CN101096758A - Magnesium alloy surface treating method - Google Patents
Magnesium alloy surface treating method Download PDFInfo
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- CN101096758A CN101096758A CNA2006100362741A CN200610036274A CN101096758A CN 101096758 A CN101096758 A CN 101096758A CN A2006100362741 A CNA2006100362741 A CN A2006100362741A CN 200610036274 A CN200610036274 A CN 200610036274A CN 101096758 A CN101096758 A CN 101096758A
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Abstract
The invention discloses a processing method of magnesium alloy surface, which comprises the following steps: blasting sand; doing acid washing and alcaline washing; activating; proceeding chemical transformation; setting the pH value less than 6; allocating each liter of solution with 10-50g manganese hypophosphate, 1-10g tannic acid, 1-10g sodium fluoride and 1-10g sodium nitrate to transform; keeping the solution temperature at 50-100 deg. c for 10-60 min; toasting; sealing hole. The invention improves the adhesion of transmitting film of magnesium alloy with obvious hole sealing effect, which protects the magnesium alloy part effectively.
Description
Ji Intraoperative field
The present invention relates to a kind of surface treatment method of Mg alloy, particularly relate to a kind of treatment solution of harmful elements such as chromium that do not contain surface treatment method of Mg alloy.
Bei Jing Ji Intraoperative
Magnesium alloy, is widely used in the industry such as automobile, aviation, electronics with its unique advantage as alloy in lightweight.But oxidizing reaction takes place than easy betatopic in magnesium alloy, and the oxide film that forms naturally is loose porous; protective capability to magnesium matrix is poor; thereby cause the magnesium corrosion resistance poor, in corrosive medium, be easy to serious corrosion takes place, be not suitable for most corrosive environment.
Chemical oxidation claims chemical conversion to handle again, it is common a kind of surface treatment method of Mg alloy, by flooding, spraying or be coated with and rinse, metal parts is contacted with chemical oxidation liquid, by metal and treatment solution generation chemical reaction, form the passive film that constitutes by oxide compound or metal-salt in the metallic surface, magnesium alloy is carried out corrosion prevention.
Though traditional chromate treating effect is better, contains hexavalent chromium in the technology, toxicity is big, contaminate environment, and the processing cost height of waste liquid.
Summary of the invention
The invention provides a kind of the use and do not contain harmful chromic surface treatment method of Mg alloy in the chemical oxidation liquid.
A purpose of the present invention is, proposed a kind of surface treatment method of Mg alloy, and its steps in sequence is:
Sandblast is in order to decontamination with make Mg alloy surface even, after finishing, with the remaining gravel of ultrasonic cleaning Mg alloy surface;
Alkali cleaning in order to the degreasing of deoiling, uses the mixing solutions of yellow soda ash and sodium phosphate to carry out, after finishing, with ultrasonic cleaning in this step;
Pickling is gone up the residual alkali in step in order to decontamination and neutralization, uses the mixing solutions of nitric acid and oxalic acid in this step, after finishing, carries out ultrasonic cleaning;
Activation in this step, is used hydrogen fluoride solution, makes Mg alloy surface form a protective membrane, prevents in the magnesium alloy surface chemical conversion by excessive corrosion, after finishing, with washed with de-ionized water;
Magnesium alloy component is put in chemical conversion, reacts in the chemical conversion solution, on the protective membrane that produces, generates a conversion film in activation, after finishing, with washed with de-ionized water;
Baking is in order to remove moisture content and to promote the structure cell moulding;
Sealing of hole carries out in solution, improves the conversion film that generates in the chemical conversion, makes magnesium alloy component is reached the better protection effect.
Another purpose of the present invention is, proposed a kind of surface treatment method of Mg alloy, and in the chemical conversion step, it uses solution pH value should be less than 6, and contains in every liter of this solution: phosphate dihydrogen manganese 10-50g, tannic acid 1-10g, Sodium Fluoride 1-10g, SODIUMNITRATE 1-10g; During conversion was carried out, solution temperature should remain on 50-100 degree centigrade, and transformation time should be at 10-60 minute.
Another purpose of the present invention is, proposed a kind of surface treatment method of Mg alloy, and in the sealing of hole step, it uses in every liter of solution and contains: water glass 10-100g, and sweet casein 1-50g, solution temperature are controlled at 50-100 degree centigrade, and the treatment time is 10-60 minute.
Advantage of the present invention is: the mixed chemical of using organic acid and inorganic salt among the present invention transforms prescription; cost is low; corrosion resistance is outstanding; non-toxic sanitary; do not contain chromium etc. to the environment harmful element, the present invention adopts novel compound hole sealing prescription in addition, and is good to the conversion film tack of magnesium alloy; the sealing of hole effect is obvious, can better protect magnesium alloy component.
Description of drawings
Fig. 1 is the schematic flow sheet of the inventive method.
Embodiment
According to accompanying drawing in detail one embodiment of the invention are described in detail below.
Get a sample magnesium alloy component, its surface treatment step is followed successively by:
Carry out sandblasting at first, in order to decontamination with make Mg alloy surface even, after finishing, with the remaining gravel of ultrasonic cleaning Mg alloy surface;
Be alkali cleaning then, in order to the degreasing of deoiling, it uses every liter and contains: the solution of yellow soda ash 10g, sodium phosphate 10g is handled, after finishing, with ultrasonic cleaning;
Be pickling again, go up the residual alkali in step in order to decontamination and neutralization, its functional quality mark is that 8% nitric acid and the sulfuric acid mixed solution of 1g/L are handled, and after finishing, carries out ultrasonic cleaning;
Then be to activate, the functional quality mark is 10% hydrogen fluoride solution in this step, produces the protective membrane of a magnesium fluoride at Mg alloy surface, prevents that Mg alloy surface is corroded, after finishing, with washed with de-ionized water;
Carry out chemical conversion then, magnesium alloy component is put into chemical conversion solution, this solution pH value should be less than 6, and contain in every liter: transform in the solution of phosphate dihydrogen manganese 10-50g, tannic acid 1-10g, Sodium Fluoride 1-10g, SODIUMNITRATE 1-10g, solution temperature should remain on 50-100 degree centigrade, and transformation time should be at 10-60 minute; On the protective membrane that produces in above-mentioned activation step, regeneration one conversion film is after finishing, with washed with de-ionized water;
Toast, it is under 180 degrees centigrade drying temperature, and drying 30 minutes is in order to remove moisture content and to promote the structure cell moulding;
Last sealing of hole, it contains in every liter: carry out in the solution of water glass 10-100g, sweet casein 1-50g, solution temperature is controlled at 50-100 degree centigrade, and the treatment time is 10-60 minute; Utilize this step to improve the conversion film that generates in the chemical conversion, make magnesium alloy component is reached the better protection effect.
The technology that Mg alloy surface is handled is finished; the mixed chemical of using organic acid and inorganic salt among the present invention transforms prescription; cost is low; corrosion resistance is outstanding, and non-toxic sanitary does not contain chromium etc. to the environment harmful element; the present invention adopts novel compound hole sealing prescription in addition; conversion film tack to magnesium alloy is good, and the sealing of hole effect is obvious, can better protect magnesium alloy component.
Claims (3)
1. surface treatment method of Mg alloy, it is characterized in that: its steps in sequence is
The remaining gravel of Mg alloy surface is cleaned in sandblast then;
Alkali cleaning, the mixing solutions of use yellow soda ash and sodium phosphate after finishing, cleans in this step;
Pickling, the mixing solutions of use nitric acid and oxalic acid after finishing, cleans in this step;
Hydrogen fluoride solution is used in activation, makes Mg alloy surface form a protective membrane, after finishing, cleans;
Chemical conversion, magnesium alloy component reacts in chemical conversion solution, on the protective membrane that produces in activation, generates a conversion film, after finishing, cleans;
Baking;
Sealing of hole.
2. a kind of surface treatment method of Mg alloy according to claim 1 is characterized in that: in the chemical conversion step, it uses in every liter of solution and contains: phosphate dihydrogen manganese 10-50g, tannic acid 1-10g, Sodium Fluoride 1-10g, SODIUMNITRATE 1-10g; During conversion was carried out, solution temperature should remain on 50-100 degree centigrade, and the solution pH value should be less than 6, and transformation time should be at 10-60 minute.
3. a kind of surface treatment method of Mg alloy according to claim 1, it is characterized in that: in the sealing of hole step, it uses in every liter of solution and contains: water glass 10-100g, sweet casein 1-50g, solution temperature is controlled at 50-100 degree centigrade, and the treatment time is 10-60 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100362741A CN100529179C (en) | 2006-06-30 | 2006-06-30 | Magnesium alloy surface treating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100362741A CN100529179C (en) | 2006-06-30 | 2006-06-30 | Magnesium alloy surface treating method |
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| CN101096758A true CN101096758A (en) | 2008-01-02 |
| CN100529179C CN100529179C (en) | 2009-08-19 |
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| CNB2006100362741A Expired - Fee Related CN100529179C (en) | 2006-06-30 | 2006-06-30 | Magnesium alloy surface treating method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949010A (en) * | 2010-09-25 | 2011-01-19 | 郑州大学 | Surface pretreatment solution and pretreatment method used for bonding magnesium alloys |
| WO2011080165A1 (en) | 2009-12-31 | 2011-07-07 | Henkel Ag & Co. Kgaa | Surface treatment composition and solution for light metals or alloys thereof and surface treatment method |
| CN105483684A (en) * | 2015-11-27 | 2016-04-13 | 贵州航天风华精密设备有限公司 | Corrosion resistance processing method for surface of magnesium alloy or aluminum alloy |
| CN107916430A (en) * | 2017-11-18 | 2018-04-17 | 张晓娟 | A kind of stamping die surface treatment method |
| CN108237112A (en) * | 2017-12-25 | 2018-07-03 | 温州万虹阀门有限公司 | A kind of environment-friendly type stainless cast steel part table plane polarizedl ight and ultrasonic cleaning process |
-
2006
- 2006-06-30 CN CNB2006100362741A patent/CN100529179C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011080165A1 (en) | 2009-12-31 | 2011-07-07 | Henkel Ag & Co. Kgaa | Surface treatment composition and solution for light metals or alloys thereof and surface treatment method |
| CN101949010A (en) * | 2010-09-25 | 2011-01-19 | 郑州大学 | Surface pretreatment solution and pretreatment method used for bonding magnesium alloys |
| CN105483684A (en) * | 2015-11-27 | 2016-04-13 | 贵州航天风华精密设备有限公司 | Corrosion resistance processing method for surface of magnesium alloy or aluminum alloy |
| CN107916430A (en) * | 2017-11-18 | 2018-04-17 | 张晓娟 | A kind of stamping die surface treatment method |
| CN108237112A (en) * | 2017-12-25 | 2018-07-03 | 温州万虹阀门有限公司 | A kind of environment-friendly type stainless cast steel part table plane polarizedl ight and ultrasonic cleaning process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100529179C (en) | 2009-08-19 |
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Granted publication date: 20090819 Termination date: 20120630 |