CN104018162B - A kind of preparation method of aluminum alloy surface cathodic protection coatings - Google Patents
A kind of preparation method of aluminum alloy surface cathodic protection coatings Download PDFInfo
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- CN104018162B CN104018162B CN201410258550.3A CN201410258550A CN104018162B CN 104018162 B CN104018162 B CN 104018162B CN 201410258550 A CN201410258550 A CN 201410258550A CN 104018162 B CN104018162 B CN 104018162B
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Abstract
The invention discloses a kind of preparation method of the rich aluminum magnesium alloy coating for aluminium alloy galvanic protection.The inventive method is by epoxy resin, magnalium metal fine powder, solidifying agent, solvent, auxiliary agent, coupling agent, defoamer mixing according to certain ratio; put into ball mill fully to grind; wherein each component is uniformly distributed; be mixed with corrosion protection coating coating; and then adopt the method for spraying or brushing or roller coat that coating is coated in advance through the aluminum alloy surface of washing and ultrasonication is clean; dry 5 ~ 7 days of last at room temperature solidification, can form the cathodic protection coatings of one deck high corrosion resistance in aluminum alloy surface.The coating that the inventive method obtains has good corrosion resistance nature, and the corrosion resistance nature under salt mist environment and briny environment is 10 times of rich magnesium coating, even if after aluminum alloy surface coating damage, still can protect alloy matrix aluminum; Present method is relatively simple, reproducible, is applicable to suitability for industrialized production.
Description
Technical field
The present invention relates to a kind of preparation method of corrosion-resistant finishes, specifically a kind of preparation method of the corrosion-resistant finishes for aluminum alloy surface galvanic protection, belongs to anticorrosion coating material technical field.
Background technology
Al and Alalloy is advantages such as intensity is high, density is little, electrical and thermal conductivity is strong, excellent in mechanical performance, workability are good and be widely used in the fields such as chemical industry, aerospace industry, automobile industry, foodstuffs industry, electronics, instrument industry and shipping industry owing to having.Under field conditions (factors), aluminum alloy surface easily forms the natural oxide film that thick layer is about 4nm, but this tunic porous, uneven and corrosion stability is poor, is difficult to the corrosion of resisting severe environment.
For corrosion of aluminium alloy first in the feature that its surface is carried out, investigator adopts the method for physics or chemistry at the various protective barrier layer of its surface-coated, and body material and corrosive medium are separated, to reach the object of corrosion protection.Utilize this principle; investigator adopts at aluminum alloy surface paint brush; plastics; the organic coatings such as resin coating; thermospray and electric plating method is adopted to prepare metallic aluminium tectum and Ni-P tectum in aluminum alloy surface respectively; but research shows, above-mentioned coating only plays protectiveness covering effect to aluminium alloy.When coating is intact, can only ground resistance delays but can not completely cut off the infiltration of corrosive medium completely in various degree, its provide protection mainly relies on mechanical isolation mechanism.When coatingsurface existing defects or when local is destroyed, accelerate the corrosion of matrix, provide protection is not had to matrix.Therefore, only anticorrosion for a long time in oceanographic engineering of aluminium alloy can not be met by the protectiveness covering effect of coating.
For the defect of above-mentioned protective coating, the concept of zinc-rich paint galvanic protection is incorporated in the coating protection design of aluminium alloy by the seminar that North Dakota stands university professor G.P.Bierwagen leader, consider that the corrosion potential of pure Magnesium and magnesium alloys will lower than the corrosion potential of aluminium, develop " rich magnesium coating and coating system ” ﹝ NannaME, BierwagenGP, JournalofCoatingsTechnologyResearch, 2004, 1 (2): 69-80. ﹞, but in the use procedure of reality, find that rich magnesium coating still comes with some shortcomings, magnesium powder in coating and magnesium alloy powder activity very high, in galvanic protection process, there is strong sacrificial anode effect in magnesium powder, strong galvanic action can be produced, cause organic degraded and aging acceleration in coating, affect the work-ing life of coating.Therefore many investigators carry out modification to magnesium powder, and the spending rate reducing magnesium powder improves the corrosion resistance nature of coating.The people such as Wang Jianguo adopt to be had electroconductibility and carries out modification to the aluminium powder that the galvanic protection effect of magnesium powder has no adverse effects to rich magnesium coating, namely replaces magnesium powder with a certain amount of aluminium powder, reduces the magnesium powder content in coating, improve the corrosion resistance nature of coating.But this method does not fundamentally change the existence of magnesium powder, the anti-corrosion property energy ﹝ king that can only improve coating to a certain extent founds the state, the civilian ﹞ of Beijing University of Chemical Technology master Bi Ye opinion.The people such as ShashiS.Pathak carry out carbonating pre-treatment to magnesium powder,
Add to again in epoxy resin and make rich magnesium coating, make corrosion resistance nature get to the Hen large Ti Gao ﹝ ShashiS.Pathak of coating, MichaelD.Blanton, etal, CorrosionScience, 2010, (52): 3782-92. ﹞; JianguoWang; the people such as YuZuo carry out phosphorylation pre-treatment to magnesium powder; add to again in epoxy resin and make rich magnesium coating; coating is to the protective value of aluminium alloy also get to Hen large Ti Gao ﹝ JianguoWang; YuZuo, etal, AppliedSurfaceScience; 2014,15 (292): 93-97. ﹞.But above-mentioned Measures compare complexity of magnesium powder being carried out to modification, operation is various.
Summary of the invention
The object of the invention is to make up the deficiencies in the prior art; a kind of method preparing high anti-corrosion cathodic protection coatings in aluminum alloy surface is provided; the method prepares coating by adopting corrosion resistance and good and corrosion potential to add in epoxy resin lower than the aluminium-magnesium alloy powder of aluminium alloy; the methods such as brushing, spraying are adopted to be coated on alloy matrix aluminum; realize the corrosion-resistant protection to aluminum alloy surface and matrix, the method has the advantages that technique is simple, controllability is good.
The object of the present invention is achieved like this: according to a certain percentage aluminum magnesium alloy micro mist, epoxy resin, solvent and solidifying agent are hybridly prepared into coating; coating is fully ground in ball mill; each component in coating is uniformly distributed; and then adopt the method for spraying or brushing or roller coat coating to be coated on the aluminum alloy surface cleaned up in advance; dry 5 ~ 7 days of at room temperature solidification, can form the cathodic protection coatings of one deck high corrosion resistance in aluminum alloy surface.
From magnalium binary alloy phase diagram, aluminium-magnesium alloy powder (the mass percentage 40≤x≤60wt% of aluminium) is mainly by intermetallic compound β (Al
12mg
l7) mutually and A1
3mg
2phase composite, β phase and A1
3mg
2the electropotential of phase is respectively-1.27V and-1.29V, corrosion potential-0.85v(SCE lower than aluminium), and both corrosion electric current densities are also very little, the film that coatingsurface corrosion generates is divided into two-layer, top layer is magnesium aluminum hydroxide, and nexine is magnesium aluminum oxide, all has high aluminum concentration, both are corroded at sodium chloride solution very stable being not easy, and have good corrosion resistance nature.Therefore relative to simple rich magnesium coating, the solidity to corrosion of coating itself is greatly improved, and can provide galvanic protection effect simultaneously, thus avoid when coating damage, form galvanic couple to the corrosion accelerating aluminium alloy with alloy matrix aluminum to aluminium alloy.
Technical scheme of the present invention is as follows: a kind of preparation method of the rich aluminum magnesium alloy coating for aluminium alloy galvanic protection, comprises the steps:
(1) aluminum alloy surface is cleaned, decontamination, use distilled water ultrasonic cleaning, be then put into loft drier dry;
(2) according to a certain percentage by epoxy resin, magnalium metal fine powder, solidifying agent, solvent, auxiliary agent, coupling agent, defoamer mixing, put into ball mill and fully grind, wherein each component is uniformly distributed and is mixed with coating;
(3) adopt spraying, brush or paint that step (2) is prepared by the method for roller coat on alloy matrix aluminum, cured at room temperature is dry;
The alloy that described aluminum magnesium alloy micro mist preferably becomes with pure metal magnesium mixed smelting with pure metallic aluminum is for raw material, the particle diameter made by powder-making technique is the micro-fine metal powder of 10 ~ 35 μm, wherein the mass percentage X of pure metallic aluminum is 40≤X≤60wt%, the mass percentage Y of pure metal magnesium is 60≤Y≤40wt%, the percentage composition of pure metallic aluminum and pure metal magnesium and be 100%; The shape of described metal powder can be spherical metal powder, scaled metal powder and profiled metal powder;
Described magnalium metal fine powder, solidifying agent, solvent, auxiliary agent, coupling agent, defoamer, the preferred usage ratio of epoxy resin are 0.65 ~ 0.8:0.2 ~ 0.6:2.0 ~ 0.6:0.005 ~ 0.01:0.02 ~ 0.06:0.1 ~ 0.2:1;
The time of described ball mill grinding is preferably 0.5 ~ 4 hour; The time of described cured at room temperature drying is preferred: 5 ~ 7 days.
Described solidifying agent preferred polyamide.The preferred dimethylbenzene of described solvent and propyl carbinol mix by 7:3.One in the preferred organobentonite of described auxiliary agent or White Carbon black.One in the preferred titanate coupling agent of described coupling agent or silane coupling agent.The preferred silicone oil of described defoamer or mineral oil defoaming agent.
Preferred preparation method, comprises the steps: further
(1) aluminum alloy surface is cleaned, decontamination, with distilled water ultrasonic cleaning 10 ~ 20min, be then put into loft drier dry; The alloy become with pure metal magnesium mixed smelting with pure metallic aluminum is for raw material, and the particle diameter made with powder-making technique is the micro-fine metal powder of 10 ~ 35 μm;
(2) magnalium metal fine powder, solidifying agent, solvent, auxiliary agent, coupling agent, defoamer, epoxy resin are mixed according to amount ratio 0.65 ~ 0.8:0.2 ~ 0.6:2.0 ~ 0.6:0.005 ~ 0.01:0.02 ~ 0.06:0.1 ~ 0.2:1, put into ball mill, 1 ~ 4 hour is fully ground with the stirring velocity of 20 ~ 50Hz, wherein each component is uniformly distributed, is mixed with coating;
(3) adopt spraying, to brush or coating prepared by step (2) is evenly coated on alloy matrix aluminum by the method for roller coat, be then placed in cured at room temperature drying 5 ~ 7 days.
The present invention compared with prior art, has the following advantages:
1) present invention process process is relatively simple, reproducible, is applicable to suitability for industrialized production;
2) coating that the present invention obtains has good corrosion resistance nature, and the corrosion resistance nature under salt mist environment and briny environment is 10 times of rich magnesium coating;
3), after the coating damage that the present invention obtains, still can protect alloy matrix aluminum.
Embodiment
Be described in further details the present invention below by embodiment, these embodiments are only used for the present invention is described, do not limit the scope of the invention.
Embodiment 1 adopts following steps to realize the present invention:
(1) aluminum alloy surface is cleaned, decontamination, with distilled water ultrasonic cleaning 15min, be then put into loft drier dry; The alloy become with pure metal magnesium mixed smelting with pure metallic aluminum is for raw material, and wherein the mass percentage of aluminium is 60%, and the mass percentage of magnesium is 40%, and the particle diameter made with powder-making technique is the micro-fine metal powder of 30 μm;
(2) solvent magnalium metal fine powder, polymeric amide, dimethylbenzene and propyl carbinol mixed by 7:3, White Carbon black, alkane coupling agent, silicon oil foam killer, epoxy resin mix according to amount ratio 0.65:0.2:2.0:0.006:0.02:0.15:1, put into ball mill, 1 hour is fully ground with the stirring velocity of 25Hz, wherein each component is uniformly distributed, is mixed with coating;
(3) adopt the method for spraying to be evenly coated on alloy matrix aluminum by coating prepared by step (2), be then placed in cured at room temperature dry 5 days.
End to be dried, after coating stable, open circuit potential is-1.05V, corrodes 100 days at salt fog cabinet, and observation coating is still intact, has good corrosion resistance nature.
Embodiment 2 adopts following steps to realize the present invention:
(1) aluminum alloy surface is cleaned, decontamination, with distilled water ultrasonic cleaning 10min, be then put into loft drier dry; The alloy become with pure metal magnesium mixed smelting with pure metallic aluminum is for raw material, and wherein the mass percentage of aluminium is 50%, and the mass percentage of magnesium is 50%, and the particle diameter made with powder-making technique is the micro-fine metal powder of 10 μm;
(2) solvent magnalium metal fine powder, polymeric amide, dimethylbenzene and propyl carbinol mixed by 7:3, organobentonite, titanate coupling agent, mineral oil, epoxy resin mix according to amount ratio 0.75:0.4:1.0:0.01:0.03:0.1:1, put into ball mill, 3 hours are fully ground with the stirring velocity of 35Hz, wherein each component is uniformly distributed, is mixed with coating;
(3) adopt the method for brushing evenly to be coated on alloy matrix aluminum by coating prepared by step (2), be then placed in cured at room temperature dry 6 days.
End to be dried, after coating stable, open circuit potential is-0.96V, corrodes 100 days at salt fog cabinet, and observation coating is still intact, has good corrosion resistance nature.
Embodiment 3 adopts following steps to realize the present invention:
(1) aluminum alloy surface is cleaned, decontamination, with distilled water ultrasonic cleaning 20min, be then put into loft drier dry; The alloy become with pure metal magnesium mixed smelting with pure metallic aluminum is for raw material, and wherein the mass percentage of aluminium is 40%, and the mass percentage of magnesium is 60%, and the particle diameter made with powder-making technique is the micro-fine metal powder of 25 μm;
(2) solvent magnalium metal fine powder, polymeric amide, dimethylbenzene and propyl carbinol mixed by 6:4, White Carbon black, titanate coupling agent, silicon oil foam killer, epoxy resin mix according to amount ratio 0.8:0.5:1.5:0.008:0.04:0.1:1, put into ball mill, 4 hours are fully ground with the stirring velocity of 25Hz, wherein each component is uniformly distributed, is mixed with coating;
(3) adopt the method for spraying to be evenly coated on alloy matrix aluminum by coating prepared by step (2), be then placed in cured at room temperature dry 6 days.
End to be dried, after coating stable, open circuit potential is-0.91V, corrodes 100 days at salt fog cabinet, and observation coating is still intact, has good corrosion resistance nature.
Embodiment 4 adopts following steps to realize the present invention:
(1) aluminum alloy surface is cleaned, decontamination, with distilled water ultrasonic cleaning 18min, be then put into loft drier dry; The alloy become with pure metal magnesium mixed smelting with pure metallic aluminum is for raw material, and wherein the mass percentage of aluminium is 60%, and the mass percentage of magnesium is 40%, and the particle diameter made with powder-making technique is the micro-fine metal powder of 35 μm;
(2) solvent magnalium metal fine powder, polymeric amide, dimethylbenzene and propyl carbinol mixed by 7:3, organobentonite, silane coupling agent, mineral oil, epoxy resin mix according to amount ratio 0.7:0.5:1.2:0.006:0.02:0.2:1, put into ball mill, 1 hour is fully ground with the stirring velocity of 25Hz, wherein each component is uniformly distributed, is mixed with coating;
(3) adopt the method for roller coat to be evenly coated on alloy matrix aluminum by coating prepared by step (2), be then placed in cured at room temperature dry 7 days.
End to be dried, after coating stable, open circuit potential is-0.89V, corrodes 100 days at salt fog cabinet, and observation coating is still intact, has good corrosion resistance nature.
Claims (7)
1., for a preparation method for the rich aluminum magnesium alloy coating of aluminium alloy galvanic protection, it is characterized in that: comprise the steps:
(1) aluminum alloy surface is cleaned, decontamination, use distilled water ultrasonic cleaning, be then put into loft drier dry;
(2) according to a certain percentage by epoxy resin, magnalium metal fine powder, solidifying agent, solvent, auxiliary agent, coupling agent, defoamer mixing, put into ball mill and fully grind, wherein each component is uniformly distributed and is mixed with coating;
(3) adopt spraying, brush or paint that step (2) is prepared by the method for roller coat on alloy matrix aluminum, cured at room temperature is dry;
Described magnalium metal fine powder is that the alloy that becomes with pure metal magnesium mixed smelting with pure metallic aluminum is for raw material, the particle diameter made by powder-making technique is the micro-fine metal powder of 10 ~ 35 μm, wherein the mass percentage X of pure metallic aluminum is 40≤X≤60wt%, the mass percentage Y of pure metal magnesium is 60≤Y≤40wt%, the percentage composition of pure metallic aluminum and pure metal magnesium and be 100%; Described metal powder is the one in spherical metal powder, scaled metal powder and profiled metal powder;
The usage ratio of described magnalium metal fine powder, solidifying agent, solvent, auxiliary agent, coupling agent, defoamer, epoxy resin is 0.65 ~ 0.8:0.2 ~ 0.6:2.0 ~ 0.6:0.005 ~ 0.01:0.02 ~ 0.06:0.1 ~ 0.2:1; The time of described ball mill grinding is 0.5 ~ 4 hour;
The time of described cured at room temperature drying is: 5 ~ 7 days.
2. preparation method according to claim 1, is characterized in that: described solidifying agent is polymeric amide.
3. preparation method according to claim 1, is characterized in that: described solvent is that dimethylbenzene and propyl carbinol mix by 7:3.
4. preparation method according to claim 1, is characterized in that: described auxiliary agent is organobentonite or White Carbon black.
5. preparation method according to claim 1, is characterized in that: described coupling agent is titanate coupling agent or silane coupling agent.
6. preparation method according to claim 1, is characterized in that: described defoamer is silicone oil or mineral oil.
7. a preparation method as claimed in claim 1, is characterized in that: comprise following concrete steps:
(1) aluminum alloy surface is cleaned, decontamination, use distilled water ultrasonic cleaning, be then put into loft drier dry; The alloy become with pure metal magnesium mixed smelting with pure metallic aluminum is for raw material, and the particle diameter made with powder-making technique is the micro-fine metal powder of 10 ~ 35 μm;
(2) magnalium metal fine powder, solidifying agent, solvent, auxiliary agent, coupling agent, defoamer, epoxy resin are mixed according to amount ratio 0.65 ~ 0.8:0.2 ~ 0.6:2.0 ~ 0.6:0.005 ~ 0.01:0.02 ~ 0.06:0.1 ~ 0.2:1, put into ball mill, 1 ~ 4 hour is fully ground with the stirring velocity of 10 ~ 50Hz, wherein each component is uniformly distributed, is mixed with coating;
(3) adopt spraying, to brush or coating prepared by step (2) is evenly coated on alloy matrix aluminum by the method for roller coat, be then placed in cured at room temperature drying 5 ~ 7 days.
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| CN106752150A (en) * | 2016-12-23 | 2017-05-31 | 河南圣华原铝业有限公司 | A kind of aluminium alloy environment protection type corrosion resistant coating and its coating processes |
| CN113199021B (en) * | 2021-04-09 | 2022-12-13 | 宁波职业技术学院 | High-performance magnesium alloy composite powder for building material and preparation method thereof |
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