CN104250766A - Brass surface chrome-free passivation solution - Google Patents
Brass surface chrome-free passivation solution Download PDFInfo
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- CN104250766A CN104250766A CN201310269108.6A CN201310269108A CN104250766A CN 104250766 A CN104250766 A CN 104250766A CN 201310269108 A CN201310269108 A CN 201310269108A CN 104250766 A CN104250766 A CN 104250766A
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- Prior art keywords
- sodium
- free passivation
- chromium
- benzotriazole
- water
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Abstract
The invention discloses a brass surface chromium-free passivation solution comprising 10-12g / L of benzotriazole, 5-8g / L of 1-phenyl - 5-tetrazole-thione, 20-22g / L of tartaric acid, 5-7g / L of sodium citrate, 5.5-6.5g / L of sodium molybdate, 3.5-4.5g / L of sodium tungstate, 15-19mL / L of hydrogen peroxide, 8-10g / L of boric acid, 12-14g / L of sodium silicate, 2-4g / L of sodium dodecyl sulfate and the balance of water.
Description
Technical field
The present invention relates to technical field of surface, particularly relate to a kind of brass surfaces chromium-free passivation liquid.
Background technology
Copper and brass very easily get rusty in an atmosphere, and for a long time, people generally adopt chromic acid passivation technique to carry out surface treatment to improve the surperficial corrosion stability of copper and brass.Although the product appearance after this art breading presents golden yellow, and have good corrosion resistance, chromic salt or chromium trioxide consumption are very large in such a process, and its chromic total add-on is up to about 250 grams per liters.According to medical information, sexavalent chrome belongs to a kind of strong carcinogen, also respiratory tract ulcer can be caused, nasal cavity septation is bored a hole, the various diseases such as toxic hepatitis, dermatitis and anaemia, very large to human health damage, the permissible discharge amount of this toxic substance of national regulation is < 0.5mg/l for this reason, but the concentration containing toxic substance in chromium acid waste liquid, higher than more than 500,000 times of national regulation index, is also difficult to make it be recycled even if expend huge cost.And these objectionable impuritiess cannot be reclaimed just mean the pollution problem that cannot fundamentally solve environment, thus also just cannot avoid working the mischief to HUMAN HEALTH that this is true.For addressing this problem, once someone adopted tannic acid to add rare chromic acid process brass surfaces, but process after workpiece color and luster poor, weather-resistance is weak, and product can not standing storage and use, and lack of material, with high costs, therefore fail extensively to be adopted by people.Somebody adopts silicate to process copper and brass surfaces in addition, although the membranous layer corrosion resistance after this art breading is good, but during owing at high temperature processing workpiece, therefore require that workpiece can not contact with each other each other, in order to avoid due to workpiece surface bonding and affect superficial film quality, therefore can not produce in enormous quantities, especially can not be used for the production in enormous quantities of timepiece and bearing part etc.Treatment process ideal at present adopts benzotriazole (BTA) Passivation Treatment copper and copper alloy surface, Surface Creation one deck tens dust is after treatment to the film of hundreds of dust, this rete is very thin is easy to scratch, being easy to again slow oxidation is in atmosphere Cu(II) BTA, appearance luster is caused to deepen gradually, aesthetic appearance is affected, and anti-salt solution or ammoniacal liquor corrosive power also lower, although film can be made to reach in containing the weakly acidic solution of NaCl
but the Corrosion Protection of this thick film is poor, color and luster is also not as acid-treated good through chromium.
Summary of the invention
The object of the invention is to propose a kind of brass surfaces chromium-free passivation liquid, this passivating solution containing chromium, does not therefore fundamentally stop the problem of the environmental pollution that chromium brings, and the copper surface passivation film of this passivating solution passivation is simultaneously fine and close, excellent corrosion resistance, and the anti-discolouring time is permanent.
For reaching this object, the present invention by the following technical solutions:
A kind of brass surfaces chromium-free passivation liquid, consisting of of this passivating solution: benzotriazole 10-12g/L, 1-phenyl-5 mercapto tetrazole 5-8g/L, tartrate 20-22g/L, Trisodium Citrate 5-7g/L, Sodium orthomolybdate 5.5-6.5g/L, sodium wolframate 3.5-4.5g/L, hydrogen peroxide 15-19ml/L, boric acid 8-10g/L, water glass 12-14g/L, sodium laurylsulfonate 2-4g/L, surplus is water.
Preferably, consisting of of this passivating solution: benzotriazole 12g/L, 1-phenyl-5 mercapto tetrazole 5g/L, tartrate 22g/L, Trisodium Citrate 5g/L, Sodium orthomolybdate 6.5g/L, sodium wolframate 3.5g/L, hydrogen peroxide 19ml/L, boric acid 8g/L, water glass 14g/L, sodium laurylsulfonate 2g/L, surplus is water.
Beneficial effect of the present invention is:
1) do not contain chromium in passivating solution of the present invention, select 1-phenyl-5 mercapto tetrazole and the composite use of benzotriazole, as main inhibiter composition; It is environmentally friendly,
2) select the composite use of hydrogen peroxide, boric acid etc. and phytic acid, brass surfaces is formed sooner and has certain thickness rete, rete is finer and close, and corrosion resistance nature is lasting, and the anti-discolouring time is permanent.
Embodiment
Embodiment one
A kind of brass surfaces chromium-free passivation liquid, consisting of of this passivating solution: benzotriazole 10g/L, 1-phenyl-5 mercapto tetrazole 8g/L, tartrate 20g/L, Trisodium Citrate 7g/L, Sodium orthomolybdate 5.5g/L, sodium wolframate 4.5g/L, hydrogen peroxide 15ml/L, boric acid 10g/L, water glass 12g/L, sodium laurylsulfonate 4g/L, surplus is water.
Embodiment two
A kind of brass surfaces chromium-free passivation liquid, consisting of of this passivating solution: benzotriazole 12g/L, 1-phenyl-5 mercapto tetrazole 5g/L, tartrate 22g/L, Trisodium Citrate 5g/L, Sodium orthomolybdate 6.5g/L, sodium wolframate 3.5g/L, hydrogen peroxide 19ml/L, boric acid 8g/L, water glass 14g/L, sodium laurylsulfonate 2g/L, surplus is water.
Embodiment three
A kind of brass surfaces chromium-free passivation liquid, consisting of of this passivating solution: benzotriazole 12g/L, 1-phenyl-5 mercapto tetrazole 5g/L, tartrate 22g/L, Trisodium Citrate 5g/L, Sodium orthomolybdate 6.5g/L, sodium wolframate 3.5g/L, hydrogen peroxide 19ml/L, boric acid 8g/L, water glass 14g/L, sodium laurylsulfonate 2g/L, surplus is water.
Claims (2)
1. a brass surfaces chromium-free passivation liquid, is characterized in that, consisting of of this passivating solution: benzotriazole 10-12g/L, 1-phenyl-5 mercapto tetrazole 5-8g/L, tartrate 20-22g/L, Trisodium Citrate 5-7g/L, Sodium orthomolybdate 5.5-6.5g/L, sodium wolframate 3.5-4.5g/L, hydrogen peroxide 15-19ml/L, boric acid 8-10g/L, water glass 12-14g/L, sodium laurylsulfonate 2-4g/L, surplus is water.
2. a kind of brass surfaces chromium-free passivation liquid as claimed in claim 1, is characterized in that, consisting of of this passivating solution: benzotriazole 12g/L, 1-phenyl-5 mercapto tetrazole 5g/L, tartrate 22g/L, Trisodium Citrate 5g/L, Sodium orthomolybdate 6.5g/L, sodium wolframate 3.5g/L, hydrogen peroxide 19ml/L, boric acid 8g/L, water glass 14g/L, sodium laurylsulfonate 2g/L, surplus is water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310269108.6A CN104250766A (en) | 2013-06-28 | 2013-06-28 | Brass surface chrome-free passivation solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310269108.6A CN104250766A (en) | 2013-06-28 | 2013-06-28 | Brass surface chrome-free passivation solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104250766A true CN104250766A (en) | 2014-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310269108.6A Pending CN104250766A (en) | 2013-06-28 | 2013-06-28 | Brass surface chrome-free passivation solution |
Country Status (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962935A (en) * | 2015-06-13 | 2015-10-07 | 周彩球 | Copper alloy acid pickling passivant |
| CN107604349A (en) * | 2017-08-24 | 2018-01-19 | 西安理工大学 | Chromium-free passivation liquid and preparation method thereof and the method using its passivation copper and copper alloy |
| CN109207973A (en) * | 2016-10-13 | 2019-01-15 | 杭州绿环保技术有限公司 | A kind of preparation method for the passivating solution replacing chromic acid passivation |
-
2013
- 2013-06-28 CN CN201310269108.6A patent/CN104250766A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962935A (en) * | 2015-06-13 | 2015-10-07 | 周彩球 | Copper alloy acid pickling passivant |
| CN109207973A (en) * | 2016-10-13 | 2019-01-15 | 杭州绿环保技术有限公司 | A kind of preparation method for the passivating solution replacing chromic acid passivation |
| CN107604349A (en) * | 2017-08-24 | 2018-01-19 | 西安理工大学 | Chromium-free passivation liquid and preparation method thereof and the method using its passivation copper and copper alloy |
| CN107604349B (en) * | 2017-08-24 | 2020-07-21 | 滁州欧瑞斯机车部件有限公司 | Chromium-free passivation solution, preparation method thereof and method for passivating copper and copper alloy by using same |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141231 |