CN103526258A - Two-step cast aluminium alloy micro-arc oxidation treatment method - Google Patents
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- CN103526258A CN103526258A CN201310427048.6A CN201310427048A CN103526258A CN 103526258 A CN103526258 A CN 103526258A CN 201310427048 A CN201310427048 A CN 201310427048A CN 103526258 A CN103526258 A CN 103526258A
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Abstract
The invention provides a two-step cast aluminium alloy micro-arc oxidation treatment method, relates to a preparation method of a micro-arc oxidation film and in particular relates to a method for preparing a pre-oxidation film and a micro-arc oxidation film on the surface of the cast aluminium alloy. The two-step cast aluminium alloy micro-arc oxidation treatment method comprises the following processing steps: (1) placing a cast aluminium alloy sample into electrolyte, and carrying out pre-oxidation treatment; (2) washing and drying the preoxidized cast aluminium alloy sample; (3) placing the dried cast aluminium alloy sample into the electrolyte and carrying out micro-arc oxidation treatment; (4) washing and drying the cast aluminium alloy sample subjected to the micro-arc oxidation treatment. The two-step cast aluminium alloy micro-arc oxidation treatment method has the advantages that the problem that energy consumption is high in a cast aluminium alloy micro-arc oxidation process is solved, power consumption in the cast aluminium alloy micro-arc oxidation treatment is obviously reduced, micro-arc oxidation time is shortened, no pollution to the environment is produced, and significance and practical value are provided in popularization and application of a micro-arc oxidation technology in the field of cast aluminium alloy workpiece surface protection.
Description
Technical field
The present invention relates to the preparation method of differential arc oxidation film layer, particularly on cast aluminium alloy surface, prepare the method for preoxidation film and micro-arc oxidation films.
Background technology
Aluminium diecast alloy has the advantages such as density is little, specific tenacity is high, easy machine-shaping, is therefore widely used in the offshore set-ups such as the national defense industry such as aerospace, transportation and boats and ships, submarine.But owing to having added in aluminium alloy in various alloying elements, particularly high strength cast aluminum alloys, contain the elements such as Si, Cu, Mg, increased corrosion susceptibility, under atmospheric environment, all may produce corrosion and destroy, be secondly that surface hardness is lower, easily wearing and tearing.Therefore for Die-casting Products of Aluminum Alloy, must take effective surface treatment measure, to strengthen its erosion resistance and surface hardness.
Differential arc oxidation is one of study hotspot of aluminum alloy surface strengthening process field.Differential arc oxidation film layer compact structure, hardness are high, can significantly strengthen the characteristics such as wear-resisting, corrosion-resistant, the insulation of aluminum alloy surface and high temperature resistance impact.The differential arc oxidation of aluminium diecast alloy is processed and is had the problems such as arcing time is long, current density is large, energy consumption is higher at present, has limited application and the popularization of this technology at field of industrial production.Therefore shorten arcing time, reduce current density, reduce energy consumption, further the applying in aluminium diecast alloy field of surface treatment for differential arc oxidization technique, and extend Die-casting Products of Aluminum Alloy work-ing life and expand its range of application, there is important theory significance and using value.
Summary of the invention
The object of the present invention is to provide a kind of two step method cast aluminum alloy micro-arc oxidation treatment process, shorten cast aluminum alloy micro-arc oxidation arcing time, reduce differential arc oxidation and process current density, thereby reduce, process energy consumption.The method can make cast aluminum alloy micro-arc oxidation process required current density decline more than 80%.
Two step method cast aluminum alloy micro-arc oxidation treatment process of the present invention is carried out according to following steps:
(1) cast aluminium alloy pre-oxidation treatment: use deionized water to rinse 1min to cast aluminium alloy sample, then put into electrolytic solution, take cast aluminium alloy sample as anodal, stainless steel plate is negative pole, pre-oxidation treatment 5 ~ 10min in electrolytic solution, electrolyte temperature is 15 ~ 55 ℃, and current density is 1.0 ~ 5.0A/dm
2, pulsed voltage is 150 ~ 350V, and pulse-repetition is 400Hz, and dutycycle is 5 ~ 10%;
(2) the cast aluminium alloy sample after step (1) processing is taken out, use deionized water rinsing 1min, 15 ~ 35 ℃ of dry 30min;
(3) cast aluminum alloy micro-arc oxidation is processed: the cast aluminium alloy sample after step (2) is processed is put into electrolytic solution, take cast aluminium alloy sample as anodal, and stainless steel plate is negative pole, and in electrolytic solution, differential arc oxidation is processed 10 ~ 30min, electrolyte temperature is 25 ~ 45 ℃, and current density is 0.5 ~ 2.5A/dm
2, pulsed voltage is 200 ~ 450V, and pulse-repetition is 400 ~ 800Hz, and dutycycle is 10 ~ 20%;
(4) the cast aluminium alloy sample after step (3) is processed takes out, and uses deionized water rinsing 1min, and 100 ~ 120 ℃ of dry 30min obtain having the cast aluminium alloy sample of the differential arc oxidation film layer of even compact;
Wherein the electrolytic solution described in step (1), (3) is to take deionized water as solvent, and the sodium hydroxide solution that the sodium hexametaphosphate solution that is 10 ~ 50g/L by concentration and concentration are 2 ~ 10g/L forms.
The Si content of cast aluminium alloy of the present invention is at 5 ~ 35wt%.
Advantage of the present invention is to shorten the arcing time that cast aluminum alloy micro-arc oxidation is processed, and significantly reduces the current density of differential arc oxidation, thereby reach, enhances productivity, reduces the object of processing energy consumption.For differential arc oxidization technique, further the applying of aluminium diecast alloy field of surface treatment, and extend Die-casting Products of Aluminum Alloy work-ing life and expand its range of application, thering is important theory significance and using value.
Embodiment
Embodiment 1
(1) cast aluminium alloy that is 9wt% to Si content carries out pre-oxidation treatment.Electrolyte temperature is 15 ~ 55 ℃, and current density is 1.0 ~ 3.0A/dm
2, pulsed voltage is 150 ~ 350V, and pulse-repetition is 400Hz, and dutycycle is 10%, and the treatment time is 5min.Electrolyte prescription is: Sodium hexametaphosphate 99 10 ~ 50g/L, sodium hydroxide 2 ~ 10g/L;
(2) the cast aluminium alloy sample after step (1) processing is taken out, use deionized water rinsing 1min, 15 ~ 35 ℃ of dry 30min;
(3) the cast aluminium alloy sample after step (2) processing is carried out to differential arc oxidation processing.Electrolyte temperature is 25 ~ 45 ℃, and current density is 0.5 ~ 1.0A/dm
2, pulsed voltage is 200 ~ 400V, and pulse-repetition is 400Hz, and dutycycle is 20%, and the treatment time is 10min.Electrolyte prescription is: Sodium hexametaphosphate 99 10 ~ 50g/L, sodium hydroxide 2 ~ 10g/L;
(4) the cast aluminium alloy sample after step (3) processing is taken out, use deionized water rinsing 1min, 100 ~ 120 ℃ of dry 30min.
Embodiment 2
(1) cast aluminium alloy that is 18wt% to Si content carries out pre-oxidation treatment.Electrolyte temperature is 15 ~ 55 ℃, and current density is 2.0 ~ 3.0A/dm
2, pulsed voltage is 150 ~ 350V, and pulse-repetition is 400Hz, and dutycycle is 8%, and the treatment time is 5min.Electrolyte prescription is: Sodium hexametaphosphate 99 10 ~ 50g/L, sodium hydroxide 2 ~ 10g/L;
(2) the cast aluminium alloy sample after step (1) processing is taken out, use deionized water rinsing 1min, 15 ~ 35 ℃ of dry 30min;
(3) the cast aluminium alloy sample after step (2) processing is carried out to differential arc oxidation processing.Electrolyte temperature is 25 ~ 45 ℃, and current density is 1.0 ~ 1.5A/dm
2, pulsed voltage is 200 ~ 400V, and pulse-repetition is 600Hz, and dutycycle is 15%, and the treatment time is 10min.Electrolyte prescription is: Sodium hexametaphosphate 99 10 ~ 50g/L, sodium hydroxide 2 ~ 10g/L;
(4) the cast aluminium alloy sample after step (3) processing is taken out, use deionized water rinsing 1min, 100 ~ 120 ℃ of dry 30min.
Embodiment 3
(1) cast aluminium alloy that is 35wt% to Si content carries out pre-oxidation treatment.Electrolyte temperature is 15 ~ 55 ℃, and current density is 3.0 ~ 5.0A/dm
2, pulsed voltage is 150 ~ 350V, and pulse-repetition is 400Hz, and dutycycle is 5%, and the treatment time is 10min.Electrolyte prescription is: Sodium hexametaphosphate 99 10 ~ 50g/L, sodium hydroxide 2 ~ 10g/L;
(2) the cast aluminium alloy sample after step (1) processing is taken out, use deionized water rinsing 1min, 15 ~ 35 ℃ of dry 30min;
(3) the cast aluminium alloy sample after step (2) processing is carried out to differential arc oxidation processing.Electrolyte temperature is 25 ~ 45 ℃, and current density is 1.5 ~ 2.5A/dm
2, pulsed voltage is 250 ~ 450V, and pulse-repetition is 800Hz, and dutycycle is 10%, and the treatment time is 20min.Electrolyte prescription is: Sodium hexametaphosphate 99 10 ~ 50g/L, sodium hydroxide 2 ~ 10g/L;
(4) the cast aluminium alloy sample after step (3) processing is taken out, use deionized water rinsing 1min, 100 ~ 120 ℃ of dry 30min.
The cast aluminium alloy pre-oxidation treatment energy parameter that table 1 Si content is 9wt%
[0012]the cast aluminum alloy micro-arc oxidation that table 2 Si content is 9wt% is processed energy parameter
[0013]the cast aluminium alloy pre-oxidation treatment energy parameter that table 3 Si content is 18wt%
[0014]the cast aluminum alloy micro-arc oxidation that table 4 Si content is 18wt% is processed energy parameter
[0015]the cast aluminium alloy pre-oxidation treatment energy parameter that table 5 Si content is 35wt%
[0016]the cast aluminum alloy micro-arc oxidation that table 6 Si content is 35wt% is processed energy parameter
Claims (8)
1. a two step method cast aluminum alloy micro-arc oxidation treatment process, is characterized in that, before cast aluminum alloy micro-arc oxidation is processed, first carrying out pre-oxidation treatment, then carries out differential arc oxidation, according to following steps, carries out:
(1) cast aluminium alloy pre-oxidation treatment: use deionized water to rinse 1min to cast aluminium alloy sample, then put into electrolytic solution, take cast aluminium alloy sample as anodal, stainless steel plate is negative pole, pre-oxidation treatment 5 ~ 10min in electrolytic solution;
(2) the cast aluminium alloy sample after step (1) processing is taken out, use deionized water rinsing 1min, dry;
(3) cast aluminum alloy micro-arc oxidation is processed: the cast aluminium alloy sample after step (2) is processed is put into electrolytic solution, take cast aluminium alloy sample as anodal, and stainless steel plate is negative pole, and in electrolytic solution, differential arc oxidation is processed 10 ~ 30min;
(4) the cast aluminium alloy sample after step (3) is processed takes out, and use deionized water rinsing 1min, is dried, and obtains having the cast aluminium alloy sample of the differential arc oxidation film layer of even compact.
2. two step method cast aluminum alloy micro-arc oxidation treatment process according to claim 1, it is characterized in that the electrolytic solution described in step (1) is to take deionized water as solvent, the sodium hydroxide solution that the sodium hexametaphosphate solution that is 10 ~ 50g/L by concentration and concentration are 2 ~ 10g/L forms.
3. two step method cast aluminum alloy micro-arc oxidation treatment process according to claim 1, is characterized in that the electrolyte temperature described in step (1) is 15 ~ 55 ℃, and current density is 1.0 ~ 5.0A/dm
2, pulsed voltage is 150 ~ 350V, and pulse-repetition is 400Hz, and dutycycle is 5 ~ 10%.
4. two step method cast aluminum alloy micro-arc oxidation treatment process according to claim 1, is characterized in that the drying temperature described in step (2) is 15 ~ 35 ℃.
5. two step method cast aluminum alloy micro-arc oxidation treatment process according to claim 1, it is characterized in that the electrolytic solution described in step (3) is to take deionized water as solvent, the sodium hydroxide solution that the sodium hexametaphosphate solution that is 10 ~ 50g/L by concentration and concentration are 2 ~ 10g/L forms.
6. two step method cast aluminum alloy micro-arc oxidation treatment process according to claim 1, is characterized in that the electrolyte temperature described in step (3) is 25 ~ 45 ℃, and current density is 0.5 ~ 2.5A/dm
2, pulsed voltage is 200 ~ 450V, and pulse-repetition is 400 ~ 800Hz, and dutycycle is 10 ~ 20%.
7. two step method cast aluminum alloy micro-arc oxidation treatment process according to claim 1, is characterized in that the drying temperature described in step (4) is 100 ~ 120 ℃.
8. two step method cast aluminum alloy micro-arc oxidation treatment process according to claim 1, is characterized in that the Si content of described cast aluminium alloy is at 5 ~ 35wt%.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820832A (en) * | 2014-03-12 | 2014-05-28 | 湖南大学 | Two-step micro-arc oxidation method for producing super wear-resistant coating on surface of aluminium alloy |
| CN105239127A (en) * | 2015-11-13 | 2016-01-13 | 哈尔滨东安发动机（集团）有限公司 | Micro-arc oxidation method for cast aluminium alloy semi-closed inner cavity |
| CN107604411A (en) * | 2017-11-08 | 2018-01-19 | 江门市江海区杰德化工有限公司 | A kind of aluminum alloy differential arc oxidation processing method |
| CN107740166A (en) * | 2017-11-24 | 2018-02-27 | 南宁可煜能源科技有限公司 | A kind of differential arc oxidation method of solar panels aluminium frame |
| CN107974700A (en) * | 2017-12-08 | 2018-05-01 | 佛山市高明高盛铝业有限公司 | A kind of preparation process of high rigidity red oxidized aluminum alloy layer |
| WO2018128771A1 (en) * | 2017-01-06 | 2018-07-12 | Mks Instruments, Inc. | Protective oxide coating with reduced metal concentrations |
| CN109252200A (en) * | 2018-11-05 | 2019-01-22 | 佛山市南海镕信金属制品有限公司 | A kind of aluminum alloy die casting surface treatment method |
| CN109487270A (en) * | 2018-11-22 | 2019-03-19 | 江苏珀然股份有限公司 | A kind of wheel surface anti-oxidation processing method |
| CN111118571A (en) * | 2018-10-31 | 2020-05-08 | 华孚精密科技(马鞍山)有限公司 | Aluminum alloy micro-arc oxidation electrolyte, method and product thereof |
| CN111118570A (en) * | 2018-10-31 | 2020-05-08 | 华孚精密科技(马鞍山)有限公司 | Die-casting aluminum alloy micro-arc oxidation electrolyte, method and product thereof |
| US10871256B2 (en) | 2015-07-27 | 2020-12-22 | Schlumberger Technology Corporation | Property enhancement of surfaces by electrolytic micro arc oxidation |
| CN112323114A (en) * | 2020-11-04 | 2021-02-05 | 西安赛福斯材料防护有限责任公司 | Preparation method of wear-resistant insulating film layer on surface of titanium alloy ball valve |
| CN113355715A (en) * | 2021-04-30 | 2021-09-07 | 上海交通大学 | Method for improving micro-arc oxidation film forming rate of zirconium alloy surface |
| CN114059128A (en) * | 2021-11-29 | 2022-02-18 | 广东广特电气股份有限公司 | Preparation method of ceramic membrane covered wire with high adhesion |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006312754A (en) * | 2005-04-04 | 2006-11-16 | Miyaki:Kk | Treatment method for surface of anodized aluminum |
| CN201358320Y (en) * | 2009-01-14 | 2009-12-09 | 蔡乐勤 | Positive pole oxidation film on aluminum alloy surface |
| CN101880904A (en) * | 2010-07-15 | 2010-11-10 | 南昌航空大学 | Method for cast aluminum alloy micro-arc oxidation pretreatment |
-
2013
- 2013-09-18 CN CN201310427048.6A patent/CN103526258A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006312754A (en) * | 2005-04-04 | 2006-11-16 | Miyaki:Kk | Treatment method for surface of anodized aluminum |
| CN201358320Y (en) * | 2009-01-14 | 2009-12-09 | 蔡乐勤 | Positive pole oxidation film on aluminum alloy surface |
| CN101880904A (en) * | 2010-07-15 | 2010-11-10 | 南昌航空大学 | Method for cast aluminum alloy micro-arc oxidation pretreatment |
Non-Patent Citations (1)
| Title |
|---|
| 刘耀辉等: "AZ91镁合金在磷酸盐体系中微弧氧化的工艺研究", 《铸造》 * |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820832B (en) * | 2014-03-12 | 2016-03-23 | 湖南大学 | A kind of two step micro-arc oxidations generating super abrasive coating in aluminum alloy surface |
| CN103820832A (en) * | 2014-03-12 | 2014-05-28 | 湖南大学 | Two-step micro-arc oxidation method for producing super wear-resistant coating on surface of aluminium alloy |
| US10871256B2 (en) | 2015-07-27 | 2020-12-22 | Schlumberger Technology Corporation | Property enhancement of surfaces by electrolytic micro arc oxidation |
| CN105239127A (en) * | 2015-11-13 | 2016-01-13 | 哈尔滨东安发动机（集团）有限公司 | Micro-arc oxidation method for cast aluminium alloy semi-closed inner cavity |
| CN110352267A (en) * | 2017-01-06 | 2019-10-18 | Mks仪器有限公司 | Protective oxide coatings with reduced metal concentration |
| WO2018128771A1 (en) * | 2017-01-06 | 2018-07-12 | Mks Instruments, Inc. | Protective oxide coating with reduced metal concentrations |
| CN107604411A (en) * | 2017-11-08 | 2018-01-19 | 江门市江海区杰德化工有限公司 | A kind of aluminum alloy differential arc oxidation processing method |
| CN107740166A (en) * | 2017-11-24 | 2018-02-27 | 南宁可煜能源科技有限公司 | A kind of differential arc oxidation method of solar panels aluminium frame |
| CN107974700A (en) * | 2017-12-08 | 2018-05-01 | 佛山市高明高盛铝业有限公司 | A kind of preparation process of high rigidity red oxidized aluminum alloy layer |
| CN111118571A (en) * | 2018-10-31 | 2020-05-08 | 华孚精密科技(马鞍山)有限公司 | Aluminum alloy micro-arc oxidation electrolyte, method and product thereof |
| CN111118570A (en) * | 2018-10-31 | 2020-05-08 | 华孚精密科技(马鞍山)有限公司 | Die-casting aluminum alloy micro-arc oxidation electrolyte, method and product thereof |
| CN109252200A (en) * | 2018-11-05 | 2019-01-22 | 佛山市南海镕信金属制品有限公司 | A kind of aluminum alloy die casting surface treatment method |
| CN109487270A (en) * | 2018-11-22 | 2019-03-19 | 江苏珀然股份有限公司 | A kind of wheel surface anti-oxidation processing method |
| CN112323114A (en) * | 2020-11-04 | 2021-02-05 | 西安赛福斯材料防护有限责任公司 | Preparation method of wear-resistant insulating film layer on surface of titanium alloy ball valve |
| CN112323114B (en) * | 2020-11-04 | 2022-08-23 | 西安赛福斯材料防护有限责任公司 | Preparation method of wear-resistant insulating film layer on surface of titanium alloy ball valve |
| CN113355715A (en) * | 2021-04-30 | 2021-09-07 | 上海交通大学 | Method for improving micro-arc oxidation film forming rate of zirconium alloy surface |
| CN114059128A (en) * | 2021-11-29 | 2022-02-18 | 广东广特电气股份有限公司 | Preparation method of ceramic membrane covered wire with high adhesion |
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