publication Date: 2009-12-09
HARBIN ENG UNIV
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Problems solved by technology

The hydrotalcite film layer prepared by the various methods used in the above-mentioned documents, on the one hand, only selects CO 3 2- The intercalated hydrotalcite is the film material; on

Method used

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  • Method for electrodepositing inhibitor anion intercalation hydrotalcite film on surface of magnesium alloy
  • Method for electrodepositing inhibitor anion intercalation hydrotalcite film on surface of magnesium alloy

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preparation example Construction

[0014] Preparation of corrosion-inhibiting anion-intercalated hydrotalcites:

[0015] At room temperature, the soluble nitrate of +2-valent and +3-valent metal ions is prepared into an aqueous solution with distilled water, and the molar ratio of +2-valent and +3-valent metal ions is 1.8 to 2.2, and the +2-valent metal ion can be Mg 2+ , Zn 2+ , Ni 2+ , Ce 2+ , Fe 2+ ;+3 valent metal ion can be Al 3+ , Cr 3+ , Ce 3+ , Fe 3+ , Ti 3+ ; In addition, take a certain amount of sodium salt of the corrosion inhibitor anion to be inserted into the hydrotalcite layer, the molar ratio of the anion to the +3 valent metal ion is 1.5 to 2.0, and the anion can be VO 3 - / V 10 o 28 6- 、MoO 4 2- / Mo 7 o 24 6- 、WO 4 2- , CrO 4 2- Or phosphomolybdate; choose NaOH solution or ammonia as the precipitant. Add the sodium salt solution of the anion to be inserted between the hydrotalcite layers into the container, then drop the soluble nitrate solution of +2-valent and +3-valent...

example 1

[0021]Example 1: Preparation of vanadate intercalated zinc aluminum hydrotalcite film

[0022] Steps: Weigh 1.0-5.0 g of the fully ground hydrotalcite sample, place it in a conical flask filled with 100 mL of deionized water, ultrasonically disperse for 30-60 min, soak for 7 days, and then ultrasonically disperse for 10-20 min. Take 50-100mL of the suspension, add NaVO 3 and AlCl 3 , control VO 3 - The molar concentration of Cl is 0.005~0.01mol / L, and the Cl - The molar concentration is 0.002-0.006mol / L, and it is transferred into the three-electrode system, and the pH value is controlled to be 5.5-6.5; 2 , to remove dissolved oxygen and CO from the suspension 2 ; After 10 minutes, connect the electrode system, the magnesium alloy sample is used as the working electrode, and the platinum sheet is used as the counter electrode. Electrochemical cycle scanning is used. The scanning rate is 5 ~ 30mV / s, and the scanning range is -1.65 ~ -0.50V vs Ref. The number of cycles 8 t...

example 2

[0023] Example 2: Preparation of molybdate intercalated magnesium aluminum hydrotalcite film

[0024] Steps: Weigh 1.0-5.0 g of the fully ground hydrotalcite sample, place it in a conical flask filled with 100 mL of deionized water, ultrasonically disperse for 30-60 min, soak for 7 days, and then ultrasonically disperse for 10-20 min. Take 50-100mL of the suspension, add Na 2 MoO 4 , to control MoO 4 2- The molar concentration is 0.005~0.01mol / L, and it is transferred into the three-electrode system, and the pH value is controlled to be 7.5; 2 , to remove dissolved oxygen and CO from the suspension 2 ; After 10 minutes, connect the electrode system, the magnesium alloy sample is used as the working electrode, and the platinum sheet is used as the counter electrode. Electrochemical cycle scanning is used. The scanning rate is 5 ~ 30mV / s, the scanning range is -1.60 ~ -0.50V vs Ref, and the number of cycles 5 times, the film thickness is 8 μm.

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Abstract

The invention provides a method for electrodepositing an inhibitor anion intercalation hydrotalcite film on the surface of magnesium alloy. In a three-electrode system, a solution containing corrosion-inhibition anion intercalation hydrotalcite is used as electrolyte, magnesium alloy is used as a working electrode, a platinum sheet is used as a counter electrode, N2 is introduced at room temperature, the pH value of the electrolyte is 4.5 to 8.5, the scanning rate is 5 to 30mV/s, the scanning frequency is 5 to 15 times, and a hydrotalcite film is formed on the surface of the magnesium alloy by an electrodepositing method. In the invention, the corrosion-inhibition anion intercalation hydrotalcite forms a film on the surface of the magnesium alloy by the electrodepositing method, a protective film with the functions of adsorbing corrosive ions and releasing an inhibitor is formed on the surface of the magnesium alloy by the etching of trace Cl and the excellent adsorption and film formation characters of corrosion-inhibition ions, and the film layer has corrosion prevention character, has favorable binding property with a magnesium alloy basal body and can also be better bonded with an organic coating.

Description

(1) Technical field [0001] The invention relates to a surface treatment method for alloy materials, in particular to an anticorrosion treatment method for the surface of magnesium alloys. (2) Background technology [0002] Magnesium alloy has excellent physical and mechanical properties such as low density, high specific strength, high hardness, good processing performance, and good electromagnetic shielding, so it has broad application prospects in communication electronics, automobiles, aerospace and other fields. However, the chemical stability of magnesium is low, the electrode potential is very negative (-2.34V), and the corrosion resistance is poor, which restricts the wide application of magnesium alloy materials to a certain extent. At present, the surface treatment methods aimed at improving the corrosion resistance of magnesium alloys mainly include: electroplating and chemical plating Ni / Ti / Mn / Al / Fe / Co / Zr / Mo / Nb / W, thermal spraying aluminum, ceramic coating, laser ...

Claims

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Application Information

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IPC IPC(8): C25D9/04
Inventor 于湘李俊青王君景晓燕张密林
Owner HARBIN ENG UNIV
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