CN104805485A - Surface treatment method for die-cast aluminum alloy - Google Patents
Surface treatment method for die-cast aluminum alloy Download PDFInfo
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- CN104805485A CN104805485A CN201510164391.5A CN201510164391A CN104805485A CN 104805485 A CN104805485 A CN 104805485A CN 201510164391 A CN201510164391 A CN 201510164391A CN 104805485 A CN104805485 A CN 104805485A
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Abstract
The invention discloses a surface treatment method for a die-cast aluminum alloy, and relates to the technical field of metal surface treatment. The surface treatment method comprises the following steps: S10, conducting polishing treatment on the die-cast aluminum alloy; S20, conducting sand-blast treatment on the polished die-cast aluminum alloy; S30, conducting anode oxidation treatment on the sand-blasted die-cast aluminum alloy, so that an oxidation film layer is formed in the surface of the sand-blasted die-cast aluminum alloy; S40, conducting dyeing treatment on the oxidized die-cast aluminum alloy; S50, conducting plugging treatment on the dyed die-cast aluminum alloy. According to the surface treatment method, the problems that the die-cast metal structure is non-uniform, black spots are easy to generate, and the anode oxidation treatment cannot be conducted because the conventional die-cast aluminum alloy contains metal ingredients such as silicon, copper and iron are solved, and die-cast aluminum alloy products with various metal appearance effects can be obtained.
Description
Technical field
The present invention relates to field of metal surface treatment technology, particularly relate to a kind of aluminium diecast alloy surface treatment method.
Background technology
Anodic oxidation be Aluminum-aluminum alloy under corresponding electrolytic solution and specific process conditions, due under the effect of impressed current, in the upper process forming layer oxide film of aluminum products (anode), be a kind of process for treating surface of maturation.At present, be applied in aluminium alloy plate section product in the anodic oxidation treatment seen on the market more, and the die casting of aluminium is applied comparatively extensive recently, as products such as scatterer and automobile fasteners, but the metal ingredient such as copper, silicon, iron contained due to aluminium alloy compression casting material makes the metal structure heterogeneity of die casting, and easily produce blackout or occur blackspot and can not anodised problem, have impact on the metal appearance diversity of aluminium diecast alloy.
Based on the above, need a kind of new aluminium diecast alloy surface treatment method badly, the metal structure heterogeneity of die casting is made to solve existing aluminium diecast alloy because of the metal ingredient such as siliceous, copper, iron, and easily produce blackspot and anodic oxidation treatment can not be carried out, have impact on the problems such as the metal appearance diversity of aluminium diecast alloy.
Summary of the invention
The object of the invention is to propose a kind of aluminium diecast alloy surface treatment method, this aluminium diecast alloy surface treatment method solves existing aluminium diecast alloy because of the metal ingredient such as siliceous, copper, iron and makes the metal structure heterogeneity of die casting, and easily produce blackspot and the problem of anodic oxidation treatment can not be carried out, the aluminium diecast alloy product with diversity metal appearance effect can be obtained.
For reaching this object, the present invention by the following technical solutions:
The invention provides a kind of aluminium diecast alloy surface treatment method, said method comprising the steps of:
S10, aluminium diecast alloy is carried out grinding process;
S20, the aluminium diecast alloy after grinding process is carried out sandblasting;
S30, the aluminium diecast alloy after sandblasting is carried out anodic oxidation treatment, form oxidation film layer on aluminium diecast alloy surface;
S40, the aluminium diecast alloy after anodic oxidation treatment carried out dyeing process;
S50, by dyeing process after aluminium diecast alloy carry out sealing pores.
As a kind of preferred version, further comprising the steps of before step S30 after step S20:
S21, the aluminium diecast alloy after sandblasting is carried out electrochemical deoiling;
S22, degreasing is carried out to the aluminium diecast alloy after electrochemical deoiling;
S23, the aluminium diecast alloy after skimming treatment is carried out polished finish.
As a kind of preferred version, described aluminium diecast alloy is made at die casting aluminium surface-coated one deck aluminium alloy by hot-spraying techniques.
As a kind of preferred version, also comprise the aluminium diecast alloy after by degreasing after step s 22 before step S23 and carry out water-washing step.
As a kind of preferred version, after step S23, before step S30, also comprise the aluminium diecast alloy after by polishing carry out water-washing step.
As a kind of preferred version, described step S30 is specially: be placed in by the aluminium diecast alloy after sandblasting electrolytic solution to be housed and to lead to galvanic electrolyzer and carry out anodizing, described electrolytic solution adopts sulfuric acid, and voltage is 12-20V, and current density is 1-2A/dm
2, the reaction times is 15min-1h.
As a kind of preferred version, the thickness of described oxidation film layer is 3-30 μm.
As a kind of preferred version, described step S40 is specially: the aluminium diecast alloy after anodic oxidation treatment is carried out dyeing process by absorption dyeing or electrolytic coloring mode.
Beneficial effect of the present invention is:
The invention provides a kind of aluminium diecast alloy surface treatment method, the method comprises the following steps: S10, aluminium diecast alloy is carried out grinding process; S20, the aluminium diecast alloy after grinding process is carried out sandblasting; S30, the aluminium diecast alloy after sandblasting is carried out anodic oxidation treatment, form oxidation film layer on aluminium diecast alloy surface; S40, the aluminium diecast alloy after anodic oxidation treatment carried out dyeing process; S50, by dyeing process after aluminium diecast alloy carry out sealing pores.The invention solves existing aluminium diecast alloy because of the metal ingredient such as siliceous, copper, iron makes the metal structure heterogeneity of die casting, and easily produce blackspot and the problem of anodic oxidation treatment can not be carried out, the aluminium diecast alloy product with diversity metal appearance effect can be obtained.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the aluminium diecast alloy surface treatment method that the preferred embodiment of the present invention provides.
Embodiment
The technical problem solved for making the present invention, the technical scheme of employing and the technique effect that reaches are clearly, be described in further detail below in conjunction with the technical scheme of accompanying drawing to the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those skilled in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
This application provides a kind of aluminium diecast alloy surface treatment method, the method comprises the following steps:
S10, aluminium diecast alloy is carried out grinding process;
S20, the aluminium diecast alloy after grinding process is carried out sandblasting;
S30, the aluminium diecast alloy after sandblasting is carried out anodic oxidation treatment, form oxidation film layer on aluminium diecast alloy surface;
S40, the aluminium diecast alloy after anodic oxidation treatment carried out dyeing process;
S50, by dyeing process after aluminium diecast alloy carry out sealing pores.
The application polishes after carrying out spray treatment to aluminium diecast alloy again, sandblasting, anodic oxidation treatment, dyeing and sealing pores, efficiently solving existing aluminium diecast alloy because of the metal ingredient such as siliceous, copper, iron makes the metal structure heterogeneity of die casting, and easily produce blackspot and the problem of anodic oxidation treatment can not be carried out, finally obtaining the aluminium diecast alloy product with diversity metal appearance effect.
Present embodiments provide a kind of preferred aluminium diecast alloy surface treatment method, as shown in Figure 1, described method specifically comprises the following steps the flow process of this working method:
S10, aluminium diecast alloy is carried out grinding process.
In the present embodiment, preferably, described aluminium diecast alloy is made at die casting aluminium surface-coated one deck aluminium alloy by hot-spraying techniques.
Thermospray refer to trickle and dispersion metal or nonmetallic coated material, with one fusing or semi-molten state, deposit to a kind of through preparation matrix surface, form the technology of certain spray deposited layer.It utilizes certain thermal source (as electric arc, plasma spraying or combustion flame etc.) that Powdered or thread metal or non-metallic material are heated to melting or semi-melting state, then stay itself or pressurized air to be ejected into pretreated matrix surface with certain speed by flame, deposit and form a kind of technology with the top coat of various function.
Die casting aluminium is after hot-spraying techniques, and spray one deck aluminium alloy (this aluminium alloy can be 1 be-7 be aluminium alloy) at substrate surface, the thickness of aluminium alloy is 20-50um, its concrete numerical value visible product intensity and determining.
S20, the aluminium diecast alloy after grinding process is carried out sandblasting.
Sandblasting adopts pressurized air to be power, to processing die-cast aluminum alloy workpiece surface, the appearance of workpiece surface or shape changed material spray (copper ore, quartz sand, silicon carbide, iron sand, extra large sand) high-velocity jet to form high-velocity jet bundle.Because abrasive material is to the impact of workpiece surface and shear action, the surface of workpiece is made to obtain certain degree of cleaning and different roughness, the mechanical property of workpiece surface is improved, therefore, adopt sandblast technology process aluminium diecast alloy, the fatigue resistance of aluminium diecast alloy can be improved, aluminium diecast alloy with it after sticking power between the oxidation film layer that obtains through anodic oxidation treatment, the weather resistance of effective prolongation oxide film film, is also conducive to levelling and the decoration of coating.
S21, the aluminium diecast alloy after sandblasting is carried out electrochemical deoiling.
Electrochemical deoiling utilizes hot alkaline solution to the saponification of grease and emulsifying effect, and by the process that aluminium diecast alloy surface and oil contaminant removes, it has, and technique is simple, processing ease, with low cost, degreasing fluid is nontoxic, the feature such as nonflammable.Basic solution comprises two portions: a part is alkaline matter, as sodium hydroxide, sodium carbonate etc.; Another part is the surfactant such as water glass, emulsifying agent.The saponification removing saponifiable oil of alkaline matter, the emulsifying effect of tensio-active agent removes not saponifiable oil.
S22, degreasing is carried out to the aluminium diecast alloy after electrochemical deoiling.
In the present embodiment, carry out acid degreasing to the aluminium diecast alloy after electrochemical deoiling, the degreasing fluid adopted during acid degreasing is sulfuric acid, and sulfuric acid concentration is not limited to 15-25wt%.Aluminium diecast alloy is washed after degreasing again.
S23, the aluminium diecast alloy after skimming treatment is carried out polished finish.
In order to the aluminium diecast alloy obtaining anodic oxidation light just must carry out electropolishing or chemical rightenning to die casting.Chemical rightenning is a kind of method by chemical reagent, the selective dissolution effect in the uneven region of sample surfaces being eliminated to polishing scratch.Electropolishing utilizes metallic surface microcosmic salient point with under suitable current density in specific electrolytic solution, and the principle that first anode dissolution occurs carries out a kind of electrochemical machining method of polishing.Can need to select chemical rightenning or electropolishing according to reality processing.Aluminium diecast alloy is washed after polishing again.
S30, the aluminium diecast alloy after sandblasting is carried out anodic oxidation treatment, form oxidation film layer on aluminium diecast alloy surface.
In the present embodiment, preferably, the aluminium diecast alloy after sandblasting is placed in electrolytic solution is housed and leads to galvanic electrolyzer and carries out anodizing, form oxidation film layer on aluminium diecast alloy surface.Described electrolytic solution adopts sulfuric acid, and voltage is 12-20V, and current density is 1-2A/dm
2, the reaction times is 15min-1h.Preferably, the thickness of described oxidation film layer is 3-30 μm, and preferably, the thickness of described oxidation film layer is 8-12 μm, and its concrete numerical value can need the adjustment reaction times of anodic oxidation treatment, the concentration of electrolytic solution and current density etc. according to real work.
S40, the aluminium diecast alloy after anodic oxidation treatment carried out dyeing process.
In the present embodiment, preferably, aluminium diecast alloy after anodic oxidation treatment is carried out dyeing process by absorption dyeing (utilizing absorption principle to make dyestuff enter oxidation film layer by soaking) or electrolytic coloring mode, and dyeing time is 5-40min.
S50, by dyeing process after aluminium diecast alloy carry out sealing pores.
In the present embodiment, preferably, the aluminium diecast alloy after dyeing is transferred in sealing of hole groove and carries out sealing pores, carry out again afterwards washing and drying step finally obtains having the aluminium diecast alloy product of diversity metal appearance effect.Sealing pores also significantly improves the ability of the anti-abrasive wear of aluminium diecast alloy sprayed coating.
Surface manufacturing condition in the application is not limited to the surface treatment modes such as above-mentioned polishing, sandblasting, oil removing, degreasing, polishing and washing, can select other machine-shaping mode and surface treatment modes according to needs of production.
Below know-why of the present invention is described in conjunction with specific embodiments.These describe just in order to explain principle of the present invention, and can not be interpreted as limiting the scope of the invention by any way.Based on explanation herein, those skilled in the art does not need to pay performing creative labour can associate other embodiment of the present invention, and these modes all will fall within protection scope of the present invention.
Claims (8)
1. an aluminium diecast alloy surface treatment method, is characterized in that: said method comprising the steps of:
S10, aluminium diecast alloy is carried out grinding process;
S20, the aluminium diecast alloy after grinding process is carried out sandblasting;
S30, the aluminium diecast alloy after sandblasting is carried out anodic oxidation treatment, form oxidation film layer on aluminium diecast alloy surface;
S40, the aluminium diecast alloy after anodic oxidation treatment carried out dyeing process;
S50, by dyeing process after aluminium diecast alloy carry out sealing pores.
2. aluminium diecast alloy surface treatment method according to claim 1, is characterized in that: further comprising the steps of before step S30 after step S20:
S21, the aluminium diecast alloy after sandblasting is carried out electrochemical deoiling;
S22, degreasing is carried out to the aluminium diecast alloy after electrochemical deoiling;
S23, the aluminium diecast alloy after skimming treatment is carried out polished finish.
3. aluminium diecast alloy surface treatment method according to claim 1, is characterized in that: described aluminium diecast alloy is made at die casting aluminium surface-coated one deck aluminium alloy by hot-spraying techniques.
4. aluminium diecast alloy surface treatment method according to claim 2, is characterized in that: also comprise the aluminium diecast alloy after by degreasing after step s 22 before step S23 and carry out water-washing step.
5. aluminium diecast alloy surface treatment method according to claim 2, is characterized in that: after step S23, also comprise the aluminium diecast alloy after by polishing before step S30 carry out water-washing step.
6. the aluminium diecast alloy surface treatment method according to any one of claim 1-5, it is characterized in that: described step S30 is specially: the aluminium diecast alloy after sandblasting is placed in electrolytic solution is housed and leads to galvanic electrolyzer and carries out anodizing, described electrolytic solution adopts sulfuric acid, voltage is 12-20V, and current density is 1-2A/dm
2, the reaction times is 15min-1h.
7. aluminium diecast alloy surface treatment method according to claim 1, is characterized in that: the thickness of described oxidation film layer is 3-30 μm.
8. aluminium diecast alloy surface treatment method according to claim 1, is characterized in that: described step S40 is specially: the aluminium diecast alloy after anodic oxidation treatment is carried out dyeing process by absorption dyeing or electrolytic coloring mode.
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Application publication date: 20150729 |