CN104999053B - Ferric-oxide-containing paint used for aluminum alloy cast-infiltration, and method for manufacturing cast-infiltration coating by using same - Google Patents
Ferric-oxide-containing paint used for aluminum alloy cast-infiltration, and method for manufacturing cast-infiltration coating by using same Download PDFInfo
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- CN104999053B CN104999053B CN201510472228.5A CN201510472228A CN104999053B CN 104999053 B CN104999053 B CN 104999053B CN 201510472228 A CN201510472228 A CN 201510472228A CN 104999053 B CN104999053 B CN 104999053B
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Abstract
The invention provides a ferric-oxide-containing paint used for aluminum alloy cast-infiltration, and a method for manufacturing cast-infiltration coating by using the paint. The paint is manufactured by the components in the following proportion of parts by weight: 30-55 parts of Fe2O3, 35-55 parts of CrO3, 2-9 parts of fused salt, 2-5 parts of sodium fluoride, and 1-2 parts of binder. Compared with the prior art, the paint used for aluminum alloy cast-infiltration and the method for manufacturing cast-infiltration coating by using paint are advantaged by few manufacturing procedures, short manufacturing period, and low production cost. Most importantly, through the special paint, combined with a cast-infiltration technology, corrosion resistance of the manufactured coating used for aluminum alloy is greatly improved. Thickness of the coating is between several micrometers to more than ten micrometers, and influence on thermal conductivity of aluminum alloy can be reduced to the largest extent.
Description
Technical field
Oozed with coating the present invention relates to a kind of aluminium alloy casting containing di-iron trioxide and prepare casting impregnation coating using it
Method, can effectively improve the decay resistance of Cast aluminium alloy gold surface, belong to casting technology field.
Background technology
Aluminium is a kind of active metal of chemical property, is just easy to be reacted with oxygen at normal temperatures, generates one layer of cause
Close and firm this layer film of aluminum oxide film can prevent the aluminium of internal layer from further aoxidizing, can meet it is used in everyday will
Ask.But under weak acid, alkalescence condition, the effect of this tunic is limited, it is impossible to the corrosion of aluminium alloy is effectively prevented, thus, to aluminium
The decay resistance of alloy proposes requirement higher.
Such as application of the cast aluminium in condensing type water heater.Condensing heat exchanger is set up in gas heater afterbody, it is possible to decrease row
Cigarette temperature, by the water vapor condensation in flue gas while obvious heat of smoke is discharged, is allowed to discharge latent heat of liquefaction, therefore its thermal efficiency
More conventional water heater is high by 10%~15%.Usual its exhaust gas temperature is less than 110 DEG C, and the thermal efficiency is not less than 96%.Using condensing
Another benefit of gas heater is that condensed water can be by SO in flue gasxAnd NOxDeng sour gas dissolving, flue gas can be effectively reduced
The pollution that discharge is caused, mitigates environmental pollution.
The heat conductivility of cast aluminium is excellent, and, apparently higher than cast iron, aluminium is cheap in addition for thermal conductivity, is adapted to industrial big rule
Mould is used.Secondly, from design, the Reliable Design of cast aluminium heat exchanger also makes it have sufficient advantage：Aluminium heat-exchange device
Wall thickness it is big, on the basis of heat transfer intensity higher is ensured, hydraulic pressure higher can be born, maintain operation steady in a long-term；And
There is good mobility, casting and excellent processability after aluminum alloy melting.Based on these features, cast aluminium condensing heat exchanger is near
It is developed rapidly over year.
But the acidic liquid that pH value is about 3~5 is formd because acidic materials are dissolved in condensed water, meeting heat exchanging device is cold
The aluminium alloy of solidifying section produces serious corrosion, reduces the service life of water heater, the security that influence is used.
Casting is oozed and is also Cast-in-place hardfacing, is that will can form the various alloy powders adhesion of surface particularity ergosphere, paste solid or apply
Brush in the particular surface of casting mold, then pour into a mould liquid metals, using its heat make coating material melt and with base metals thing
Reason is combined or reaction bonded, so as to form the technology of the coating with property in cast(ing) surface.With existing use anodic oxidation, electricity
Plating, chemical plating, laser melting coating, differential arc oxidation and plasma spraying etc., aluminium alloy surface treatment method are compared, and casting is oozed need not be special
The equipment of door, is not limited by cast shape, can process any surface of casting, and be combined for conventional cast and material surface by it
Reinforcement technique is combined, and is surface-treated while casting, and it is solidifying to take full advantage of the waste heat and molten metal of molten metal
Gu when latent heat, without following process, operation is simple, energy consumption reduction.
At present, the research of existing Infiltration technology also has Mg alloy castings technology of infiltration casting in recent years mainly around ferrous metal
Research, and there is presently no the research that Infiltration technology is applied to aluminium alloy.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, di-iron trioxide is contained the invention provides one kind
(hereinafter referred Fe2O3) aluminium alloy casting ooze with coating and using its prepare casting impregnation coating method.
Technical scheme：To achieve the above object, present invention offer one kind contains Fe2O3Aluminium alloy casting ooze and use coating, its master
Will be as made by the component of following weight ratio：
30~55 parts of Fe2O3, 35~55 parts of CrO3, 2~9 parts of fused salt, 2~5 parts of sodium fluorides, 1~2 part of binding agent.
Preferably, described contains Fe2O3Aluminium alloy casting ooze with the main component institute by following weight ratio of coating
It is made：
35~50 parts of Fe2O3, 40~50 parts of CrO3, 4~8 parts of fused salt, 2~5 parts of sodium fluorides, 1~2 part of binding agent.
As another kind preferably, described contains Fe2O3Aluminium alloy casting ooze main by following weight ratio with coating
Made by component：
37 parts of Fe2O3, 45 parts of CrO3, 5 parts of fused salt, 3 parts of sodium fluorides, 2 parts of binding agents.
As another preferred, the Fe2O3Particle size >=250 mesh.
As another kind preferably, the fused salt is by NaCl, KCl and MgCl2It is 18 by mole ratio：47：35 compositions.
As another kind preferably, the binding agent sodium carboxymethylcellulose or polyvinyl alcohol.
Contain Fe present invention also offers described in2O3Aluminium alloy casting ooze with coating preparation cast impregnation coating method, bag
Include following steps：
(1) Fe is taken2O3、CrO3, fused salt, sodium fluoride and binding agent it is well mixed, add pure water to be made coating；
(2) above-mentioned coating is coated in casting mold die cavity or core surface, is dried under the conditions of being 100~120 DEG C in temperature；
(3) melted aluminium liquid is poured into the coating of above-mentioned die cavity or core surface, aluminium liquid and die cavity or core surface
Interact, the coating is obtained final product in cast(ing) surface.
Preferably, the casting mold is waterglass sand mold, resin bonded sand mould or core.
As another kind preferably, the pouring temperature is 720~750 DEG C.
Beneficial effect：Relative to prior art, aluminium alloy casting of the present invention is oozed with coating and prepares casting impregnation coating using it
Method, not only few with manufacturing process, the manufacturing cycle is short, advantage the advantages of low production cost, it is most important that by specific
Coating, with reference to Infiltration technology, the made coating suitable for aluminium alloy, its corrosion resistance is greatly improved；Meanwhile, gained coating
Thickness in a few micrometers between more than ten microns, at utmost reduce the influence to aluminium alloy thermal conductivity.
Specific embodiment
The present invention is further described with reference to embodiment.
Embodiment 1
Component and proportioning：
55 parts of Fe2O3, 50 parts of CrO3, 8 parts of fused salt, 5 parts of sodium fluorides, 1 part of sodium carboxymethylcellulose；
The Fe2O3Particle size >=250 mesh；
The fused salt is by NaCl, KCl and MgCl2It is 18 by mole ratio：47：35 compositions.
Preparation method：
(1) Fe is taken2O3、CrO3, fused salt, sodium fluoride and sodium carboxymethylcellulose it is well mixed, add pure water to be made coating；
(2) above-mentioned coating is coated in waterglass sand mold die cavity, is dried under the conditions of being 100 DEG C in temperature；
(3) melted aluminium liquid is poured into above-mentioned die cavity, pouring temperature is 720 DEG C, the coating of aluminium liquid and mold cavity surface
Interact, the coating is obtained final product in cast(ing) surface.
Embodiment 2
Component and proportioning：
35 parts of Fe2O3, 40 parts of CrO3, 3 parts of fused salt, 3 parts of sodium fluorides, 1 part of polyvinyl alcohol；
The Fe2O3Particle size >=250 mesh；
The fused salt is by NaCl, KCl and MgCl2It is 18 by mole ratio：47：35 compositions.
Preparation method：
(1) Fe is taken2O3、CrO3, fused salt, sodium fluoride and polyvinyl alcohol it is uniform, add pure water to be made coating；
(2) above-mentioned coating is coated in resin bonded sand mould die cavity, is dried under the conditions of being 120 DEG C in temperature；
(3) melted aluminium liquid is poured into above-mentioned die cavity, pouring temperature is 750 DEG C, the coating of aluminium liquid and mold cavity surface
Interact, the coating is obtained final product in cast(ing) surface.
Embodiment 3
Component and proportioning：
37 parts of Fe2O3, 45 parts of CrO3, 5 parts of fused salt, 3 parts of sodium fluorides, 2 parts of sodium carboxymethylcelluloses；
The Fe2O3Particle size >=250 mesh；
The fused salt is by NaCl, KCl and MgCl2It is 18 by mole ratio：47：35 compositions.
Preparation method：
(1) Fe is taken2O3、CrO3, fused salt, sodium fluoride and sodium carboxymethylcellulose it is well mixed, add pure water to be made coating；
(2) above-mentioned coating is coated in core surface, is dried under the conditions of being 110 DEG C in temperature；
(3) melted aluminium liquid is poured into above-mentioned die cavity, pouring temperature is 740 DEG C, the coating on aluminium liquid and core surface
Interact, the coating is obtained final product in cast(ing) surface.
Embodiment 4
Component and weight ratio：
30 parts of Fe2O3, 55 parts of CrO3, 7 parts of fused salt, 4 parts of sodium fluorides, 2 parts of sodium carboxymethylcelluloses；
The Fe2O3Particle size >=250 mesh；
The fused salt is by NaCl, KCl and MgCl2It is 18 by mole ratio：47：35 compositions.
Preparation method：
(1) Fe is taken2O3、CrO3, fused salt, sodium fluoride and sodium carboxymethylcellulose it is well mixed, add pure water to be made coating；
(2) above-mentioned coating is coated in core surface, is dried under the conditions of being 110 DEG C in temperature；
(3) melted aluminium liquid is poured into above-mentioned die cavity, pouring temperature is 730 DEG C, the coating on aluminium liquid and core surface
Interact, the coating is obtained final product in cast(ing) surface.
Embodiment 5
Component and proportioning：
45 parts of Fe2O3, 35 parts of CrO3, 3 parts of fused salt, 3 parts of sodium fluorides, 2 parts of polyvinyl alcohol；
The Fe2O3Particle size >=250 mesh；
The fused salt is by NaCl, KCl and MgCl2It is 18 by mole ratio：47：35 compositions.
Preparation method：
(1) Fe is taken2O3、CrO3, fused salt, sodium fluoride and polyvinyl alcohol it is uniform, add pure water to be made coating；
(2) above-mentioned coating is coated in waterglass sand mold die cavity, is dried under the conditions of being 120 DEG C in temperature；
(3) melted aluminium liquid is poured into above-mentioned die cavity, pouring temperature is 740 DEG C, the coating of aluminium liquid and mold cavity surface
Interact, the coating is obtained final product in cast(ing) surface.
The corrosion resistance detection of experimental example present invention gained coating
(1) prepared by sample.The prismatic sample of the length of side 8mm, 20mm long is prepared, is dried after being cleaned with water.By cylinder top
Uncoated face coats one layer of epoxy resin, and the original weight of sample is measured after solidification, calculates its surface area.
(2) corrosive medium is prepared.Mixed with the deionized water of certain volume with the analytical pure sulfuric acid that mass fraction is 98%,
Prepare the corrosive liquid of pH=3.
(3) corrosion test.Product of trying to please is the beaker of 500ml, is dried after being cleaned with distilled water, the H that addition is prepared2SO4 is molten
Liquid, is put into sample.Beaker is put into 25 DEG C of insulating box, a corrosive liquid is every other day changed, respectively 72,120,168,240
With 336 hours after take out sample, cleaning sample surface simultaneously weighs its weight.
(4) interpretation of result.The corrosion resistance of coating is analyzed using weight-loss method, average corrosion rate is calculated with following formula：
In formula, v is corrosion rate (g/m2H), m0It is the weight (g) before sample corrosion, m1For sample removes corrosion product
Weight (g) afterwards, S is that specimen surface accumulates (m2), t is etching time (h).
Corrosion resistance detection is carried out to the embodiment of the present invention 3,4 and 5 gained coatings using the above method, not add coating
Primary sample is shown in Table 1. as reference substance, testing result
Corrosion rate (the g/m of each sample different time points of table 12·h)
Can be obtained by the result of table 1, present invention gained coating sample does not have significantly corrosion for first 72 hours immersion,
336 hours, corrosion rate was about the 46~49.4% of primary sample, and corrosion resistant performance is significantly improved.
Claims (9)
1. one kind contains Fe2O3Aluminium alloy casting ooze and use coating, it is characterised in that it is made by the component of following weight ratio
Into：
30~55 parts of Fe2O3, 35~55 parts of CrO3, 2~9 parts of fused salt, 2~5 parts of sodium fluorides, 1~2 part of binding agent.
2. it is according to claim 1 to contain Fe2O3Aluminium alloy casting ooze and use coating, it is characterised in that it is by following weight portion
Made by the component of ratio：
35~50 parts of Fe2O3, 40~50 parts of CrO3, 4~8 parts of fused salt, 2~5 parts of sodium fluorides, 1~2 part of binding agent.
3. it is according to claim 1 to contain Fe2O3Aluminium alloy casting ooze and use coating, it is characterised in that it is by following weight portion
Made by the component of ratio：
37 parts of Fe2O3, 45 parts of CrO3, 5 parts of fused salt, 3 parts of sodium fluorides, 2 parts of binding agents.
4. it is according to claim 1 to contain Fe2O3Aluminium alloy casting ooze and use coating, it is characterised in that the Fe2O3Particle
Size >=250 mesh.
5. it is according to claim 1 to contain Fe2O3Aluminium alloy casting ooze and use coating, it is characterised in that the fused salt by
NaCl, KCl and MgCl2It is 18 by mole ratio：47：35 compositions.
6. it is according to claim 1 to contain Fe2O3Aluminium alloy casting ooze and use coating, it is characterised in that the binding agent is carboxylic
Sodium carboxymethylcellulose pyce or polyvinyl alcohol.
7. Fe is contained using described in claim any one of 1-62O3Aluminium alloy casting ooze with coating preparation cast impregnation coating method,
It is characterised in that it includes following steps：
(1) Fe is taken2O3、CrO3, fused salt, sodium fluoride and binding agent it is well mixed, add pure water to be made coating；
(2) above-mentioned coating is coated in casting mold die cavity or core surface, is dried under the conditions of being 100~120 DEG C in temperature；
(3) melted aluminium liquid is poured into above-mentioned die cavity or core surface, the coating generation on aluminium liquid and die cavity or core surface
Interact, the coating is obtained final product in cast(ing) surface.
8. it is according to claim 7 prepare casting impregnation coating method, it is characterised in that the casting mold be waterglass sand mold or
Resin bonded sand mould.
9. it is according to claim 7 to prepare the method for casting impregnation coating, it is characterised in that when being poured into a mould in the step (3)
Temperature is 720~750 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510472228.5A CN104999053B (en) | 2015-08-04 | 2015-08-04 | Ferric-oxide-containing paint used for aluminum alloy cast-infiltration, and method for manufacturing cast-infiltration coating by using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510472228.5A CN104999053B (en) | 2015-08-04 | 2015-08-04 | Ferric-oxide-containing paint used for aluminum alloy cast-infiltration, and method for manufacturing cast-infiltration coating by using same |
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| CN104999053B true CN104999053B (en) | 2017-05-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107052229B (en) * | 2017-04-19 | 2019-04-30 | 东南大学 | A kind of cast aluminium alloy gold type internal oxidition processing coating and the method for preparing surface oxide layer using it |
| CN110238345B (en) * | 2019-06-11 | 2020-07-21 | 南通大学 | Cast aluminum alloy anticorrosive paint and method for preparing surface composite film by using same |
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| US3416941A (en) * | 1963-05-16 | 1968-12-17 | Daikin Ind Ltd | Process for the manufacture of a bearing surface on a steel article including a single sintered layer of bronze particles and a layer of polytetrafluoroethylene |
| JPS57100838A (en) * | 1980-12-15 | 1982-06-23 | Mitsubishi Heavy Ind Ltd | Hardening material for hardening of casting |
| CN1212915A (en) * | 1998-09-02 | 1999-04-07 | 华中理工大学 | Pressureless penetration casting method for aluminium-base composite material |
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