CN104455349B - Manufacturing method of magnesium alloy transmission box with corrosion resistance - Google Patents

Manufacturing method of magnesium alloy transmission box with corrosion resistance Download PDF

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Publication number
CN104455349B
CN104455349B CN201410715922.0A CN201410715922A CN104455349B CN 104455349 B CN104455349 B CN 104455349B CN 201410715922 A CN201410715922 A CN 201410715922A CN 104455349 B CN104455349 B CN 104455349B
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magnesium alloy
coating
corrosion resistance
formwork
cabinet
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CN104455349A (en
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张志东
马卫东
王东
周启飞
王守仁
张少运
梁振星
燕波
刘子利
康传贝
唐功芹
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Shandong Meng Wo Speed Changer Co Ltd
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Shandong Meng Wo Speed Changer Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/032—Gearboxes; Mounting gearing therein characterised by the materials used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/30—Anodisation of magnesium or alloys based thereon

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

The invention discloses a manufacturing method of a magnesium alloy transmission box with ultrahigh corrosion resistance. The manufacturing method comprises the following steps: performing foaming, forming a cluster structure, swabbing I, swabbing II, hardening, roasting, swabbing III, smelting and pouring, and micro-arc oxidation in sequence, and obtaining a casting of the magnesium alloy transmission box attached with a dense Al2O3 oxidation film on the surface layer. The manufacturing method disclosed by the invention has the following characteristics: during the formwork roasting process, the foamed plastic is burned up in advance to avoid the influence of high-temperature foam gasification to the quality of the casting during the pouring process, avoid the influence of carbon dust to the strength of the magnesium alloy, and ensure the purity of the magnesium alloy material; the nanometer powered aluminum dip-coated before pouring is molten and tightly attached to the surface of the casting at high temperature in the pouring process to form a complete aluminum protective film, and then form the dense Al2O3 oxidation film during the follow-up micro-arc oxidation process, so as to tightly coat the magnesium alloy, improve the oxidation resistance and the corrosion resistance of the magnesium alloy, and solve the problem that the oxidation resistance and the corrosion resistance of the magnesium alloy for the existing transmission box are insufficient.

Description

A kind of manufacture method of the magnesium alloy for cabinet of speed changer of corrosion resistance
Technical field
The present invention relates to mission case manufacturing technology field, the magnesium alloy change of specifically a kind of superpower corrosion resistance The manufacture method of fast device casing.
Background technology
, as structural metallic materials the lightest at present, its density is low for magnesium alloy, and specific strength, specific stiffness are high, have good Damping and amortization, damping performance is good.The fusing point of magnesium alloy is low, and setting rate is fast to fill type soon so as to consume energy low in casting technique, Casting character is good, and thermal conductivity and capability of electromagnetic shielding are excellent, and machinability is good, is described as the green engineering material in this century Material, in space flight, automobile, the field such as electronics industry is widely used, for example gear box of automobile, cylinder cover, wheel hub, Seat support etc..With the continuous improvement of energy-conserving and environment-protective consciousness, automotive light weight technology demand is increasingly urgent, the fall of vehicle complete vehicle quality The low important means being to reduce fuel consumption, under proof strength, rigidity requirement, magnesium alloy becomes automobile lightweight, carries The preferred material of high energy-saving environment protection, thus bring new power for magnesium alloy in the development further of industrial circle.However, When magnesium-alloy material works in the environment exposing, easily oxidized, corrosion, particularly easy with during other metal parts assembly connections Produce galvanic corrosion, stress corrosion etc..Significantly reduce functional reliability and the service life of product, make magnesium-alloy material Application level is subject to larger restriction.
Lost foam casting is that a kind of allowance is little, the high casting method of casting accuracy.Its general principle is to adopt and institute Need the identical foamed plastics of cast shape to replace mold to carry out moulding, and bubbles model does not take out, and directly pours into molten metal It is vaporized so that molten metal forms foundry goods.Mission case complex contour is changeable, can be more preferable using lost foam casting Realize optimal box casting shape.But during traditional evaporative pattern casting magnesium alloy mission case, foam pyrolytic gasification produces The cavity filling that raw compound not only affects aluminium alloy can be also closely related with the defect of foundry goods, and thermal decomposition product meeting and alloy Liquid reacts, and changes the composition proportion of aluminium alloy, the mechanical property of impact tank material, particularly magnesium alloy fused mass is to gas Sensitiveness is stronger, and very easy air-breathing produces pore, causes empty class defect to produce.
Therefore, develop a kind of manufacture method pair that can manufacture the magnesium alloy for cabinet of speed changer with superpower resistance to corrosion Automobile lightweight, reduces fuel consumption, expand magnesium-alloy material application scale is significant and economic worth.
Content of the invention
The technical assignment of the present invention is to provide a kind of manufacture method of the magnesium alloy for cabinet of speed changer of superpower corrosion resistance.
The technical assignment of the present invention is realized in the following manner, and this manufacture method step is as follows:
1) foam: from polystyrene as white mould foamed material, speed change is manufactured using curing foam process pressure stamp Device casing bubbles model；
2) organize cluster: by every for described bubbles model two pieces group cluster, bonding pouring and riser systemses and impurity filtering net；
3) swabbing one: add Ludox and wetting agent to stir in agitator, then be slowly added zirconium English in bucket Powder, continuously stirs and prevents from luming, add defoamer mixing and stirring, mixing time 12 hours；By the coating stirring one Uniformly brushing bubbles model surfaces externally and internally 3 times, has often brushed a coating, and standing no coating goes on special sander all when dripping Even spread quartz sand, first pass granularity 100-120 mesh, second and third is less than 0.3% all over granularity 60-80 mesh, water content, and dust quality is divided Number is less than 0.3%；Standing and drying 12 hours, environment temperature 22-250C, relative humidity 60%, wind speed 3m/s；
4) swabbing two and hardening: add sodium silicate binder in agitator, be slowly added to mullite in whipping process Powder, continuously stirs and prevents from luming, mixing time 8 hours；The coating stirring two is uniformly brushed model surfaces externally and internally four times, Often brush a coating, standing no coating goes to when dripping and uniformly spreads mullite sand on sander, is then immersed in aluminium chloride molten Harden 15 minutes in liquid, room temperature standing and drying 2 hours；After repetition aforesaid operations three times, not stucco after the 4th coating of brush；It Stand empty dry 4 hours afterwards, environment temperature 22-250C, relative humidity 60%, wind speed 3m/s；
5) roasting: the formwork being dried after hardening is pushed roasting in roaster, sintering temperature 10400C, roasting time 2 is little When, in formwork in roasting process, moisture fully evaporates, and foamed plastics ablation becomes carbon ash；After coming out of the stove when temperature is down to room temperature, will Carbon ash in whole formwork is blown away, and obtains the formwork with sufficient intensity；
6) swabbing three: by the formwork immersion coating three after roasting, make the abundant dip-coating paint of formwork surfaces externally and internally three, so After deliver in baking room be dried, 12 hours time, environment temperature 430c；
7) smelting and pouring: one case two pieces is imbedded formwork in sandbox and shaken consolidation, then vacuumizes, makes pressure reach 0.03-0.035mpa；Magnesium alloy ingot is smelted into molten metal and is poured into a mould into formwork, after cast, keep vacuum pressurize 10- 15 minutes, it is poured, cup sprinkles coverture, unpack after solidification to be cooled, excise dead head, obtain foundry goods；
8) differential arc oxidation: foundry goods deionized water is cleaned 2 minutes, anode aluminum steel is connected with foundry goods, and corrosion resistant plate does the moon In pole immersion electrolyte, under 380v-450v pulse voltage, carry out differential arc oxidation, current density 5-9a/dm2, conduction time 5-30 Minute；After the completion of differential arc oxidation, foundry goods is taken out in power-off, washes off raffinate, and drying both can obtain top layer and be attached with one layer of cause Close al2o3The magnesium alloy for cabinet of speed changer foundry goods of oxide-film.
In described step 3), wetting agent is sodium alkyl sulfonate, and defoamer is silicones, Ludox and wetting agent, zirconium English Powder, the adding proportion of defoamer are: 1kg Ludox adds 1.6ml wetting agent and adds 3.4kg zirconium English powder interpolation 1.2ml defoamer, Stirring gained slurry viscosity 34-39 pa*s, zirconium English Powder Particle Size 320 mesh.
In described step 4), the adding proportion of waterglass and mullite powder is: 1kg waterglass adds 1.4kg mullite powder, Granularity 320 mesh of mullite powder, stirs resulting material viscosity 9-14 pa*s.
Three times mullite sand, first pass mullite fineness of sand 30-60 mesh is spread, second and third time does not come in described step 4) Stone sand granularity 10-30 mesh.
In described step 6), the composition of coating three is the mixed slurry of nanometer aluminium powder and Kaolin binder, mixed slurry Viscosity 25-30 pa*s.
Coverture in described step 7) is the mixture of villaumite and villiaumite.
Described villaumite is mgcl2Or kcl, villiaumite is caf2.
In described step 8), bath composition is: 45-50g/l calgon, 6-12g/l NaOH, adds suitable Amount water stirs, and ph value controls in 7-9.
Compared to the prior art the manufacture method of the magnesium alloy for cabinet of speed changer of a kind of superpower corrosion resistance of the present invention, has There are following characteristics: in advance foamed plastics is burnt in formwork roasting process, it is to avoid because of foam high-temperature gasification pair in casting process The impact of casting quality, it is to avoid the impact to magnesium alloy strength for the carbon ash is it is ensured that the pure property of magnesium alloy materials；Before cast The aluminium powder of dip-coating melts under the high temperature of casting process and is adhering closely to cast(ing) surface and forms complete aluminium diaphragm, follow-up Form the al of densification in micro-arc oxidation process2o3Oxide-film, by magnesium alloy tight internally, substantially increases magnesium alloy Anti-oxidant, corrosion resistance, solves mission case magnesium alloy oxidation and corrosion scarce capacity in light-weight design Problem.
Specific embodiment
Embodiment 1:
The each component of mission case casting magnesium alloy material and mass percent be, al:8.6%, zn:0.65%, mn: 0.16%, surplus mg and impurity.
Step is as follows:
1) foam: from polystyrene as white mould foamed material, speed change is manufactured using curing foam process pressure stamp Device casing bubbles model；
2) organize cluster: by every for described bubbles model two pieces group cluster, bonding pouring and riser systemses and impurity filtering net；
3) swabbing one: add Ludox and sodium alkyl sulfonate to stir in agitator, then be slowly added in bucket Zirconium English powder, continuously stirs and prevents from luming, add silicones mixing and stirring, the adding proportion of mentioned component is: 1kg Ludox Add 1.6ml sodium alkyl sulfonate, add the zirconium English powder of 3.4kg granularity 320 mesh, add 1.2ml silicones, mixing time 12 is little When, stir gained slurry viscosity 34-39 pa*s；The coating stirring one is uniformly brushed bubbles model surfaces externally and internally 3 times, Often brush a coating, standing no coating goes to when dripping and uniformly spreads quartz sand on special sander, first pass granularity 120 mesh, Second and third is less than 0.3% all over granularity 80 mesh, water content, and concentration is less than 0.3%；Standing and drying 12 hours, environment temperature 250C, relative humidity 60%, wind speed 3m/s；
4) swabbing two and hardening: add sodium silicate binder in agitator, be slowly added to granularity 320 in whipping process Purpose mullite powder, adding proportion is: 1kg waterglass adds 1.4kg mullite powder, continuously stirs and prevents from luming, mixing time 8 is little When, stir resulting material viscosity 14 pa*s；The coating stirring two is uniformly brushed model surfaces externally and internally four times, often brushed A time coating, standing no coating goes to when dripping and uniformly spreads mullite sand on sander, is then immersed in liquor alumini chloridi hard Change 15 minutes, room temperature standing and drying 2 hours；After repetition aforesaid operations three times, not stucco after the 4th coating of brush, first three time is spread First pass mullite fineness of sand 60 mesh in sand, second and third is all over mullite fineness of sand 30 mesh；Stand empty dry 4 hours afterwards, environment Temperature 250C, relative humidity 60%, wind speed 3m/s；
5) roasting: the formwork being dried after hardening is pushed roasting in roaster, sintering temperature 10400C, roasting time 2 is little When, in formwork in roasting process, moisture fully evaporates, and foamed plastics ablation becomes carbon ash；After coming out of the stove when temperature is down to room temperature, will Carbon ash in whole formwork is blown away, and obtains the formwork with sufficient intensity；
6) swabbing three: by the formwork immersion coating three after roasting, the composition of coating three is nanometer aluminium powder and kaolin The mixed slurry of binding agent, adding proportion is: 1kg nanometer aluminium powder is mixed with 10kg kaolin, mixed slurry viscosity 30 pa*s； Make the abundant dip-coating paint of formwork surfaces externally and internally three, be then sent to be dried in baking room, 12 hours time, environment temperature 430c；
7) smelting and pouring: one case two pieces is imbedded formwork in sandbox and shaken consolidation, then vacuumizes, makes pressure reach 0.035mpa；Magnesium alloy ingot is smelted into molten metal and is poured into a mould into formwork, keep vacuum pressurize 15 minutes after cast, pour Note finishes, and sprinkles coverture on cup, and coverture is mgcl2And caf2Mixture, after solidification to be cooled unpack, excision Dead head, obtains foundry goods；
8) differential arc oxidation: foundry goods deionized water is cleaned 2 minutes, anode aluminum steel is connected with foundry goods, and corrosion resistant plate does the moon In pole immersion electrolyte, bath composition is: 48g/l calgon, 9g/l NaOH, adds suitable quantity of water to stir, Ph value controls 8；Carry out differential arc oxidation, current density 9a/dm2,30 minutes conduction time under 450v pulse voltage；Differential arc oxidation After the completion of, foundry goods is taken out in power-off, washes off raffinate, and drying both can obtain top layer and be attached with one layer of fine and close al2o3Oxide-film Magnesium alloy for cabinet of speed changer foundry goods.
Embodiment 2:
The each component of mission case casting magnesium alloy material and mass percent be, al:3.19%, zn:0.81%, mn: 0.33%, surplus mg and impurity.
Step is as follows:
1) foam: from polystyrene as white mould foamed material, speed change is manufactured using curing foam process pressure stamp Device casing bubbles model；
2) organize cluster: by every for described bubbles model two pieces group cluster, bonding pouring and riser systemses and impurity filtering net；
3) swabbing one: add Ludox and sodium alkyl sulfonate to stir in agitator, then be slowly added in bucket Zirconium English powder, continuously stirs and prevents from luming, add silicones mixing and stirring, the adding proportion of mentioned component is: 1kg Ludox Add 1.6ml sodium alkyl sulfonate, add the zirconium English powder of 3.4kg granularity 320 mesh, add 1.2ml silicones, mixing time 12 is little When, stir gained slurry viscosity 34-39 pa*s；The coating stirring one is uniformly brushed bubbles model surfaces externally and internally 3 times, Often brush a coating, standing no coating goes to when dripping and uniformly spreads quartz sand on special sander, first pass granularity 100 mesh, Second and third is less than 0.3% all over granularity 60 mesh, water content, and concentration is less than 0.3%；Standing and drying 12 hours, environment temperature 220C, relative humidity 60%, wind speed 3m/s；
4) swabbing two and hardening: add sodium silicate binder in agitator, be slowly added to granularity 320 in whipping process Purpose mullite powder, adding proportion is: 1kg waterglass adds 1.4kg mullite powder, continuously stirs and prevents from luming, mixing time 8 is little When, stir resulting material viscosity 9 pa*s；The coating stirring two is uniformly brushed model surfaces externally and internally four times, often brushed one All over coating, standing no coating goes to when dripping and uniformly spreads mullite sand on sander, is then immersed in hardening in liquor alumini chloridi 15 minutes, room temperature standing and drying 2 hours；After repetition aforesaid operations three times, not stucco after the 4th coating of brush, first three is all over stucco In first pass mullite fineness of sand 30 mesh, second and third is all over mullite fineness of sand 10 mesh；Stand empty dry 4 hours afterwards, environment temperature Degree 220C, relative humidity 60%, wind speed 3m/s；
5) roasting: the formwork being dried after hardening is pushed roasting in roaster, sintering temperature 10400C, roasting time 2 is little When, in formwork in roasting process, moisture fully evaporates, and foamed plastics ablation becomes carbon ash；After coming out of the stove when temperature is down to room temperature, will Carbon ash in whole formwork is blown away, and obtains the formwork with sufficient intensity；
6) swabbing three: by the formwork immersion coating three after roasting, the composition of coating three is nanometer aluminium powder and kaolin The mixed slurry of binding agent, adding proportion is: 1kg nanometer aluminium powder is mixed with 10kg kaolin, mixed slurry viscosity 25 pa*s； Make the abundant dip-coating paint of formwork surfaces externally and internally three, be then sent to be dried in baking room, 12 hours time, environment temperature 430c；
7) smelting and pouring: one case two pieces is imbedded formwork in sandbox and shaken consolidation, then vacuumizes, makes pressure reach 0.03mpa；Magnesium alloy ingot is smelted into molten metal and is poured into a mould into formwork, keep vacuum pressurize 10 minutes after cast, pour Note finishes, and sprinkles coverture on cup, and coverture is kcl and caf2Mixture, after solidification to be cooled unpack, excision pour Rising head, obtains foundry goods；
8) differential arc oxidation: foundry goods deionized water is cleaned 2 minutes, anode aluminum steel is connected with foundry goods, and corrosion resistant plate does the moon In pole immersion electrolyte, bath composition is: 50g/l calgon, 12g/l NaOH, adds suitable quantity of water to stir, Ph value controls 9；Carry out differential arc oxidation, current density 5a/dm2,5 minutes conduction time under 380v pulse voltage；Differential arc oxidation After the completion of, foundry goods is taken out in power-off, washes off raffinate, and drying both can obtain top layer and be attached with one layer of fine and close al2o3Oxide-film Magnesium alloy for cabinet of speed changer foundry goods.
Embodiment 3:
The each component of mission case casting magnesium alloy material and mass percent be, al:5.2%, zn:0.75%, mn: 0.25%, surplus mg and impurity.
Step is as follows:
1) foam: from polystyrene as white mould foamed material, speed change is manufactured using curing foam process pressure stamp Device casing bubbles model；
2) organize cluster: by every for described bubbles model two pieces group cluster, bonding pouring and riser systemses and impurity filtering net；
3) swabbing one: add Ludox and sodium alkyl sulfonate to stir in agitator, then be slowly added in bucket Zirconium English powder, continuously stirs and prevents from luming, add silicones mixing and stirring, the adding proportion of mentioned component is: 1kg Ludox Add 1.6ml sodium alkyl sulfonate, add the zirconium English powder of 3.4kg granularity 320 mesh, add 1.2ml silicones, mixing time 12 is little When, stir gained slurry viscosity 34-39 pa*s；The coating stirring one is uniformly brushed bubbles model surfaces externally and internally 3 times, Often brush a coating, standing no coating goes to when dripping and uniformly spreads quartz sand on special sander, first pass granularity 110 mesh, Second and third is less than 0.3% all over granularity 70 mesh, water content, and concentration is less than 0.3%；Standing and drying 12 hours, environment temperature 230C, relative humidity 60%, wind speed 3m/s；
4) swabbing two and hardening: add sodium silicate binder in agitator, be slowly added to granularity 320 in whipping process Purpose mullite powder, adding proportion is: 1kg waterglass adds 1.4kg mullite powder, continuously stirs and prevents from luming, mixing time 8 is little When, stir resulting material viscosity 11 pa*s；The coating stirring two is uniformly brushed model surfaces externally and internally four times, often brushed A time coating, standing no coating goes to when dripping and uniformly spreads mullite sand on sander, is then immersed in liquor alumini chloridi hard Change 15 minutes, room temperature standing and drying 2 hours；After repetition aforesaid operations three times, not stucco after the 4th coating of brush, first three time is spread First pass mullite fineness of sand 50 mesh in sand, second and third is all over mullite fineness of sand 20 mesh；Stand empty dry 4 hours afterwards, environment Temperature 240C, relative humidity 60%, wind speed 3m/s；
5) roasting: the formwork being dried after hardening is pushed roasting in roaster, sintering temperature 10400C, roasting time 2 is little When, in formwork in roasting process, moisture fully evaporates, and foamed plastics ablation becomes carbon ash；After coming out of the stove when temperature is down to room temperature, will Carbon ash in whole formwork is blown away, and obtains the formwork with sufficient intensity；
6) swabbing three: by the formwork immersion coating three after roasting, the composition of coating three is nanometer aluminium powder and kaolin The mixed slurry of binding agent, adding proportion is: 1kg nanometer aluminium powder is mixed with 10kg kaolin, mixed slurry viscosity 28 pa*s； Make the abundant dip-coating paint of formwork surfaces externally and internally three, be then sent to be dried in baking room, 12 hours time, environment temperature 430c；
7) smelting and pouring: one case two pieces is imbedded formwork in sandbox and shaken consolidation, then vacuumizes, makes pressure reach 0.032mpa；Magnesium alloy ingot is smelted into molten metal and is poured into a mould into formwork, keep vacuum pressurize 13 minutes after cast, pour Note finishes, and sprinkles coverture on cup, and coverture is mgcl2And caf2Mixture, after solidification to be cooled unpack, excision Dead head, obtains foundry goods；
8) differential arc oxidation: foundry goods deionized water is cleaned 2 minutes, anode aluminum steel is connected with foundry goods, and corrosion resistant plate does the moon In pole immersion electrolyte, bath composition is: 45g/l calgon, 6g/l NaOH, adds suitable quantity of water to stir, Ph value controls 7；Carry out differential arc oxidation, current density 7a/dm2,18 minutes conduction time under 400v pulse voltage；Differential arc oxidation After the completion of, foundry goods is taken out in power-off, washes off raffinate, and drying both can obtain top layer and be attached with one layer of fine and close al2o3Oxide-film Magnesium alloy for cabinet of speed changer foundry goods.
By specific embodiment above, described those skilled in the art can readily realize the present invention.But should Work as understanding, the present invention is not limited to above-mentioned several specific embodiments.On the basis of disclosed embodiment, described technology The technical staff in field can be combined different technical characteristics, thus realizing different technical schemes.

Claims (8)

1. a kind of manufacture method of the magnesium alloy for cabinet of speed changer of corrosion resistance is it is characterised in that this manufacture method step is as follows:
1) foam: from polystyrene as white mould foamed material, transmission case is manufactured using curing foam process pressure stamp Body bubbles model；
2) organize cluster: by every for described bubbles model two pieces group cluster, bonding pouring and riser systemses and impurity filtering net；
3) swabbing one: add Ludox and wetting agent to stir in agitator, then be slowly added zirconium English powder in bucket, even Continuous stirring prevents from luming, and adds defoamer mixing and stirring, mixing time 12 hours；The coating stirring one is uniformly brushed Painting bubbles model surfaces externally and internally 3 times, has often brushed a coating, and standing no coating goes to when dripping and uniformly spreads stone on special sander Sand, first pass granularity 100-120 mesh, second and third is less than 0.3% all over granularity 60-80 mesh, water content, and concentration is less than 0.3%；Standing and drying 12 hours, environment temperature 22-250C, relative humidity 60%, wind speed 3m/s；
4) swabbing two and hardening: add sodium silicate binder in agitator, be slowly added to mullite powder in whipping process, even Continuous stirring prevents from luming, mixing time 8 hours；The coating stirring two is uniformly brushed model surfaces externally and internally four times, often brush A complete coating, standing no coating goes to when dripping and uniformly spreads mullite sand on sander, is then immersed in liquor alumini chloridi Hardening 15 minutes, room temperature standing and drying 2 hours；After repetition aforesaid operations three times, not stucco after the 4th coating of brush；Quiet afterwards It is empty dry 4 hours, environment temperature 22-250C, relative humidity 60%, wind speed 3m/s；
5) roasting: the formwork being dried after hardening is pushed roasting in roaster, sintering temperature 10400C, roasting time 2 hours, roasting In formwork during burning, moisture fully evaporates, and foamed plastics ablation becomes carbon ash；After coming out of the stove when temperature is down to room temperature, by whole mould Carbon ash in shell is blown away, and obtains the formwork with sufficient intensity；
6) swabbing three: by the formwork immersion coating three after roasting, make the abundant dip-coating paint of formwork surfaces externally and internally three, then send It is dried to baking room, 12 hours time, environment temperature 430c；
7) smelting and pouring: one case two pieces is imbedded formwork in sandbox and shaken consolidation, then vacuumizes, makes pressure reach 0.03- 0.035mpa；Magnesium alloy ingot is smelted into molten metal and is poured into a mould into formwork, after cast, keep vacuum pressurize 10-15 to divide Clock, is poured, and sprinkles coverture on cup, unpacks, excises dead head, obtain foundry goods after solidification to be cooled；
8) differential arc oxidation: foundry goods deionized water is cleaned 2 minutes, anode aluminum steel is connected with foundry goods, corrosion resistant plate does negative electrode leaching Enter in electrolyte, under 380v-450v pulse voltage, carry out differential arc oxidation, current density 5-9a/dm2, conduction time 5-30 minute； After the completion of differential arc oxidation, foundry goods is taken out in power-off, washes off raffinate, dry both can obtain top layer be attached with one layer fine and close al2o3The magnesium alloy for cabinet of speed changer foundry goods of oxide-film.
2. a kind of magnesium alloy for cabinet of speed changer of corrosion resistance according to claim 1 manufacture method it is characterised in that In described step 3), wetting agent is sodium alkyl sulfonate, and defoamer is silicones, Ludox and wetting agent, zirconium English powder, defoamer Adding proportion be: 1kg Ludox add 1.6ml wetting agent add 3.4kg zirconium English powder add 1.2ml defoamer, stir gained Slurry viscosity 34-39 pa*s, zirconium English Powder Particle Size 320 mesh.
3. a kind of magnesium alloy for cabinet of speed changer of corrosion resistance according to claim 1 manufacture method it is characterised in that In described step 4), the adding proportion of waterglass and mullite powder is: 1kg waterglass adds 1.4kg mullite powder, mullite powder Granularity 320 mesh, stir resulting material viscosity 9-14 pa*s.
4. a kind of magnesium alloy for cabinet of speed changer of corrosion resistance according to claim 1 manufacture method it is characterised in that Three times mullite sand, first pass mullite fineness of sand 30-60 mesh is spread, second and third is all over mullite fineness of sand in described step 4) 10-30 mesh.
5. a kind of magnesium alloy for cabinet of speed changer of corrosion resistance according to claim 1 manufacture method it is characterised in that In described step 6), the composition of coating three is the mixed slurry of nanometer aluminium powder and Kaolin binder, mixed slurry viscosity 25- 30 pa*s.
6. a kind of magnesium alloy for cabinet of speed changer of corrosion resistance according to claim 1 manufacture method it is characterised in that Coverture in described step 7) is the mixture of villaumite and villiaumite.
7. a kind of magnesium alloy for cabinet of speed changer of corrosion resistance according to claim 6 manufacture method it is characterised in that Described villaumite is mgcl2Or kcl, villiaumite is caf2.
8. a kind of magnesium alloy for cabinet of speed changer of corrosion resistance according to claim 1 manufacture method it is characterised in that In described step 8), bath composition is: 45-50g/l calgon, 6-12g/l NaOH, adds suitable quantity of water stirring Uniformly, ph value controls in 7-9.
CN201410715922.0A 2014-12-02 2014-12-02 Manufacturing method of magnesium alloy transmission box with corrosion resistance Active CN104455349B (en)

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Application Number Priority Date Filing Date Title
CN201410715922.0A CN104455349B (en) 2014-12-02 2014-12-02 Manufacturing method of magnesium alloy transmission box with corrosion resistance

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CN104455349A CN104455349A (en) 2015-03-25
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CN107225220A (en) * 2017-05-23 2017-10-03 吉林工程技术师范学院 A kind of manufacture method of the magnesium alloy for cabinet of speed changer of superpower corrosion resistance
CN107127299B (en) * 2017-05-24 2018-05-18 吉林省维尔特隧道装备有限公司 A kind of high abrasion TBM development machines perching knife production method
CN107900286B (en) * 2017-12-04 2019-05-17 东方电气集团东方汽轮机有限公司 A kind of fused quartz ceramic shell preparation method

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