CN101538709A - Trivalent chromium blue and white passivation solution repair additive and application thereof - Google Patents

Trivalent chromium blue and white passivation solution repair additive and application thereof Download PDF

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Publication number
CN101538709A
CN101538709A CN200910049017A CN200910049017A CN101538709A CN 101538709 A CN101538709 A CN 101538709A CN 200910049017 A CN200910049017 A CN 200910049017A CN 200910049017 A CN200910049017 A CN 200910049017A CN 101538709 A CN101538709 A CN 101538709A
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CN
China
Prior art keywords
trivalent chromium
passivation
white
passivation solution
blue
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Pending
Application number
CN200910049017A
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Chinese (zh)
Inventor
周保学
姚晨岚
李金花
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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Publication date
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Priority to CN200910049017A priority Critical patent/CN101538709A/en
Publication of CN101538709A publication Critical patent/CN101538709A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C2222/00Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
    • C23C2222/10Use of solutions containing trivalent chromium but free of hexavalent chromium

Abstract

The invention relates to trivalent chromium blue and white passivation solution repair additive and application thereof, belonging to the technical field of metal finishing. The raw material for each liter of trivalent chromium blue and white passivation solution repair additive comprises Cr<3+> compound containing 7-30g of chromium and Co<2+> compound containing 20-40g of cobalt, and the balance of pure water. The Cr<3+> compound and Co<2+> compound are dissolved in the pure water, the trivalent chromium blue and white passivation solution repair additive can be obtained after constant volume. The trivalent chromium blue and white passivation solution repair additive can effectively repair inactive trivalent chromium blue and white passivation solution, prolong the service life of passivation solution, reduce waste liquor discharging and save passivation cost.

Description

Trivalent chromium blue and white passivation solution repair additive and application thereof
Technical field
The present invention relates to a kind of trivalent chromium blue and white passivation solution repair additive, be used to repair the trivalent chromium blue and white passivation solution of inefficacy, prolong the life-span of passivating solution.The invention belongs to field of metal surface treatment technology.
Background technology
Zinc-plated is the effective way that improves iron and steel plating piece resistance to corrosion, but the surface of zinc layer is easy to corrosion, need carry out Passivation Treatment to zinc coating usually.Traditional passivation technology adopts the sexavalent chrome passivation, but sexavalent chrome is a kind of highly toxic substance, has carcinogenic teratogenesis.And the trivalent chromium passivation has and the similar character of sexavalent chrome passivation in many aspects, and toxicity but has only one of chromic percentage.
European Union (ROHs), forbids that electronics and the electrical equipment thrown on the European Union market contain 6 kinds of objectionable impuritiess such as sexavalent chrome in " about ban use of some objectionable impurities instruction in electronic and electrical equipment " of enforcement on July 1 in 2006.On February 18th, 2006, China is taken the lead by the Ministry of Information Industry and has also put into effect corresponding rules, from on March 1st, 2007, forbid being invested in market electronics and electrical equipment and contain 6 kinds of objectionable impuritiess such as sexavalent chrome, in first " two high " (high pollution, high environmental risk) product register was listed the sexavalent chrome passivating solution by national environmental protection portion in 2008.Therefore, zinc coating uses the trivalent chromium deactivating liquid of greenization to substitute the common recognition that the sexavalent chrome passivation had become the surface treatment industry already.Occurred multiple not chromyl passivating solution product in the market, and obtained large-scale application, become the main product of passivating solution, its solidity to corrosion and the ornamental passivation effect that has met or exceeded the sexavalent chrome passivating solution based on trivalent chromium.
Yet in the passivating process of trivalent chromium deactivating liquid, passivating solution can wear out gradually, ornamental and corrosion resisting property reduces, in order to keep the inactivating performance of trivalent chromium deactivating liquid, usually need constantly to add passivator, and the method for employing partial update passivating solution is to prolong the work-ing life of passivating solution, but passivating solution is after adding passivator for several times, the composition of passivating solution is seriously unbalance, often be difficult to recover the performance of passivating solution when adding former passivator again, cause passivating solution complete failure, can only discard discharging, not only cause the waste of resource, and increased the difficulty of environmental protection treatment.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of trivalent chromium blue and white passivation solution repair additive and application thereof are provided.
For realizing this purpose, the present invention repairs the trivalent chromium blue and white passivation solution that lost efficacy by add repair additive in the trivalent chromium blue and white passivation solution that lost efficacy, and prolongs the life-span of passivating solution, reduces the discharging of discarded liquid, saves the passivation cost.
Concrete technical solution of the present invention is as follows:
Trivalent chromium blue and white passivation solution repair additive of the present invention, the raw material of every liter of additive consists of, and contains the Cr of chromium 7-30g 3+Compound contains the Co of cobalt 20-40g 2+Compound, all the other are pure water.
With Cr 3+Compound, Co 2+Compound dissolution in pure water, behind the constant volume, can obtain the trivalent chromium deactivating liquid repair additive.
Wherein, described Cr 3+Compound be CrCl 3.6H 2O or Cr 2(SO 4) 3.6H 2O or Cr (NO 3) 3.9H 2O, described Co 2+Compound be CoCl 2.6H 2O or Co (NO 3) 2.6H 2O or CoSO 4.7H 2O.
The restorative procedure of useless trivalent chromium blue and white passivation solution of the present invention is, get the trivalent chromium blue and white passivation solution 1L that lost efficacy on the industrial production line, add 10~20ml trivalent chromium deactivating liquid repair additive, stir the trivalent chromium blue and white passivation solution after promptly obtaining repairing.
It is applied as trivalent chromium blue and white passivation solution after the reparation of the present invention, to repair the back trivalent chromium blue and white passivation solution, with nitre acid for adjusting pH value 2.0, regulate 20 ℃ of passivation temperatures, passivation time 25 seconds, Zincing passivation spare is after after the passivation, use the pure water washed twice, dry 5min then in 80 ℃ of baking ovens, passivation part outward appearance is the blue white of evenly light, 120~140 hours 5%NaCl neutral salt spray test time.
Technique effect of the present invention is as follows:
(1) trivalent chromium blue and white passivation solution repair additive of the present invention, can repair the trivalent chromium blue and white passivation solution of inefficacy, passivating solution after the reparation is used for the pearl opal passivation of galvanized workpiece, the passivation part is measured through the 5%NaCl of GB/T10125-1997 neutral salt spray test (NSS), its solidity to corrosion can reach more than the 120h, its outward appearance reaches bright pearl opal, can satisfy industrial requirement.
(2) application of trivalent pearl opal chromium passivating liquid repair additive of the present invention helps reducing the discharging of discarded liquid, saves the passivation production cost.
Embodiment
Below by specific embodiment technical scheme of the present invention is further described, but do not constitute limitation of the invention.
Embodiment 1:
Cr (the NO that will contain chromium 20g 3) 3.9H 2O and the CoSO that contains cobalt 30g 4.7H 2The O compound is water-soluble, is settled to 1L with pure water, gets trivalent chromium blue and white passivation solution repair additive.
Get the trivalent chromium blue and white passivation solution 1L that lost efficacy on the industrial production line, add the above-mentioned trivalent chromium deactivating liquid repair additive of 15ml, stir,, regulate 20 ℃ of passivation temperatures with the pH value 2.0 that nitric acid is regulated passivating solution, passivation time 25 seconds, Zincing passivation spare is used the pure water washed twice after after the passivation, dries 5min then in 80 ℃ of baking ovens, passivation part outward appearance is the blue white of evenly light, 120 hours 5%NaCl neutral salt spray test time.
In contrast, get the trivalent chromium blue and white passivation solution 1L that lost efficacy on the industrial production line,, regulate 20 ℃ of passivation temperatures with the pH value 2.0 that nitric acid is regulated passivating solution, passivation time 25 seconds, Zincing passivation spare is used the pure water washed twice after after the passivation, dries 5min then in 80 ℃ of baking ovens, passivation part appearance luster is pale, luminance brightness is poor, and there is mist on the surface, 5%NaCl neutral salt spray test time<48h.
In contrast, get pure water 1L, add the above-mentioned trivalent chromium deactivating liquid repair additive of 15ml, stir,, regulate 20 ℃ of passivation temperatures with the pH value 2.0 that nitric acid is regulated passivating solution, passivation time 25 seconds, Zincing passivation spare is used the pure water washed twice after after the passivation, dries 5min then in 80 ℃ of baking ovens, passivation part outward appearance is pale, luminance brightness is poor, and there is mist on the surface, 5%NaCl neutral salt spray test time<24h.
Embodiment 2:
The CrCl that will contain chromium 7g 3.6H 2O and the Co (NO that contains cobalt 40g 3) 2.6H 2The O compound is water-soluble, is settled to 1L with pure water, gets trivalent chromium blue and white passivation solution repair additive.
Get the trivalent chromium blue and white passivation solution 1L that lost efficacy on the industrial production line, add the above-mentioned trivalent chromium deactivating liquid repair additive of 20ml, stir,, regulate 20 ℃ of passivation temperatures with the pH value 2.0 that nitric acid is regulated passivating solution, passivation time 25 seconds, Zincing passivation spare is used the pure water washed twice after after the passivation, dries 5min then in 80 ℃ of baking ovens, passivation part outward appearance is the blue white of evenly light, 140 hours 5%NaCl neutral salt spray test time.
Embodiment 3:
The Cr that will contain chromium 15g 2(SO 4) 3.6H 2O and the CoCl that contains cobalt 20g 2.6H 2The O compound is water-soluble, is settled to 1L with pure water, gets trivalent chromium blue and white passivation solution repair additive.
Get the trivalent chromium blue and white passivation solution 1L that lost efficacy on the industrial production line, add the above-mentioned trivalent chromium deactivating liquid repair additive of 10ml, stir,, regulate 20 ℃ of passivation temperatures with the pH value 2.0 that nitric acid is regulated passivating solution, passivation time 25 seconds, Zincing passivation spare is used the pure water washed twice after after the passivation, dries 5min then in 80 ℃ of baking ovens, passivation part outward appearance is the blue white of evenly light, 120 hours 5%NaCl neutral salt spray test time.
Embodiment 4:
The Cr that will contain chromium 30g 2(SO 4) 3.6H 2O and the CoSO that contains cobalt 20g 4.7H 2The O compound is water-soluble, is settled to 1L with pure water, trivalent chromium blue and white passivation solution repair additive, the reparation of the trivalent chromium blue and white passivation solution that is applied to lose efficacy.

Claims (3)

1, a kind of trivalent chromium blue and white passivation solution repair additive is characterized in that the raw material of every liter of trivalent chromium blue and white passivation solution repair additive is composed as follows: the Cr that contains chromium 7-30g 3+Compound contains the Co of cobalt 20-40g 2+Compound, all the other are pure water; With described Cr 3+Compound, Co 2+Compound dissolution behind the constant volume, promptly obtains the trivalent chromium deactivating liquid repair additive in pure water.
2, a kind of trivalent chromium blue and white passivation solution repair additive of claim 1 is characterized in that: described Cr 3+Compound is CrCl 3.6H 2O, Cr 2(SO 4) 3.6H 2O or Cr (NO 3) 3.9H 2O, described Co 2+Compound is CoCl 2.6H 2O, Co (NO 3) 2.6H 2O or CoSO 4.7H 2O.
3, the application of the trivalent chromium blue and white passivation solution repair additive of claim 1, it is characterized in that: in the trivalent chromium blue and white passivation solution of every liter of inefficacy, add 10~20ml trivalent chromium deactivating liquid repair additive, stir, trivalent chromium blue and white passivation solution after promptly obtaining repairing is used for the pearl opal passivation of galvanized workpiece.
CN200910049017A 2009-04-09 2009-04-09 Trivalent chromium blue and white passivation solution repair additive and application thereof Pending CN101538709A (en)

Priority Applications (1)

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CN200910049017A CN101538709A (en) 2009-04-09 2009-04-09 Trivalent chromium blue and white passivation solution repair additive and application thereof

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Application Number Priority Date Filing Date Title
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CN101538709A true CN101538709A (en) 2009-09-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102560466A (en) * 2012-02-09 2012-07-11 宏正(福建)化学品有限公司 Method of prolonging service life of galvanized trivalent chromium passivating solution
CN103255402A (en) * 2013-05-16 2013-08-21 山东建筑大学 Non-chrome white passivator
US20140178125A1 (en) * 2012-12-21 2014-06-26 Gary Crewson Stamped clevis

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102560466A (en) * 2012-02-09 2012-07-11 宏正(福建)化学品有限公司 Method of prolonging service life of galvanized trivalent chromium passivating solution
CN102560466B (en) * 2012-02-09 2014-02-12 宏正(福建)化学品有限公司 Method of prolonging service life of galvanized trivalent chromium passivating solution
US20140178125A1 (en) * 2012-12-21 2014-06-26 Gary Crewson Stamped clevis
CN103255402A (en) * 2013-05-16 2013-08-21 山东建筑大学 Non-chrome white passivator

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Open date: 20090923