CN104455349A - Manufacturing method of magnesium alloy transmission box with ultrahigh corrosion resistance - Google Patents

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

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Publication number
CN104455349A
CN104455349A CN201410715922.0A CN201410715922A CN104455349A CN 104455349 A CN104455349 A CN 104455349A CN 201410715922 A CN201410715922 A CN 201410715922A CN 104455349 A CN104455349 A CN 104455349A
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magnesium alloy
coating
corrosion resistance
formwork
cabinet
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CN201410715922.0A
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CN104455349B (en
Inventor
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)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mold Materials And Core Materials (AREA)
  • Other Surface Treatments For Metallic 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 magnesium alloy for cabinet of speed changer of superpower corrosion resistance
Technical field
The present invention relates to mission case manufacturing technology field, specifically a kind of manufacture method of magnesium alloy for cabinet of speed changer of superpower corrosion resistance.
Background technique
Magnesium alloy is as structural metallic materials the lightest at present, and its density is low, and specific strength, specific stiffness are high, and have good damping and amortization, damping performance is good.The fusing point of magnesium alloy is low, setting rate is fast, make it consume energy in casting technique low, fill type fast, castability is good, thermal conductivity and capability of electromagnetic shielding excellent, machinability is good, is described as the green engineering material in this century, at space flight, automobile, the fields such as electronics industry are widely used, such as gear box of automobile, cylinder head, wheel hub, seat support etc.Along with improving constantly of energy-conserving and environment-protective consciousness, automotive light weight technology demand is day by day urgent, the reduction of vehicle complete vehicle quality is the important means reducing fuel consume, under proof strength, rigidity requirement, magnesium alloy becomes automobile lightweight, improve the preferred material of environmental protection and energy saving, thus bring new power for magnesium alloy further developing of industrial field.But when magnesium-alloy material works in the environment exposed, easily oxidized, corrosion, particularly easily produces galvanic corrosion, stress corrosion etc. with during other metal parts assembly connections.Significantly reduce functional reliability and the working life of product, make the application level of magnesium-alloy material be subject to larger restriction.
Lost foam casting is that a kind of machining allowance is little, the casting method that casting accuracy is high.Its basic principle adopts to replace mold to carry out moulding with the identical foamed plastics of required cast shape, and bubbles model does not take out, and directly pours into molten metal and is vaporized thus makes molten metal form foundry goods.Mission case complex contour is changeable, adopts lost foam casting better can realize optimal box casting shape.But during traditional evaporative pattern casting magnesium alloy mission case, the cavity filling that the compound that foam pyrolysing gasification produces not only affects aluminium alloy can also be closely related with the defect of foundry goods, and pyrolysis product can react with aluminium alloy, change the composition proportion of aluminium alloy, affect the mechanical property of tank material, particularly magnesium alloy fused mass is comparatively strong to vapor sensitivity, and very easy air-breathing produces pore, causes empty class defect to produce.
Therefore, develop a kind of manufacture method that can manufacture the magnesium alloy for cabinet of speed changer with superpower anti-corrosion capacity to automobile lightweight, reduce fuel consume, expand the significant and economic value of the application scale of magnesium-alloy material.
Summary of the invention
Technical assignment of the present invention is to provide a kind of manufacture method of magnesium alloy for cabinet of speed changer of superpower corrosion resistance.
Technical assignment of the present invention realizes in the following manner, and this manufacture method step is as follows:
1) foam: select polystyrene as white mould foamed material, adopt slaking foam process pressure stamp to manufacture mission case bubbles model;
2) group bunch: by every for described bubbles model two pieces group bunch, bonding pouring and riser systems and impurity filtering net;
3) swabbing one: add Ludox and wetting agent stirs in agitating vessel, then zirconium English powder is slowly added in bucket, stir continuously and prevent caking, add defoamer mixing and stirring, mixing time 12 hours; The coating one stirred evenly is brushed bubbles model inner and outer surface 3 times, often brush a coating, leave standstill to forward on special sander when dripping without coating and evenly spread silica sand, first pass granularity 100-120 order, second and third is all over granularity 60-80 order, water content is less than 0.3%, and concentration is less than 0.3%; Standing and drying 12 hours, ambient temperature 22-25 0c, relative moisture 60%, wind speed 3m/s;
4) swabbing two and sclerosis: add sodium silicate binder in agitating vessel, slowly add mullite powder in whipping process, stirs continuously and prevents caking, mixing time 8 hours; The coating two that stirs evenly is brushed model inner and outer surface four times, has often brushed a coating, leave standstill to forward on sander when dripping without coating and evenly spread mullite sand, to be then immersed in liquor alumini chloridi sclerosis 15 minutes, room temperature standing and drying 2 hours; After repetition aforesaid operations three times, not stucco after brush the 4th coating; Leave standstill empty dry 4 hours afterwards, ambient temperature 22-25 0c, relative moisture 60%, wind speed 3m/s;
5) roasting: the formwork after drying being hardened pushes roasting in roasting oven, sintering temperature 1040 0c, roasting time 2 hours, in baking process, in formwork, moisture fully evaporates, and foamed plastics ablation becomes carbon ash; After coming out of the stove when temperature is down to room temperature, the carbon ash in whole formwork is blown away, obtains the formwork with sufficient intensity;
6) swabbing three: the formwork after roasting is immersed in coating three, makes the abundant dip-coating paint three of formwork inner and outer surface, then deliver to baking room inner drying, 12 hours time, ambient temperature 43 0c;
7) smelting and pouring: formwork is imbedded in sandbox and shaken consolidation by one case two pieces, then vacuumizes, and makes pressure reach 0.03-0.035MPa; Magnesium alloy ingot be smelted into molten metal and pour into a mould in formwork, keeping vacuum pressurize 10-15 minute after cast, be poured, pouring cup sprinkles covering agent, to be cooled solidify to unpack afterwards, excision cutting-off gate, obtain foundry goods;
8) differential arc oxidation: by foundry goods washed with de-ionized water 2 minutes, anode aluminum steel is connected with foundry goods, corrosion resistant plate does negative electrode and immerses in electrolytic solution, carries out differential arc oxidation, current density 5-9A/dm2 under 380V-450V pulsed voltage, current"on"time 5-30 minute; After differential arc oxidation completes, foundry goods is taken out in power-off, rinses and removes raffinate, dries and both can obtain the AL that top layer is attached with one deck densification 2o 3the magnesium alloy for cabinet of speed changer foundry goods of patina.
In described step 3), wetting agent is alkyl sodium sulfonate, defoamer is silicone, the adding proportion of Ludox and wetting agent, zirconium English powder, defoamer is: 1Kg Ludox adds 1.6ml wetting agent and adds 3.4Kg zirconium English powder and add 1.2ml defoamer, stir gained slurry viscosity 34-39 second, zirconium English Powder Particle Size 320 order.
In described step 4), the adding proportion of water glass and mullite powder is: 1Kg water glass adds 1.4Kg mullite powder, granularity 320 order of mullite powder, stirs gained material viscosity 9-14 second.
Spread three times mullite sand in described step 4), first pass mullite fineness of sand 30-60 order, second and third is all over mullite fineness of sand 10-30 order.
In described step 6), the composition of coating three is mixed slurries of nanometer aluminium powder and Kaolin binder, mixed slurry viscosity 25-30 second.
Covering agent in described step 7) is the mixture of villaumite and villiaumite.
Described villaumite is MgCl 2or KCl, villiaumite is CaF 2.
In described step 8), bath composition is: 45-50g/L sodium hexametaphosphate, 6-12g/L sodium hydroxide, and add proper amount of water and stir, pH value controls at 7-9.
The manufacture method of the magnesium alloy for cabinet of speed changer of a kind of superpower corrosion resistance of the present invention compared to the prior art, there is following characteristics: burnt by foamed plastics in advance in formwork baking process, avoid in casting process because foam high-temperature gasification is on the impact of casting quality, avoid the impact of carbon ash on magnesium alloy strength, ensure that the pure property of magnesium alloy materials; The aluminium powder of dip-coating before cast melts and is adhering closely to casting surface and forms complete aluminium protective film under the high temperature of casting process, forms fine and close Al in follow-up micro-arc oxidation process 2o 3patina, is closely wrapped in inside by magnesium alloy, substantially increases anti-oxidant, the corrosion resistance of magnesium alloy, solves the problem of mission case magnesium alloy oxidation and corrosion scarce capacity in light-weight design.
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: select polystyrene as white mould foamed material, adopt slaking foam process pressure stamp to manufacture mission case bubbles model;
2) group bunch: by every for described bubbles model two pieces group bunch, bonding pouring and riser systems and impurity filtering net;
3) swabbing one: add Ludox and alkyl sodium sulfonate stirs in agitating vessel, zirconium English powder is slowly added again in bucket, continuous stirring prevents caking, add silicone mixing and stirring, the adding proportion of mentioned component is: 1Kg Ludox adds 1.6ml alkyl sodium sulfonate, adds 3.4Kg granularity 320 object zirconium English powder, adds 1.2ml silicone, mixing time 12 hours, stirs gained slurry viscosity 34-39 second; The coating one that stirs evenly is brushed bubbles model inner and outer surface 3 times, has often brushed a coating, leave standstill to forward on special sander when dripping without coating and evenly spread silica sand, first pass granularity 120 order, second and third is all over granularity 80 order, and water content is less than 0.3%, and concentration is less than 0.3%; Standing and drying 12 hours, ambient temperature 25 0c, relative moisture 60%, wind speed 3m/s;
4) swabbing two and sclerosis: add sodium silicate binder in agitating vessel, slowly add granularity 320 object mullite powder in whipping process, adding proportion is: 1Kg water glass adds 1.4Kg mullite powder, stirs continuously and prevents caking, mixing time 8 hours, stirs gained material viscosity 14 seconds; The coating two that stirs evenly is brushed model inner and outer surface four times, has often brushed a coating, leave standstill to forward on sander when dripping without coating and evenly spread mullite sand, to be then immersed in liquor alumini chloridi sclerosis 15 minutes, room temperature standing and drying 2 hours; After repetition aforesaid operations three times, not stucco after brush the 4th coating, first three is all over first pass mullite fineness of sand 60 order in stucco, and second and third is all over mullite fineness of sand 30 order; Leave standstill empty dry 4 hours afterwards, ambient temperature 25 0c, relative moisture 60%, wind speed 3m/s;
5) roasting: the formwork after drying being hardened pushes roasting in roasting oven, sintering temperature 1040 0c, roasting time 2 hours, in baking process, in formwork, moisture fully evaporates, and foamed plastics ablation becomes carbon ash; After coming out of the stove when temperature is down to room temperature, the carbon ash in whole formwork is blown away, obtains the formwork with sufficient intensity;
6) swabbing three: immersed in coating three by the formwork after roasting, the composition of coating three is mixed slurries of nanometer aluminium powder and Kaolin binder, and adding proportion is: 1kg nanometer aluminium powder mixes with 10kg white clay, mixed slurry viscosity 30 seconds; Make the abundant dip-coating paint three of formwork inner and outer surface, then deliver to baking room inner drying, 12 hours time, ambient temperature 43 0c;
7) smelting and pouring: formwork is imbedded in sandbox and shaken consolidation by one case two pieces, then vacuumizes, and makes pressure reach 0.035MPa; Magnesium alloy ingot is smelted into molten metal and pours into a mould in formwork, keep vacuum pressurize 15 minutes after cast, be poured, pouring cup sprinkles covering agent, covering agent is MgCl 2and CaF 2mixture, to be cooled solidify rear unpack, excision cutting-off gate, obtain foundry goods;
8) differential arc oxidation: by foundry goods washed with de-ionized water 2 minutes, anode aluminum steel is connected with foundry goods, corrosion resistant plate does negative electrode and immerses in electrolytic solution, bath composition is: 48g/L sodium hexametaphosphate, 9g/L sodium hydroxide, adds proper amount of water and stirs, and pH value controls 8; Differential arc oxidation is carried out, current density 9A/dm2,30 minutes current"on"time under 450V pulsed voltage; After differential arc oxidation completes, foundry goods is taken out in power-off, rinses and removes raffinate, dries and both can obtain the AL that top layer is attached with one deck densification 2o 3the magnesium alloy for cabinet of speed changer foundry goods of patina.
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: select polystyrene as white mould foamed material, adopt slaking foam process pressure stamp to manufacture mission case bubbles model;
2) group bunch: by every for described bubbles model two pieces group bunch, bonding pouring and riser systems and impurity filtering net;
3) swabbing one: add Ludox and alkyl sodium sulfonate stirs in agitating vessel, zirconium English powder is slowly added again in bucket, continuous stirring prevents caking, add silicone mixing and stirring, the adding proportion of mentioned component is: 1Kg Ludox adds 1.6ml alkyl sodium sulfonate, adds 3.4Kg granularity 320 object zirconium English powder, adds 1.2ml silicone, mixing time 12 hours, stirs gained slurry viscosity 34-39 second; The coating one that stirs evenly is brushed bubbles model inner and outer surface 3 times, has often brushed a coating, leave standstill to forward on special sander when dripping without coating and evenly spread silica sand, first pass granularity 100 order, second and third is all over granularity 60 order, and water content is less than 0.3%, and concentration is less than 0.3%; Standing and drying 12 hours, ambient temperature 22 0c, relative moisture 60%, wind speed 3m/s;
4) swabbing two and sclerosis: add sodium silicate binder in agitating vessel, slowly add granularity 320 object mullite powder in whipping process, adding proportion is: 1Kg water glass adds 1.4Kg mullite powder, stirs continuously and prevents caking, mixing time 8 hours, stirs gained material viscosity 9 seconds; The coating two that stirs evenly is brushed model inner and outer surface four times, has often brushed a coating, leave standstill to forward on sander when dripping without coating and evenly spread mullite sand, to be then immersed in liquor alumini chloridi sclerosis 15 minutes, room temperature standing and drying 2 hours; After repetition aforesaid operations three times, not stucco after brush the 4th coating, first three is all over first pass mullite fineness of sand 30 order in stucco, and second and third is all over mullite fineness of sand 10 order; Leave standstill empty dry 4 hours afterwards, ambient temperature 22 0c, relative moisture 60%, wind speed 3m/s;
5) roasting: the formwork after drying being hardened pushes roasting in roasting oven, sintering temperature 1040 0c, roasting time 2 hours, in baking process, in formwork, moisture fully evaporates, and foamed plastics ablation becomes carbon ash; After coming out of the stove when temperature is down to room temperature, the carbon ash in whole formwork is blown away, obtains the formwork with sufficient intensity;
6) swabbing three: immersed in coating three by the formwork after roasting, the composition of coating three is mixed slurries of nanometer aluminium powder and Kaolin binder, and adding proportion is: 1kg nanometer aluminium powder mixes with 10kg white clay, mixed slurry viscosity 25 seconds; Make the abundant dip-coating paint three of formwork inner and outer surface, then deliver to baking room inner drying, 12 hours time, ambient temperature 43 0c;
7) smelting and pouring: formwork is imbedded in sandbox and shaken consolidation by one case two pieces, then vacuumizes, and makes pressure reach 0.03MPa; Magnesium alloy ingot is smelted into molten metal and pours into a mould in formwork, keep vacuum pressurize 10 minutes after cast, be poured, pouring cup sprinkles covering agent, covering agent is KCl and CaF 2mixture, to be cooled solidify rear unpack, excision cutting-off gate, obtain foundry goods;
8) differential arc oxidation: by foundry goods washed with de-ionized water 2 minutes, anode aluminum steel is connected with foundry goods, corrosion resistant plate does negative electrode and immerses in electrolytic solution, bath composition is: 50g/L sodium hexametaphosphate, 12g/L sodium hydroxide, adds proper amount of water and stirs, and pH value controls 9; Differential arc oxidation is carried out, current density 5A/dm2,5 minutes current"on"time under 380V pulsed voltage; After differential arc oxidation completes, foundry goods is taken out in power-off, rinses and removes raffinate, dries and both can obtain the AL that top layer is attached with one deck densification 2o 3the magnesium alloy for cabinet of speed changer foundry goods of patina.
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: select polystyrene as white mould foamed material, adopt slaking foam process pressure stamp to manufacture mission case bubbles model;
2) group bunch: by every for described bubbles model two pieces group bunch, bonding pouring and riser systems and impurity filtering net;
3) swabbing one: add Ludox and alkyl sodium sulfonate stirs in agitating vessel, zirconium English powder is slowly added again in bucket, continuous stirring prevents caking, add silicone mixing and stirring, the adding proportion of mentioned component is: 1Kg Ludox adds 1.6ml alkyl sodium sulfonate, adds 3.4Kg granularity 320 object zirconium English powder, adds 1.2ml silicone, mixing time 12 hours, stirs gained slurry viscosity 34-39 second; The coating one that stirs evenly is brushed bubbles model inner and outer surface 3 times, has often brushed a coating, leave standstill to forward on special sander when dripping without coating and evenly spread silica sand, first pass granularity 110 order, second and third is all over granularity 70 order, and water content is less than 0.3%, and concentration is less than 0.3%; Standing and drying 12 hours, ambient temperature 23 0c, relative moisture 60%, wind speed 3m/s;
4) swabbing two and sclerosis: add sodium silicate binder in agitating vessel, slowly add granularity 320 object mullite powder in whipping process, adding proportion is: 1Kg water glass adds 1.4Kg mullite powder, stirs continuously and prevents caking, mixing time 8 hours, stirs gained material viscosity 11 seconds; The coating two that stirs evenly is brushed model inner and outer surface four times, has often brushed a coating, leave standstill to forward on sander when dripping without coating and evenly spread mullite sand, to be then immersed in liquor alumini chloridi sclerosis 15 minutes, room temperature standing and drying 2 hours; After repetition aforesaid operations three times, not stucco after brush the 4th coating, first three is all over first pass mullite fineness of sand 50 order in stucco, and second and third is all over mullite fineness of sand 20 order; Leave standstill empty dry 4 hours afterwards, ambient temperature 24 0c, relative moisture 60%, wind speed 3m/s;
5) roasting: the formwork after drying being hardened pushes roasting in roasting oven, sintering temperature 1040 0c, roasting time 2 hours, in baking process, in formwork, moisture fully evaporates, and foamed plastics ablation becomes carbon ash; After coming out of the stove when temperature is down to room temperature, the carbon ash in whole formwork is blown away, obtains the formwork with sufficient intensity;
6) swabbing three: immersed in coating three by the formwork after roasting, the composition of coating three is mixed slurries of nanometer aluminium powder and Kaolin binder, and adding proportion is: 1kg nanometer aluminium powder mixes with 10kg white clay, mixed slurry viscosity 28 seconds; Make the abundant dip-coating paint three of formwork inner and outer surface, then deliver to baking room inner drying, 12 hours time, ambient temperature 43 0c;
7) smelting and pouring: formwork is imbedded in sandbox and shaken consolidation by one case two pieces, then vacuumizes, and makes pressure reach 0.032MPa; Magnesium alloy ingot is smelted into molten metal and pours into a mould in formwork, keep vacuum pressurize 13 minutes after cast, be poured, pouring cup sprinkles covering agent, covering agent is MgCl 2and CaF 2mixture, to be cooled solidify rear unpack, excision cutting-off gate, obtain foundry goods;
8) differential arc oxidation: by foundry goods washed with de-ionized water 2 minutes, anode aluminum steel is connected with foundry goods, corrosion resistant plate does negative electrode and immerses in electrolytic solution, bath composition is: 45g/L sodium hexametaphosphate, 6g/L sodium hydroxide, adds proper amount of water and stirs, and pH value controls 7; Differential arc oxidation is carried out, current density 7A/dm2,18 minutes current"on"time under 400V pulsed voltage; After differential arc oxidation completes, foundry goods is taken out in power-off, rinses and removes raffinate, dries and both can obtain the AL that top layer is attached with one deck densification 2o 3the magnesium alloy for cabinet of speed changer foundry goods of patina.
By embodiment above, described those skilled in the art can be easy to realize the present invention.But should be appreciated that the present invention is not limited to above-mentioned several embodiments.On the basis of disclosed mode of execution, described those skilled in the art can the different technical characteristics of combination in any, thus realizes different technological schemes.

Claims (8)

1. a manufacture method for the magnesium alloy for cabinet of speed changer of superpower corrosion resistance, is characterized in that, this manufacture method step is as follows:
1) foam: select polystyrene as white mould foamed material, adopt slaking foam process pressure stamp to manufacture mission case bubbles model;
2) group bunch: by every for described bubbles model two pieces group bunch, bonding pouring and riser systems and impurity filtering net;
3) swabbing one: add Ludox and wetting agent stirs in agitating vessel, then zirconium English powder is slowly added in bucket, stir continuously and prevent caking, add defoamer mixing and stirring, mixing time 12 hours; The coating one stirred evenly is brushed bubbles model inner and outer surface 3 times, often brush a coating, leave standstill to forward on special sander when dripping without coating and evenly spread silica sand, first pass granularity 100-120 order, second and third is all over granularity 60-80 order, water content is less than 0.3%, and concentration is less than 0.3%; Standing and drying 12 hours, ambient temperature 22-25 0c, relative moisture 60%, wind speed 3m/s;
4) swabbing two and sclerosis: add sodium silicate binder in agitating vessel, slowly add mullite powder in whipping process, stirs continuously and prevents caking, mixing time 8 hours; The coating two that stirs evenly is brushed model inner and outer surface four times, has often brushed a coating, leave standstill to forward on sander when dripping without coating and evenly spread mullite sand, to be then immersed in liquor alumini chloridi sclerosis 15 minutes, room temperature standing and drying 2 hours; After repetition aforesaid operations three times, not stucco after brush the 4th coating; Leave standstill empty dry 4 hours afterwards, ambient temperature 22-25 0c, relative moisture 60%, wind speed 3m/s;
5) roasting: the formwork after drying being hardened pushes roasting in roasting oven, sintering temperature 1040 0c, roasting time 2 hours, in baking process, in formwork, moisture fully evaporates, and foamed plastics ablation becomes carbon ash; After coming out of the stove when temperature is down to room temperature, the carbon ash in whole formwork is blown away, obtains the formwork with sufficient intensity;
6) swabbing three: the formwork after roasting is immersed in coating three, makes the abundant dip-coating paint three of formwork inner and outer surface, then deliver to baking room inner drying, 12 hours time, ambient temperature 43 0c;
7) smelting and pouring: formwork is imbedded in sandbox and shaken consolidation by one case two pieces, then vacuumizes, and makes pressure reach 0.03-0.035MPa; Magnesium alloy ingot be smelted into molten metal and pour into a mould in formwork, keeping vacuum pressurize 10-15 minute after cast, be poured, pouring cup sprinkles covering agent, to be cooled solidify to unpack afterwards, excision cutting-off gate, obtain foundry goods;
8) differential arc oxidation: by foundry goods washed with de-ionized water 2 minutes, anode aluminum steel is connected with foundry goods, corrosion resistant plate does negative electrode and immerses in electrolytic solution, carries out differential arc oxidation, current density 5-9A/dm2 under 380V-450V pulsed voltage, current"on"time 5-30 minute; After differential arc oxidation completes, foundry goods is taken out in power-off, rinses and removes raffinate, dries and both can obtain the AL that top layer is attached with one deck densification 2o 3the magnesium alloy for cabinet of speed changer foundry goods of patina.
2. the manufacture method of the magnesium alloy for cabinet of speed changer of a kind of superpower corrosion resistance according to claim 1, it is characterized in that, in described step 3), wetting agent is alkyl sodium sulfonate, defoamer is silicone, the adding proportion of Ludox and wetting agent, zirconium English powder, defoamer is: 1Kg Ludox adds 1.6ml wetting agent and adds 3.4Kg zirconium English powder and add 1.2ml defoamer, stir gained slurry viscosity 34-39 second, zirconium English Powder Particle Size 320 order.
3. the manufacture method of the magnesium alloy for cabinet of speed changer of a kind of superpower corrosion resistance according to claim 1, it is characterized in that, in described step 4), the adding proportion of water glass and mullite powder is: 1Kg water glass adds 1.4Kg mullite powder, granularity 320 order of mullite powder, stirs gained material viscosity 9-14 second.
4. the manufacture method of the magnesium alloy for cabinet of speed changer of a kind of superpower corrosion resistance according to claim 1, it is characterized in that, spread three times mullite sand in described step 4), first pass mullite fineness of sand 30-60 order, second and third is all over mullite fineness of sand 10-30 order.
5. the manufacture method of the magnesium alloy for cabinet of speed changer of a kind of superpower corrosion resistance according to claim 1, it is characterized in that, in described step 6), the composition of coating three is mixed slurries of nanometer aluminium powder and Kaolin binder, mixed slurry viscosity 25-30 second.
6. the manufacture method of the magnesium alloy for cabinet of speed changer of a kind of superpower corrosion resistance according to claim 1, is characterized in that, the covering agent in described step 7) is the mixture of villaumite and villiaumite.
7. the manufacture method of the magnesium alloy for cabinet of speed changer of a kind of superpower corrosion resistance according to claim 6, is characterized in that, described villaumite is MgCl 2or KCl, villiaumite is CaF 2.
8. the manufacture method of the magnesium alloy for cabinet of speed changer of a kind of superpower corrosion resistance according to claim 1, it is characterized in that, in described step 8), bath composition is: 45-50g/L sodium hexametaphosphate, 6-12g/L sodium hydroxide, add proper amount of water to stir, pH value controls at 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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CN107127299A (en) * 2017-05-24 2017-09-05 吉林省维尔特隧道装备有限公司 The high abrasion TBM development machine perching knife modes of production
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
CN107900286A (en) * 2017-12-04 2018-04-13 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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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
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CN107900286A (en) * 2017-12-04 2018-04-13 东方电气集团东方汽轮机有限公司 A kind of fused quartz ceramic shell preparation 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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