CN101899660B - Processing technology of dark green passivating film of galvanized workpiece - Google Patents
Processing technology of dark green passivating film of galvanized workpiece Download PDFInfo
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- CN101899660B CN101899660B CN 200910015476 CN200910015476A CN101899660B CN 101899660 B CN101899660 B CN 101899660B CN 200910015476 CN200910015476 CN 200910015476 CN 200910015476 A CN200910015476 A CN 200910015476A CN 101899660 B CN101899660 B CN 101899660B
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- deionized water
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- 238000012545 processing Methods 0.000 title claims abstract description 14
- 238000005516 engineering process Methods 0.000 title abstract description 11
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 22
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 20
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 20
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 18
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229960000583 acetic acid Drugs 0.000 claims abstract description 10
- 239000012362 glacial acetic acid Substances 0.000 claims abstract description 10
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 10
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 239000008367 deionised water Substances 0.000 claims description 30
- 229910021641 deionized water Inorganic materials 0.000 claims description 30
- 238000002161 passivation Methods 0.000 claims description 28
- 239000011701 zinc Substances 0.000 claims description 27
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 19
- 229910052725 zinc Inorganic materials 0.000 claims description 19
- 230000009849 deactivation Effects 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 9
- 238000007598 dipping method Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000009713 electroplating Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 229910001868 water Inorganic materials 0.000 claims description 4
- 206010053615 Thermal burn Diseases 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000012467 final product Substances 0.000 claims description 2
- 238000000861 blow drying Methods 0.000 abstract 1
- 238000000643 oven drying Methods 0.000 abstract 1
- 239000003973 paint Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 39
- 239000011651 chromium Substances 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010349 cathodic reaction Methods 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 150000003016 phosphoric acids Chemical class 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- FFRBMBIXVSCUFS-UHFFFAOYSA-N 2,4-dinitro-1-naphthol Chemical compound C1=CC=C2C(O)=C([N+]([O-])=O)C=C([N+]([O-])=O)C2=C1 FFRBMBIXVSCUFS-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910017488 Cu K Inorganic materials 0.000 description 1
- 229910017541 Cu-K Inorganic materials 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-L Phosphate ion(2-) Chemical compound OP([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-L 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000011022 opal Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- MEYZYGMYMLNUHJ-UHFFFAOYSA-N tunicamycin Natural products CC(C)CCCCCCCCCC=CC(=O)NC1C(O)C(O)C(CC(O)C2OC(C(O)C2O)N3C=CC(=O)NC3=O)OC1OC4OC(CO)C(O)C(O)C4NC(=O)C MEYZYGMYMLNUHJ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a processing technology of dark green passivating film of galvanized workpiece, which comprises the steps of: passivating a polished workpiece in dark green passivating solution, then cleaning, scalding and blow-drying or oven-drying the workpiece. The dark green passivating solution contains the components of chromic anhydride, phosphoric acid, nitric acid, sulfuric acid, glacial acetic acid and silver nitrate. The passivating film of the galvanized workpiece according to the processing technology has elegant and shiny appearance, soft luminosity and the color of black in green, which is just like a coat of paint, and in addition, the passivating film, different significantly from army-green passivating film and black passivating film, has good adhesion force, quite strong hydrophobicity on the surface thereof and excellent corrosive resistance.
Description
Technical field
The invention belongs to the electroplating technology field, specifically, is a kind of complete processing of dark green passivating film of galvanized workpiece.
Background technology
Because steel substrate gets rusty easily, and protects through electro-galvanizing usually in the industry, just protects steel substrate with the sacrifice of zinc.But the zinc very active metal that is a kind of chemical property, the zinc-plated back of workpiece as do not carry out aftertreatment, coating will soon deepening, and occurs the white corrosion thing in succession.For avoiding the generation of this phenomenon, adopt passivating solution to come the zinc coating of workpiece is carried out Passivation Treatment often, make the zinc coating surface form one deck passive film, to improve its erosion resistance.After passive film forms, not only can improve the erosion resistance of zinc coating greatly, and the outward appearance of zinc coating also becomes rich and varied.According to the difference of passivating solution, the outward appearance of zinc coating can present iris, also can present white, pearl opal, green black colour, black, golden yellow etc.Still the relevant report that does not have at present the dark green passivating film of galvanized workpiece complete processing.
Summary of the invention
The complete processing that the purpose of this invention is to provide a kind of dark green passivating film of galvanized workpiece, the passive film glossiness that this technology forms is good, and sticking power is good, erosion resistance is strong.
For realizing above-mentioned purpose, the characteristic of technical scheme of the present invention is to take following steps:
A, galvanized workpiece is taken out from plating tank, water cleans, and removes electroplating solution residual on the workpiece;
B, the workpiece after will cleaning are put into certain density salpeter solution and are carried out bright dipping;
C, clean up, then workpiece is put into greenblack passivation solution and carry out passivation with residual light-emitting solution on the workpiece of deionized water after with bright dipping;
After d, passivation finish, workpiece is taken out from passivating solution, in air, leave standstill for some time, the sufficient reacting of passivating solution and zinc layer is carried out;
E, with workpiece with deionized water Rapid Cleaning one time, and then scald fast with the high temperature deionized water, dry up with cold wind at last or constant temperature drying gets final product.
Among the present invention, said salpeter solution is 1% salpeter solution in the b step, and the bright dipping time is 1s; Want the slight jitter workpiece in the c step passivating process, the time 30-50s that in greenblack passivation solution, stops; The time of in air, leaving standstill in the d step is 60-120s; Use the time of deionized water Rapid Cleaning to be 1s in the e step; Said high temperature deionized water is meant 60 ℃ deionized water, and the time of scalding is 1s; The temperature that constant temperature drying refers to is 60 ℃, and drying time is 15-20min.
By 1 liter of passivating solution, the component of said greenblack passivation solution is:
Chromic anhydride 20-25 (g/L);
The 10-11 (ml/L) of phosphoric acid/(d=1.7)
The 2-2.5 (ml/L) of nitric acid/(d=1.4)
The 2-2.5 (ml/L) of sulfuric acid/(d=1.84)
Glacial acetic acid min. 99.5 4-5 (ml/L)
Silver Nitrate 0.007-0.008 (g/L)
Surplus is a deionized water.
The preparation method of above-mentioned greenblack passivation solution is: in deactivation slot, inject appropriate amount of deionized water in advance, add chromic anhydride, phosphoric acid, nitric acid, sulfuric acid, Glacial acetic acid min. 99.5 and the Silver Nitrate of aequum then successively; In deactivation slot, add deionized water to predetermined level, stir.Should fully stir after adding chromic anhydride, add other components again after it is fully dissolved; The Silver Nitrate that is added joins in the deactivation slot after should making its dissolving with deionized water earlier again; Add all raw materials and add deionized water to the predetermined level back that stirs and measure the pH value of solution, and make the pH value of solution not be higher than 1.5 with Glacial acetic acid min. 99.5 adjustment with the pH test paper.
The galvanized greenblack passive film that the present invention forms is made up of two valency zinc, trivalent chromium, chromic alkali formula chromic salt hydrate colloid, in the skeleton structure of film, also is embedded with ferrous metal particle and phosphoric acid salt, to keep the blackish green outward appearance of film.Two valency zine ions in the formed passive film derive from the zinc layer.When the zinc layer gets into passivating solution, in the interfacial layer of metal and passivating solution, because the existence of acid and the oxygenizement of chromic anhydride make the metallic zinc dissolving.In this interface tunic, the pH value improves rapidly, and it is trivalent chromium that hexavalent chrome reduction takes place simultaneously; The film forming colloid skeleton of trivalent chromium shape in alkaline film, this moment, the acidity of solution can not be too high, otherwise this colloidal film will be dissolved by hydrogen ion; So must strictly control the pH value in 1～1.5 scope; In rete, form the pH gradient, make the dissolving of solution one side form and the formation of zinc surface one side form reach balance, this moment, the ferrous metal particle was diffused in the passive film simultaneously.This process is promptly accused in 30～50s and is accomplished, if continue time expand, will make the zinc layer continue to consume, and causes unnecessary loss.After workpiece leaves passivating solution; Passive film should suitably stop 60～120s in air; The passive film that helps the passive film surface like this continues film formation reaction, and rete is thickened, and removes unnecessary passivating solution simultaneously; And then embathe and soak boiling hot in the entering deionized water fast, dry up with cold wind more at last or 60 ℃ of constant temperature dryings.
Specifically, in acidic solution, the main Cr that generates in the water-soluble back of chromic anhydride
2O
7 2-, and have following ionic equilibrium:
2CrO
4 2-+ 2H
+→ Cr
2O
7 2-+ H
2O formula (1)
Cr
2O
7 2-Be a very strong oxygenant, when zinc-plated part immersed in the passivating solution, chemical reaction took place in its surface:
Anodic reaction: Zn → Zn
2++ 2e
Cathodic reaction: CrO
4 2-+ 14H
++ 6e → 2Cr
3++ 7H
2O
2H
++2e→H
2↑
Also exist phosphoric acid in the solution, and have following balance:
H
3PO
4→H
2PO
4 -+H
+
H
2PO
4 -→HPO
4 2-+H
+
HPO
4 2-→PO
4 3-+H
+
Meanwhile, the Zn of anodic reaction generation
2+, can react with phosphate radical and the hydrogen phosphate on the interface, generate some insoluble phosphoric acid salt.The Cr that cathodic reaction generated
3+, also can react with phosphate radical, generate insoluble phosphoric acid chromic salts.
On the other hand, because the electrochemical reaction of zinc laminar surface, the pH value of reaction interface raises, and impels the balance of reaction formula (1) to be moved to the left, i.e. the portion C r of reaction interface
2O
7 2-Ion has generated CrO
4 2-Ion, Cr
3+And Zn
2+Deng positively charged ion and PO
4 3-, CrO
4 2-, HPO
4 2-, SO
4 2-, and H
2O etc. react, and form the gelatinous cpd of large-scale network molecule.This moment, the acidity of solution can not be too high, otherwise this colloidal film will be by H
+Therefore dissolving wants strict control pH value between 1～1.5, in film, to form the pH gradient, makes the forming process of film of dissolution process and the generation of zinc surface one side of the film that solution one side takes place reach balance.This moment, colouring particles Ag diffused in the passive film simultaneously, to guarantee the blackish green outward appearance of rete.
The present invention has following beneficial effect:
1, use the inventive method that galvanized workpiece is carried out passivation, formed passive film effective.After the galvanized workpiece passivation, the passive film outward appearance of formation is elegant, glossy, and luminosity is soft; Have black in the green hue, just as doped envelope, completely different with green black colour passive film and black passivation film; And the sticking power of passive film is good, and there are very strong hydrophobic nature, good corrosion resistance in the surface.Experimental technique according to GB9791-2003 regulation carries out adhesion test, uses the formed passive film of the present invention, can not have the grain soft rubber to wipe manual back and forth wiping 90 times not show-through through benefiting from.TP by GB/T6458-86 regulation is carried out corrosion resistance test, uses the formed passive film of the present invention, through neutral salt spray test, does not occur the white corrosion thing in 400 hours.
2, the present invention has the good social benefit.In the present electroplating technology, acid chlorization potassium zincincation is one of environmental protection technology few in number, and technology of the present invention is particularly suitable for using with this zincincation compatibility.Test shows, when the present invention carries out passivation to the workpiece that adopts acid chlorization potassium zincincation, can demonstrate its special advantages, and the passive film of its formation not only erosion resistance is strong, and bright in luster, and glossiness is good.
3, technology of the present invention is simple, and raw material is easy to get, and is reasonable in design, is convenient to implement.
Description of drawings
Fig. 1 is the XRD spectra of blackish green passivation sample.
Embodiment
The complete processing of embodiment 1, present embodiment dark green passivating film of galvanized workpiece is as follows:
1. prepare greenblack passivation solution
By the amount of 1 liter of solution, the component of greenblack passivation solution is:
Chromic anhydride 20 (g/L);
11 (ml/L) of phosphoric acid/(d=1.7);
2.5 (ml/L) of nitric acid/(d=1.4);
2.5 (ml/L) of sulfuric acid/(d=1.84);
Glacial acetic acid min. 99.5 5 (ml/L);
Silver Nitrate 0.008 (g/L);
Surplus is a deionized water.Its preparation method is: in deactivation slot, inject appropriate amount of deionized water in advance; Fully stir add the chromic anhydride of aequum in the ratio of said components after; It is fully dissolved; The phosphoric acid, nitric acid, sulfuric acid, Glacial acetic acid min. 99.5 and the Silver Nitrate that add aequum then successively, the Silver Nitrate that is wherein added joins in the deactivation slot after should making its dissolving with deionized water earlier again; In deactivation slot, add deionized water to predetermined level, stir; Measure the pH value of solution with the pH test paper, and make the pH value of solution not be higher than 1.5 with Glacial acetic acid min. 99.5 adjustment.
2. galvanized workpiece is carried out passivation
A, galvanized workpiece is taken out from plating tank, water cleans, and removes electroplating solution residual on the workpiece;
B, the workpiece after will cleaning are put into 1% salpeter solution bright dipping, and the time is 1s;
C, clean up with residual light-emitting solution on the workpiece of deionized water after with bright dipping, put into the above-mentioned greenblack passivation solution for preparing then and carry out passivation, note answering the slight jitter workpiece in the passivating process, the time that workpiece stops in passivating solution is 30-50s;
After d, passivation finish, workpiece is taken out from passivating solution, in air, leave standstill 60-120s, the sufficient reacting of passivating solution and zinc layer is carried out;
E, with workpiece with deionized water Rapid Cleaning one time, the time is 1s, scalds fast with 60 ℃ high temperature deionized water then, the time of scalding is 1s, dry up with cold wind at last, or under 60 ℃ temperature constant temperature drying 15-20min.
The dark green passivating film that present embodiment forms galvanized workpiece learns that through test its sticking power and corrosion resistance nature all are much higher than the GB requirement.Adopt the INCAx-sight energy spectrometer (EDS) of England Oxford company that the surface of dark green passivating film is analyzed, record dark green passivating film surface-element distribution situation and see the following form:
| Element | O | P | S | Cr | Zn | Fe |
| wt％ | 35.73 | 4.42 | 2.24. | 8.35 | 48.06 | 1.21 |
| at％ | 66.41 | 4025 | 2.07 | 4.78 | 21.86 | 0.64 |
[0056]The model that adopts Japanese Rigaku Denki Co., Ltd to produce is the X-ray diffractometer of D/max-rB; Be in test condition that copper target (Cu-K α), pipe are pressed 40kV, pipe stream 100mA, strafed 6 °/min of speed, under the condition of 30 °～90 ° of sweep limits; Analyze the phase composite of passivation layer, the XRD spectra that obtains blackish green passivation sample is as shown in Figure 1.Mark out contained material with distinct symbols among the figure, XRD analysis is the result show, except Zn crystal (zinc coating), other material also occurred, and they are respectively CrPO
4, Cr (OH)
3, CrOOH, Cr
2O
3, Zn (OH)
2, 2ZnOCrO
3H2O and Zn
3(PO
4)
24H
2O.
The component of embodiment 2, every liter of greenblack passivation solution of present embodiment is:
Chromic anhydride 25 (g/L);
10 (ml/L) of phosphoric acid/(d=1.7);
2 (ml/L) of nitric acid/(d=1.4);
2 (ml/L) of sulfuric acid/(d=1.84);
Glacial acetic acid min. 99.5 4 (ml/L);
Silver Nitrate 0.007 (g/L);
Surplus is a deionized water.The other technologies characteristic is with embodiment 1.
Claims (6)
1. the complete processing of a dark green passivating film of galvanized workpiece is characterized in that taking following steps:
A, galvanized workpiece is taken out from plating tank, water cleans, and removes electroplating solution residual on the workpiece;
B, the workpiece after will cleaning are put into certain density salpeter solution and are carried out bright dipping;
C, clean up, then workpiece is put into greenblack passivation solution and carry out passivation with residual light-emitting solution on the workpiece of deionized water after with bright dipping; The preparation method of this greenblack passivation solution is: in deactivation slot, inject appropriate amount of deionized water in advance, add chromic anhydride, phosphoric acid, nitric acid, sulfuric acid, Glacial acetic acid min. 99.5 and the Silver Nitrate of aequum then successively; In deactivation slot, add deionized water to predetermined level, stir; By the amount of 1 liter of passivating solution, the amount of each component that this greenblack passivation solution contained is:
After d, passivation finish, workpiece is taken out from passivating solution, in air, leave standstill for some time, the sufficient reacting of passivating solution and zinc layer is carried out;
E, with workpiece with deionized water Rapid Cleaning one time, and then scald fast with the high temperature deionized water, dry up with cold wind at last or constant temperature drying gets final product.
2. the complete processing of dark green passivating film of galvanized workpiece as claimed in claim 1 is characterized in that said salpeter solution in the b step is 1% salpeter solution, and the bright dipping time is 1s.
3. the complete processing of dark green passivating film of galvanized workpiece as claimed in claim 1 is characterized in that wanting the slight jitter workpiece in the c step passivating process time 30-50s that in greenblack passivation solution, stops.
4. the complete processing of dark green passivating film of galvanized workpiece as claimed in claim 1 is characterized in that in the preparation process of greenblack passivation solution, fully stirs after adding earlier chromic anhydride, adds other components again after it is fully dissolved; The Silver Nitrate that is added joins in the deactivation slot after should making its dissolving with deionized water earlier again; Add all raw materials and add deionized water to the predetermined level back that stirs and measure the pH value of solution, and make the pH value of solution not be higher than 1.5 with Glacial acetic acid min. 99.5 adjustment with the pH test paper.
5. the complete processing of dark green passivating film of galvanized workpiece as claimed in claim 1 is characterized in that the time of in air, leaving standstill in the d step is 60-120s.
6. the complete processing of dark green passivating film of galvanized workpiece as claimed in claim 1 is characterized in that using in the e step time of deionized water Rapid Cleaning to be 1s; Said high temperature deionized water is meant 60 ℃ deionized water, and the time of scalding is 1s; Constant temperature drying is meant that temperature is 60 ℃, and drying time is 15-20min.
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|---|---|---|---|
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|---|---|---|---|
| CN 200910015476 CN101899660B (en) | 2009-05-27 | 2009-05-27 | Processing technology of dark green passivating film of galvanized workpiece |
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| CN103789758B (en) * | 2014-02-17 | 2016-09-07 | 默克新科技发展（天津）有限公司 | Golden yellow passivator of a kind of zinc coat and preparation method thereof and deactivating process for the treatment of |
| CN107299365A (en) * | 2017-06-29 | 2017-10-27 | 十堰市协兴工贸有限公司 | A kind of weldment plates post-passivation process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055775A (en) * | 1991-04-11 | 1991-10-30 | 上海市长城电镀厂 | Chromate composite used for passivation of zine plated layer on metal body and application thereof |
-
2009
- 2009-05-27 CN CN 200910015476 patent/CN101899660B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055775A (en) * | 1991-04-11 | 1991-10-30 | 上海市长城电镀厂 | Chromate composite used for passivation of zine plated layer on metal body and application thereof |
Non-Patent Citations (2)
| Title |
|---|
| 沈品华等.电镀锌及锌合金.《电镀锌及锌合金》.机械工业出版社,2002,第122、149-156页. * |
| 王宏.镀锌墨绿色钝化工艺的研究.《山东机械》.2002,(第5期),第13-14页. * |
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| CN101899660A (en) | 2010-12-01 |
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