CN109097766A - A kind of alkalinity molybdate chromium-free passivation liquid and its passivating method - Google Patents
A kind of alkalinity molybdate chromium-free passivation liquid and its passivating method Download PDFInfo
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- CN109097766A CN109097766A CN201811008778.1A CN201811008778A CN109097766A CN 109097766 A CN109097766 A CN 109097766A CN 201811008778 A CN201811008778 A CN 201811008778A CN 109097766 A CN109097766 A CN 109097766A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
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Abstract
The present invention relates to a kind of chromium-free deactivation methods for zine plate surface treatment, the processing step of this method is as follows: (1) preparing chromium-free passivation liquid, sodium hydroxide 1-8 g/L, sodium metasilicate sodium 2-10 g/L molybdate 5-25 g/L, complexing agent 2-15 g/L, oxidant 3-12 g/L are sequentially added in distilled water and adjust pH value as 9-11；(2) processing before being passivated to zine plate；(3) processing is passivated to zine plate immediately after pre-treatment, 50-70 DEG C for the treatment of temperature, processing time 1-3min are washed after processing and dry or dry.After Passivation Treatment, the passivating film of one layer of grey uniform compact can be obtained on zine plate surface, passivating film corrosion resistance is good.Technological operation of the present invention is easy, low in cost, and chromium-free environment-friendly, is easily achieved industrialization at without phosphorus free-floride.
Description
Technical field
The invention belongs to the technical fields of metal material surface processing, and in particular to a kind of alkalinity molybdate chromium-free passivation liquid
And its application.
Background technique
The standard electrode EMF of zinc is -0.76 V, more negative than the potential of iron (- 0.44 V), therefore the zinc-plated category of surface of steel plate
In anodic coating.In addition, zinc is more stable in air, cost is relatively low, rich reserves, it is nontoxic, recyclable the features such as, make to plate
Zine plate all has extensive use in fields such as machinery, aviation, automobile and buildings.Wherein, demand of the construction(al)steel to zinc-plated is just high
Up to 90% or more, and this demand is still growing day by day.Counted according to International Zinc Association, the whole world be used for every year steel corrosion with
The metallic zinc of protection is more than 5,000,000 tons, is retrieved beautiful up to 2.2 trillion for economic loss needed for repairing and replacing steel part
Member.
Zinc coating mainly realizes the protection to steel substrate as steel protectiveness coating by sacrificial anode protection, so
Coating must have enough thickness that can just play a good protective effect.But the blocked up waste that will lead to zinc of coating, coating
Welding performance reduces, and is extremely difficult to bright in mirror surface after spray coating.Therefore, Several Thiourea Derivatives on Zinc Plate Surface usually requires Passivation Treatment,
Zinc Deposit forms one layer of inert barrier to resist ambient enviroment corrosion, and then extends the coating service life.In addition to this, it takes
Different Passivation Treatments can also assign zinc coating different colours, also have decoration function while protective coating.
Traditional passivation generallys use sexavalence chromium process, the passivating film of acquisition, and corrosion resistance is good, at low cost, easy to operate and dimension
Shield, application are extremely wide.But its toxicity is very big, and has very strong carcinogenesis to human body, is instructed according to RoHS, and European Union will be in
The use of total ban Cr VI in 2017, WEEE also forbid or strictly limit the use of Cr VI, and being badly in need of exploitation can be environmentally friendly real
Non-chromium inactivating technique.
It is more to the research of chromium-free deactivation both at home and abroad, main organic/inorganic substance passivating technique, organic matter passivating technique and organic
The composite passivated technology of object/inorganic matter, wherein inorganic passivating technique has passivation (passivation of molybdenum salt, tungstates of the 6th subgroup element
Passivation etc.), the passivation of modified Portland, the passivation of rare earth metal salt, the passivation of rare earth metal salt；Organic matter passivating technique has
The passivation of tannic acid, the passivation of phytic acid, the passivation of organosilan.But almost all of Trend of Chrome-free research all concentrates on acidity at present
Under the conditions of carry out, it is rare have alkaline process research report.CN201180008693.3 is claimed a kind of " for alkaline passivation zinc
The composition on surface ", according to the disclosure of which, technique main component are as follows: iron (III) ion (0.05-2g/kg), phosphate radical
Ion (0.1-4g/kg), at least complexing agent of 0.1g/kg, and the nonionic surface active agent of 0.01-10g/kg in total.
It follows that effective film forming matter is iron ion in the process recipe, further according to the statement of its claim 16, " gold
The surface of the zinc or kirsite that belong to component shows equal at least about 20mg/m2 but is no more than the surface of iron of 150mg/m2 and covers
Cover degree ", it is seen that zinc or zinc alloy surface covered after processing is iron, rather than compound.Its essence is in zinc or zinc surface
One layer of metallic iron is displaced, this is really the scope replaced and plated, and non-passivation.One kind is claimed in CN201180058158.9
" with the method for alkaline compositions passivating metallic surfaces ", but its technique really coats a kind of alkaline compositions in metal surface,
And directly the applicator is dried to obtain protective film.A kind of " alkaline passivation is claimed in CN201610148615.8
Liquid ", formulation parameter are as follows: pH=10-12 of passivating solution, component and content are alkaline matter 25- 65g/L, fluoride 5-
10g/L, sulfate 10-15g/L, hydrogen peroxide 15-25mL/L ", formula composition is as it can be seen that the technique is to plate under alkaline condition
Zinc layers surface forms fluoride films.In addition, hydrogen peroxide is extremely easy in decomposition under alkaline condition, cause system that can not stablize.
CN201611179923.3 is disclosed " a kind of alkaline passivation liquid ", which is a kind of alkaline phosphating technology.
From the foregoing, it will be observed that traditional galvanized sheet passivation is Cr VI technology, but toxicity is big, will be prohibited from using.Recent decades
Come, the environmentally friendly Trend of Chrome-free technical research overwhelming majority concentrates on acid range progress, and these Chrome-free technologies are also in experiment
The room stage, it is rare can the technology of industrialization emerge.Based on the status of galvanized sheet chromium-free deactivation, inventor opens by studying for a long period of time
Alkaline molybdate chromium-free passivation liquid of the present invention is sent out.
Summary of the invention
It is an object of the invention to passivating film be prepared in zinc-plated plate surface, so that it is resistance to improve galvanized sheet by Passivation Treatment
Corrosion.And the passivating technique used can solve murder by poisoning of traditional sexavalence chromium process to human body and environment for alkaline Chromeless process
Problem.The present invention considers the problems of the productions ends such as formulation cost, raw material storage and transportation, finished product storage and transportation；Combine products application
And the operability of each link of discharge, make every effort to simple process and low cost, is easy to industrialization, it can be in industrial circle
It is widely applied.
It is an object of the present invention to provide a kind of alkaline molybdate chromium-free passivation liquids, including following ingredient:
Sodium hydroxide 1-8 g/L；Preferably 3-6 g/L；
Sodium metasilicate 2-10 g/L；Preferably 4-7 g/L；
Molybdate 5-25 g/L；
Complexing agent 2-15 g/L；
Oxidant 3-12 g/L；
Water；
Preferably, the molybdate is selected from one of sodium molybdate or potassium molybdate, and concentration is preferably 10-18g/L；
Preferably, the complexing agent is selected from one or both of sodium citrate, sodium tetraborate, and concentration is preferably citric acid
Sodium 8-12g/L and/or sodium tetraborate 2-4g/L；
Preferably, the oxidant is selected from one or both of sodium peroxydisulfate or sodium perborate, and concentration is preferably over cure
Sour sodium 5-8g/L and/or sodium perborate 3-5g/L；
Preferably, the water is distilled water；
Preferably, the pH of the passivating solution is adjusted to 9-11, and the citric acid that the reagent for adjusting pH value is selected from 12g/L is molten
The NaOH solution of liquid and/or 10g/L；
Further, another object of the present invention is to provide a kind of alkaline molybdate chromium-free deactivation method for galvanized sheet,
Include the following steps:
(1) passivating solution is prepared, the passivating solution includes following ingredient:
Sodium hydroxide 1-8 g/L；Preferably 3-6 g/L；
Sodium metasilicate 2-10 g/L；Preferably 4-7 g/L；
Molybdate 5-25 g/L；
Complexing agent 2-15 g/L；
Oxidant 3-12 g/L；
Water；
(2) processing before zine plate is passivated: zine plate surface is polished flat with 1000# sand paper, is degreased through alkali cleaning, then pickling
Activation, to Passivation Treatment after cleaning；
(3) it will be directly immersed in 50-70 DEG C of passivating solution after the cleaning of the galvanized sheet of pre-treatment and be passivated processing, when processing
Between 1-3 min, passivation complete after through washing and naturally dry or drying.
Sodium hydroxide in step (1) described passivating solution is passivating solution pH adjusting agent；
Sodium metasilicate in step (1) described passivating solution participates in passivation film forming, while having pH adjustment effect, so that passivating solution is in
Alkaline condition；
Preferably, step (1) molybdate is selected from one of sodium molybdate or potassium molybdate, and concentration is preferably 10-18g/
L, for passivating film film forming main salt；
Preferably, step (1) complexing agent is selected from the one or two of sodium citrate, sodium tetraborate, and concentration is preferably
Sodium citrate 8-12g/L and/or sodium tetraborate 2-4g/L.Complexing agent has stabilization to the pH value of passivating solution, can make to be passivated
Liquid is stablized within the longer working time in required pH value section, to reduce pH adjustment process；
Preferably, step (1) oxidant is selected from sodium peroxydisulfate or sodium perborate, and concentration is preferably sodium peroxydisulfate 5-
8g/L and/or sodium perborate 3-5g/L；
Preferably, step (1) water is distilled water；
Preferably, the pH of step (1) described passivating solution is adjusted to 9-11, and the reagent for adjusting pH value is selected from 12g/L's
The NaOH solution of citric acid solution and/or 10g/L；
Preferably, include for the solution of step (2) alkali cleaning: NaOH 3g/l, 5 g/l of alkyl glycosides (APG), poly- second two
Alcohol (PEG-400) 10g/l, ethyl alcohol 20g/l.Wherein, NaOH is common alkali compound, is conducive to lipid solubilization；Alkyl sugar
Glycosides is environmentally friendly surface-active, keeps grease soluble in water；Polyethylene glycol is solvent, increases the cleaning ability of alkali wash water；Ethyl alcohol is
Dissolution increases cleaning effect, while having preferable defoaming effect, avoids cleaning process foam too big；
Preferably, include for the solution of step (2) pickling: 3% hydrochloric acid solution.It can be such that zine plate surface metal-layer dissolves,
Fresh surface is exposed, the bigger matrix of reactivity is obtained, goes on smoothly passivation reaction；
Preferably, when carrying out step (3) described Passivation Treatment, passivating solution is heated to 50-70 DEG C, the zine plate after pre-treatment
It should immerse immediately in passivating solution and be passivated processing, fresh surface is avoided to be oxidized again；
Preferably, washing described in step (3) includes that twice are originally washed, and distillation washing, the drying temperature are together
120 DEG C, drying time 20min.
The present invention has the advantage that
(1) its treatment temperature of technique of the present invention is 50-70 DEG C, handles time 1-3min, temperature is not high, is conducive to save
The energy；
It (2) is grey film by the passivating film of the method for the invention preparation, and color is uniform, film layer is fine and close, is firmly combined, practical
Convenient for observation film-formation result in production；
(3) passivating solution composition of the present invention is simple, each stable components, the passivating solution excellent in stability being formulated, and grasps
Make simplicity, it is low in cost, it is easy to accomplish industrialization；
(4) passivating solution of the present invention is free of the huge sexavalence of toxicity or trivalent Cr element, blunt without harmful elements such as P, F
It is simple to change liquid emission treatment, is a kind for the treatment of process of safety and environmental protection；
(5) the good coloured passivating film of corrosion resistance can get by the zine plate that present invention processing obtains, can be detected in passivating film
The elements such as Mo, Si, O, Zn.This index of compactness is good, first is that sample passes through naked-eye observation after making, without obvious dust, hence it is evident that
Crackle and hole；Second is that putting several thousand times larger observation microscopic appearance by scanning electron microscope, film layer does not occur a large amount of holes, is not to present
Soft fluffy state, it is fine and close that this passivating film, which can be said,.
Detailed description of the invention
Fig. 1 is zine plate passivation technology flow chart of steps of the present invention；
Fig. 2 is the Tafel polarization curve of blank test piece and passivation test piece in 3.5wt%NaCl solution；
Fig. 3 is that alkaline molybdate technique is passivated photo zincography surface SEM spectrum.
Specific embodiment
Below in conjunction with Figure of description, technical scheme in the embodiment of the invention is clearly and completely described, shows
So, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the reality in the present invention
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the scope of protection of the invention.
The present invention provides a kind of alkaline molybdate chromium-free passivation liquid, including following ingredient:
Sodium hydroxide 1-8 g/L；Preferably 3-6 g/L；
Sodium metasilicate 2-10 g/L；Preferably 4-7 g/L；
Molybdate 5-25 g/L；
Complexing agent 2-15 g/L；
Oxidant 3-12 g/L；
Water；
Preferably, the molybdate is selected from one of sodium molybdate or potassium molybdate, and concentration is preferably 10-18g/L；
Preferably, the complexing agent is selected from one or both of sodium citrate, sodium tetraborate, and concentration is preferably citric acid
Sodium 8-12g/L and/or sodium tetraborate 2-4g/L；
Preferably, the oxidant is selected from one or both of sodium peroxydisulfate or sodium perborate, and concentration is preferably over cure
Sour sodium 5-8g/L and/or sodium perborate 3-5g/L.
Embodiment 1
A kind of alkalinity molybdate chromium-free passivation liquid, composition and preparation method are as follows:
700mL distilled water is added in clean beaker, sequentially adds:
NaOH 2.0g Na2SiO3×2H2O 4.0 g
Na2MoO4×2H2O 10.0g Na2B4O7×10H2O 2.0g
Na2S2O85.0 g；
It in adding procedure, need to be added after former reagent is completely dissolved, after the completion of addition, add distilled water to 900 ml,
Solution ph is tested, and adjusting passivating solution pH value with NaOH solution and citric acid solution is 9.5, adds distilled water to 1000 ml,
Obtain required passivating solution.
Embodiment 2
A kind of alkalinity molybdate chromium-free passivation liquid, composition and preparation method are as follows:
700mL distilled water is added in clean beaker, sequentially adds:
NaOH 3.0g Na2SiO3×2H2O 2.0 g
K2MoO4×2H2O 25.0g C6H5O7Na3×2H2O 8.0g
NaBO3×4H2O 3.0g；
It in adding procedure, need to be added after former reagent is completely dissolved, after the completion of addition, add distilled water to 900 ml,
Solution ph is tested, and adjusting passivating solution pH value with NaOH solution and citric acid solution is 11, adds distilled water to 1000 ml,
Obtain required passivating solution.
Embodiment 3
A kind of alkalinity molybdate chromium-free passivation liquid, composition and preparation method are as follows:
700mL distilled water is added in clean beaker, sequentially adds:
NaOH 1.0g Na2SiO3×2H2O 6.0 g
K2MoO4×2H2O 22.0g C6H5O7Na3×2H2O 10.0g
Na2S2O89.0 g；
It in adding procedure, need to be added after former reagent is completely dissolved, after the completion of addition, add distilled water to 900 ml,
Solution ph is tested, and adjusting passivating solution pH value with NaOH solution and citric acid solution is 9, adds distilled water to 1000 ml, i.e.,
Passivating solution needed for being made.
Embodiment 4
A kind of alkalinity molybdate chromium-free passivation liquid, composition and preparation method are as follows:
700mL distilled water is added in clean beaker, sequentially adds:
NaOH 7.0g Na2SiO3×2H2O 3.0 g
Na2MoO4×2H2O 18.0g C6H5O7Na3×2H2O 5.0g
Na2B4O7×10H2O 2.0g NaBO3×4H2O 5.0g；
It in adding procedure, need to be added after former reagent is completely dissolved, after the completion of addition, add distilled water to 900 ml,
Solution ph is tested, and adjusting passivating solution pH value with NaOH solution and citric acid solution is 10, adds distilled water to 1000 ml,
Obtain required passivating solution.
With reference to Fig. 1, the present invention also provides a kind of alkaline molybdate chromium-free deactivation methods for galvanized sheet, including walk as follows
It is rapid:
(1) passivating solution is prepared, the passivating solution includes following ingredient:
Sodium hydroxide 1-8 g/L；Preferably 3-6 g/L；
Sodium metasilicate 2-10 g/L；Preferably 4-7 g/L；
Molybdate 5-25 g/L；
Complexing agent 2-15 g/L；
Oxidant 3-12 g/L；
Water；
(2) processing before zine plate is passivated: zine plate surface is polished flat with 1000# sand paper, is degreased through alkali cleaning, then pickling
Activation, to Passivation Treatment after cleaning；
(3) it will be directly immersed in 50-70 DEG C of passivating solution after the cleaning of the galvanized sheet of pre-treatment and be passivated processing, when processing
Between 1-3 min, passivation complete after through washing and naturally dry or drying.
Embodiment 5
A kind of alkaline molybdate chromium-free deactivation method for galvanized sheet, includes the following steps:
(1) sample prepares: zine plate being cut into the sample of 30 × 50 × 3mm, and is punched in sample one end in order to hang；
(2) pre-treatment: the test piece cut is handled by following process, and acid-wash activation is washed in polishing alkali cleaning oil removing
Washing.Wherein polishing directlys adopt 1000# sand paper and polishes；Oil removing is room temperature alkaline degreasing 10 minutes；Activation uses
3.0% HCl solution, room temperature activate 10-20 s, are passivated processing after distilled water cleaning；
(3) Passivation Treatment after the completion of test piece pre-treatment, cleans through distilled water and immediately enters the prepared passivating solution of embodiment 1
In be passivated processing.Passivating solution temperature 70 C, 3.0 min of passivation time, after Passivation Treatment, test piece is rinsed well simultaneously immediately
120 DEG C of drying, i.e. completion Passivation Treatment.
Embodiment 6
A kind of alkaline molybdate chromium-free deactivation method for galvanized sheet, includes the following steps:
(1) sample prepares: zine plate being cut into the sample of 30 × 50 × 3mm, and is punched in sample one end in order to hang；
(2) pre-treatment: the test piece cut is handled by following process, and acid-wash activation is washed in polishing alkali cleaning oil removing
Washing.Wherein polishing directlys adopt 1000# sand paper and polishes；Oil removing is room temperature alkaline degreasing 10 minutes；Activation uses
3.0% HCl solution, room temperature activate 10-20 s, are passivated processing after distilled water cleaning；
(3) Passivation Treatment after the completion of test piece pre-treatment, cleans through distilled water and immediately enters the prepared passivating solution of embodiment 2
In be passivated processing.55 DEG C of passivating solution temperature, 2.0 min of passivation time, after Passivation Treatment, test piece rinse well immediately and from
It so dries, i.e. completion Passivation Treatment.
Embodiment 7
A kind of alkaline molybdate chromium-free deactivation method for galvanized sheet, includes the following steps:
(1) sample prepares: zine plate being cut into the sample of 30 × 50 × 3mm, and is punched in sample one end in order to hang；
(2) pre-treatment: the test piece cut is handled by following process, and acid-wash activation is washed in polishing alkali cleaning oil removing
Washing.Wherein polishing directlys adopt 1000# sand paper and polishes；Oil removing is room temperature alkaline degreasing 10 minutes；Activation uses
3.0% HCl solution, room temperature activate 10-20 s, are passivated processing after distilled water cleaning；
(3) Passivation Treatment after the completion of test piece pre-treatment, cleans through distilled water and immediately enters the prepared passivating solution of embodiment 3
In be passivated processing.65 DEG C of passivating solution temperature, 2.0 min of passivation time, after Passivation Treatment, test piece is rinsed well simultaneously immediately
120 DEG C of drying and processing 20min, i.e. completion Passivation Treatment.
Embodiment 8
A kind of alkaline molybdate chromium-free deactivation method for galvanized sheet, includes the following steps:
(1) sample prepares: zine plate being cut into the sample of 30 × 50 × 3mm, and is punched in sample one end in order to hang；
(2) pre-treatment: the test piece cut is handled by following process, and acid-wash activation is washed in polishing alkali cleaning oil removing
Washing.Wherein polishing directlys adopt 1000# sand paper and polishes；Oil removing is room temperature alkaline degreasing 10 minutes；Activation uses
3.0% HCl solution, room temperature activate 10-20 s, are passivated processing after distilled water cleaning；
(3) Passivation Treatment after the completion of test piece pre-treatment, cleans through distilled water and immediately enters the prepared passivating solution of embodiment 4
In be passivated processing.Passivating solution temperature 60 C, 2.5 min of passivation time, after Passivation Treatment, test piece rinse well immediately and from
It so dries, i.e. completion Passivation Treatment.
The entire passivation technology process of zine plate is as shown in Figure 1.
The corrosion-resistant experiment of test piece after Passivation Treatment, tests test piece using CHI-660D electrochemical workstation.It adopts
With three-electrode system, Electrode is trivalent chromium passivation test piece, and auxiliary electrode is the platinized platinum of 1cm × 1cm, and reference electrode is saturation
Calomel electrode, electrolyte solution 3.5wt%(pH6.8) NaCl solution.Main test dynamic potential polarization curve, the electricity of test
Pressing range is ± 250mV(relative to open-circuit voltage), scanning speed 2mV/s.It detects while comparing blank test piece and pass through
It is passivated the corrosion resistance of test piece (embodiment 8), test results are shown in figure 2.By testing result as it can be seen that after Passivation Treatment test piece exist
3.5 in the NaCl solution of wt% corrosion current by blank test piece 254.6 μ A/cm2Fall to 27.6 μ A/cm2, corrosion current
Have dropped about an order of magnitude.And with the pattern of surrounding and watching of scanning electron microscope observation passivated surface, passivating film surrounds and watches pattern and tradition
Passivating film is close, whole more uniform, has crackle (as shown in Figure 3), these crackles are conducive to improve the binding force of subsequent spray coating.
Claims (9)
1. a kind of alkalinity molybdate chromium-free passivation liquid, which is characterized in that including following ingredient:
Sodium hydroxide 1-8 g/L；
Sodium metasilicate 2-10 g/L；
Molybdate 5-25 g/L；
Complexing agent 2-15 g/L；
Oxidant 3-12 g/L；
Water.
2. alkalinity molybdate chromium-free passivation liquid according to claim 1, which is characterized in that the molybdate is selected from sodium molybdate
Or one of potassium molybdate；The complexing agent is selected from one or both of sodium citrate, sodium tetraborate；The oxidant is selected from
One or both of sodium peroxydisulfate or sodium perborate；The water is distilled water.
3. alkalinity molybdate chromium-free passivation liquid according to claim 1, which is characterized in that the pH of the passivating solution is adjusted to
9-11, the reagent for adjusting pH value are selected from the citric acid solution of 12g/L and/or the NaOH solution of 10g/L.
4. a kind of alkaline molybdate chromium-free deactivation method for galvanized sheet, which comprises the steps of:
(1) passivating solution is prepared, the passivating solution includes following ingredient:
Sodium hydroxide 1-8 g/L；
Sodium metasilicate 2-10 g/L；
Molybdate 5-25 g/L；
Complexing agent 2-15 g/L；
Oxidant 3-12 g/L；
Water；
(2) processing before zine plate is passivated: zine plate surface is polished flat with 1000# sand paper, is degreased through alkali cleaning, then pickling
Activation, to Passivation Treatment after cleaning；
(3) it will be directly immersed in 50-70 DEG C of passivating solution after the cleaning of the galvanized sheet of pre-treatment and be passivated processing, when processing
Between 1-3 min, passivation complete after through washing and naturally dry or drying.
5. the alkaline molybdate chromium-free deactivation method according to claim 4 for galvanized sheet, which is characterized in that step
(1) in, the molybdate is selected from one of sodium molybdate or potassium molybdate；The complexing agent is selected from sodium citrate, sodium tetraborate
It is one or two kinds of；The oxidant is selected from sodium peroxydisulfate or sodium perborate；The water is distilled water.
6. the alkaline molybdate chromium-free deactivation method according to claim 4 for galvanized sheet, which is characterized in that step
(1) pH of the passivating solution is adjusted to 9-11, and the reagent for adjusting pH value is selected from the citric acid solution and/or 10g/L of 12g/L
NaOH solution.
7. the alkaline molybdate chromium-free deactivation method according to claim 4 for galvanized sheet, which is characterized in that for walking
Suddenly the solution of (2) alkali cleaning includes: NaOH 3g/L, alkyl glycosides (APG) 5 g/L, polyethylene glycol (PEG-400) 10g/L, second
Alcohol 20g/L；Solution for step (2) pickling includes: 3% hydrochloric acid solution.
8. the alkaline molybdate chromium-free deactivation method according to claim 4 for galvanized sheet, which is characterized in that carrying out
When step (3) described Passivation Treatment, passivating solution be heated to 50-70 DEG C, the zine plate after pre-treatment should immerse immediately in passivating solution into
Row Passivation Treatment.
9. the alkaline molybdate chromium-free deactivation method according to claim 4 for galvanized sheet, which is characterized in that step
(3) washing described in includes that twice are originally washed, and distillation washing together, the drying temperature is 120 DEG C, and drying time is
20min。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811008778.1A CN109097766A (en) | 2018-08-31 | 2018-08-31 | A kind of alkalinity molybdate chromium-free passivation liquid and its passivating method |
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| CN201811008778.1A CN109097766A (en) | 2018-08-31 | 2018-08-31 | A kind of alkalinity molybdate chromium-free passivation liquid and its passivating method |
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| CN110952082A (en) * | 2019-12-25 | 2020-04-03 | 廊坊师范学院 | Preparation method of hot-dip galvanized chromium-free passivation film |
| CN110983317A (en) * | 2019-12-17 | 2020-04-10 | 昆明理工大学 | Electrogalvanizing silicate molybdate composite type colorful passivation solution and preparation method thereof |
| CN110983318A (en) * | 2019-12-17 | 2020-04-10 | 昆明理工大学 | Organic-inorganic environment-friendly composite color passivation solution and preparation method thereof |
| CN113667970A (en) * | 2020-05-03 | 2021-11-19 | 江西金力永磁科技股份有限公司 | Surface passivation treatment method for neodymium iron boron magnetic steel |
| CN114951934A (en) * | 2022-04-06 | 2022-08-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Spot welding method for passivated galvanized sheet |
| CN117867484A (en) * | 2024-03-11 | 2024-04-12 | 武汉迪赛环保新材料股份有限公司 | Composite alkaline chromium-free passivating agent and preparation method and application thereof |
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| CN110983317A (en) * | 2019-12-17 | 2020-04-10 | 昆明理工大学 | Electrogalvanizing silicate molybdate composite type colorful passivation solution and preparation method thereof |
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| CN114951934A (en) * | 2022-04-06 | 2022-08-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Spot welding method for passivated galvanized sheet |
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| CN117867484A (en) * | 2024-03-11 | 2024-04-12 | 武汉迪赛环保新材料股份有限公司 | Composite alkaline chromium-free passivating agent and preparation method and application thereof |
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Application publication date: 20181228 |