Corrosion-resistant magnesium aluminum alloy chromium-free passivation solution

A magnesium-aluminum alloy, chromium-free passivation technology, applied in the direction of metal material coating process, etc., can solve the problem that the corrosion resistance of the silane film and the phosphating film are quite different, the corrosion resistance and corrosion resistance are far different, and the To problems such as corrosion resistance, high hardness, reduced agglomeration, and excellent acid and alkali resistance are achieved.

CN104561970AInactive Publication Date: 2015-04-29苏州禾川化学技术服务有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-04-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a corrosion-resistant magnesium aluminum alloy chromium-free passivation solution, which comprises the following components: 10-40 parts of water-base resin, 1-10 parts of nanoparticle sol, 1-10 parts of fluoric-containing acid, 1-5 parts of fluoric acid-containing salt, 1-5 parts of a rare earth catalyst, 1-10 parts of a silane coupling agent, 1-5 parts of a corrosion inhibitor, 1-2 parts of a complexing agent and 40-70% of water. The corrosion-resistant magnesium aluminum alloy chromium-free passivation solution does not contain chromium and other toxic and harmful substances, meets the ROHS environmental protection law of the European Union, and meanwhile, can form an organic and inorganic composite passivation film and a thin film on the surface of a magnesium aluminum layer, and the formed composite passivation film has an excellent physical property and corrosion resistance, and has higher corrosion resistance and long salt fog time, so that the corrosion resistance of a magnesium aluminum alloy plate is better improved.
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Description

technical field

[0001] The invention relates to metal surface treatment technology, in particular to a corrosion-resistant magnesium-aluminum alloy chromium-free passivation solution. Background technique

[0002] Magnesium-aluminum and its alloys are mainly divided into Mg-Al-Mn series, Mg-Al-Zn-Mn series, Mg-Al-Si-Mn series, and Mg-Al-RE series according to different components. The density of magnesium-aluminum alloy is small, which is about 2 / 3 of the density of aluminum. It has high specific strength and specific stiffness, as well as strong shock absorption, strong anti-electromagnetic interference ability, good dimensional stability and machinability. , electrical and thermal conductivity, etc., and have received widespread attention in many fields such as automobiles, electronic appliances, and aviation.

[0003] However, magnesium-aluminum alloys are prone to pitting corrosion, crevice corrosion, stress corrosion and corrosion fatigue when used in humid, industrial...

Examples

Embodiment 1

[0035] A corrosion-resistant magnesium-aluminum alloy chromium-free passivation solution prepared according to the following proportions and methods:

[0036] Prepare material A and material B respectively according to the mass ratio,

[0037] 1) Material A:

[0038] Water-based resin pure acrylic emulsion 20%

[0039] Rare earth catalyst titanyl sulfate 1%

[0040] water 20%

[0041] 2) Material B

[0042]

[0043] Mix material A and material B evenly to obtain a concentrated sample of corrosion-resistant magnesium-aluminum alloy chromium-free passivation solution.

[0044] Dilute the corrosion-resistant magnesium-aluminum alloy chromium-free passivation solution 15 times with water for later use.

[0045] First clean the surface of the magnesium-aluminum parts with an acidic or neutral cleaning solution to remove oil and dust on the surface of the magnesium-aluminum parts; then clean other impurities remaining on the surface of the magnesium-aluminum parts with water...

Embodiment 2

[0047] Preparation of corrosion-resistant magnesium-aluminum alloy chromium-free passivation solution:

[0048] Prepare material A and material B respectively according to the mass ratio,

[0049] 1) Material A:

[0050] Silicone acrylic emulsion 30%

[0051] Ammonium Metavanadate 3%

[0052] water 30%

[0053] 2) Material B

[0054]

[0055] Mix material A and material B evenly to obtain a concentrated sample of corrosion-resistant magnesium-aluminum alloy chromium-free passivation solution.

[0056] Dilute the corrosion-resistant magnesium-aluminum alloy chromium-free passivation solution 15 times with water for later use.

[0057] First clean the surface of the magnesium-aluminum parts with an acidic or neutral cleaning solution to remove the oil and dust on the surface of the magnesium-aluminum parts; Alloy chromium-free passivation liquid dilution, the passivation temperature is 25 ° C, the passivation time is about 2 minutes, dried at 100-120 ° C, or at room tem...

Embodiment 3

[0059] Preparation of corrosion-resistant magnesium-aluminum alloy chromium-free passivation solution:

[0060] Prepare material A and material B respectively according to the mass ratio,

[0061] 1) Material A:

[0062] Styrene Acrylic Emulsion 25%

[0063] Vanadium acetylacetonate 5%

[0064] water 25%

[0065] 2) Material B

[0066]

[0067] Mix material A and material B evenly to obtain a concentrated sample of corrosion-resistant magnesium-aluminum alloy chromium-free passivation solution.

[0068] Dilute the corrosion-resistant magnesium-aluminum alloy chromium-free passivation solution 15 times with water for later use.

[0069] First clean the surface of the magnesium-aluminum parts with an acidic or neutral cleaning solution to remove the oil and dust on the surface of the magnesium-aluminum parts; Alloy chromium-free passivation liquid dilution, the passivation temperature is 25 ° C, the passivation time is about 2 minutes, dried at 100-120 ° C, or at room t...