CN100570017C - The corrosion method for expanding face of lead anode foils in branch holes - Google Patents
The corrosion method for expanding face of lead anode foils in branch holes Download PDFInfo
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- CN100570017C CN100570017C CNB2006100961930A CN200610096193A CN100570017C CN 100570017 C CN100570017 C CN 100570017C CN B2006100961930 A CNB2006100961930 A CN B2006100961930A CN 200610096193 A CN200610096193 A CN 200610096193A CN 100570017 C CN100570017 C CN 100570017C
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Abstract
The invention discloses a kind of corrosion method for expanding face of lead anode foils in branch holes, comprise aluminium foil is placed at containing Cl
-1Mixed acid solution in apply the electrochemical etching electric current; Aluminium foil is soaked erosion handle in acid solution, apply ultrasonic wave simultaneously; Place the pH value at 2～9 the Cl that contains on aluminium foil
-1Corrode in the solution and handle, apply ultrasonic wave simultaneously, and aluminium foil is applied the electrochemical etching electric current; Aluminium foil is placed hydrochloric acid, oxalic acid mixing solutions, and apply direct current and carry out reaming and handle.The invention provides and to obtain the more erosion method of high capacitance and good uniformity, and do not increase the harmful element in the electrolytic solution, effectively improve the electrical capacity that corrodes aluminium foil and reduce the capacitance tolerance that corrodes the aluminium foil left, center, right.
Description
Technical field:
The present invention relates to a kind of corrosion method for expanding face of aluminium electrolutic capacitor aluminium foil.
Background technology
The electrode of aluminium electrolutic capacitor is an aluminium foil, because the electrical capacity of electrical condenser is directly proportional with the real surface of electrode for capacitors is long-pending, therefore the electrical capacity of unit surface electrode materials (aluminium foil) is big more, the electrode materials that the electrical condenser of rated capacity uses is just few more, the volume of electrical condenser is just more little, thereby can dwindle the volume of aluminium electrolutic capacitor, adapt to the miniaturization and the microminiaturization of current electronics.In order to increase the surface-area of aluminum electrode foil, usual method is to adopt the erosion technology to form a large amount of apertures in the aluminum foil thickness direction, and expansion is long-pending as the real surface of the aluminium foil of electrode for capacitors, is referred to as face-expanding erosion.
General face-expanding erosion technology is the acid electrolyte that aluminium foil is immersed contain chlorion and additive, applies the electrochemical etching of electric current or does not apply the chemical erosion of electric current.
Chinese patent CN85101034 discloses the method that a kind of high voltage aluminium anode foil electrochemistry expands face, and two steps of this method are all used the electric current etching, and technology and equipment complexity are only used hydrochloric acid and aluminum chloride in addition in the first step etchant, and electrical capacity is also little.
Chinese patent 94118454 discloses a kind of expansion face method of producing aluminium anode foil, it is to carry out dc electrolysis in hydrochloric acid, sulfuric acid, dichromate, the fluorion mixed solution that aluminium foil is placed on concentration, in aqueous hydrochloric acid, carry out the dc electrolysis corrosion again, in aqueous nitric acid, soak at last.
Chinese patent 99114961 discloses a kind of production mesohigh aluminium anode foil electrochemical method, is to apply combining of dc etching and chemical erosion method.
Most of pits that foregoing invention produces in the aluminum foil thickness direction all are single, parallel, shape such as tunnel-like, do not relate to the branch pore structure of pit.
Japanese patent laid-open 7-272983 discloses a kind of high voltage aluminium anode foil electrochemical method, two steps of this method all apply direct current, in the first step etchant, use hydrochloric acid in addition, second step corroded and carries out in acid chloride solution, the position in growth branch hole is only in the surface near aluminium foil, and electrical capacity is also little.
In order to prepare the erosion aluminium foil of heavy body, also have other many technology and methods.
Foregoing invention does not all relate to and has that the amphoteric aluminum ion produces precipitation in the hole, tunnel, the problem of the pit, influence and the reduction aluminium anode foil electrical capacity that stop up to corrode produce.
Summary of the invention
The object of the present invention is to provide a kind of corrosion method for expanding face that makes aluminium anode foil have the lead anode foils in branch holes of the big and little characteristic of capacitance tolerance of electrical capacity.
Technical solution of the present invention is:
A kind of corrosion method for expanding face of lead anode foils in branch holes is characterized in that: comprise the following steps: successively
1. aluminium foil is placed at and contains Cl
-1Mixed acid solution in apply the electrochemical etching electric current;
2. will in acid solution, soak through the aluminium foil that 1. step is handled to corrode and handle, apply ultrasonic wave simultaneously;
3. will place the pH value through the aluminium foil that 2. step is handled at 2～9 the Cl that contains
-1Corrode in the solution and handle, apply ultrasonic wave simultaneously, and aluminium foil is applied the electrochemical etching electric current;
4. will place hydrochloric acid, oxalic acid mixing solutions through the aluminium foil that 3. step is handled, and apply direct current and carry out reaming and handle.
Step contains Cl in 1.
-1Nitration mixture is with the HCl, the AlCl that adopt as the first sour composition
3, at least a H with as the second sour composition among NaCl or the KCl
2SO
4, H
3PO
4, HNO
3In at least a mixed solution.Contain Cl
-1The concentration of the first sour composition is 1～3mol/L in the nitration mixture, and the concentration of the second sour composition is 1.5～5mol/L.Step 1. the treatment time be 2～4 minutes, the mixed acid solution temperature is 50～90 ℃, electric current is a pulse direct current.The acid solution of step in 2. is HCl, H
3PO
4Or at least a solution in the HF solution.The acid solutions of step in 2. is 0.05～0.2mol/L.The ultrasonic intensity of step in 2. is 80～180W, and corroding the treatment time is 60～120 seconds, and the acid solution temperature is 40～80 ℃.The 3. middle ultrasonic intensity of step is 500～900W, contains Cl
-1The temperature of solution is 55～90 ℃, and corroding the treatment time is 4～7 minutes, and the erosion electric current is a galvanic current.Concentration of hydrochloric acid is that 7～9wt%, concentration of oxalic acid are 0.3～0.6wt% in the step mixing solutions 4..The 4. middle mixing solutions temperature of step is 60～80 ℃, and current density is 90～150mA/cm
2
Step 1. corrode with on aluminium foil, produce density big, have certain-length, afterbody is that tapered pit is a target.
2. step corrodes to increase pit medial surface active site is major objective.
Step 3. can be by adding a pair of mixture in additive borax/boric acid, oxalic acid/sodium oxalate, phosphoric acid/sodium hydrogen phosphate, the sodium carbonate/bicarbonate in pairs, and adjusting and control contain Cl
-1The etchant pH value of solution is between 2～9, and corroding with the galvanic current is the electrochemical etching electric current, thus control electrochemical etching product A l
+ 3Travelling speed, prevent Al
+ 3In this slightly acidic or neutral solution, produce precipitation, stop up the pit that the first step corrodes generation, and make the afterbody that the first step corrodes the generation pit that local passivation take place, change the direction that electrochemical etching carries out in pit, carry out along the pit medial surface, vertical direction at pit produces the branch hole, thereby it is long-pending effectively to improve aluminium foil surface.
Step 3. in, in electrolyte solution, apply ultrasonic wave erosion effect produced active influence.Hyperacoustic main effect is a hole bubble phenomenon of utilizing its generation, makes on the one hand electrochemical etching product A l
+ 3Migration change, prevent Al
+ 3In this slightly acidic or neutral solution, produce precipitation, stop up the pit that the first step corrodes generation, can reduce the oxidated layer thickness of aluminium foil surface and pit inboard on the other hand, the slightly acidic or the neutral effect deficiency (aluminium foil oxidated layer thickness reduction under the effect of H+ in the strongly acidic solution) of etchant have been remedied, the generation of electrochemical reaction has been quickened in the reduction of oxidated layer thickness, avoid positive charge to concentrate on around some shallow pit, produced the disadvantageous effect of macropore, reduction electrical capacity.
4. step corrodes main purpose is the aperture that enlarges pit, makes it to meet the requirement of different voltage capacitor anode foils.
The invention provides and to obtain the more erosion method of high capacitance and good uniformity, and do not increase the harmful element in the electrolytic solution, effectively improve the electrical capacity that corrodes aluminium foil and reduce the capacitance tolerance that corrodes the aluminium foil left, center, right.The present invention is long-pending by the real surface that further enlarges the electrolytic condenser aluminium anode foil, make aluminium anode foil obtain bigger surface-area and physical strength, can further dwindle the volume of electrolytic condenser, adapt to the miniaturization and the microminiaturization of complete electronic set instrument, further energy-conservation and reduce the consumption of high pure metal aluminium.
Description of drawings:
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the synoptic diagram of the pit that obtains after 1. step of the present invention is handled.
Fig. 2 is the synoptic diagram of the pit that obtains after 3. step of the present invention is handled.
Embodiment:
Embodiment 1:
A kind of corrosion method for expanding face of lead anode foils in branch holes comprises the following steps: successively
1. aluminium foil is placed at and contains Cl
-1Mixed acid solution in apply the electrochemical etching electric current; Contain Cl
-1Nitration mixture is with HCl that adopts 1.5mol/L and the H of 3mol/L
2SO
4Mixed solution, the treatment time is 3 minutes, the mixed acid solution temperature is 75 ℃, electric current is a pulse direct current.
2. will in the HCl of 0.1mol/L solution, soak through the aluminium foil that 1. step is handled to corrode and handle, apply ultrasonic wave simultaneously; Ultrasonic intensity is 100W, and corroding the treatment time is 120 seconds, and the HCl solution temperature is 40 ℃.
3. will place through the aluminium foil that 2. step is handled and be adjusted to the pH value with sodium oxalate/oxalic acid is 2 the Cl that contains
-1Corrode in the solution and handle, apply ultrasonic wave simultaneously, and aluminium foil is applied the electrochemical etching electric current; Ultrasonic intensity is 800W, contains Cl
-1The temperature of solution is 80 ℃, and corroding the treatment time is 6 minutes, and the erosion electric current is a galvanic current.
4. will place hydrochloric acid, oxalic acid mixing solutions through the aluminium foil that 3. step is handled, and apply direct current and carry out reaming and handle; Concentration of hydrochloric acid is that 8wt% (weight percent), concentration of oxalic acid are 0.5wt% in the mixing solutions, and the mixing solutions temperature is 65 ℃, and current density is 90mA/cm
2
Embodiment 2:
A kind of corrosion method for expanding face of lead anode foils in branch holes comprises the following steps: successively
1. aluminium foil is placed at and contains Cl
-1Mixed acid solution in apply the electrochemical etching electric current; Contain Cl
-1Nitration mixture is with HCl that adopts 1.2mol/L and the H of 2mol/L
2SO
4, 0.6mol/L HNO
3Mixed solution, the treatment time is 3 minutes, the mixed acid solution temperature is 60 ℃, electric current is a pulse direct current.
2. the aluminium foil that will 1. handle through step is at 0.1mol/L H
3PO
4Handle with soaking erosion in the 0.1mol/L HF mixing solutions, apply ultrasonic wave simultaneously; Ultrasonic intensity is 120W, and corroding the treatment time is 80 seconds, and the HCl solution temperature is 60 ℃.
3. will place through the aluminium foil that 2. step is handled and be adjusted to the pH value with borax/boric acid is 6 the Cl that contains
-1Corrode in the solution and handle, apply ultrasonic wave simultaneously, and aluminium foil is applied the electrochemical etching electric current; Ultrasonic intensity is 600W, contains Cl
-1The temperature of solution is 85 ℃, and corroding the treatment time is 6 minutes, and the erosion electric current is a galvanic current.
4. will place hydrochloric acid, oxalic acid mixing solutions through the aluminium foil that 3. step is handled, and apply direct current and carry out reaming and handle; Concentration of hydrochloric acid is that 8wt% (weight percent), concentration of oxalic acid are 0.5wt% in the mixing solutions, and the mixing solutions temperature is 70 ℃, and current density is 120mA/cm
2
Embodiment 3:
A kind of corrosion method for expanding face of lead anode foils in branch holes comprises the following steps: successively
1. aluminium foil is placed at and contains Cl
-1Mixed acid solution in apply the electrochemical etching electric current; Contain Cl
-1Nitration mixture is with KCl that adopts 2mol/L and the H of 4mol/L
3PO
4Mixed solution, the treatment time is 2.5 minutes, the mixed acid solution temperature is 85 ℃, electric current is a pulse direct current.
2. will in the HF of 0.15mol/L solution, soak through the aluminium foil that 1. step is handled to corrode and handle, apply ultrasonic wave simultaneously; Ultrasonic intensity is 150W, and corroding the treatment time is 60 seconds, and the HCl solution temperature is 80 ℃.
3. will place through the aluminium foil that 2. step is handled and be adjusted to the pH value with phosphoric acid/sodium hydrogen phosphate is 8 the Cl that contains
-1Corrode in the solution and handle, apply ultrasonic wave simultaneously, and aluminium foil is applied the electrochemical etching electric current; Ultrasonic intensity is 700W, contains Cl
-1The temperature of solution is 60 ℃, and corroding the treatment time is 5 minutes, and the erosion electric current is a galvanic current.
4. will place hydrochloric acid, oxalic acid mixing solutions through the aluminium foil that 3. step is handled, and apply direct current and carry out reaming and handle; Concentration of hydrochloric acid is that 8wt% (weight percent), concentration of oxalic acid are 0.5wt% in the mixing solutions, and the mixing solutions temperature is 75 ℃, and current density is 150mA/cm
2
Embodiment 4:
A kind of corrosion method for expanding face of lead anode foils in branch holes comprises the following steps: successively
1. aluminium foil is placed at and contains Cl
-1Mixed acid solution in apply the electrochemical etching electric current;
2. will in acid solution, soak through the aluminium foil that 1. step is handled to corrode and handle, apply ultrasonic wave simultaneously;
3. will place the Cl that contains of pH value through the aluminium foil that 2. step is handled in 2～9 (examples 2,5,9)
-1Corrode in the solution and handle, apply ultrasonic wave simultaneously, and aluminium foil is applied the electrochemical etching electric current;
4. will place hydrochloric acid, oxalic acid mixing solutions through the aluminium foil that 3. step is handled, and apply direct current and carry out reaming and handle.
Step contains Cl in 1.
-1Nitration mixture is with the HCl, the AlCl that adopt as the first sour composition
3, at least a H with as the second sour composition among NaCl or the KCl
2SO
4, H
3PO
4, HNO
3In at least a mixed solution.Contain Cl
-1The concentration of the first sour composition is 1～3mol/L (routine 1mol/L, 2mol/L, 3mol/L) in the nitration mixture, and the concentration of the second sour composition is 1.5～5mol/L (routine 1.5mol/L, 3mol/L, 5mol/L).Step 1. the treatment time be 2～4 minutes (example 2,3,4 minutes), the mixed acid solution temperature is 50～90 ℃ (50 ℃, 70 ℃, 90 ℃ of examples), electric current is a pulse direct current.The acid solution of step in 2. is HCl, H
3PO
4Or at least a solution in the HF solution.The acid solutions of step in 2. is 0.05～0.2mol/L (routine 0.05mol/L, 0.1mol/L, 0.2mol/L).The ultrasonic intensity of step in 2. is 80～180W (routine 80W, 130W, 180W), and corroding the treatment time is 60～120 seconds (example 60,90,120 seconds), and the acid solution temperature is 40～80 ℃ (40 ℃, 60 ℃, 80 ℃ of examples).The 3. middle ultrasonic intensity of step is 500～900W (routine 500W, 700W, 900W), contains Cl
-1The temperature of solution is 55～90 ℃ (55 ℃, 75 ℃, 90 ℃ of examples), and corroding the treatment time is 4～7 minutes (example 4,6,7 minutes), and the erosion electric current is a galvanic current.Concentration of hydrochloric acid is that 7～9wt% (example 7%, 8%, 9%), concentration of oxalic acid are 0.3～0.6wt% (example 0.3%, 0.5%, 0.6%) in the step mixing solutions 4..The 4. middle mixing solutions temperature of step is 60～80 ℃ (60 ℃, 70 ℃, 80 ℃ of examples), and current density is 90～150mA/cm
2(routine 90mA/cm
2, 130mA/cm
2, 150mA/cm
2).
4. comparative example 1:
The first step corrodes: etchant concentration: HCl:1.5mol/L; H
2SO
4: 3mol/L,
The etchant temperature: 85 ℃, erosion time: 3min corrodes current status: direct current.
Second step corroded: the H of 0.2mol/L
3PO
4Soaked 60 seconds in 60 ℃ in the solution.
The 3rd step corroded: etchant: NaCl 3.5% (wt);
The etchant temperature: 75 ℃, erosion time: 6min corrodes electric current: direct current.
The 4th step corroded at concentration of hydrochloric acid 8% (wt), concentration of oxalic acid 0.5% (wt), 65 ℃ of temperature, direct current current density 120mA/cm
2
5. two traditional step process of comparative example 2:()
The first step corrodes: etchant concentration: HCl:1.5mol/L; H
2SO
4: 3mol/L,
The etchant temperature: 85 ℃, erosion time: 4min corrodes current status: direct current.
Second step corroded at concentration of hydrochloric acid 8% (wt), concentration of oxalic acid 0.5% (wt), 65 ℃ of temperature, direct current current density 120mA/cm
2
After aforesaid method erosive aluminium foil cleaned up, under the 200V volts DS,, measure electrical capacity then, calculate and the velocity of variation of the aluminium foil electrical capacity of comparative example preparation and the capacitance deviation rate of aluminium foil left, center, right with organic acid anodic oxidation (changing into).The results are shown in Table 1.
Table 1
As seen from Table 1, the aluminium foil electrical capacity that has of prepared of the present invention is significantly increased, and the deviation of electrical capacity has obvious minimizing.
Claims (9)
1, a kind of corrosion method for expanding face of lead anode foils in branch holes is characterized in that: comprise the following steps: successively
1. aluminium foil is placed at and contains Cl
-Solution in apply the electrochemical etching electric current; The described Cl that contains
-Solution be with the HCl, the AlCl that adopt as first kind of composition
3, at least a H with as second kind of composition among NaCl or the KCl
2SO
4, H
3PO
4, HNO
3In at least a mixed solution;
2. will in acid solution, soak through the aluminium foil that 1. step is handled to corrode and handle, apply ultrasonic wave simultaneously;
3. will place the pH value through the aluminium foil that 2. step is handled at 2～9 the Cl that contains
-Corrode in the solution and handle, apply ultrasonic wave simultaneously, and aluminium foil is applied the electrochemical etching electric current;
4. will place hydrochloric acid, oxalic acid mixing solutions through the aluminium foil that 3. step is handled, and apply direct current and carry out reaming and handle.
2, the corrosion method for expanding face of lead anode foils in branch holes according to claim 1 is characterized in that: contain Cl
-The concentration of first kind of composition is 1～3mol/L in the solution, and the concentration of second kind of composition is 1.5～5mol/L.
3, the corrosion method for expanding face of lead anode foils in branch holes according to claim 1 and 2 is characterized in that: step 1. the treatment time be 2～4 minutes, contain Cl
-Solution temperature is 50～90 ℃, and electric current is a pulse direct current.
4, the corrosion method for expanding face of lead anode foils in branch holes according to claim 1 and 2 is characterized in that: the acid solution of step in 2. is HCl, H
3PO
4Or at least a solution in the HF solution.
5, the corrosion method for expanding face of lead anode foils in branch holes according to claim 4 is characterized in that: the acid solutions of step in 2. is 0.05～0.2mol/L.
6, the corrosion method for expanding face of lead anode foils in branch holes according to claim 1 and 2 is characterized in that: the ultrasonic intensity of step in 2. is 80～180W, and corroding the treatment time is 60～120 seconds, and the acid solution temperature is 40～80 ℃.
7, the corrosion method for expanding face of lead anode foils in branch holes according to claim 1 and 2 is characterized in that: the 3. middle ultrasonic intensity of step is 500～900W, contains Cl
-1The temperature of solution is 55～90 ℃, and corroding the treatment time is 4～7 minutes, and the erosion electric current is a galvanic current.
8, the corrosion method for expanding face of lead anode foils in branch holes according to claim 1 and 2 is characterized in that: concentration of hydrochloric acid is that 7～9wt%, concentration of oxalic acid are 0.3～0.6wt% in the step mixing solutions 4..
9, the corrosion method for expanding face of lead anode foils in branch holes according to claim 1 and 2 is characterized in that: the 4. middle mixing solutions temperature of step is 60～80 ℃, and current density is 90～150mA/cm
2
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| CN102042871A (en) * | 2010-10-22 | 2011-05-04 | 中国人民解放军海军潜艇学院 | Aluminum foil test method for performance of ultrasonic cleaner |
| CN103305889A (en) * | 2013-05-16 | 2013-09-18 | 陶荣燕 | Electrode foil formation liquid |
| CN105401209B (en) * | 2015-12-09 | 2018-03-30 | 广西贺州市桂东电子科技有限责任公司 | A kind of method of mesohigh anodic aluminum corrosion processing |
| CN106947998B (en) * | 2017-02-17 | 2018-09-11 | 乳源东阳光机械有限公司 | A kind of electrochemical reaction appts for producing etched foil |
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Non-Patent Citations (2)
| Title |
|---|
| 超声波对阳极氧化工艺及膜层性能的影响. 罗鹏，周海晖，张平等.电镀与涂饰，第25卷第5期. 2006 |
| 超声波对阳极氧化工艺及膜层性能的影响. 罗鹏，周海晖，张平等.电镀与涂饰，第25卷第5期. 2006 * |
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Assignee: Sichuan Zhongya Technology Co., Ltd. Assignor: Zhonglian Science and Technology Group Co., Ltd., Jiangsu Contract record no.: 2010510000061 Denomination of invention: Corrosion method for expanding face of lead anode foils in branch holes Granted publication date: 20091216 License type: Exclusive License Open date: 20070509 Record date: 20100817 |
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