CN101210321B - Chemical passivation technique for magnesium alloy surface - Google Patents
Chemical passivation technique for magnesium alloy surface Download PDFInfo
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- CN101210321B CN101210321B CN2006101324450A CN200610132445A CN101210321B CN 101210321 B CN101210321 B CN 101210321B CN 2006101324450 A CN2006101324450 A CN 2006101324450A CN 200610132445 A CN200610132445 A CN 200610132445A CN 101210321 B CN101210321 B CN 101210321B
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Abstract
The invention provides a process for chemically passivating the surface of magnesium alloy, which mainly comprises the following steps of: (a) pre-treatment for removing surface impurities, oxide film, grease, etc. on a magnesium alloy part; (b) surface conditioning for neutralizing the surface pH value of the magnesium alloy subjected to the treatment; (c) passivation, soaking the magnesium alloypart in a chemical passivation solution, which mainly contains lithium carbonate 5 to 20 g/L, fluoride 1 to 10 g/L, metaaluminate 2 to 15 g/L, casein 2 to 15 g/L and silicate 5 to 15 g/L; (d) post-tr eatment, cleaning the magnesium alloy and baking, and carrying out subsequent process such as coating. Accordingly, a chemical film formed by the process has good adhesion and contains no elements endangering the environment such as phosphorus and chromium (VI), and the process can be used for corrosion prevention among production procedures and can reduce the surface coating difficulty of a magnesium alloy workpiece.
Description
Technical field
The present invention relates to a kind of metal surface treatment process, particularly relate to a kind of magnesium alloy surface treatment process.
Background technology
In light weight, advantages such as specific tenacity is high, Young's modulus is little, anti-electromagnetic interference, shielding is good, cushioning ability is strong, good processability, good heat conductivity that magnesium alloy has are used widely at aspects such as national defence, electronic apparatuss.But the electricity level current potential of magnesium alloy very low (2.34KV), cause its chemical stability very poor, corrosion-resistant, in most of media, magnesium alloy is all unstable.Solve the corrosion prevention problem of magnesium alloy, can be from the new non-corrosive metal of control magazine content, preparation high purity alloys, development aspect such as ion implantation and laser surface modification start with.And, adopt protective membrane and coating to handle for large-scale commercial production, be method for most economical easy row.
And the industry practice is normally carried out general chemistry conversion (being phosphatization) back application on its surface at present, but the resulting rete of present chemical conversion is at corrosion resistance and be easy to be difficult to take into account aspect the application two purpose that is difficult to reach protection against corrosion simultaneously and improves external coating sticking power.
Summary of the invention
In view of above problem, main purpose of the present invention is to provide a kind of chemical passivation technique for magnesium alloy surface, and this technology can improve the sticking power of Mg alloy surface in the etch-proof while, helps follow-up coating process.
For achieving the above object, chemical passivation technique for magnesium alloy surface provided by the invention, it mainly may further comprise the steps:
A. pre-treatment to remove magnesium alloy component surface impurity, oxide film and grease etc., can realize by approach such as sandblast, alkali cleaning, pickling and washings;
B. table is transferred, and this step is in order to the Mg alloy surface pH value of neutralization after above-mentioned processing, and described table transfers solution to can be general weak base;
C. passivation, above-mentioned magnesium alloy component be impregnated in the chemical passivation solution, this chemical passivation solution mainly comprises Quilonum Retard 5～20g/L, fluoride salt 1～10g/L, meta-aluminate 2～15g/L, sweet casein 2～15g/L, silicate 5～15g/L, and its temperature of reaction is controlled to be between 70～110 ℃, and passivation time is 10～40 minutes;
D. aftertreatment after passivation is intact, is cleaned its magnesium alloy component surface and oven dry, can carry out subsequent handlings such as application.
Wherein, in the above-mentioned chemical passivation solution formula, described fluoride salt is preferably Sodium Fluoride, and described silicate is preferably water glass.
By this, chemical passivation technique for magnesium alloy surface provided by the invention, it adopts compound and the resulting chemical passivation solution formula of mixed inorganic that contains green metal element lithium, its composition is few, be convenient to management and control, and the chemical films sticking power that is obtained by this technology is good, non-toxic sanitary, environmentally hazardous elements such as not phosphorous, sexavalent chrome, therefore, the present invention not only can be used for the protection against corrosion between production process, improves the resistance to corrosion of magnesium alloy workpiece integral surface, can also reduce the difficulty of magnesium alloy work-piece surface application, more can increase the metal luster of outward appearance.
Embodiment
Embodiment 1
Comply with following set of dispense inhibition and generation passivating dip:
Quilonum Retard 15g/L;
Sodium Fluoride 4g/L;
Meta-aluminate 10g/L;
Sweet casein 10g/L;
Water glass 10g/L.
Get an AZ31B magnesium alloy sample and carry out alkali cleaning, washing, pickling, washed with de-ionized water according to this, then this sample is placed 20% ammonia soln to show to mediate reason, then this sample be impregnated in the above-mentioned chemical passivation solution after handling washing, temperature is controlled to be 95 ℃, dipping time is 20 minutes, after the time, take out sample washing earlier oven dry again, then at this magnesium alloy sample surfaces coating metal baking vanish, it is good to dry its metal-like of resulting product, it is carried out the sticking power test, and the result is that none lattice of hundred lattice separately peel off.
Embodiment 2
Comply with following set of dispense inhibition and generation passivating dip:
Quilonum Retard 5g/L;
Sodium Fluoride 10g/L;
Meta-aluminate 6g/L;
Sweet casein 10g/L;
Water glass 12g/L.
Get an AZ31B magnesium alloy sample and carry out alkali cleaning, washing, pickling, washed with de-ionized water according to this, then this sample is placed 20% ammonia soln to show to mediate reason, then this sample be impregnated in the above-mentioned chemical passivation solution after handling washing, temperature is controlled to be 80 ℃, dipping time is 25 minutes, after the time, take out sample washing earlier oven dry again, then at this magnesium alloy sample surfaces coating metal baking vanish, it is good to dry its metal-like of resulting product, it is carried out the sticking power test, and the result is that none lattice of hundred lattice separately peel off.
Embodiment 3
Comply with following set of dispense inhibition and generation passivating dip:
Quilonum Retard 20g/L;
Sodium Fluoride 3g/L;
Meta-aluminate 10g/L;
Sweet casein 3g/L;
Water glass 5g/L.
Get an AZ31B magnesium alloy sample and carry out alkali cleaning, washing, pickling, washed with de-ionized water according to this, then this sample is placed 20% ammonia soln to show to mediate reason, then this sample be impregnated in the above-mentioned chemical passivation solution after handling washing, temperature is controlled to be 105 ℃, dipping time is 15 minutes, after the time, take out sample washing earlier oven dry again, then at this magnesium alloy sample surfaces coating metal baking vanish, it is good to dry its metal-like of resulting product, it is carried out the sticking power test, and the result is that none lattice of hundred lattice separately peel off.
Above embodiment is the detailed description that the present invention is done.Notice that these embodiments are not in order to limit the present invention, for those skilled in the art, the improvement of being made and additional should be considered as within protection scope of the present invention without departing from the spirit of the invention.
Claims (4)
1. a magnesium alloy surface chemical passivating dip is characterized in that, and is composed of the following components:
Quilonum Retard 5～20g/L;
Sodium Fluoride 1～10g/L;
Meta-aluminate 2～15g/L;
Sweet casein 2～15g/L;
Water glass 5～15g/L.
2. a chemical passivation technique for magnesium alloy surface is characterized in that, mainly may further comprise the steps:
A. pre-treatment, to remove magnesium alloy component surface impurity, oxide film and grease, its concrete technology realizes by sandblast, alkali cleaning, pickling and washing approach;
B. table is transferred, and this step is in order to the Mg alloy surface pH value of neutralization after above-mentioned processing, this magnesium alloy component is placed 20% ammoniacal liquor show to mediate reason;
C. passivation impregnated in above-mentioned magnesium alloy component in the aforesaid right requirement 1 described chemical passivation solution;
D. aftertreatment after passivation is intact, is cleaned its magnesium alloy component surface and oven dry, can spray paint and subsequent handling.
3. a kind of chemical passivation technique for magnesium alloy surface according to claim 2 is characterized in that, described passivation reaction temperature is controlled to be between 70～110 ℃.
4. a kind of chemical passivation technique for magnesium alloy surface according to claim 2 is characterized in that, described passivation time is 10～40 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101324450A CN101210321B (en) | 2006-12-29 | 2006-12-29 | Chemical passivation technique for magnesium alloy surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101324450A CN101210321B (en) | 2006-12-29 | 2006-12-29 | Chemical passivation technique for magnesium alloy surface |
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| CN101210321A CN101210321A (en) | 2008-07-02 |
| CN101210321B true CN101210321B (en) | 2010-08-18 |
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| CN2006101324450A Expired - Fee Related CN101210321B (en) | 2006-12-29 | 2006-12-29 | Chemical passivation technique for magnesium alloy surface |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102500532B (en) * | 2011-10-22 | 2014-01-22 | 国家电网公司 | Method for improving service life of hardware in highly corrosive environment |
| CN106011832B (en) * | 2016-07-04 | 2019-04-12 | 贵州铜仁金瑞锰业有限责任公司 | A kind of meta-aluminate passivating solution and its application method for electrolytic manganese metal passivation |
| CN106894011A (en) * | 2017-01-20 | 2017-06-27 | 深圳市天合兴五金塑胶有限公司 | Antioxidant magnesium alloy surface treatment process high |
| TWI685587B (en) * | 2019-01-02 | 2020-02-21 | 弘贊精密科技有限公司 | Chemical passivation film surface treatment on magnesium alloys |
| CN111575749A (en) * | 2020-05-19 | 2020-08-25 | 苏州联桓汽车紧固件有限公司 | Surface coating treatment process of high-strength fastener |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1475602A (en) * | 2002-08-16 | 2004-02-18 | 中国科学院金属研究所 | Preparation method of magnesium alloy chromeless chemical conversion film and its used film forming solution |
| CN1556248A (en) * | 2003-12-30 | 2004-12-22 | 上海交通大学 | Solution formula of magnesium, aluminium alloy surface alkaline activation technology |
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- 2006-12-29 CN CN2006101324450A patent/CN101210321B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1475602A (en) * | 2002-08-16 | 2004-02-18 | 中国科学院金属研究所 | Preparation method of magnesium alloy chromeless chemical conversion film and its used film forming solution |
| CN1556248A (en) * | 2003-12-30 | 2004-12-22 | 上海交通大学 | Solution formula of magnesium, aluminium alloy surface alkaline activation technology |
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| CN101210321A (en) | 2008-07-02 |
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Granted publication date: 20100818 Termination date: 20111229 |