CN104087884B - The purposes of a kind of metal Zincing passivation method and sequestrant - Google Patents
The purposes of a kind of metal Zincing passivation method and sequestrant Download PDFInfo
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- CN104087884B CN104087884B CN201410336135.5A CN201410336135A CN104087884B CN 104087884 B CN104087884 B CN 104087884B CN 201410336135 A CN201410336135 A CN 201410336135A CN 104087884 B CN104087884 B CN 104087884B
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- 238000002161 passivation Methods 0.000 title claims abstract description 139
- 238000000034 method Methods 0.000 title claims abstract description 68
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 32
- 239000002184 metal Substances 0.000 title claims abstract description 32
- 239000003352 sequestering agent Substances 0.000 title claims abstract description 20
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000011701 zinc Substances 0.000 claims abstract description 40
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 238000001035 drying Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 11
- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 claims abstract description 10
- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229940068041 phytic acid Drugs 0.000 claims abstract description 10
- 235000002949 phytic acid Nutrition 0.000 claims abstract description 10
- 239000000467 phytic acid Substances 0.000 claims abstract description 10
- 239000002826 coolant Substances 0.000 claims description 25
- 230000007423 decrease Effects 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 2
- 239000008399 tap water Substances 0.000 claims description 2
- 235000020679 tap water Nutrition 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 238000001816 cooling Methods 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- 230000004927 fusion Effects 0.000 abstract description 2
- 238000012856 packing Methods 0.000 abstract 1
- 235000016804 zinc Nutrition 0.000 description 37
- 238000012360 testing method Methods 0.000 description 10
- 150000003839 salts Chemical class 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 241001163841 Albugo ipomoeae-panduratae Species 0.000 description 7
- 230000007935 neutral effect Effects 0.000 description 7
- 239000007921 spray Substances 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 238000000280 densification Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 238000004880 explosion Methods 0.000 description 3
- 238000005246 galvanizing Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000013522 chelant Substances 0.000 description 2
- 230000000536 complexating effect Effects 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 239000008393 encapsulating agent Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 231100000572 poisoning Toxicity 0.000 description 2
- 230000000607 poisoning effect Effects 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 238000004532 chromating Methods 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Chemical group O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000002703 mutagenesis Methods 0.000 description 1
- 231100000350 mutagenesis Toxicity 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- -1 salt ion Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical class [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Coating With Molten Metal (AREA)
Abstract
The metal Zincing passivation method of the present invention, is mainly used in zinc-plated field, metallic surface, is particularly applied to the zinc-plated of metalwork and passivation. The present invention provides a kind of metal Zincing passivation method cooling and passivation step united two into one, step is as follows: metalwork is put into zinc pot, in high-temperature fusion zinc liquid zinc-plated, subsequently the galvanized workpiece of high temperature is transferred in cooling passivation integral pool, completing passivation reaction and cooling step, galvanized workpiece surface temperature moves out of galvanized workpiece after being reduced to 50 ~ 90 DEG C simultaneously, rapid drying, directly packing moves storehouse to outdoor. This two-in-one metal Zincing passivation method simplifies the zinc-plated technical process of metal on the one hand, drastically increases the production efficiency of technique, reduces equipment energy consumption, shortens the production cycle; Also reduce the water clock of passivating solution on the other hand, save raw materials cost, be conducive to production-scale expansion. Adopt sequestrant to be the true qualities that the galvanized workpiece after the passivator of phytic acid can make passivation possesses zinc simultaneously, can avoid because passivation drop remnants produce color spot.
Description
Technical field
The present invention relates to that metallic surface is zinc-plated and the purposes of sequestrant in the method for passivation and the zinc-plated field of metal, specifically a kind of use the chromium-free passivation liquid containing sequestrant to carry out passivation metal Zincing passivation method and the application of sequestrant in metal Zincing passivation field.
Background technology
Zincincation conventional at present generally includes following steps: is placed with by metalwork in the zinc pot of high-temperature fusion zinc and carries out pot galvanize, after zinc-plated completing, galvanized workpiece is transferred in water coolant and cools, subsequently the galvanized workpiece after cooling is transferred to and special passivation pool carries out passivation reaction, passivation film is formed on galvanized workpiece top layer, finally by the galvanized workpiece after passivation by naturally drying or the means such as heating, drying are dried process, obtain final galvanized workpiece finished product.
Carrying out in zinc-plated process, the temperature of usual fused zinc is between 420 ~ 500 DEG C, adopts the fused zinc of this temperature, it is possible to form densification, firmly zinc layers. Also some zincincation have employed the galvanizing zinc temperature on 500 DEG C, and when temperature is higher than more than 500 DEG C, the viscosity of zinc liquid reduces, and can obtain thinner zinc layers by the process of physical method, meet some clients to the specific demand of zinc coating thickness.
Usually all galvanized workpiece can be cooled after pot galvanize. If do not cooled, carry out passivation reaction under the high temperature conditions, it is possible to can make the zinc layers of galvanized workpiece that explosion occurs, make zinc layers can not play rot-resistant effect, and also can destroy outward appearance and the quality parameter of galvanized workpiece.
After metalwork pot galvanize, may expose in atmosphere in storage and transportation process or when using. In the environment such as wet condition, galvanized workpiece is not if carried out conservation treatment, and zinc layers will be quick dimmed mute, and white rust occurs, seriously affects its outward appearance.Therefore the white rust area produced in certain time after NSS neutral salt spray test is tested is the very important parameter index evaluating galvanized workpiece quality. In order to address this problem, most hot dip galvanizing process all can at the outer additional layer passivation film of zinc layers. Traditional passivation process adopts the chromic salt of trivalent and sexavalence to carry out passivation reaction as passivating solution usually, the redox reaction that make use of when it is main between zinc layers and chromic acid forms fine and close passivation layer, after chromating rete is corroded in damp atmosphere, self-regeneration can be carried out with zinc reaction, this makes galvanized workpiece have better corrosion resistance, and raw material sources are extensive, cheap. But containing extremely poison and the hexavalent chromate of carinogenicity in such passivating solution, having mutagenesis, organism and environment are had serious harm by the aerosol produced in Passivation Treatment process and the discharge of wastewater of production. And the reason of the passivating solution taken out of in follow-up drying process or envrionment conditionss such as washing away of raining also may cause chromium element to infiltrate in soil, even may flow into the places such as farmland with current, human body and ecotope all be also existed and greatly endanger. Therefore, some metal-plated zinc technology uses the unit such as molybdenum, vanadium usually substitute chromium element, adopts chromium-free passivation liquid to carry out galvanized workpiece passivation, reduces it to the murder by poisoning of organism and environment, preserve the ecological environment.
But has there is again a new problem in the metal-plated zinc technology adopting chromium-free passivation liquid, and the passivating solution containing chromium can form passivation layer fast on the surface of galvanized workpiece, but the passivating solution speed of reaction of Chrome-free is slower, it is necessary to the longer passivation reaction time. The time that current solution mainly extends passivation reaction ensures to form passivation layer best in quality, after being moved out by galvanized workpiece, in zinc layers, passivation reaction slowly occurs by the passivating solution of galvanized workpiece surface coverage from chromium-free passivation liquid. This long-time passivation process must complete in indoor, otherwise likely cannot obtain desirable passivation layer because of the impact of environmental factorss such as raining, and this greatly have impact on the efficiency of whole Zincing passivation production and processing technology. Certainly the common mode such as heat likely can be adopted to accelerate this passivation reaction, but simple heating likely causes zinc layers explosion phenomenon occur, a densification cannot be prepared, firmly and the excellent passivation layer of outward appearance, this is also the cause that usually all can first cool passivation again in conventional galvanized passivation process. There is no suitable solution in the art and can solve this technical barrier.
In addition, when traditional technology carries out passivation operation after cooling, the temperature making galvanized workpiece is reduced further, after passivation, galvanized workpiece is not easily dry, passivating solution causes weeping after being taken out of from passivation pool, special in winter, it usually needs auxiliary as oven dry waits other means to accelerate its drying process, makes zincincation more complicated.
Many metal Zincing passivation methods are also had to select different passivating solutions to make passivation layer have white or bright-coloured colour, it is possible to a small amount of passivating solution can be remained on metalwork surface, it is possible to produce color spot.
Summary of the invention
It is an object of the invention to provide a kind of metal Zincing passivation method cooling and passivation step united two into one, the method can simplify the zinc-plated technical process of metal, increases substantially the efficiency of process for processing, reduces the energy consumption of equipment; Also can rapid drying, reduce passivating solution water clock, reduce production cost.
The present invention is in order to realize above-mentioned purpose, adopt following technical scheme: the metal Zincing passivation method of the present invention comprises the steps: that (1) metalwork carries out zinc-plated in fused zinc, making zinc layers on metalwork plated surface, zinc-plated rear metalwork is the true qualities of zinc; (2) galvanized workpiece is transferred in direct-cooled passivation water coolant after completing by pot galvanize, direct-cooled passivation water coolant has played cooling galvanized workpiece simultaneously and has formed the effect of passivation layer, the high temperature of galvanized workpiece itself is utilized to accelerate passivation reaction, passivation reaction is completed fast, the temperature of direct-cooled passivation water coolant is lower than this temperature simultaneously, cools galvanized workpiece when the process of passivation reaction simultaneously; (3) after galvanized workpiece takes out from direct-cooled passivation integral pool, utilize galvanized workpiece surface temperature can rapid drying, obtain galvanized workpiece finished product.
Described in step (2), direct-cooled passivation water coolant needs to prepare in advance, is joined by passivating solution in water coolant obtained. The passivating solution adopted is chromium-free passivation liquid, wherein includes sequestering ingredient, and the massfraction that sequestrant accounts for whole direct-cooled passivation water coolant is greater than 0.1%. Sequestering ingredient can with zine ion generation complex reaction, form multiple chelate ring, the zinc complex stability formed is extremely strong. After the galvanized workpiece of high temperature is immersed in direct-cooled passivation water coolant, react with sequestrant wherein fast and fully, the crisscross crosslinked fine and close passivation film of multilayer of the netted chelation structure in space can be formed, cover the surface of metal zinc layers, be possible to prevent the explosion that zinc layers likely occurs, also can obtain densification when high temperature, the passivation layer that complete, firm and outward appearance is excellent. Therefore sequestrant is applied in the method for direct-cooled passivation, it is possible to solve the problem that must first cool passivation again in existing metal-plated zinc technology. This passivation film simultaneously, has intercepted O effectively2With the reaction of metallic surface, thus the corrosion resistance of strong metal can be added further. It is excellent that the galvanized workpiece that the inventive method obtains carries out neutral salt spray test result, and after 48 ~ 96 hours, the white rust area of galvanized workpiece is less than 5%. In addition, also can be different from technique according to galvanized workpiece specification, regulate the concentration of passivating solution in direct-cooled passivation water coolant, then produce the passivation product obtaining meeting customer demand.
In this metal galvanized passivation process, cooling and passivation step are united two into one there is greatly positively effect. The method has simplified whole technical process, reduces the energy consumption of equipment. More importantly owing to tradition adopts the technique of chromium-free passivation liquid to need the passivation time grown very much, after galvanized workpiece takes out from passivation pool, also need the restriction being subject to the storage areas such as storehouse for a long time in indoor placement with firmly passivation layer to be formed, its production efficiency and industrial scale pole. And the high temperature of the technology utilization galvanized workpiece of the present invention itself enables passivation reaction complete fast, breach it to the restriction of storage area, greatly shorten the production cycle of technique, increased substantially the efficiency of whole production and processing process. The technical scheme of the present invention has greatly application prospect.
It is characterised in that the preferred phytic acid of described sequestrant further. Phytic acid is a kind of rare metal many teeth sequestrant, containing poly-hydroxy and Tripyrophosphoric acid base in its molecule. It can not only form, with metallic zinc complexing, the complexing layer that chelate ring forms netted crisscross crosslinked densification, and can also form fine and close rete by dehydration reaction between unreacted phosphorus hydroxyl, then can form more fine and close, firm and complete passive film.Phytic acid is applied in the zinc-plated direct-cooled passivating method of metal and can obtain the metal-plated zinc product that quality is extremely good and outward appearance is also excellent. When sequestrant is phytic acid, outside ignoring the impact of the trace salt ion in water, the metal complex that itself and zinc are formed is almost colourless, what the galvanized workpiece after passivation still presented makes the true qualities of zinc, the color spot that passivating solution can be avoided to drop in galvanized workpiece remained on surface and occur, more is conducive to obtaining the galvanized workpiece of excellent outward appearance.
When further feature is also to go out galvanized workpiece from described direct-cooled passivation water coolant time shift, galvanized workpiece surface temperature is between 50 ~ 90 DEG C. Utilize 50 ~ 90 DEG C of temperature on the galvanized workpiece surface after passivation, it is possible to make its rapid drying, even if can also rapid drying in winter, after passivation, galvanized workpiece can be packed and directly be moved storehouse to outdoor, further simplify the flow process of production operation, shorten the production cycle, be more conducive to this technique expanding production. This can make the quick-drying characteristic of galvanized workpiece simultaneously, decreases the water clock of passivating solution, reduces raw materials cost.
In step (2) from zinc pot to galvanized workpiece decrease in temperature to 160 ~ 420 DEG C the transfer process of direct-cooled passivation integral pool, then be added in described direct-cooled passivation water coolant. Time in this temperature range, the speed of passivation reaction is extremely fast, and the temperature of direct-cooled passivation water coolant is lower than this temperature simultaneously, and galvanized workpiece is cooled to lower temperature when the process of passivation reaction simultaneously. In addition, galvanized workpiece for different size can also do more accurate thermal creep stress according to the different demands of passivation film.
Galvanized workpiece described in step (2) from zinc pot to the transfer time of direct-cooled passivation integral pool be 2 ~ 200 seconds, all can realize effective passivation, the galvanized workpiece of different size, thickness equal-specification can select different transfer time according to passivation demand.
The preparation water of direct-cooled passivation water coolant described in step (2) is the underground water of tap water or soft, wide material sources and cheapness, is conducive to reducing production cost.
Passivating solution pH value described in step (2) is 5.0 ~ 7.0. Wherein main component change in concentration is in positive and negative 20% scope, all can generate satisfactory passive film, and after utilizing this passivating solution passivation, metalwork NSS neutral salt spray test test result is stablized. Passivating solution is through life-time service, and wherein zinc ion concentration increase will cause galvanized workpiece outward appearance influenced, only need to simply safeguard. Described direct-cooled passivation water coolant maintaining method: first zine ion precipitation removed, adopts acid solution to adjust passivating solution pH value to 6; By titration or its main component concentration of colorimetric determination. This direct-cooled passivation water coolant easy maintenance, is conducive to the production operation of whole zincincation.
Sequestrant can be applicable in the zinc-plated direct-cooled passivating method of above-mentioned metal.
Phytic acid can be applicable in the zinc-plated direct-cooled passivating method of above-mentioned metal.
In sum, the positively effect of the present invention is as follows: the metal Zincing passivation method of the present invention and the purposes of sequestrant, be mainly used in the Zincing passivation field of metallic surface, be particularly applied to the zinc-plated of steel part and passivation. The Zincing passivation method of the present invention includes passivation step, defines passivation film on galvanized workpiece surface, it is possible to effectively prevents zinc layers and air from producing oxidizing reaction, thus plays the effect of surface protection protection against corrosion. The metalwork processed by this Zincing passivation method can form densification, complete, firmly passivation layer, and neutral salt spray test result display after passivation, within 48��96 hours, white rust area is less than 5%.What in this Zincing passivation method, passivation step adopted is chromium-free passivation liquid, avoids chromium element to the murder by poisoning of environment, is conducive to ecological environmental protection. In addition, cooling and passivation step are united two into one by this metal-plated zinc technology, the method cooling passivation integration like this greatly simplifies the zinc-plated technical process of metal, decrease the equipment energy consumption needed for technique, shorten the production cycle of Chrome-free zincincation, reduce production cost, it is to increase the efficiency of whole Chrome-free galvanized passivation process, there is sizable application prospect. In addition, in this technique after passivation galvanized workpiece can rapid drying, decrease the water clock of passivating solution, reduce the consumption of raw materials cost, after passivation, galvanized workpiece can be packed and directly be moved storehouse to outdoor, further simplify the operation of technique. Adopt the galvanized workpiece carrying out passivation containing the passivator of phytic acid will present the true qualities of metallic zinc, avoid, because passivating solution drops in the residual on galvanized workpiece surface, the phenomenon of color spot occurs.
Accompanying drawing explanation
Metal galvanized passivation process flow process in Fig. 1 prior art.
Metal galvanized passivation process flow process in Fig. 2 the present invention.
Embodiment
Below in conjunction with embodiment, invention is further described, but it is not construed as limiting the invention.
Embodiment 1:
Passivating solution is prepared: with deionized water, to prepare vanadate solution concentration be 1g/L, phytic acid concentration is the passivating solution of 5g/L, zinc-plated encapsulant (commercially available) 1g/L, regulates its PH value to be 6, obtains direct-cooled passivation water coolant 1.
Embodiment 2:
Passivating solution is prepared: the passivating solution being 1g/L with deionized water to prepare vanadate solution concentration be 0.5g/L, Weibull concentration to be 8g/L, EDETATE SODIUM salt concn be 2g/L, zinc-plated encapsulant (commercially available), regulates its PH value to be 6, obtain direct-cooled passivation water coolant 2.
The Zincing passivation method step of embodiment 1 and embodiment 2 is as follows: undertaken carrying out in 420 ~ 500 DEG C of galvanizing zincs zinc-plated by tinsel, immerse in above-mentioned direct-cooled passivation water coolant 1 or 2 when leaving zinc pot 20 seconds, the passivation reaction time is 10 ~ 30 seconds, direct-cooled passivation temperature of cooling water is 50 ~ 70 DEG C, move out of galvanized workpiece, naturally dry under normal temperature condition, obtain galvanized workpiece finished product. NSS neutral salt spray test test is carried out after 2 hours.
Neutral salt spray corrosion test (NSS) process is as follows: be placed in salt fog cabinet by sample complete for passivation, with reference to the standard of ISO3768, adopt that concentration is 5%, PH value be 6.5 ~ 7.2, temperature be that the NaCl solution of 35 �� 2 DEG C is sprayed continuously, at the end of observation experiment, there is the area of white rust in specimen surface, calculate the per-cent of specimen surface white rust, evaluate the corrosion resistance nature of sample.
Result is as shown in the table.
| The neutral salt spray test time | Surface white rust area percentage | |
| Passivating solution 1 | 72 hours | It is less than 5% |
| Passivating solution 2 | 48 hours | It is less than 5% |
In addition, also carry out resistance to elevated temperatures test, step is as follows: constant temperature roaster baking taking-up after 20 minutes continuously that the sample after passivation is put into 400 DEG C, in embodiment 1 and embodiment 2, the specimen surface of passivating solution process is without red rust, be full of cracks, illustrates that it has good resistance to elevated temperatures.
Obviously, above-described embodiment is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention. For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description. Here without the need to also cannot all enforcement modes be given exhaustive.And the apparent change that these spirit belonging to the present invention are extended out or variation are still among protection scope of the present invention.
Claims (8)
1. a metal Zincing passivation method, comprises the steps:
(1) metalwork carries out zinc-plated in fused zinc;
(2) galvanized workpiece is transferred in direct-cooled passivation water coolant after completing by pot galvanize, utilizes the high temperature of galvanized workpiece itself to complete passivation reaction fast, cools galvanized workpiece simultaneously;
(3) moving out of galvanized workpiece, drying obtains galvanized workpiece finished product;
Including chromium-free passivation liquid in direct-cooled passivation water coolant described in step (2), include sequestrant in described chromium-free passivation liquid, sequestrant shared mass percent in direct-cooled passivation water coolant is greater than 0.1%;
In step (2) in transfer process between galvanized workpiece decrease in temperature to 160 ~ 420 DEG C, then add in described direct-cooled passivation water coolant.
2. metal Zincing passivation method according to claim 1, it is characterised in that: described sequestrant is phytic acid.
3. metal Zincing passivation method according to claim 1 and 2, it is characterised in that: when moving out of galvanized workpiece from described direct-cooled passivation water coolant in step (3), galvanized workpiece surface temperature is 50 ~ 90 DEG C.
4. metal Zincing passivation method according to claim 1 and 2, it is characterised in that: the transfer time that in step (2), galvanized workpiece is transferred in direct-cooled passivation water coolant after completing by pot galvanize is 2 ~ 200 seconds.
5. metal Zincing passivation method according to claim 1 and 2, it is characterised in that: the preparation water of direct-cooled passivation water coolant and passivating solution described in step (2) is tap water or soft underground water.
6. metal Zincing passivation method according to claim 1 and 2, it is characterised in that: described in step (2), the pH value of passivating solution is 5.0 ~ 7.0.
7. a sequestrant is applied to the purposes of the described metal Zincing passivation method of the arbitrary item of claim 1 ~ 6.
8. sequestrant according to claim 7 is applied to the purposes of metal Zincing passivation method, it is characterised in that: described sequestrant is phytic acid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410336135.5A CN104087884B (en) | 2014-07-15 | 2014-07-15 | The purposes of a kind of metal Zincing passivation method and sequestrant |
| PCT/CN2014/084241 WO2016008185A1 (en) | 2014-07-15 | 2014-08-13 | Metal galvanization and passivation method, and use of chelating agent |
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| CN201410336135.5A CN104087884B (en) | 2014-07-15 | 2014-07-15 | The purposes of a kind of metal Zincing passivation method and sequestrant |
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| CN104087884B true CN104087884B (en) | 2016-06-08 |
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| JP3442524B2 (en) * | 1995-02-22 | 2003-09-02 | 日新製鋼株式会社 | Stainless steel sheet for Zn plating and manufacturing method |
| US7989028B2 (en) * | 2003-03-19 | 2011-08-02 | Allied Tube & Conduit Corporation | Continuously manufactured colored metallic products and method of manufacture of such products |
| CN102066611B (en) * | 2008-04-25 | 2013-09-18 | 汉高股份及两合公司 | Trichrome passivates for treating galvanized steel |
| CN101538706A (en) * | 2009-04-10 | 2009-09-23 | 华南理工大学 | Preparation method for corrosion-resistant rare-earth conversion film on thermal zinc-coating surface |
| CN201473580U (en) * | 2009-04-23 | 2010-05-19 | 青岛东方铁塔股份有限公司 | Zinc plating system |
| CN101580935B (en) * | 2009-06-24 | 2010-09-15 | 昆明理工大学 | Clean galvanized part silicate colorful passivating process |
| CN102776460B (en) * | 2012-03-19 | 2013-12-04 | 江苏大力神科技股份有限公司 | Production method of thin steel strip hot galvanizing |
| CN104018148B (en) * | 2014-06-25 | 2016-08-24 | 宁波华印表面工程材料科技有限公司 | Batch quantity hot dipping zinc chrome-free tanning agent and using method thereof |
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| WO2016008185A1 (en) | 2016-01-21 |
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