CN103924236A - Black phosphating pre-blackening solution and preparation method thereof - Google Patents
Black phosphating pre-blackening solution and preparation method thereof Download PDFInfo
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- CN103924236A CN103924236A CN201410180755.4A CN201410180755A CN103924236A CN 103924236 A CN103924236 A CN 103924236A CN 201410180755 A CN201410180755 A CN 201410180755A CN 103924236 A CN103924236 A CN 103924236A
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Abstract
The invention discloses a black phosphating pre-blackening solution and a preparation method thereof. The black phosphating pre-blackening solution comprises the following components in concentration by volume: 0.01-1g/L of bismuth nitrate, 5-25mL/L of aqueous solution of molybdate and triethanolamine, 8-10mL/L of 65% nitric acid, and the balance of water, wherein in the aqueous solution of molybdate and triethanolamine, the mass ratio of molybdate to triethanolamine to water is 1: 8: 11. The preparation method comprises the steps of dissolving bismuth nitrate into a small amount of water at normal temperature; then slowly adding a mixture of triethanolamine and molybdate, fully stirring, and adding 65% nitric acid; stirring uniformly and then adding water to 1L. The pre-blackening solution does not fade in subsequent phosphating through chemosmosis and can be treated at normal temperature, the treatment time is short, and the 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, should belong to the processing of chemical transformation film in principle, is mainly used in steel surface phosphatization, and non-ferrous metal (as aluminium, zinc) part also can be applied phosphatization.Phosphatization is the process that a kind of chemistry and electrochemical reaction form phosphate chemical conversion film, and the phosphate conversion film forming is referred to as phosphatize phosphate coat.
The object of phosphatization is mainly: provide protection to matrix metal, prevent that to a certain extent metal is corroded; The front bottoming that is used for painting, improves sticking power and the anti-corrosion capability of paint film layer; In metal cold complete processing, play antifriction lubrication.
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.It is black in advance that traditional pre-black liquor adopts dyeing or oxidation to realize conventionally, and the effect of dyeing is also bad, do not reach the effect of black, easily fades in follow-up parkerizing process simultaneously; Whole pre-black-labour skill is comparatively complicated, need under the condition heating up, operate, 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, pre-black liquor of a kind of black phosphating and preparation method thereof is provided, realized simple and effective blackening pretreatment.
The present invention is achieved by the following technical solutions, and the present invention is concentration by volume, comprises following component: Bismuth trinitrate 0.01～1g/L, and the aqueous solution of molybdate and trolamine amounts to 5～25mL/L, nitric acid 8～10mL/L that mass concentration is 65%, 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, by volume concentration, described pre-black liquor comprises Bismuth trinitrate 0.5g/L, the aqueous solution of molybdate and trolamine amounts to 8mL/L, the nitric acid 9mL/L of mass concentration 65%, 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, adding mass concentration is 65% nitric acid;
(3) add water to 1L after stirring.
The acting as of each component in the present invention 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, by chemosmosis, does not fade in follow-up phosphatization, under normal temperature, can process, and the treatment time is short, and treatment effect is good.
Embodiment
Below embodiments of the invention are elaborated, the present embodiment is implemented under taking technical solution of the present invention as prerequisite, provided 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) then slowly add the aqueous solution of trolamine and molybdate to amount to 5mL, after fully stirring evenly, adding 8mL mass concentration is 65% nitric acid; In the aqueous solution of described molybdate and trolamine, by mass, molybdate: trolamine: water=1:8:11;
(3) add water to 1L after stirring.
When 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) then slowly add the mixture of trolamine and molybdate to amount to 10mL, after fully stirring evenly, adding 10mL mass concentration is 65% nitric acid; In the aqueous solution of described molybdate and trolamine, by mass, molybdate: trolamine: water=1:8:11;
(3) add water to 1L after stirring.
When 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) then slowly add the mixture of trolamine and molybdate to amount to 8mL, after fully stirring evenly, adding 9mL mass concentration is 65% nitric acid;
(3) add water to 1L after stirring.
When 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 are as follows:
After use the present invention is pre-black, metallic surface covers the fine and closely woven black rete of one deck, and naked eyes look it is ater.
| ? | The pre-black liquor of tradition | Pre-black liquor of the present invention |
Claims (3)
1. the pre-black liquor of black phosphating, is characterized in that, 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, nitric acid 8～10mL/L that mass concentration is 65%, 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, by volume concentration, and described pre-black liquor comprises Bismuth trinitrate 0.5g/L, the aqueous solution of molybdate and trolamine amounts to 8mL/L, the nitric acid 9mL/L of mass concentration 65%, surplus is water.
3. a preparation method for the pre-black liquor of black phosphating as claimed in claim 1, is characterized in that, 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, adding mass concentration is 65% nitric acid;
(3) add water to 1L after stirring.
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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| CN103924236A true CN103924236A (en) | 2014-07-16 |
| CN103924236B CN103924236B (en) | 2016-02-10 |
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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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| CN103924236B (en) | 2016-02-10 |
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