CN104034650A - Low voltage anode foil corrosion resistance test method and testing device for aluminium eletrolytic capacitor - Google Patents
Low voltage anode foil corrosion resistance test method and testing device for aluminium eletrolytic capacitor Download PDFInfo
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- CN104034650A CN104034650A CN201410233694.3A CN201410233694A CN104034650A CN 104034650 A CN104034650 A CN 104034650A CN 201410233694 A CN201410233694 A CN 201410233694A CN 104034650 A CN104034650 A CN 104034650A
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Abstract
The invention relates to an aluminium foil testing method and aluminium foil testing equipment, namely a low voltage anode foil corrosion resistance test method and a testing device for an aluminium eletrolytic capacitor. The method comprises putting an aluminium foil test piece into an acid liquid and is characterized in that electric current passes through the aluminium foil test piece in the acid liquid, then the aluminium foil test piece is taken out to measure weight loss index. Used devices comprise a beaker and a power supply. The test method has the beneficial effects that the aluminium foil is subjected to corrosion resistance test under electrifying condition, corrosion resistance of the superficial layer and a matrix of the aluminium foil are tested, and obtained data are more approximate to actual condition when the aluminium foil is processed; proved by a lot of actual tests, the testing method is feasible, has the characteristics of simple structure and convenience in operation, and is expected to be universal testing method and equipment in the industry.
Description
Technical field
The present invention relates to a kind of aluminium foil method of inspection and equipment, i.e. a kind of low-voltage anodic foil for aluminum electrolytic capacitor corrosion stability method of testing and proving installation.
Background technology
Aluminum electrolytic capacitor is a kind of electronic devices and components that are widely used in electric equipment products, and one of its critical material is low-voltage anode foil, also claims low-voltage foil, aluminium foil or light paper tinsel.Aluminium foil is sent out hole by surface corrosion and is obtained large specific surface area, then by changing into, makes the positive pole of corrosion Waste Acid From Hua Cheng Foil as aluminium electrolutic capacitor.The corrosion process of low-voltage anode foil is: first erode away a large amount of small pits at aluminium foil surface, then reaming produces hole in pit.Research shows, low-voltage foil corrosion process is very complicated, the result of its corrosion with the dislocation of aluminium foil surface, be mingled with, the many factors such as crystal boundary, component segregation, stress are concentrated, machinery scuffings is relevant, particularly with aluminium foil in the content of the snotter such as iron, silicon, copper closely related with distribution.For above-mentioned reasons, low-voltage foil product quality is difficult to control, even the aluminium foil products of same producer different batches, its decay resistance also may be not quite similar.Therefore, before using, aluminium foil must carry out corrosion-resistant test.
In industry, conventional corrosion-resistant detection method has two kinds at present: the one, and full corrosion simulation method: the i.e. multistage galvanic corrosion → pickling → aftertreatment of primary electrochemical corrosion → chemical corrosion → secondary, washing, oven dry, do Mechanics Performance Testing, judge the corrosion stability of light paper tinsel by the quality of mechanical property.This methods experiment process complexity, flow process is oversize, and each link control requires accurately, to be difficult to be applied to a large amount of conventional sense.The 2nd, acid corrosion method: light paper tinsel is directly put in the hydrochloric acid of 5mol/L and soaked 10 minutes, rinse, dry, calculate the weight difference before soaking and after soaking.Because aluminium foil is easily corroded, in actual production, be only concerned about its decay resistance, generally think that aluminium foil attenuate under this condition is that corrosion stability is good below 0.3%.This method is easy and simple to handle and obtain general application, but accuracy is very poor.With the aluminium foil of the method test passes, in actual production, show bad phenomenon and frequently occur, often cause responsibility dispute.
Think, what when low-voltage anode foil is produced, use is mainly galvanic corrosion, and it is 50% left and right that final products obtain paper tinsel rate, in corrosion process, can lose the weight of about half, existing acid corrosion test is simple chemical corrosion, and the loss in weight is only 0.3% left and right, and both differ greatly.The part that aluminium foil loses in test is skin-material, only can reflect the shallow expression condition of aluminium foil, can not reflect the situation of aluminium foil deep layer, thereby production run is lacked to directive significance.
Summary of the invention
The object of this invention is to provide a kind of can test the decay resistance of aluminium foil, and simple and easy to do, and test result more approaches method of testing and the testing apparatus of the corrosion-resistant actual conditions of aluminium foil.
Above-mentioned purpose is realized by following technical scheme: develop a kind of low-voltage anodic foil for aluminum electrolytic capacitor corrosion stability method of testing, comprise aluminium foil test piece is put into acid solution, be characterized in: electric current is passed through in the aluminium foil test piece in described acid solution, then take out aluminium foil test piece and measure loss in weight index, infer the corrosion resistance of the product of aluminium foil test piece representative according to this index.
Described aluminium foil test piece access DC circuit, the current density of passing through is 38-42A/dm
2.
Described acid solution is that mass ratio is 15%～20% HCl or 10%～15% H
2sO
4.
Described aluminium foil test piece access DC circuit, current density: 38-42A/dm
2, acid solution is the HCl of mass ratio 15%～20% or 10%～15% H
2sO
4, 65 ± 5 DEG C of temperature, time 2.5-3.5min.
Described aluminium foil test piece access DC circuit, current density: 40A/dm
2, acid solution is the HCl of mass ratio 15%～20% or 10%～15% H
2sO
4, 65 DEG C of temperature, the time is 3min.
A kind of low-voltage anodic foil for aluminum electrolytic capacitor corrosion stability proving installation, is characterized in: described device has the beaker of splendid attire acid solution, and beaker is furnished with power supply in the middle of the two poles of the earth of power supply, having at least a utmost point to be provided with the contact joining with aluminium foil test piece.
Described power supply is direct supply.
Below described beaker, is furnished with magnetic stirring apparatus.
Described beaker is 3000ml glass cylinder, the beaker cover plate of being furnished with insulation suitable for reading, on cover plate, have three electrode jacks and two thermowells, in the middle of three electrode jacks, middle one is matched with the clamping plate of clamping aluminium foil test piece, two of both sides are matched with carbon element plate, and aluminium foil test piece connects positive source, and two carbon element plates connect power cathode.
Described two thermowells match with the control temperature meter of thermometer and magnetic stirring apparatus respectively.
The invention has the beneficial effects as follows: aluminium foil carries out corrosion-resistant test under power on condition, the shallow top layer of aluminium foil and the corrosion resisting property of matrix are all detected, the data obtained more approaches the actual conditions that aluminium foil adds man-hour, prove that through a large amount of actual measurements this detection method is practical, and have simple in structure, the feature such as easy to operate, is expected to become detection method and the equipment that the industry is general.
Brief description of the drawings
Fig. 1 is the front view of the first embodiment;
Fig. 2 is the vertical view of the first embodiment;
Fig. 3 is the circuit diagram of the first embodiment;
Fig. 4 is the front view of the second embodiment;
Fig. 5 is the front view of the third embodiment.
Visible in figure: beaker 1, electrode 2, cover plate 3, power supply 4, contact 5, aluminium foil test piece 6, magnetic stirring apparatus 7, magneton 8, thermometer 9, acidproof control temperature meter 10, carbon element plate 11, clamping plate 12, U-shaped copper sheet 13.
Embodiment
The total design of the present invention is to make aluminium foil carry out corrosion-resistant test under the condition of energising.Introduce three kinds of embodiment below in conjunction with accompanying drawing:
The first embodiment: the new method of the corrosion-resistant test of aluminium foil that this example provides, is that aluminium foil test piece 6 is placed in acid solution, then carries out corrosion-resistant test by electric current.Fig. 1 Fig. 2 Fig. 3 has introduced the corrosion-resistant proving installation of a kind of aluminium foil, has a beaker 1, and filling quality is than 15%～20% hydrochloric acid (HCl) or 10%～15% sulfuric acid (H in beaker
2sO
4).Beaker is furnished with insulation cover plate 3, is furnished with direct supply 4 on cover plate 3.The wire that the positive and negative electrode 2 at power supply 4 two ends picks out enters beaker 1, and the outer end of wire is provided with contact 5, and contact 5 can be a kind of clamp, and aluminium foil test piece 6 is clipped in a clamp, turns on the power switch, and aluminium foil test piece 6 is switched on, current density 38-42A/dm
2, 65 ± 5 DEG C of temperature, time 2.5-3.5min, taking 3min as preferred.Test index is calculated by weight-loss method, has for standard test piece: Δ m=m1-m2, the wherein weight before m1=test, the weight after m2=test, the weight that Δ m=loses.Weigh with m1-m2/m1 for nonstandard test piece.
In order to verify the accuracy of this method of testing, since 2013, carry out the repeatedly contrast experiment of new and old method of testing, under same acids liquid same time, the spillage of material amount of this method is the more than 30 times of aging method, can simulate the actual production process of low-voltage anodic foil for aluminum electrolytic capacitor, the decay resistance of accurate response aluminium foil.In addition, also cooperate with manufacturer, the accuracy of this method of testing has been carried out to Statistical Comparison, analysis result proves, adopt the test result of this method and the coincidence rate of actual production to improve more than 20% than former method, reach 92.5%, completely can for the production of and the process of circulation.
The second embodiment: as shown in Figure 4, the corrosion-resistant proving installation of this aluminium foil and the first embodiment are basic identical, also have beaker 1 and the direct supply 4 of splendid attire acid solution, aluminium foil test piece 6 detects in the time of energising, and its improvement is: below beaker 1, be provided with magnetic stirring apparatus 7, after switching on power, the magnetic field of rotation drives the magneton 8 in beaker 1 to rotate, and stirs acid solution, makes the composition of acid solution and temperature more even, and have impact, test result is more accurate.Test result improves more than 23% than former method with the coincidence rate of actual production, reaches 95.5%, can for the production of and the process of circulation.
The third embodiment: Fig. 5 has introduced a kind of corrosion-resistant proving installation of aluminium foil test piece 6, and its main body is a 3000ml glass beaker 1, is furnished with magnetic stirring apparatus 7, one sides below and is furnished with a direct supply.The circular cover 3 that beaker 1 has a PVC to make above, has three slots arranged side by side and two through holes on cover plate 3.In the middle of three slots, middle slot matches with the PVC clamping plate 12 of clamping aluminium foil test piece 6, and the slot on both sides matches with two blocks of T shape carbon element plates 11.Aluminium foil test piece 6 is joined with the positive pole of power supply, and two carbon element plate 11 upper ends are connected by a U-shaped copper sheet 13, and U-shaped copper sheet 13 joins with the negative pole of power supply.The common alcohol thermometer 9 of plug-in mounting of two through holes, the acidproof control temperature meter 10 of another plug-in mounting magnetic stirring apparatus.Also be provided with the control assemblies such as heating, constant temperature, timing simultaneously.Filling quality is than 15%～20% hydrochloric acid (HCl) or 10%～15% sulfuric acid (H in beaker
2sO
4).
When work, first the light paper tinsel of test use is made to width is identical with the narrow limit of PVC clamping plate 12, length is compared with the test piece 6 of the long 1cm of PVC plate, carries out ungrease treatment, dries, weighs with alcohol, recording weight is m1.Aluminium foil test piece 6 is clipped in the middle of two PVC clamping plate 12.The both positive and negative polarity of direct supply connects respectively a wire, and wire end connects a clip, and the clip of negative pole end clips on U-shaped copper sheet 13, and the clip of positive terminal is in the upper end of filtering test piece 6 of exposing clamping plate 12.Press timer switch, current density 38-42A/dm
2, 65 ± 5 DEG C of temperature, time 2.5-3.5min, taking 3min as preferred, the about 10min of whole operating process.When finishing, timing closes direct supply.Take off the clip of positive terminal, the aluminium foil test piece 6 being clipped in the middle of PVC plate is taken out, rinse, dry, weigh, recording weight is m2.Quantitatively detect corrosion stability computing formula: absolute weightless Δ m=m1-m2.Both sides of supply and demand can be decided through consultation a standard value with regard to Δ m, and the Δ m that experiment records is qualified lower than this standard value, and height is defective, does corresponding measure.Test result improves more than 26.7% than former method with the coincidence rate of actual production, reaches 99.2%, completely can for the production of and the process of circulation.
Claims (10)
1. a low-voltage anodic foil for aluminum electrolytic capacitor corrosion stability method of testing, comprise aluminium foil test piece is put into acid solution, it is characterized in that: electric current is passed through in the aluminium foil test piece in described acid solution, then take out aluminium foil test piece and measure loss in weight index, infer the decay resistance of the product of aluminium foil test piece representative according to this index.
2. low-voltage anodic foil for aluminum electrolytic capacitor corrosion stability method of testing according to claim 1, is characterized in that: described aluminium foil test piece access DC circuit, the current density of passing through is 38-42A/dm
2.
3. low-voltage anodic foil for aluminum electrolytic capacitor corrosion stability method of testing according to claim 1, is characterized in that: described acid solution is that mass ratio is 15%～20% HCl or 10%～15% H
2sO
4.
4. low-voltage anodic foil for aluminum electrolytic capacitor corrosion stability method of testing according to claim 1, is characterized in that: described aluminium foil test piece access DC circuit, current density: 38-42A/dm
2, acid solution is that mass ratio is 15%～20% HCl or 10%～15% H
2sO
4, 65 ± 5 DEG C of temperature, time 2.5-3.5min.
5. low-voltage anodic foil for aluminum electrolytic capacitor corrosion stability method of testing according to claim 1, is characterized in that: described aluminium foil test piece access DC circuit, current density: 40A/dm
2, acid solution is that mass ratio is 15%～20% HCl or 10%～15% H
2sO
4, 65 DEG C of temperature, the time is 3min.
6. a low-voltage anodic foil for aluminum electrolytic capacitor corrosion stability proving installation, it is characterized in that: the proving installation that described method is used has the beaker (1) of splendid attire acid solution, beaker (1) is furnished with power supply (4), the contact (5) that has at least a utmost point to be provided with in the middle of the two poles of the earth of power supply (4) to join with aluminium foil test piece (6).
7. low-voltage anodic foil for aluminum electrolytic capacitor corrosion stability proving installation according to claim 6, is characterized in that: described power supply (4) is direct supply.
8. low-voltage anodic foil for aluminum electrolytic capacitor corrosion stability proving installation according to claim 6, is characterized in that: below described beaker (1), be furnished with magnetic stirring apparatus (7).
9. low-voltage anodic foil for aluminum electrolytic capacitor corrosion stability proving installation according to claim 6, it is characterized in that: described beaker (1) is 3000ml glass cylinder, beaker (1) cover plate (3) of being furnished with insulation suitable for reading, on cover plate (3), have three electrode (2) jacks and two thermometers (9) jack, in the middle of three electrodes (2) jack, middle one is matched with the clamping plate (12) of clamping aluminium foil test piece (6), two of both sides match with carbon element plate (11) or the U-shaped copper sheet (13) that is connected two carbon element plates (11), aluminium foil test piece (6) connects power supply (4) positive pole, the U-shaped copper sheet (13) of two carbon element plates (11) or two carbon element plates of connection (11) connects power supply (4) negative pole.
10. low-voltage anodic foil for aluminum electrolytic capacitor corrosion stability proving installation according to claim 9, is characterized in that: described two thermometers (9) jack matches with the acidproof control temperature meter (10) of thermometer (9) and magnetic stirring apparatus (7) respectively.
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| CN201410233694.3A CN104034650A (en) | 2014-05-29 | 2014-05-29 | Low voltage anode foil corrosion resistance test method and testing device for aluminium eletrolytic capacitor |
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| CN201410233694.3A CN104034650A (en) | 2014-05-29 | 2014-05-29 | Low voltage anode foil corrosion resistance test method and testing device for aluminium eletrolytic capacitor |
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| CN110361319A (en) * | 2019-06-05 | 2019-10-22 | 邵阳学院 | The unleaded anti-corrosion system safety testing device of electrolytic capacitor low-voltage anode foil |
| CN111351826A (en) * | 2018-12-21 | 2020-06-30 | 惠州昌钲新材料有限公司 | Method for rapidly detecting quality of electrode foil for capacitor |
| CN112316995A (en) * | 2020-11-30 | 2021-02-05 | 江苏科技大学 | Multifunctional electrochemical three-mouth beaker |
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Application publication date: 20140910 |