CN101956190A - Preparation and passivation process of iridescent passivant agent for zinc coating - Google Patents
Preparation and passivation process of iridescent passivant agent for zinc coating Download PDFInfo
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- CN101956190A CN101956190A CN 201010150458 CN201010150458A CN101956190A CN 101956190 A CN101956190 A CN 101956190A CN 201010150458 CN201010150458 CN 201010150458 CN 201010150458 A CN201010150458 A CN 201010150458A CN 101956190 A CN101956190 A CN 101956190A
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- passivation
- iridescent
- zinc
- zinc coating
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Abstract
The invention relates to a preparation and passivation process of an iridescent passivant agent for a zinc coating. The substances of CrO3, NaCl, KCl and the like are dissolved according to a certain rate and uniformly mixed, the pH value of the solution is adjusted by using CH3 COOH, and the temperature of passivation liquid is adjusted so that the passivation liquid is kept in the optimal process range to implement the passivation process. The obtained passivated film has high red degree, good smoothness and high ductility, so that the process has better development prospect in comparasion with the traditional tri-acid passivation process and other passivation processes.
Description
Technical field
The present invention relates to the preparation and the passivation technology of the agent of a kind of zinc coating iridescent passivation, relate in particular to preparation and the technical recipe of passivation technology and the research of technological specification of a kind of zinc coating iridescent passivation agent.
Background technology
Because the current potential of zinc is more negative than iron, when zinc-plated ironware was subjected to the corrosive medium etch, zinc at first corroded and has protected iron.After particularly zinc coating is handled the bright and beautiful passive film of generation one deck through chromic acid passivation, not only significantly improved the barrier propterty of zinc coating, and improved the decorative appearance of zinc-plated part.Therefore zinc coating is widely used in many fields such as mechanical industry, electronic industry, measurement instrument industry and light industry.Zinc is amphoteric metal, and relatively more active, the corrosion speed of zinc is slower in the atmosphere of dry and rainless, is about 0.3 micron/year; The galvanic corrosion effect can take place with sulfurous gas, carbonic acid gas, oxygen, water etc. in it in the industrial atmosphere of humidity, and its corrosion speed can reach 5.3 microns/year." bloom " of the zinc laminar surface that people see usually or " white hair " are exactly the corrosion product of zinc coating.Zinc coating is if more will speed up its corrosion when contacting with the organic materials that can volatilize some corrodibility organic gas.Zinc coating is corroded constantly attenuation of back, and this not only makes the coating outward appearance be damaged, even loses the protective capability to steel substrate.If zinc coating is carried out Passivation Treatment in the chromic acid solution of definite composition, make the zinc coating surface form the chromate film (being passive film) that a layer tissue is fine and closely woven, corrosion stability is higher after, then can improve the resistance to corrosion of zinc coating significantly.This is because chromate passivation film sticks to the zinc coating surface securely, on the one hand make zinc layer and atmospheric isolation, has slowed down obnoxious flavour in the atmosphere corrosion of coating is played the favorable mechanical provide protection; In case zinc coating passivation film part is damaged or crack place when being subjected to atomospheric corrosion on the other hand, the Cr in the passive film
6+Can make the passivation again of zinc layer, the auto-mending passive film,
While CrO
4 2-Hinder the carrying out of anodic reaction as the anode stopping agent of corrosion galvanic cell, thereby slowed down the corrosion of zinc layer greatly.So thickness is identical, the zinc coating that quality is similar, the resistance to corrosion after the Passivation Treatment can improve 7～10 times.
The method of present zinc-plated post-passivation has a lot, as methods such as green black colour passivation, silvery white passivation, black passivation, chromatic passivations.Wherein iridescent passivation is according to CrO
3Content is divided into high chromium passivating, low chromium passivating, ultralow chromium passivating and chromium-free deactivation.High chromium passivating CrO
3Content is generally at 200～350g/L, and typical technology has three sour passivation and three sour secondary passivities.Although high chromium passivating technology is ripe relatively, contaminated wastewater is serious, and cost is higher.Along with the raising of world wide environmental consciousness, low chromium chromatic passivation development is very fast, and technology is tending towards ripe.Low chromium passivating liquid CrO
3Concentration is optimum at 3～5g/L, and pH value is with 1～1.2 the best, the general 5～8s of passivation time under the room temperature.At present low chromium prescription is a lot, but composition is all similar, and color is an iris after the requirement passivation of a lot of producers.
Summary of the invention
The present invention has invented the agent of a kind of low chromium iridescent passivation in order to adapt to production requirement.
The present invention adopts CrO
3, NaCl, KCl, CH
3Materials such as COOH are formed the agent of zinc coating iridescent passivation.
Concrete preparation method of the present invention comprises the step of following order:
A. with the CrO of calculated amount
3Pour in the water of certain volume, stirring is fully dissolved it;
B. NaCl and the KCl with calculated amount pours into, stirs it is fully dissolved;
C. with the CH of calculated amount
3COOH pours into, stirs;
D. measure the passivating solution pH value with the PH test paper, and adjust within the standard;
E. control the temperature of passivating solution, it is maintained within the optimised process scope.
The zinc-plated iridescent passivation membrane crystallization of gained of the present invention is careful, and sticking power is good, and the iris area coverage is bigger than three traditional sour passivation areas, and color and luster is even.
Description of test
The present invention is by carrying out sylvite galvanized and alkaline zincate galvanizing, and compares with three sour passivation, obtained good experiment effect.Wherein, rete iris area is very little after carrying out three sour passivation, be mainly green, and adopt passivation of the present invention, rete iris area reaches the total area more than 3/4, and sticking power is good, the solidity to corrosion height, simultaneously, because the present invention adopts preparation of passivation solution simple, bath stability is easy to safeguard that this just makes the present invention have good development prospect.
Embodiment
The concrete preparation process of present embodiment is as follows:
A. weigh in the balance and get a certain amount of CrO
3, NaCl and KCl pressed powder, it is soluble in water, and fully stir, make its mixed dissolution even;
B. measure a certain amount of CH with measuring cup
3COOH reagent is poured in the above-mentioned solution, fully stirs, and with PH test paper test soln pH value, and adjust in the specialized range;
C. for sylvite galvanized, passivation at room temperature then need be heated to 30～55 ℃ for alkaline zincate galvanizing;
D. passivation time is 8～16s, and twice cleaning after the passivation increasing a hot water wash, accelerated film forming speed, and used hot blast drying.
Claims (3)
1. the preparation and the passivation technology of zinc coating iridescent passivation agent mainly comprise CrO
3, NaCl, KCl, CH
3COOH is characterized in that: CrO
33～10g/L; NaCl 4～9g/L; KCl 1g/L; CH
3COOH 4～6ml/L.
2. zinc-plated iridescent passivation agent according to claim 1, it is characterized in that: the pH value of plating bath maintains 1～2 during use.
3. zinc-plated iridescent passivation agent according to claim 1 and 2 is characterized in that: bath temperature maintains in the optimised process scope during use, and the alkaline zincate galvanizing temperature is controlled at 30～55 ℃; Sylvite galvanized room temperature gets final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010150458 CN101956190A (en) | 2010-04-20 | 2010-04-20 | Preparation and passivation process of iridescent passivant agent for zinc coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010150458 CN101956190A (en) | 2010-04-20 | 2010-04-20 | Preparation and passivation process of iridescent passivant agent for zinc coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101956190A true CN101956190A (en) | 2011-01-26 |
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ID=43483773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010150458 Pending CN101956190A (en) | 2010-04-20 | 2010-04-20 | Preparation and passivation process of iridescent passivant agent for zinc coating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103741127A (en) * | 2013-11-28 | 2014-04-23 | 苏州长风航空电子有限公司 | Passivating solution and passivation method for zinc-nickel alloy plating |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038310A (en) * | 1988-06-06 | 1989-12-27 | 国营武汉八一二厂 | Little chromium passivating technology of no nitrate radical and sulfate radical |
| CN101041900A (en) * | 2006-12-05 | 2007-09-26 | 攀枝花钢企恒升包装制品有限公司 | Zinc plating deactivation liquid |
| CN101130866A (en) * | 2007-10-11 | 2008-02-27 | 上海交通大学 | Trivalent chromium iridescent passivator with high corrosion resistance and method for making the same |
-
2010
- 2010-04-20 CN CN 201010150458 patent/CN101956190A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038310A (en) * | 1988-06-06 | 1989-12-27 | 国营武汉八一二厂 | Little chromium passivating technology of no nitrate radical and sulfate radical |
| CN101041900A (en) * | 2006-12-05 | 2007-09-26 | 攀枝花钢企恒升包装制品有限公司 | Zinc plating deactivation liquid |
| CN101130866A (en) * | 2007-10-11 | 2008-02-27 | 上海交通大学 | Trivalent chromium iridescent passivator with high corrosion resistance and method for making the same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103741127A (en) * | 2013-11-28 | 2014-04-23 | 苏州长风航空电子有限公司 | Passivating solution and passivation method for zinc-nickel alloy plating |
| CN103741127B (en) * | 2013-11-28 | 2016-02-24 | 苏州长风航空电子有限公司 | A kind of zinc-nickel alloy coating passivating solution and passivating method thereof |
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Open date: 20110126 |