CN104250768A - Preparation method of chromium-free passivating solution for brass surface - Google Patents
Preparation method of chromium-free passivating solution for brass surface Download PDFInfo
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- CN104250768A CN104250768A CN201310273024.XA CN201310273024A CN104250768A CN 104250768 A CN104250768 A CN 104250768A CN 201310273024 A CN201310273024 A CN 201310273024A CN 104250768 A CN104250768 A CN 104250768A
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Abstract
The invention discloses a preparation method of a chromium-free passivating solution for the brass surface. The preparation method of the passivating solution comprises the following steps: adding a proper amount of water into a reaction kettle, adding boric acid and tartaric acid, stirring until boric acid and tartaric acid are dissolved, heating to 40-50DEG C, adding benzotriazol and 1-phenyl-5-mercaptotetrazole, stirring for 6-10min to make the obtained solution uniform, cooling to room temperature, sequentially adding sodium citrate, sodium molybdate, sodium tungstate, hydrogen peroxide, sodium silicate and sodium dodecyl sulfonate according to a condition that a later substance is added after a previous substance is dissolved, stirring for 13-17min after all above substances are added, adding water to a constant volume, and adjusting the pH value to 2.5-3.5.
Description
Technical field
The present invention relates to technical field of surface, particularly relate to a kind of compound method 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 the compound method proposing a kind of brass surfaces chromium-free passivation liquid, the passivating solution of the method preparation is not containing chromium, therefore the problem of the environmental pollution that chromium brings fundamentally is stopped, 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 compound method 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; The compound method of described passivating solution is: add appropriate water in a kettle., then boric acid and tartrate is added, be stirred to dissolving, then 40-50 DEG C is warming up to, then benzotriazole and 1-phenyl-5 mercapto tetrazole is added, stirring makes it even in 6-10 minute, then Trisodium Citrate, Sodium orthomolybdate, sodium wolframate, hydrogen peroxide, water glass and sodium laurylsulfonate is added successively after cool to room temperature, a kind of material after adding after front a kind of substance dissolves, all add rear stirring 13-17 minute, then add the water constant volume of surplus, last adjust ph is 2.5-3.5.
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 compound method 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; The compound method of described passivating solution is: add appropriate water in a kettle., then boric acid and tartrate is added, be stirred to dissolving, then 40 DEG C are warming up to, then benzotriazole and 1-phenyl-5 mercapto tetrazole is added, stirring makes it even in 10 minutes, then Trisodium Citrate, Sodium orthomolybdate, sodium wolframate, hydrogen peroxide, water glass and sodium laurylsulfonate is added successively after cool to room temperature, a kind of material after adding after front a kind of substance dissolves, all add rear stirring 13 minutes, then add the water constant volume of surplus, last adjust ph is 2.5.
Embodiment two
A kind of compound method 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; The compound method of described passivating solution is: add appropriate water in a kettle., then boric acid and tartrate is added, be stirred to dissolving, then 50 DEG C are warming up to, then benzotriazole and 1-phenyl-5 mercapto tetrazole is added, stirring makes it even in 6 minutes, then Trisodium Citrate, Sodium orthomolybdate, sodium wolframate, hydrogen peroxide, water glass and sodium laurylsulfonate is added successively after cool to room temperature, a kind of material after adding after front a kind of substance dissolves, all add rear stirring 17 minutes, then add the water constant volume of surplus, last adjust ph is 3.5.
Embodiment three
A kind of compound method of brass surfaces chromium-free passivation liquid, consisting of of this passivating solution: benzotriazole 11g/L, 1-phenyl-5 mercapto tetrazole 6.5g/L, tartrate 21g/L, Trisodium Citrate 6g/L, Sodium orthomolybdate 6.0g/L, sodium wolframate 4.0g/L, hydrogen peroxide 17ml/L, boric acid 9g/L, water glass 13g/L, sodium laurylsulfonate 3g/L, surplus is water; The compound method of described passivating solution is: add appropriate water in a kettle., then boric acid and tartrate is added, be stirred to dissolving, then 45 DEG C are warming up to, then benzotriazole and 1-phenyl-5 mercapto tetrazole is added, stirring makes it even in 8 minutes, then Trisodium Citrate, Sodium orthomolybdate, sodium wolframate, hydrogen peroxide, water glass and sodium laurylsulfonate is added successively after cool to room temperature, a kind of material after adding after front a kind of substance dissolves, all add rear stirring 15 minutes, then add the water constant volume of surplus, last adjust ph is 3.0.
Claims (1)
1. a compound method for 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; The compound method of described passivating solution is: add appropriate water in a kettle., then boric acid and tartrate is added, be stirred to dissolving, then 40-50 DEG C is warming up to, then benzotriazole and 1-phenyl-5 mercapto tetrazole is added, stirring makes it even in 6-10 minute, then Trisodium Citrate, Sodium orthomolybdate, sodium wolframate, hydrogen peroxide, water glass and sodium laurylsulfonate is added successively after cool to room temperature, a kind of material after adding after front a kind of substance dissolves, all add rear stirring 13-17 minute, then add the water constant volume of surplus, last adjust ph is 2.5-3.5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310273024.XA CN104250768A (en) | 2013-06-28 | 2013-06-28 | Preparation method of chromium-free passivating solution for brass surface |
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| CN201310273024.XA CN104250768A (en) | 2013-06-28 | 2013-06-28 | Preparation method of chromium-free passivating solution for brass surface |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109487254A (en) * | 2018-11-30 | 2019-03-19 | 佛山市海明威生态科技股份有限公司 | Copper alloy chrome-free tanning agent and preparation method thereof |
| CN109680315A (en) * | 2018-12-28 | 2019-04-26 | 九江德福科技股份有限公司 | A kind of electrolytic copper foil chromium-free deactivation method |
-
2013
- 2013-06-28 CN CN201310273024.XA patent/CN104250768A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109487254A (en) * | 2018-11-30 | 2019-03-19 | 佛山市海明威生态科技股份有限公司 | Copper alloy chrome-free tanning agent and preparation method thereof |
| CN109680315A (en) * | 2018-12-28 | 2019-04-26 | 九江德福科技股份有限公司 | A kind of electrolytic copper foil chromium-free deactivation method |
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Application publication date: 20141231 |