CN103924236B - The pre-black liquor of a kind of black phosphating - Google Patents
The pre-black liquor of a kind of black phosphating Download PDFInfo
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- CN103924236B CN103924236B CN201410180755.4A CN201410180755A CN103924236B CN 103924236 B CN103924236 B CN 103924236B CN 201410180755 A CN201410180755 A CN 201410180755A CN 103924236 B CN103924236 B CN 103924236B
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- trolamine
- molybdate
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- black liquor
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Abstract
The invention discloses pre-black liquor of a kind of black phosphating and preparation method thereof, by volume concentration, comprises following component: Bismuth trinitrate 0.01 ~ 1g/L, and the aqueous solution of molybdate and trolamine amounts to 5 ~ 25mL/L, mass concentration is the nitric acid 8 ~ 10mL/L of 65%, and surplus is water; In the aqueous solution of described molybdate and trolamine, by mass, molybdate: trolamine: water=1:8:11.Under normal temperature, first Bismuth trinitrate is dissolved in a small amount of water; Then slowly add the mixture of trolamine and molybdate, after fully stirring evenly, add the nitric acid that mass concentration is 65%; 1L is added water to after stirring.Pre-black liquor of the present invention is by chemosmosis, and do not fade in follow-up phosphatization, can process under normal temperature, the treatment time is short, and treatment effect is good.
Description
Technical field
What the present invention relates to is a kind of Phosphating Solution, in particular pre-black liquor of a kind of black phosphating and preparation method thereof.
Background technology
Phosphatization is conventional pretreatment technology, principle should belong to the process of chemical transformation film, be mainly used in steel surface phosphatization, and non-ferrous metal (as aluminium, zinc) part also can apply phosphatization.Phosphatization is the process that a kind of chemistry and electrochemical reaction form phosphate chemical conversion film, and the phosphate conversion film formed is referred to as phosphatize phosphate coat.
The object of phosphatization is mainly: provide protection to matrix metal, prevent metal to be corroded to a certain extent; For front bottoming of painting, improve sticking power and the anti-corrosion capability of paint film layer; Antifriction lubrication is played in metal cold complete processing.
Blackening pretreatment is the pretreatment technology before product phosphatization, and in the processing or use procedure of ferrous metal, accurately machined accessory, precision instrument accessory, blackening pretreatment is absolutely necessary.Traditional pre-black liquor adopts dyeing or oxidation to realize black in advance usually, and the effect of dyeing is also bad, does not reach the effect of black, easily fades in follow-up parkerizing process simultaneously; Whole pre-black-labour skill is comparatively complicated, needs to operate under the condition heated up, and the treatment time is also longer.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide pre-black liquor of a kind of black phosphating and preparation method thereof, achieve simple and effective blackening pretreatment.
The present invention is achieved by the following technical solutions, the present invention includes following component: Bismuth trinitrate 0.01 ~ 1g/L, and the aqueous solution of molybdate and trolamine amounts to 5 ~ 25mL/L, and mass concentration is the nitric acid 8 ~ 10mL/L of 65%, and surplus is water; In the aqueous solution of described molybdate and trolamine, by mass, molybdate: trolamine: water=1:8:11.
As one of optimal way of the present invention, described pre-black liquor comprises Bismuth trinitrate 0.5g/L, and the aqueous solution of molybdate and trolamine amounts to 8mL/L, the nitric acid 9mL/L of mass concentration 65%, and surplus is water.
A preparation method for the pre-black liquor of black phosphating, comprises the following steps:
(1), under normal temperature, first Bismuth trinitrate is dissolved in a small amount of water;
(2) then slowly add the mixture of trolamine and molybdate, after fully stirring evenly, add the nitric acid that mass concentration is 65%;
(3) 1L is added water to after stirring.
The acting as of each component in the present invention's formula:
Bismuth trinitrate: the main salt of pre-black liquor, filmogen;
Trolamine: alkaline matter, suppresses the hydrolysis of Bismuth trinitrate;
Molybdate: stablizer;
Nitric acid: provide acid, the Bismuth trinitrate of hydrolysis is dissolved again.
The present invention has the following advantages compared to existing technology: pre-black liquor of the present invention is by chemosmosis, and do not fade in follow-up phosphatization, can process under normal temperature, the treatment time is short, and treatment effect is good.
Embodiment
Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
The pre-black liquor preparation method of the present embodiment is as follows:
(1), under normal temperature, first 0.01g Bismuth trinitrate is dissolved in a small amount of water;
(2) aqueous solution then slowly adding trolamine and molybdate amounts to 5mL, adds the nitric acid that 8mL mass concentration is 65% after fully stirring evenly; In the aqueous solution of described molybdate and trolamine, by mass, molybdate: trolamine: water=1:8:11;
(3) 1L is added water to after stirring.
During use, under normal temperature, pending workpiece is put into pre-black liquor 30s ~ 5min.
Embodiment 2
The pre-black liquor preparation method of the present embodiment is as follows:
(1), under normal temperature, first 1g Bismuth trinitrate is dissolved in a small amount of water;
(2) mixture then slowly adding trolamine and molybdate amounts to 10mL, adds the nitric acid that 10mL mass concentration is 65% after fully stirring evenly; In the aqueous solution of described molybdate and trolamine, by mass, molybdate: trolamine: water=1:8:11;
(3) 1L is added water to after stirring.
During use, under normal temperature, pending workpiece is put into pre-black liquor 30s ~ 5min.
Embodiment 3
The pre-black liquor preparation method of the present embodiment is as follows:
(1), under normal temperature, first 0.5g Bismuth trinitrate is dissolved in a small amount of water;
(2) mixture then slowly adding trolamine and molybdate amounts to 8mL, adds the nitric acid that 9mL mass concentration is 65% after fully stirring evenly;
(3) 1L is added water to after stirring.
During use, under normal temperature, pending workpiece is put into pre-black liquor 30s ~ 5min.
More traditional pre-black liquor and pre-black liquor effect of the present invention as follows:
Use the present invention black in advance after, metallic surface covers the fine and closely woven black rete of one deck, and naked eyes look it is namely ater.
Claims (2)
1. the pre-black liquor of black phosphating, is characterized in that, comprises following component: Bismuth trinitrate 0.01 ~ 1g/L, and the aqueous solution of molybdate and trolamine amounts to 5 ~ 25mL/L, and mass concentration is the nitric acid 8 ~ 10mL/L of 65%, and surplus is water; In the aqueous solution of described molybdate and trolamine, by mass, molybdate: trolamine: water=1:8:11.
2. the pre-black liquor of a kind of black phosphating according to claim 1, is characterized in that, described pre-black liquor comprises Bismuth trinitrate 0.5g/L, and the aqueous solution of molybdate and trolamine amounts to 8mL/L, the nitric acid 9mL/L of mass concentration 65%, and surplus is water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410180755.4A CN103924236B (en) | 2014-04-30 | 2014-04-30 | The pre-black liquor of a kind of black phosphating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410180755.4A CN103924236B (en) | 2014-04-30 | 2014-04-30 | The pre-black liquor of a kind of black phosphating |
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| Publication Number | Publication Date |
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| CN103924236A CN103924236A (en) | 2014-07-16 |
| CN103924236B true CN103924236B (en) | 2016-02-10 |
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| CN201410180755.4A Active CN103924236B (en) | 2014-04-30 | 2014-04-30 | The pre-black liquor of a kind of black phosphating |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1405354A (en) * | 2002-11-08 | 2003-03-26 | 中国重型汽车集团有限公司 | Pretreating liquid for black bonderizing |
| CN101876070A (en) * | 2009-04-28 | 2010-11-03 | 北京科技桥科贸有限公司 | Hair blackening liquid |
| CN102140635A (en) * | 2011-03-12 | 2011-08-03 | 蚌埠市钰诚五金工贸有限公司 | Metal surface pre-blackening treatment method |
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2014
- 2014-04-30 CN CN201410180755.4A patent/CN103924236B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1405354A (en) * | 2002-11-08 | 2003-03-26 | 中国重型汽车集团有限公司 | Pretreating liquid for black bonderizing |
| CN101876070A (en) * | 2009-04-28 | 2010-11-03 | 北京科技桥科贸有限公司 | Hair blackening liquid |
| CN102140635A (en) * | 2011-03-12 | 2011-08-03 | 蚌埠市钰诚五金工贸有限公司 | Metal surface pre-blackening treatment method |
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| CN103924236A (en) | 2014-07-16 |
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