CN102758237B - High-corrosion-resistance surface treatment method of zinc alloy by hexavalent chrome color emulation - Google Patents
High-corrosion-resistance surface treatment method of zinc alloy by hexavalent chrome color emulation Download PDFInfo
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Abstract
The invention relates to a surface treatment method of a zinc alloy, particularly a high-corrosion-resistance surface treatment method of a zinc alloy by hexavalent chrome color emulation. The high-corrosion-resistance surface treatment method of a zinc alloy by hexavalent chrome color emulation comprises the following steps: carrying out ultrasonic paraffin-removal oil-removal treatment on a zinc alloy blank; carrying out anodic oxidation treatment on the treated zinc alloy blank; carrying out electrophoretic coating, water washing and baking on the zinc alloy blank; transferring the zinc alloy blank onto an ultraviolet (UV) curing painting line to spray a UV primer, leveling, and carrying out UV curing; after hanging the zinc alloy blank in a physical vapor deposition furnace to carry out plasma treatment, carrying out physical vapor deposition filming treatment; and transferring the treated zinc alloy blank onto the UV painting line to spray a UV-curing middle layer paint, leveling, carrying out UV curing, spraying a transparent UV finish coat, leveling, carrying out UV curing, and regulating the UV-curing middle layer paint to an electroplated hexavalent chrome metal color, thereby finishing the high-corrosion-resistance surface treatment of the zinc alloy by hexavalent chrome color emulation.
Description
Technical field
The present invention relates to a kind of surface treatment method of zinc alloy, especially relate to the surface treatment method of the high anti-corrosion imitative hexavalent chromium color of a kind of zinc alloy.
Background technology
Zinc alloy take zinc as the alloy that main body adds the oligo-element compositions such as aluminium, copper, magnesium, cadmium, lead, titanium.Zinc alloy fusing point is low, good fluidity, easy melting welding, soldering and plastic working.When in alloying constituent, lead impurity element, cadmium, tin are above standard, cause foundry goods aging and deform, showing as volume swells, and mechanical property particularly plasticity significantly declines, and the time has been grown and even broken.Lead, tin, cadmium solubleness in zinc alloy is very little, thus concentrates on grain boundary and becomes negative electrode, and the sosoloid of rich aluminium becomes anode, under water vapour (ionogen) existent condition, facilitates intergranular galvanic corrosion.Die casting is aging because of intergranular corrosion.Due to the poor chemical stability of zinc alloy, easily corroded in atmosphere, in strong acid, highly basic, all can be subject to strong etch, therefore the current object being reached protection against corrosion or decoration by plating electrolytic coating.Zinc alloy diecasting surface compact layer only has 0.05 ~ 0.1 μm, and zinc alloy diecasting hardness is low, just upper layer atresia, and the matrix under top layer mostly is loose and porous structure, top layer, once destroyed, will be exposed the internal layer that hole is more, cause difficulty to plating.In order to reach the good combination power between electrolytic coating and zinc alloy basis, need to adopt cyanide electroplating to be used as pre-plating layer, prussiate is very harmful to environment and the mankind's, has limited prussiate electroplating technology at present.
Chinese patent 200610167410 discloses a kind of Zinc-alloy and preparation method thereof, Zinc-alloy comprises the vacuum coating on zinc alloy base material and zinc alloy base material surface, wherein, these goods also comprise ultraviolet curable coating, and this ultraviolet curable coating is between zinc alloy base material and vacuum coating.Between the zinc alloy base material of the Zinc-alloy that this invention provides and vacuum coating, there is ultraviolet curable coating, this coating can reduce the surfaceness of zinc alloy base material effectively, and the sticking power of this coating and vacuum coating is also relatively good, the surface gloss of the Zinc-alloy obtained is higher.It is too thin to there is rete outermost layer (PVD layer) in the zinc alloy treatment process of this invention, wear resistance and the shortcoming such as solidity to corrosion is poor.
Chinese invention 200910166879 discloses a kind of filling closure of distant holes on surface of zinc die casting alloy and method for making thereof, and this filling is closed and comprised the single metal or alloy of fusing point lower than zinc alloy; This method for making imposes low melting point metal plating at the zinc alloy surface through de-cured, degreasing, de-oiling, after reaching target thickness, dry through rinsing, melt through anoxybiotic intensification table again, again through the processing procedure operation of quenching, the gas that zinc alloy is dredged in hole afterwards in intensification is discharged, and utilizing the infiltration of the surface tension of the surperficial low melting point metal coating of melting state to fill the thin hole of zinc alloy, recycling During Quenching reduces alloy crystal formation size, reinforced structure intensity, increases the stopping property of workpiece surface, avoids the regeneration in thin hole.The zinc alloy material blank method for sealing more complicated of this invention, and adopt metal to carry out sealing of hole, lifting is not activated to the solidity to corrosion of of zinc alloy itself.
Chinese patent 200710182088 discloses a kind of surface treatment method of alloy material, and the method comprises alloy material and carries out electrophoretic painting, it is characterized in that, the method before being also included in electrophoretic painting first alloy material carry out anodic oxidation.Erosion resistance and the sticking power of the rete of the surface formation of the alloy material after the surface treatment method process of the alloy material that this invention provides after oil paint coating are better.But its outward appearance cannot reach water power plates color required by 6 valency chromium.
Summary of the invention
The shortcoming that the object of the invention is to exist in the process of surface treatment for existing zinc alloy, with not enough, provides the surface treatment method of the high anti-corrosion imitative hexavalent chromium color of a kind of zinc alloy.
The present invention includes following steps:
1) zinc alloy blank is carried out ultrasonic wave paraffin removal oil removal treatment;
2) anodic oxidation treatment is carried out to the zinc alloy blank through step 1) process;
3) to through step 2) the zinc alloy blank that processes carries out electrophoretic painting, washing, drying and processing;
4) proceed on ultraviolet light polymerization (UV) painting line the zinc alloy blank through step 3) process and carry out spray UV priming paint, levelling, UV solidify;
5) to being linked into after physical vapor deposition (PVD) stove carries out Cement Composite Treated by Plasma through the zinc alloy blank of step 4) process, physical vapor deposition coating film process is carried out;
6) the zinc alloy blank through step 5) process is proceeded on UV painting line carry out spray ultraviolet light polymerization (UV) intermediate layer paint, levelling, UV solidify, spray transparent UV finish paint again, levelling, UV solidifies, and in ultraviolet light polymerization (UV) intermediate layer paint, mix the color of plating 6 valency chromium metal, complete the surface treatment of the high anti-corrosion imitative hexavalent chromium color of zinc alloy.
In step 1), the described ultrasonic formula except Lasaxing Oilfield can adopt paraffin removal formula well known in the art, and as company limited's paraffin removal liquid formula is floated in Guangdong three: wax removing agent SF-20420 ~ 40ml/L, all the other are pure water, except wax liquid temperature is 55 ~ 65 DEG C, the time is 3 ~ 5min; The formula of ultrasonic oil removal liquid can adopt Na
3pO
48 ~ 12g/L, K
2cO
320 ~ 30g/L, all the other are pure water, and degreasing fluid temperature is 55 ~ 65 DEG C, and the time is 1 ~ 2min.
In step 2) in, described zinc alloy blank carries out anodic oxidation treatment, and the formula of anodizing liquid can adopt sodium hydroxide 15 ~ 20g/L, temperature 40 ~ 45 DEG C, time 5 ~ 8min, current density 6 ~ 12A/dm
2.
In step 3), the processing condition of described electrophoretic painting can be: electrophoresis liquid composition: the PPG-EC-1800 electrocoating paint of PPG company of the U.S., the massfraction 9% ~ 12% of the organic solid in this electrocoating paint, distilled water massfraction 88% ~ 91%; Voltage: 30 ~ 60V; Time: 1.5 ~ 2.5min; The condition of described washing can be rinsing 1 ~ 2min in de-ionized water tank; The condition of described drying and processing can be dries 40 ~ 60min at 150 ~ 170 DEG C of temperature.
In step 4), described spray UV priming paint, the concrete grammar of levelling, UV solidification can be: after spraying plating one deck UV paints (thick 15 ~ 30 μm of enamelled coating), send into infrared baking section, after carrying out levelling, at 50 ~ 70 DEG C, dry 3 ~ 10min, then send into ultraviolet photo-curing section and carry out UV and irradiate curing cross-linked 10 ~ 45s, the energy that UV irradiates solidification is 500 ~ 1000mJ/cm
2, UV paint is urethane acrylate class UV coating.
In step 5), the processing condition of described Cement Composite Treated by Plasma can be ion source electric current 0.3 ~ 0.5A, bias voltage 80 ~ 150V, dutycycle 50% ~ 80%, argon gas flow velocity 10 ~ 100SCCM, oxygen gas flow rate 10 ~ 150SCCM, vacuum pressure 0.1 ~ 0.4Pa in stove, soak time 5 ~ 10min, to reach the object of activating surface; The processing condition of described physical vapor deposition coating film process can be and adopt high-power medium-frequency pulse or high-power DC power supply, and supply current is 50 ~ 300A, and voltage is 400 ~ 800V, depositing time is 0.5 ~ 10min, bias voltage 20 ~ 60V, dutycycle 50% ~ 80%, argon gas flow velocity 60 ~ 200SCCM; The target that physical vapor deposition coating film adopts can be at least one in the metals such as chromium, indium, tin, antimony, silver.
In step 6), described spray ultraviolet light polymerization (UV) intermediate layer paint, the concrete grammar of levelling, UV solidification can be: after spraying plating one deck UV paints (thick 5 ~ 10 μm of enamelled coating), send into infrared baking section, after carrying out levelling, at 50 ~ 70 DEG C, dry 3 ~ 10min, then send into ultraviolet photo-curing section and carry out UV and irradiate curing cross-linked 10 ~ 45s, the energy that UV irradiates solidification is 500 ~ 1000mJ/cm
2; UV paint for urethane acrylate class UV coating, and adds toning agent and mixes colours; Described spray UV finish paint, the concrete grammar of levelling, UV solidification can be: after spraying plating one deck UV paints (thick 15 ~ 25 μm of enamelled coating), send into infrared baking section, after carrying out levelling, 3 ~ 10min is dried at 50 ~ 70 DEG C, send into ultraviolet photo-curing section again and carry out UV irradiation curing cross-linked 10 ~ 45s, the energy that UV irradiates solidification is 500 ~ 1000mJ/cm
2, UV paint is urethane acrylate class UV coating.
The present invention does not adopt the plating of prussiate to improve the bonding force between base material and coating, but adopts anodic oxidation and electrophoretic technique to ensure that the high anti-corrosion of zinc alloy, the bonding force between coating and base material and high-decoration appearance requirement.
Compared with existing zinc alloy surface treatment technology, the present invention has the following advantages:
1) whole technical process adopts the surface treatment method of environmental protection to process, and does not have the plating of prussiate, decreases the harm of pollution to environment and the mankind.
2) have employed anodic oxidation and the electrophoretic painting process of zinc alloy, ensure that the high anti-corrosion requirement of zinc alloy.
3) the zinc alloy product color adopting the present invention to produce and existing water power plate 6 valency chromium solid colours.
5) the anti-solidity to corrosion of the zinc alloy product adopting the present invention to produce is high, and CASS is by 16h, and hot quenching is by 150 DEG C of tests.
Embodiment
The present invention is further illustrated for following examples.
Embodiment 1
Embodiment 1 is used for illustrating the surface treatment method of the high anti-corrosion imitative hexavalent chromium color of a kind of zinc alloy of the present invention.
(1) adopt polished zinc alloy blank employing ultrasonic wave paraffin removal, its technical recipe is: the wax removing agent SF-204 20ml/L that Guangdong three is floating, temperature 65 DEG C, time 5min; Ultrasonic oil removal concrete grammar can adopt Na
3pO
48g/L, K
2cO
330g/L, temperature 65 DEG C, time 1min.
(2) then carry out anodic oxidation treatment, technical recipe can adopt sodium hydroxide 15g/L, temperature 45 C, time 8min, current density 6A/dm2.After 2 road rinsed with deionized water 1min, electrophoretic painting is carried out again after anodic oxidation treatment process.Electrophoresis coating technique formula can adopt bath composition: U.S. PPG company PPG-EC-1800 electrocoating paint, solid divides massfraction 9%, distilled water massfraction 91%.Voltage: 30V; Time: 2.5min.In de-ionized water tank, carry out drying and processing after rinsing 2min after electrophoretic painting, drying and processing technique for dry 60min at 150 DEG C of temperature.
(3) zinc alloy blank is turned linked to put on UV painting line and carry out spray UV priming paint, after spraying plating one deck UV paints (thick about 30 μm of enamelled coating), send into infrared baking section, carry out levelling, oven dry (70 DEG C × 3min), send into ultraviolet photo-curing section after levelling, oven dry and carry out UV irradiation curing cross-linked (time 10s), it is 1000mJ/cm that UV irradiates the energy solidified
2.UV paint is urethane acrylate class UV coating.
(4) zinc alloy blank is gone from UV painting line, turn linked to, be linked into PVD stove and carry out Cement Composite Treated by Plasma, the processing condition of Cement Composite Treated by Plasma can be ion source electric current 0.5A, bias voltage 80V, dutycycle 50%, argon gas flow velocity 100SCCM, oxygen gas flow rate 10SCCM, vacuum pressure 0.3Pa in stove, soak time 10min, to reach the object of activating surface; The processing condition of described PVD plated film can be employing high-power DC power supply, and electric current is 50A, and voltage is 400V, and depositing time is 10min, bias voltage 60V, dutycycle 50%, argon gas flow velocity 60SCCM.The target that PVD plated film adopts can be pure chromium.
(5) zinc alloy blank is taken out from PVD stove, carry out turning linked to, proceeding on UV painting line and carry out painting in spray UV, after spray one deck UV paint (thick about 5 μm of enamelled coating), send into infrared baking section, carry out levelling, oven dry (50 DEG C × 10min), send into ultraviolet photo-curing section after levelling, oven dry and carry out UV irradiation curing cross-linked (time 10s), it is 500mJ/cm that UV irradiates the energy solidified
2.UV paint for urethane acrylate class UV coating, and adds toning agent and mixes colours, and mixes the color of plating 6 valency chromium metal.And then carry out spray UV finish paint, after spray one deck UV paint (thick about 25 μm of enamelled coating), send into infrared baking section, carry out levelling, oven dry (70 DEG C × 3min), send into ultraviolet photo-curing section after levelling, oven dry and carry out UV irradiation curing cross-linked (time 45s), it is 500mJ/cm that UV irradiates the energy solidified
2.UV paint is urethane acrylate class UV coating.
With reference to the standard of bathroom, following testing standard is carried out to zinc alloy environmental protection full-dry method product and tests:
1.CASS (anti corrosion test ASTM B368-09)-----16h;
2.AASS (SaltSprayTest ASTM G85-9)--------96h;
3. cold cycling test (ASME A112.18.1-2005/CSA B125.1-05)---4cycles;
4. knockout test (ASTM D968-09, Method A)-----12liter;
5. water logging test (ASTM D870-02)--------38 ± 2 DEG C × 24h;
6. chemical resistant properties test (ASTM D1308-02)--------Na OH 6mol/L;
7. pencil hardness (ASTM D3363-05)----Chinese pencil 2H;
8. hundred cut test (ASTM D3359-09)------more than 3B;
9. hot quenching test (ASTM B 571)--------150 DEG C.
Result is as follows: 1.CASS 16h OK; 2.AASS96h OK; 3. cold cycling test OK; 4. knockout test OK; 5. water logging test OK, does not have colour-change; 6. chemical resistant properties test OK; 7. pencil hardness China pencil 5H; 8. hundred cut test 5B; 9. hot quenching test OK, the phenomenon such as bubble-free, peeling occurs.
Embodiment 2
(1) adopt polished zinc alloy blank employing ultrasonic wave paraffin removal, its technical recipe is: the wax removing agent SF-20440ml/L that Guangdong three is floating, temperature 55 DEG C, time 3min; Ultrasonic oil removal concrete grammar can adopt Na
3pO
48g/L, K
2cO
330g/L, temperature 55 DEG C, time 1min.
(2) then carry out anodic oxidation treatment, technical recipe can adopt sodium hydroxide 20g/L, temperature 45 C, time 5min, current density 6A/dm2.After 2 road rinsed with deionized water 1min, electrophoretic painting is carried out again after anodic oxidation treatment process.Electrophoresis coating technique formula can adopt bath composition: U.S. PPG company PPG-EC-1800 electrocoating paint, solid divides massfraction 12%, distilled water massfraction 88%.Voltage: 60V; Time: 1.5min.In de-ionized water tank, carry out drying and processing after rinsing 1min after electrophoretic painting, drying and processing technique for dry 40min at 170 DEG C of temperature.
(3) zinc alloy blank is turned linked to put on UV painting line and carry out spray UV priming paint, after spraying plating one deck UV paints (thick 15 μm of enamelled coating), send into infrared baking section, carry out levelling, oven dry (50 DEG C × 10min), send into ultraviolet photo-curing section after levelling, oven dry and carry out UV irradiation curing cross-linked (time 45s), it is 500mJ/cm that UV irradiates the energy solidified
2.UV paint is urethane acrylate class UV coating.
(4) zinc alloy blank is gone from UV painting line, turn linked to, be linked into PVD stove and carry out Cement Composite Treated by Plasma, the processing condition of Cement Composite Treated by Plasma can be ion source electric current 0.3A, bias voltage 150V, dutycycle 80%, argon gas flow velocity 10SCCM, oxygen gas flow rate 100SCCM, vacuum pressure 0.3Pa in stove, soak time 5min, to reach the object of activating surface; The processing condition of described PVD plated film can be and adopt high-power intermediate frequency power supply, and electric current is 300A, and voltage is 800V, and depositing time is 0.5min, bias voltage 20V, dutycycle 80%, argon gas flow velocity 200SCCM.The target that PVD plated film adopts can be fine silver.
(5) zinc alloy blank is taken out from PVD stove, carry out turning linked to, proceeding on UV painting line and carry out painting in spray UV, after spray one deck UV paint (thick about 10 μm of enamelled coating), send into infrared baking section, carry out levelling, oven dry (70 DEG C × 3min), send into ultraviolet photo-curing section after levelling, oven dry and carry out UV irradiation curing cross-linked (time 45s), it is 1000mJ/cm that UV irradiates the energy solidified
2.UV paint for urethane acrylate class UV coating, and adds toning agent and mixes colours, and mixes the color of plating 6 valency chromium metal.And then carry out spray UV finish paint, after spray one deck UV paint (thick about 15 μm of enamelled coating), send into infrared baking section, carry out levelling, oven dry (50 DEG C × 10min), send into ultraviolet photo-curing section after levelling, oven dry and carry out UV irradiation curing cross-linked (time 10s), it is 1000mJ/cm that UV irradiates the energy solidified
2.UV paint is urethane acrylate class UV coating.
With reference to the standard of bathroom, following testing standard is carried out to zinc alloy environmental protection full-dry method product and tests:
1.CASS (anti corrosion test ASTM B368-09)-----16h;
2.AASS (SaltSprayTest ASTM G85-9)--------96h;
3. cold cycling test (ASME A112.18.1-2005/CSAB125.1-05)---4cycles;
4. knockout test (ASTM D968-09, Method A)-----12liter;
5. water logging test (ASTM D870-02)--------38 ± 2 DEG C × 24h;
6. chemical resistant properties test (ASTM D1308-02)--------Na OH6mol/L;
7. pencil hardness (ASTM D3363-05)----Chinese pencil 2H;
8. hundred cut test (ASTM D3359-09)------more than 3B;
9. hot quenching test (ASTM B571)--------150 DEG C.
Result is as follows: 1.CASS 16h OK; 2.AASS 96h OK; 3. cold cycling test OK; 4. knockout test OK; 5. water logging test OK, does not have colour-change; 6. chemical resistant properties test OK; 7. pencil hardness China pencil 4H; 8. hundred cut test 5B; 9. hot quenching test OK, the phenomenon such as bubble-free, peeling occurs.
Embodiment 3
(1) adopt polished zinc alloy blank employing ultrasonic wave paraffin removal, its technical recipe is: the wax removing agent SF-204 30ml/L that Guangdong three is floating, temperature 60 C, time 4min; Ultrasonic oil removal concrete grammar can adopt Na
3pO
410g/L, K
2cO
325g/L, temperature 60 C, time 1.5min.
(2) then carry out anodic oxidation treatment, technical recipe can adopt sodium hydroxide 18g/L, temperature 42 DEG C, time 6min, current density 8A/dm2.After 2 road rinsed with deionized water 1.5min, electrophoretic painting is carried out again after anodic oxidation treatment process.Electrophoresis coating technique formula can adopt bath composition: U.S. PPG company PPG-EC-1800 electrocoating paint, solid divides massfraction 10%, distilled water massfraction 90%.Voltage: 50V; Time: 2min.In de-ionized water tank, carry out drying and processing after rinsing 1.5min after electrophoretic painting, drying and processing technique for dry 50min at 160 DEG C of temperature.
(3) zinc alloy blank is turned linked to put on UV painting line and carry out spray UV priming paint, after spraying plating one deck UV paints (thick 20 μm of enamelled coating), send into infrared baking section, carry out levelling, oven dry (60 DEG C × 7min), send into ultraviolet photo-curing section after levelling, oven dry and carry out UV irradiation curing cross-linked (time 30s), it is 800mJ/cm that UV irradiates the energy solidified
2.UV paint is urethane acrylate class UV coating.
(4) zinc alloy blank is gone from UV painting line, turn linked to, be linked into PVD stove and carry out Cement Composite Treated by Plasma, the processing condition of Cement Composite Treated by Plasma can be ion source electric current 0.4A, bias voltage 100V, dutycycle 60%, argon gas flow velocity 50SCCM, oxygen gas flow rate 10SCCM, vacuum pressure 0.1Pa in stove, soak time 6min, to reach the object of activating surface; The processing condition of described PVD plated film can be employing high-power DC power supply, and electric current is 100A, and voltage is 500V, and depositing time is 2min, bias voltage 40V, dutycycle 60%, argon gas flow velocity 100SCCM.The target that PVD plated film adopts can be star antimony.
(5) zinc alloy blank is taken out from PVD stove, carry out turning linked to, proceeding on UV painting line and carry out painting in spray UV, after spray one deck UV paint (thick about 8 μm of enamelled coating), send into infrared baking section, carry out levelling, oven dry (60 DEG C × 5min), send into ultraviolet photo-curing section after levelling, oven dry and carry out UV irradiation curing cross-linked (time 30s), it is 800mJ/cm that UV irradiates the energy solidified
2.UV paint for urethane acrylate class UV coating, and adds toning agent and mixes colours, and mixes the color of plating 6 valency chromium metal.And then carry out spray UV finish paint, after spray one deck UV paint (thick about 10 μm of enamelled coating), send into infrared baking section, carry out levelling, oven dry (60 DEG C × 15min), send into ultraviolet photo-curing section after levelling, oven dry and carry out UV irradiation curing cross-linked (time 30s), it is 800mJ/cm that UV irradiates the energy solidified
2.UV paint is urethane acrylate class UV coating.
With reference to the standard of bathroom, following testing standard is carried out to zinc alloy environmental protection full-dry method product and tests:
1.CASS (anti corrosion test ASTM B368-09)-----16h;
2.AASS (SaltSprayTest ASTM G85-9)--------96h;
3. cold cycling test (ASME A112.18.1-2005/CSA B125.1-05)---4cycles;
4. knockout test (ASTM D968-09, Method A)-----12liter;
5. water logging test (ASTM D870-02)--------38 ± 2 DEG C × 24h;
6. chemical resistant properties test (ASTM D1308-02)--------Na OH6mol/L;
7. pencil hardness (ASTM D3363-05)---Chinese pencil 2H;
8. hundred cut test (ASTM D3359-09)------more than 3B;
9. hot quenching test (ASTM B571)--------150 DEG C.
Result is as follows: 1.CASS 16h OK; 2.AASS 96h OK; 3. cold cycling test OK; 4. knockout test OK; 5. water logging test OK, does not have colour-change; 6. chemical resistant properties test OK; 7. pencil hardness China pencil 6H; 8. hundred cut test 5B; 9. hot quenching test OK, the phenomenon such as bubble-free, peeling occurs.
Claims (2)
1. a surface treatment method for the high anti-corrosion imitative hexavalent chromium color of zinc alloy, is characterized in that comprising the following steps:
1) zinc alloy blank is carried out ultrasonic wave paraffin removal oil removal treatment; The formula of described ultrasonic oil removal liquid adopts Na
3pO
48 ~ 12g/L, K
2cO
320 ~ 30g/L, all the other are pure water, and degreasing fluid temperature is 55 ~ 65 DEG C, and the time is 1 ~ 2min;
2) to through step 1) the zinc alloy blank that processes carries out anodic oxidation treatment; Described zinc alloy blank carries out anodic oxidation treatment, and the formula of anodizing liquid adopts sodium hydroxide 15 ~ 20g/L, temperature 40 ~ 45 DEG C, time 5 ~ 8min, current density 6 ~ 12A/dm
2;
3) to through step 2) the zinc alloy blank that processes carries out electrophoretic painting, washing, drying and processing; The processing condition of described electrophoretic painting are: electrophoresis liquid composition: the PPG-EC-1800 electrocoating paint of PPG company of the U.S., the massfraction 9% ~ 12% of the organic solid in this electrocoating paint, distilled water massfraction 88% ~ 91%; Voltage: 30 ~ 60V; Time: 1.5 ~ 2.5min;
4) to through step 3) the zinc alloy blank that processes proceeds on ultraviolet light polymerization painting line and carries out spray UV priming paint, and levelling, UV solidify; Described spray UV priming paint, the concrete grammar of levelling, UV solidification is: after spraying plating one deck UV paints, send into infrared baking section, after carrying out levelling, 3 ~ 10min is dried at 50 ~ 70 DEG C, send into ultraviolet photo-curing section again and carry out UV irradiation curing cross-linked 10 ~ 45s, the energy that UV irradiates solidification is 500 ~ 1000mJ/cm
2, UV paint is urethane acrylate class UV coating;
5) to through step 4) the zinc alloy blank that processes is linked into after physical vapor deposition stove carries out Cement Composite Treated by Plasma, carries out physical vapor deposition coating film process; The processing condition of described Cement Composite Treated by Plasma are ion source electric current 0.3 ~ 0.5A, bias voltage 80 ~ 150V, dutycycle 50% ~ 80%, argon gas flow velocity 10 ~ 100SCCM, oxygen gas flow rate 10 ~ 150SCCM, vacuum pressure 0.1 ~ 0.4Pa in stove, soak time 5 ~ 10min; The processing condition of described physical vapor deposition coating film process are for adopting high-power medium-frequency pulse or high-power DC power supply, and supply current is 50 ~ 300A, and voltage is 400 ~ 800V, depositing time is 0.5 ~ 10min, bias voltage 20 ~ 60V, dutycycle 50% ~ 80%, argon gas flow velocity 60 ~ 200SCCM; The target that physical vapor deposition coating film adopts is at least one in chromium, indium, tin, antimony, silver metal;
6) to through step 5) the zinc alloy blank that processes proceeds on UV painting line and carries out spray ultraviolet light polymerization intermediate layer paint, levelling, UV solidify, spray transparent UV finish paint again, levelling, UV solidifies, and in ultraviolet light polymerization intermediate layer paint, mix the color of plating 6 valency chromium metal, complete the surface treatment of the high anti-corrosion imitative hexavalent chromium color of zinc alloy; Described spray ultraviolet light polymerization intermediate layer paint, the concrete grammar of levelling, UV solidification is: after spraying plating one deck UV paints, send into infrared baking section, after carrying out levelling, 3 ~ 10min is dried at 50 ~ 70 DEG C, send into ultraviolet photo-curing section again and carry out UV irradiation curing cross-linked 10 ~ 45s, the energy that UV irradiates solidification is 500 ~ 1000mJ/cm
2; UV paint for urethane acrylate class UV coating, and adds toning agent and mixes colours; Described spray UV finish paint, the concrete grammar of levelling, UV solidification is: after spraying plating one deck UV paints, send into infrared baking section, after carrying out levelling, 3 ~ 10min is dried at 50 ~ 70 DEG C, send into ultraviolet photo-curing section again and carry out UV irradiation curing cross-linked 10 ~ 45s, the energy that UV irradiates solidification is 500 ~ 1000mJ/cm
2, UV paint is urethane acrylate class UV coating.
2. the surface treatment method of the high anti-corrosion imitative hexavalent chromium color of a kind of zinc alloy as claimed in claim 1, is characterized in that in step 3) in, the condition of described washing is rinsing 1 ~ 2min in de-ionized water tank; The condition of described drying and processing is dry 40 ~ 60min at 150 ~ 170 DEG C of temperature.
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