CN109943835A - A kind of preparation method of hot galvanized layer rare-earth salt passivation liquid - Google Patents
A kind of preparation method of hot galvanized layer rare-earth salt passivation liquid Download PDFInfo
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- CN109943835A CN109943835A CN201910361626.8A CN201910361626A CN109943835A CN 109943835 A CN109943835 A CN 109943835A CN 201910361626 A CN201910361626 A CN 201910361626A CN 109943835 A CN109943835 A CN 109943835A
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Abstract
The present invention provides a kind of preparation method of hot galvanized layer rare-earth salt passivation liquid, the passivating solution packet rare-earth salts, strong oxidizer and citric acid, the concentration of the rare-earth salts is 25-30 grams per liter, and the volume fraction of strong oxidizer is 4-6 ml ls, the concentration of citric acid is 18-22 grams per liter；The strong oxidizer and the citric acid impregnate the hot galvanized layer under the conditions of 70 degrees Celsius of temperature after preparing in proportion.The present invention adds citrate in rare earth passivating solution, can significantly improve the corrosion resistance of conversion film, and so that film is had self-healing property and effectively solve the corrosion that galvanized sheet is scratched zinc at rear scratch.In addition, the present invention does not contain chromic salts, more clean, to more environment-friendly.
Description
Technical field
The present invention relates to hot galvanized layer passivating solution more particularly to a kind of preparation methods of hot galvanized layer rare-earth salt passivation liquid.
Background technique
Plating zinc and zinc-iron alloy is the effective way for improving steel-iron components resistance to corrosion, is widely used today for shipbuilding
In many fields such as industry, mechanical industry, aviation, building.But in a humid environment, especially in hygrothermal environment, it is zinc-plated and
Zinc-iron alloy layer easily corrodes, and coating surface is made to form corrosion product --- the white rust of dark gray or white loose；Time is long
It will appear red rust, to lose anti-corrosion effect.It, must be in iron and steel parts electrogalvanizing or zinc-iron in order to improve the corrosion resistance of coating
Processing is passivated to coating after alloy, fine and close passivating film is formed on the surface of electroplated layer, to improve the anti-corrosion of components
Property.
Chromate is used for galvanized steel plain sheet anti-corrosion for a long time, but the Cr VI in chromate has carcinogenesis, right
Human body and environment have serious harm, and with the enhancing of people's environmental consciousness, sight has been turned to chromium-free deactivation method by scholars
Research.Wherein, rare earth is passivated, and because its treatment effect is suitable with chromating and nontoxic and pollution-free, is ground in chromium-free deactivation method
More and more optimistic application prospect is shown in studying carefully.
The formation of rare-earth conversion coatings covers metallic cathode reactive site, to separate oxygen and electronics in metal watch
Transfer and transmitting between face and solution, and result in the reduction of rate of metal corrosion.But single rare earth salt treatment galvanized steel
Plate haves the defects that passivation time is too long, and self-healing property and anti-corrosive properties all have much room for improvement.
Summary of the invention
The purpose of the present invention is to solve disadvantages existing in the prior art, and a kind of hot galvanized layer rare-earth salts proposed
The preparation method of passivating solution.
To achieve the above object, present invention employs following technical solutions:
A kind of preparation method of hot galvanized layer rare-earth salt passivation liquid, the passivating solution packet rare-earth salts, strong oxidizer and citric acid,
The concentration of the rare-earth salts is 25-30 grams per liter, and the volume fraction of strong oxidizer is 4-6 ml ls, the concentration of citric acid is 18-
22 grams per liters；The strong oxidizer and the citric acid prepare in proportion after under the conditions of 70 degrees Celsius of temperature to the hot dip
Zinc layers are impregnated.
Preferably, the rare-earth salts is cerium salt or lanthanum salt, and the strong oxidizer is hydrogen peroxide.
Preferably, the concentration of the citric acid is 20g grams per liter.
Preferably, the hot galvanized layer is impregnated in the passivating solution, and the soaking time is no less than 10 minutes.
Preferably, the passivating solution further includes molybdate passivating liquid, the content of inorganic nickel in the molybdate passivating liquid
For 1-3 grams per liter.
Preferably, the content of the inorganic nickel is calculated according to contained nickel ion amount.
Preferably, the inorganic nickel is nickel sulfate.
Compared with prior art, the invention has the benefit that
The present invention adds citrate in rare earth passivating solution, can since citric acid can generate complexing with rare earth ion
To be used to improve the quality and corrosion resistance of rare-earth salt passive film.The addition of citric acid can significantly improve lanthanum salt conversion film
Corrosion resistance, and so that film is had self-healing property and effectively solve the corrosion that galvanized sheet is scratched zinc at rear scratch.
Specific embodiment
To make to have further understanding to the purpose of the present invention, construction, feature and its function, hereby cooperate embodiment detailed
It is described as follows.
It is the passivating solution packet rare-earth salts, strong the present invention provides a kind of preparation method of hot galvanized layer rare-earth salt passivation liquid
Oxidant and citric acid, the concentration of the rare-earth salts are 25-30 grams per liter, the volume fraction of strong oxidizer is 4-6 ml ls,
The concentration of citric acid is 18-22 grams per liter；The strong oxidizer and the citric acid prepare in proportion after in 70 degrees Celsius of temperature
Under the conditions of the hot galvanized layer is impregnated.Rare earth passivating solution is compared to chromating liquid, more cleanliness without any pollution.It is single
Rare-earth salt processing galvanized steel plain sheet has that passivation time is too long, and strong oxidizer is added in rare-earth salts, can accelerate steel plate
Surface filming.Rare earth can be cooperateed with corrosion inhibiter and is passivated to galvanized steel plain sheet.And citric acid can be generated with rare earth ion
Therefore complexing adds citrate in rare earth passivating solution, can be used to improve the quality memory corrosion resistant of rare-earth salt passive film
Corrosion energy.
In one embodiment, the rare-earth salts is cerium salt or lanthanum salt, and the strong oxidizer is hydrogen peroxide, the cerous nitrate
Concentration be 25-30 grams per liter, the concentration of the hydrogen peroxide is 4-6 ml ls, and the concentration of the citric acid is 20g grams per liter, institute
It states hot galvanized layer to be impregnated in the passivating solution, the soaking time is no less than 10 minutes.In the process of conversion film growth
In, early period is to be deposited as dominating with cerium citrate adsorbed film, and stage is with the trivalent or tetravalence after combination reaction
Based on cerium deposition, such as Ce (OH)3/Ce2O3And Ce (OH)4/Ce2O4.When treatment temperature is 70 degrees Celsius, the processing time is 10
When or so minute, the corrosion resistance of conversion film is relatively preferable, can compare favourably with chromate conversion coating.The addition of citric acid,
So that the lanthanum citrate dissolution in corrosion process near scratch generates trivalent lanthanum ion and citrate ion, expand from film layer
It is dissipated at scratch, is formed and volume protective film is formed by zinc, oxygen, lanthanum, carbon, so as to inhibit corrosion new at scratch, improve
The self-healing property of film.
In another embodiment, the passivating solution further includes molybdate passivating liquid, inorganic nickel in the molybdate passivating liquid
The content of salt is 1-3 grams per liter, and the content of the inorganic nickel is calculated according to contained nickel ion amount, and the inorganic nickel is sulfuric acid
Nickel.Galvanized steel plain sheet is put after the completion of immersion in the above-mentioned passivating solution being composed of rare-earth salts, strong oxidizer and citrate
A period of time is set, can be impregnated again in molybdate passivating liquid, secondary passivity, the effect of inorganic nickel may be implemented
It is chiefly to facilitate the dissolution of conversion film film forming initial stage metallic matrix, for control temperature at 50-60 degrees Celsius, the time is 60-90 seconds, can
To obtain new passivating film, the corrosion resistance of galvanized sheet can be further increased.
From the above mentioned, the present invention adds citrate in rare earth passivating solution, since citric acid can be produced with rare earth ion
Raw complexing can be used to improve the quality and corrosion resistance of rare-earth salt passive film.The addition of citric acid can be mentioned significantly
The corrosion resistance of high lanthanum salt conversion film, and so that film is had self-healing property and effectively solve the corruption that galvanized sheet is scratched zinc at rear scratch
Erosion.
The present invention is described by above-mentioned related embodiment, however above-described embodiment is only to implement example of the invention.
It must be noted that the embodiment disclosed is not limiting as the scope of the present invention.On the contrary, do not depart from spirit of the invention and
It is changed and retouched made by range, belongs to scope of patent protection of the invention.
Claims (7)
1. a kind of preparation method of hot galvanized layer rare-earth salt passivation liquid, it is characterised in that: the passivating solution packet rare-earth salts, Strong oxdiative
Agent and citric acid, the concentration of the rare-earth salts are 25-30 grams per liter, and the volume fraction of strong oxidizer is 4-6 ml ls, lemon
The concentration of acid is 18-22 grams per liter；The strong oxidizer and the citric acid prepare in proportion after in 70 degrees Celsius of temperature condition
Under the hot galvanized layer is impregnated.
2. the preparation method of hot galvanized layer rare-earth salt passivation liquid as described in claim 1, it is characterised in that: the rare-earth salts is
Cerium salt or lanthanum salt, the strong oxidizer are hydrogen peroxide.
3. the preparation method of hot galvanized layer rare-earth salt passivation liquid as described in claim 1, it is characterised in that: the citric acid
Concentration is 20g grams per liter.
4. the preparation method of hot galvanized layer rare-earth salt passivation liquid as described in claim 1, it is characterised in that: the hot galvanized layer
It is impregnated in the passivating solution, the soaking time is no less than 10 minutes.
5. the preparation method of hot galvanized layer rare-earth salt passivation liquid as described in claim 1, it is characterised in that: the passivating solution is also
Including molybdate passivating liquid, the content of inorganic nickel is 1-3 grams per liter in the molybdate passivating liquid.
6. the preparation method of hot galvanized layer rare-earth salt passivation liquid as claimed in claim 5, it is characterised in that: the inorganic nickel
Content calculated according to contained nickel ion amount.
7. the preparation method of hot galvanized layer rare-earth salt passivation liquid as claimed in claim 5, it is characterised in that: the inorganic nickel
It is nickel sulfate.
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| CN201910361626.8A CN109943835A (en) | 2019-04-30 | 2019-04-30 | A kind of preparation method of hot galvanized layer rare-earth salt passivation liquid |
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| CN201910361626.8A CN109943835A (en) | 2019-04-30 | 2019-04-30 | A kind of preparation method of hot galvanized layer rare-earth salt passivation liquid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114134495A (en) * | 2021-09-13 | 2022-03-04 | 上海工程技术大学 | Method for recycling hexavalent chromium in metal passivation solution based on photocatalysis |
| CN115044896A (en) * | 2022-06-23 | 2022-09-13 | 上海聚丰热镀锌有限公司 | Hot galvanizing passivation solution and passivation method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4041091A1 (en) * | 1990-12-21 | 1992-06-25 | Metallgesellschaft Ag | METHOD FOR REFILLING CONVERSION LAYERS |
| CN101538706A (en) * | 2009-04-10 | 2009-09-23 | 华南理工大学 | Preparation method for corrosion-resistant rare-earth conversion film on thermal zinc-coating surface |
| CN104018153A (en) * | 2014-06-18 | 2014-09-03 | 上海大学 | Multi-step hot-dip galvanizing passivation method |
| CN104775110A (en) * | 2015-04-17 | 2015-07-15 | 沈阳师范大学 | Additive for restoring passivation performance of molybdate treating fluid applicable to galvanizing coat surface |
| CN108004533A (en) * | 2017-12-31 | 2018-05-08 | 天长市飞龙金属制品有限公司 | A kind of galvanized sheet passivating solution |
-
2019
- 2019-04-30 CN CN201910361626.8A patent/CN109943835A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4041091A1 (en) * | 1990-12-21 | 1992-06-25 | Metallgesellschaft Ag | METHOD FOR REFILLING CONVERSION LAYERS |
| CN101538706A (en) * | 2009-04-10 | 2009-09-23 | 华南理工大学 | Preparation method for corrosion-resistant rare-earth conversion film on thermal zinc-coating surface |
| CN104018153A (en) * | 2014-06-18 | 2014-09-03 | 上海大学 | Multi-step hot-dip galvanizing passivation method |
| CN104775110A (en) * | 2015-04-17 | 2015-07-15 | 沈阳师范大学 | Additive for restoring passivation performance of molybdate treating fluid applicable to galvanizing coat surface |
| CN108004533A (en) * | 2017-12-31 | 2018-05-08 | 天长市飞龙金属制品有限公司 | A kind of galvanized sheet passivating solution |
Non-Patent Citations (1)
| Title |
|---|
| 孔纲等: "热镀锌层柠檬酸改进型铈盐转化膜工艺", 《电镀与涂饰》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114134495A (en) * | 2021-09-13 | 2022-03-04 | 上海工程技术大学 | Method for recycling hexavalent chromium in metal passivation solution based on photocatalysis |
| CN115044896A (en) * | 2022-06-23 | 2022-09-13 | 上海聚丰热镀锌有限公司 | Hot galvanizing passivation solution and passivation method |
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