CN107052229B - A kind of cast aluminium alloy gold type internal oxidition processing coating and the method for preparing surface oxide layer using it - Google Patents

A kind of cast aluminium alloy gold type internal oxidition processing coating and the method for preparing surface oxide layer using it Download PDF

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Publication number
CN107052229B
CN107052229B CN201710256406.XA CN201710256406A CN107052229B CN 107052229 B CN107052229 B CN 107052229B CN 201710256406 A CN201710256406 A CN 201710256406A CN 107052229 B CN107052229 B CN 107052229B
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parts
coating
aluminium alloy
type internal
internal oxidition
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CN107052229A (en
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董寅生
王家凯
张成明
黄志海
郭超
盛晓波
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Southeast University
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Southeast University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/18—Measures for using chemical processes for influencing the surface composition of castings, e.g. for increasing resistance to acid attack

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

The invention discloses a kind of cast aluminium alloy gold type internal oxidition processing coating and the method for preparing surface oxide layer using it, the coating to be mainly made of the component of following weight ratio: 60~80 parts of aggregates, 7.4~32.4 parts of Na2Cr2O7·2H2O, 6~9 parts of fused salts, 1.6~3.6 parts of binders, 0.1~0.2 part of suspending agent.Compared to existing process for treating surface, type internal oxidition technology does not need special equipment, it is not limited by cast shape, the corrosion resistance of aluminium alloy castings not only can be improved, and the latent heat when waste heat of molten metal and molten metal being made full use of to solidify, manufacturing process is few, and the manufacturing cycle is short, it is energy saving, reduce production cost.

Description

A kind of cast aluminium alloy gold type internal oxidition processing coating and surface oxidation is prepared using it The method of layer
Technical field
The side of surface oxide layer is prepared the present invention relates to a kind of cast aluminium alloy gold type internal oxidition processing coating and using it Method belongs to aluminium alloy casting technology field.
Background technique
Aluminium is the metallic element that content is most in the earth's crust, the 7.45% of land occupation shell total weight.Aluminium and its alloy are to make at present Most one of the nonferrous materials of dosage, compared with widely used steel material, the density of aluminium is smaller, only the 1/ of cast iron 3, specific strength is high, conductive, excellent heat conductivity, no black brittleness, easy processing, plasticity and good moldability.Currently, aluminium and aluminium alloy material Material has been applied in the life such as building, aerospace, machinery, automobile, navigation, medical treatment extensively in every field.
Under field conditions (factors), surface can generate one layer of fine and close sull to aluminium, and matrix is protected not to be corroded.Aluminium alloy Identical as fine aluminium, surface can also generate the Al that a layer thickness is 0.01 μm~0.05 μm under field conditions (factors)2O3·nH2O film, It can hinder the bioactive molecule of aluminium surface with the contact of surrounding medium, play the role of protecting metal, make aluminium and its alloy material Expect that there is preferable corrosion resistance in neutral and electroless matter environment.Therefore, for a long time, most Al alloy parts are all It is directly to be used without any surface treatment.
But due to the Natural Oxide Film thinner thickness of aluminum alloy surface, protective capacities is extremely limited, and the electrode electricity of aluminium Position is relatively negative, the gases such as oxide, nitrogen oxide and sulfur oxide of the carbon largely discharged in daily life and industrial production, Deviate the pH value of atmosphere neutral；After winter heavy snow, in order to resume traffic faster, some snow melts are often spread on highway Salt increases the Cl in dirt in air-Ion.These substances are once contacted with aluminium alloy, will make the Native Oxide on its surface Film, to lose the protective effect to matrix, corrodes by different degrees of destruction.Therefore, one seen in life A little alloy products can do certain surface treatment, such as aluminium alloy extrusions, structural member, improve its service life with this.
Existing corrosive protection of aluminium alloy process of surface treatment such as anodic oxidation, differential arc oxidation, laser melting coating etc. industrially has Have relatively broad application, they can improve the surface property of part and prolong its service life, but it is long there are the period, at The problems such as this is high, and be the aluminium alloy extrusions for plastic forming mostly, the research of related cast aluminium alloy gold surface treatment with Method is all less.
Patent of invention ZL2015104712048 and ZL2015104711806, and application No. is 2015104722285, 2015104709717,2015104710377 and 2015104720275 publication describes a kind of aluminium alloy casting infiltration respectively With coating and utilize the method for its preparation casting impregnation coating.The deficiency of these coating and method is, the oxidant CrO in coating3 Decomposition temperature is too low, reacts in casting process excessively acutely, leads to be formed by coating quality and is difficult to control, on the other hand, CrO3Oxidisability it is strong, have certain damage, Yi Yinqi sand mold or whose surfaces drop to the adhesive property of resin.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides in a kind of cast aluminium alloy gold type Oxidation processes coating and the method for preparing surface oxide layer using it.
Technical solution: to achieve the above object, the present invention provides a kind of cast aluminium alloy gold type internal oxidition processing coating, It is mainly made of the component of following weight ratio:
60~80 parts of aggregates, 7.4~32.4 parts of Na2Cr2O7·2H2O, 6~9 parts of fused salts, 1.6~3.6 parts of binders, 0.1 ~0.2 part of suspending agent.
It is preferred that the cast aluminium alloy gold type internal oxidition processing is with coating mainly by the component institute group of following weight ratio At:
80 aggregates, 10.7~13.8 parts of Na2Cr2O7·2H2O, 9 parts of fused salts, 3.3~3.4 parts of binders, 0.1~0.2 part Suspending agent.
It is preferred that the cast aluminium alloy gold type internal oxidition processing is with coating mainly by the component institute group of following weight ratio At:
60 parts of aggregates, 10.7~13.8 parts of Na2Cr2O7·2H2O, 6 parts of fused salts, 3.3~3.4 parts of binders, 0.1~0.2 part Suspending agent.
It is preferred that the aggregate is Fe2O3、SiO2、Cr2O3、Al2O3、TiO2One of with SiC, particles of aggregates size >= 320 mesh.
It is preferred that the fused salt is by NaCl, KCl and MgCl2It is 18:47:35 composition by mole ratio.
It is preferred that the binder is sodium bentonite.
It is preferred that the suspending agent is sodium carboxymethylcellulose.
The present invention also provides the sides using the cast aluminium alloy gold type internal oxidition processing coating preparation surface oxide layer Method, comprising the following steps:
(1) aggregate, Na are taken in proportion2Cr2O7·2H2O, fused salt, suspending agent and binder are uniformly mixed, and pure water ball is added Coating is made after mill 1h；
(2) above-mentioned coating is coated in casting mold type chamber or sand core surface, is dried under the conditions of temperature is 120~140 DEG C；
(3) melted molten aluminum is poured into above-mentioned casting mold or sand core, molten aluminum and mold cavity surface or the coating on sand core surface It interacts, in cast(ing) surface up to the oxide layer.
It is preferred that the casting mold is waterglass sand mold or resin bonded sand mould.
It is preferred that the pouring temperature is 720~750 DEG C.
The shortcomings that overcome prior art, improves the corrosion resistance of cast aluminium alloy gold, proposition type internal oxidition of the present invention Method.Sent out in molten aluminum casting process with aluminium alloy using the applying coating containing oxidant in type wall or whose surfaces It answers, increases the thickness of aluminum alloy surface oxide layer.Compared to existing process for treating surface, type internal oxidition technology is not needed specially Equipment, do not limited by cast shape, the corrosion resistance of aluminium alloy castings not only can be improved, but also make full use of metal Latent heat when waste heat and the molten metal solidification of liquid, manufacturing process is few, and the manufacturing cycle is short, energy saving, reduces production cost.It compares In patent of invention ZL2015104712048 and ZL2015104711806, and application No. is 2015104722285, 2015104709717,2015104710377 and 2015104720275 publication, the present invention use Na2Cr2O7·2H2O CrO is replaced as oxidant3, decomposition temperature is higher, and gentler with reacting for cast(ing) surface, reaction process is easy to control System, the defect of coating quality caused by avoiding due to oxidant and cast(ing) surface vigorous reaction.
Technical effect: compared to existing process for treating surface, type internal oxidition technology does not need special equipment, is not cast The limitation of part shape, not only can be improved the corrosion resistance of aluminium alloy castings, but also make full use of the waste heat and gold of molten metal Belonging to latent heat when liquid solidification, manufacturing process is few, and the manufacturing cycle is short, and it is energy saving, reduce production cost.
Specific embodiment
According to following embodiments, the present invention may be better understood.And as it will be easily appreciated by one skilled in the art that embodiment Described specific test result is merely to illustrate the present invention, without that should will not limit sheet described in claims Invention.
Fused salt described in following embodiment is by NaCl, KCl and MgCl2It is 18:47:35 composition by mole ratio.
Embodiment 1:
Component and proportion:
74.7 parts of aggregates, 13.8 parts of Na2Cr2O7·2H2O, 8 parts of fused salts, 3.3 parts of sodium bentonites, 0.2 part of carboxymethyl fibre Tie up plain sodium.
The aggregate is Cr2O3, particle size >=320 mesh of aggregate；
Preparation method:
(1) aggregate, Na are taken2Cr2O7·2H2O, fused salt, suspending agent and binder are uniformly mixed, and are made after pure water ball milling is added At coating；
(2) above-mentioned coating is coated in waterglass sand mold type chamber, is dried under the conditions of temperature is 120 DEG C；
(3) melted molten aluminum is poured into above-mentioned type chamber, pouring temperature is 720 DEG C, the coating of molten aluminum and mold cavity surface It interacts, in cast(ing) surface up to the oxide layer.
Embodiment 2:
Component and proportion:
77.5 parts of aggregates, 10.7 parts of Na2Cr2O7·2H2O, 8 parts of fused salts, 3.6 parts of sodium bentonites, 0.2 part of carboxymethyl fibre Tie up plain sodium.
The aggregate is SiO2, particle size >=320 mesh of the aggregate；
Preparation method:
(1) aggregate, Na are taken2Cr2O7·2H2O, fused salt, suspending agent and binder are uniformly mixed, and are made after pure water ball milling is added At coating；
(2) above-mentioned coating is coated in resin bonded sand mould type chamber, is dried under the conditions of temperature is 130 DEG C；
(3) melted molten aluminum is poured into above-mentioned type chamber, pouring temperature is 730 DEG C, the coating of molten aluminum and mold cavity surface It interacts, in cast(ing) surface up to the oxide layer.
Embodiment 3:
Component and proportion:
75 parts of aggregates, 16.1 parts of Na2Cr2O7·2H2O, 5.8 parts of fused salts, 2.9 parts of sodium bentonites, 0.2 part of carboxymethyl fibre Tie up plain sodium.
The aggregate is Fe2O3, particle size >=320 mesh of the aggregate；
Preparation method:
(1) aggregate, Na are taken2Cr2O7·2H2O, fused salt, suspending agent and binder are uniformly mixed, and are made after pure water ball milling is added At coating；
(2) above-mentioned coating is coated in waterglass sand mold type chamber, is dried under the conditions of temperature is 125 DEG C；
(3) melted molten aluminum is poured into above-mentioned type chamber, pouring temperature is 750 DEG C, the coating of molten aluminum and mold cavity surface It interacts, in cast(ing) surface up to the oxide layer.
Embodiment 4
Component and proportion:
80 parts of aggregates, 7.4 parts of Na2Cr2O7·2H2O, 9 parts of fused salts, 3.5 parts of sodium bentonites, 0.1 part of carboxymethyl cellulose Sodium.
The aggregate is Al2O3, particle size >=320 mesh of the aggregate；
Preparation method:
(1) aggregate, Na are taken2Cr2O7·2H2O, fused salt, suspending agent and binder are uniformly mixed, and are made after pure water ball milling is added At coating；
(2) above-mentioned coating is coated in waterglass sand mold type chamber, is dried under the conditions of temperature is 140 DEG C；
(3) melted molten aluminum is poured into above-mentioned type chamber, pouring temperature is 750 DEG C, the coating of molten aluminum and mold cavity surface It interacts, in cast(ing) surface up to the oxide layer.
Embodiment 5
Component and proportion:
67 parts of aggregates, 25.4 parts of Na2Cr2O7·2H2O, 6 parts of fused salts, 1.6 parts of sodium bentonites, 0.1 part of carboxymethyl cellulose Plain sodium.
The aggregate is TiO2, particle size >=320 mesh of the aggregate；
Preparation method:
(1) aggregate, Na are taken2Cr2O7·2H2O, fused salt, suspending agent and binder are uniformly mixed, and are made after pure water ball milling is added At coating；
(2) above-mentioned coating is coated in waterglass sand mold type chamber, is dried under the conditions of temperature is 130 DEG C；
(3) melted molten aluminum is poured into above-mentioned type chamber, pouring temperature is 750 DEG C, the coating of molten aluminum and mold cavity surface It interacts, in cast(ing) surface up to the oxide layer.
Embodiment 6
Component and proportion:
60 parts of aggregates, 32.4 parts of Na2Cr2O7·2H2O, 6.3 parts of fused salts, 2.2 parts of sodium bentonites, 0.1 part of carboxymethyl fibre Tie up plain sodium.
The aggregate is SiC, particle size >=320 mesh of the aggregate；
Preparation method:
(1) aggregate, Na are taken2Cr2O7·2H2O, fused salt, suspending agent and binder are uniformly mixed, and are made after pure water ball milling is added At coating；
(2) above-mentioned coating is coated in resin sand core surface, is dried under the conditions of temperature is 120 DEG C；
(3) melted molten aluminum is poured into above-mentioned sand core, pouring temperature is 750 DEG C, the coating of molten aluminum and sand core surface It interacts, in cast(ing) surface up to the oxide layer.
Experimental example: the corrosion resistance detection of present invention gained coating
(1) prepared by sample.Side length 8mm is prepared, the prismatic sample of long 20mm is dried after washing 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.It is mixed with the analytical pure sulfuric acid that mass fraction is 98% with the deionized water of certain volume, Prepare the corrosive liquid of pH=3.
(3) corrosion test.Product of trying to please is the beaker of 500ml, dries after being cleaned with distilled water, the H prepared is added2SO4 is molten Liquid is put into sample.Beaker is put into 25 DEG C of insulating box, every other day changes a corrosive liquid, respectively in 24,48,96,240 and Sample is taken out after 360 hours, cleaning sample surface simultaneously weighs its weight.
(4) interpretation of result.Using the corrosion resistance of weight-loss method analysis coating, average corrosion rate is calculated with following formula:
In formula, v is corrosion rate (g/m2H), m0For the weight (g) before sample corrosion, m1Corrosion product is removed for sample Weight (g) afterwards, S are specimen surface product (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 1 each sample different time points of table2·h)
It can be obtained by 1 result of table, present invention gained coating sample is being immersed in 360 hours, and corrosion rate is primary sample About 22.7%~37.2%, corrosion resistant performance significantly improves.

Claims (8)

1. a kind of cast aluminium alloy gold type internal oxidition processing coating, which is characterized in that it is mainly by the group of following weight ratio Divide and formed:
60~80 parts of aggregates, 7.4~32.4 parts of Na2Cr2O7·2H2O, 6~9 parts of fused salts, 1.6~3.6 parts of binders, 0.1~0.2 Part suspending agent；The binder is sodium bentonite, and the suspending agent is sodium carboxymethylcellulose.
2. cast aluminium alloy gold type internal oxidition processing coating according to claim 1, which is characterized in that it is mainly by following The component of weight ratio is formed:
80 parts of aggregates, 10.7~13.8 parts of Na2Cr2O7·2H2O, 9 parts of fused salts, 3.3~3.4 parts of binders, 0.1~0.2 part of suspension Agent.
3. cast aluminium alloy gold type internal oxidition processing coating according to claim 1, which is characterized in that it is mainly by following The component of weight ratio is formed:
60 parts of aggregates, 10.7~13.8 parts of Na2Cr2O7·2H2O, 6 parts of fused salts, 3.3~3.4 parts of binders, 0.1~0.2 part of suspension Agent.
4. cast aluminium alloy gold type internal oxidition according to claim 1 processing coating, which is characterized in that the aggregate is Fe2O3、SiO2、Cr2O3、Al2O3、TiO2One of with SiC, particles of aggregates size >=320 mesh.
5. cast aluminium alloy gold type internal oxidition according to claim 1 processing coating, which is characterized in that the fused salt by NaCl, KCl and MgCl2It is 18:47:35 composition by mole ratio.
6. using the side of coating preparation surface oxide layer using any one of the claim 1-5 cast aluminium alloy gold type internal oxidition processing Method, which comprises the following steps:
(1) aggregate, Na are taken in proportion2Cr2O7·2H2O, fused salt, suspending agent and binder are uniformly mixed, after pure water ball milling 1h is added Coating is made；
(2) above-mentioned coating is coated in casting mold type chamber or sand core surface, is dried under the conditions of temperature is 120~140 DEG C；
(3) melted molten aluminum is poured into above-mentioned casting mold or sand core, molten aluminum and mold cavity surface or the coating on sand core surface occur Interaction, in cast(ing) surface up to the oxide layer.
7. the method according to claim 6 for preparing surface oxide layer, which is characterized in that the casting mold is waterglass sand mold Or resin bonded sand mould.
8. the method according to claim 6 for preparing surface oxide layer, which is characterized in that temperature when casting is 720~ 750℃。
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DE102018101186B4 (en) * 2017-10-17 2021-09-16 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Passive electrical component with an insulating layer created in-situ during casting
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
CN111468705B (en) * 2020-05-12 2021-10-19 东南大学 Composite treatment process for manufacturing corrosion-resistant protective layer on surface of cast aluminum alloy

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CN104999053A (en) * 2015-08-04 2015-10-28 东南大学 Ferric-oxide-containing paint used for aluminum alloy cast-infiltration, and method for manufacturing cast-infiltration coating by using same
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