CA1200527A - Method of controlling the thickness of an electrodeposited coating - Google Patents
Method of controlling the thickness of an electrodeposited coatingInfo
- Publication number
- CA1200527A CA1200527A CA000425363A CA425363A CA1200527A CA 1200527 A CA1200527 A CA 1200527A CA 000425363 A CA000425363 A CA 000425363A CA 425363 A CA425363 A CA 425363A CA 1200527 A CA1200527 A CA 1200527A
- Authority
- CA
- Canada
- Prior art keywords
- electrodeposition
- thickness
- resistivity
- coating
- electrodeposited
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/22—Servicing or operating apparatus or multistep processes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/42—Measuring deposition or liberation of materials from an electrolyte; Coulometry, i.e. measuring coulomb-equivalent of material in an electrolyte
Landscapes
- Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- Immunology (AREA)
- General Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The usual method of controlling the thickness of an electrodeposited coating is to prevent the pH, the resistivity, and the temperature of the electrodeposition paint from varying by the use of regulating devices. In the method of thickness control according to the present invention, these three factors are not regulated but are per-mitted to vary freely over an allowable range. The electro-deposited charge necessary to produce a desired weight of coating is computed for the present bath conditions, and this electrodeposited charge is then obtained by regulating the electrodeposition current. This method of thickness control obviates the expensive pH, resistivity, and tempera-ture control devices required in the usual method, and is thus very economical.
The usual method of controlling the thickness of an electrodeposited coating is to prevent the pH, the resistivity, and the temperature of the electrodeposition paint from varying by the use of regulating devices. In the method of thickness control according to the present invention, these three factors are not regulated but are per-mitted to vary freely over an allowable range. The electro-deposited charge necessary to produce a desired weight of coating is computed for the present bath conditions, and this electrodeposited charge is then obtained by regulating the electrodeposition current. This method of thickness control obviates the expensive pH, resistivity, and tempera-ture control devices required in the usual method, and is thus very economical.
Description
~0052~7 METHOD OF CONTROLLING THE THICKNESS OF AN
ELECTRODEPOSITED COATING
Back~round of the Invention The present invention relates to a method of con-trolling the thickness of an electrodeposited coating pro-duced by electrophoresis whereby a desired coating thickness can be easily achieved.
The thickness of an electrodeposited coating pro-duced by electrophoresis is dependent on the electro-deposition voltage, the length of time for which this voltage is applied, and the characteristics (the p~, the resistivity, and the temperature~ of the electrodeposition paint in which the object to be coated by electrodepostion is immersed. In mass production, it is important that every object to be coated have the same coating thickness. The usual method of attaining a uniform coating is to regulate all of the .:bv-ie~Lactors so that they do not vary from object to object.
This method has the advantage that the electro-deposition operation can always be carried out at maximum efficiency by setting the pH, the resistivity, and the temperature at optimal values. However, it has the over-riding disadvantage that it requires great capital invest-ment; a pH regulator is necessary to regulate the pH, a dialysis apparatus is necessary to regulate the resistivity, and a temperature regulator is necessary to regulate the temperature of the electrodeposition paint.
-1- `~
~ ~3'{~5;~
There is -therefore need of a different method of thickness control which does not make use of such regulat;ng devices.
It is an object of the present invention to provide a method of controlling the thickness of an electrodeposi-ted coating which does not require strict control over the temperature, the pll, or the resistivity o-f the electrodeposition pa.in-t being used.
According to the present invention there is provided a method of con-trolling the thickness of an electrodeposited coating comprising: previously determining the relationship between electrodeposited charge, electrodeposition paint resistivity, electrodeposition paint pH, coating thickness and surface area of the object to be coated; measuring the presen-t pH and the resistivity of the electrodeposition paint at the time of electrodeposition; calculating the electro-deposited charge required to produce a given thickness and surface area of coating given said present resistivity and pH using said previously determined relationship; and regulating the electrodeposition current level of the electrodeposition apparatus being used and the length of time for which said current- flows so as to achieve said calculated electrodeposited charge.
In the present method, the pH, the resistivity, and the temperature of the electrodeposition paint are per mitted to vary freely within allowable limits, and the desired thickness of electrodeposited coating is obtained by regulating the electrodeposited charge.
s~
The invention will now he described in more detail, by way of example only, with reference to the accompanying drawings, in which:-Figure 1 is a graph showing the relationship betweenthe weight per square cm of an electrodeposited coating and the resistivity of the electrodeposition paint used to produce this coating with pH and temperature held constant.
Figure 2 is a graph of the relationship between coating weight per square cm and pH of the electrodeposition paint with resistivity and temperature held constant.
Figure 3 is a graph showing the relationship between coating weight per square cm and temperature of the electrodeposition paint with resistivity and pH held constant.
Figure 4 is a graph showing the relationship between electrodeposition efficiency (weight per square cm per coulomb) and temperature, with resistivity, pH, and coating thickness held constant.
~4 ~5~t7 Figure 5 is a graph showing the relationship between electrodeposited charge and surface area of the object to be coated for 4 different coating thic~nesses with the resistivity and pH of the electrodeposition paint held constant, Figure 6 is a schematic diagram of an electro-deposition apparatus employing the coating thickness control method according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIME~T
The electrodeposited charge necessary to produce a given thickness of coating using a given electrodeposition paint is dependent on the pH and the resistivity of the paint but is independent of the temperature. This is shown in Figures 1 through 4. The first 3 figures are the results of e~perimental electrodeposition carried out on identical samples at a constant voltage for a set length of time, at the end of which time the weight of coating per square cm was measured.
The data Eor Figure 1 was obtained by varying the resistivity of the electrodeposition paint while maintaining the pH and temperature constant. For Fiaure 2, the p~ was varied and the resistivity and temperature were held constant. For Figure 3, the temperature of the electro-deposition paint was varied while the resisitivity and the pH were held constant.
Figure 4 shows electrodeposition efficiency (the weiyht of coating in mg per square cm divided by the electro-~0~2,'7 deposited charge required to produce this weight) plotted asa function of temperature with resistivity, pH, and coating thickness held constant. Whereas in the first three qraphs the electrodeposition voltage and time were held constant, for Figure 4, they were varied so as to achieve the same coating thickness for each electrodeposition.
Since the coating thickness and the weight per square cm were held constant, the horizontal slope of the curve clearly shows that the electrodeposited charge in coulombs necessary to produce a given thickness of coating is unaffected by temperature.
The present method takes advantage of that fact and does not involve measuring the temperature. It involves measuring only the pH and the resistivity of the electrodeposition paint being used, determining the electrodeposited charge required to produce a desired thickness of coating given that pH and resistivity, and regulati.ng the electrodeposition current of the electrodeposition apparatus being used so that the required electrodeposited charge is produced.
The preferred method for controlling the thickness of an electrodeposited coating according to the present invention is as follows. First, it is necessary to deter-mine by experiment the relationship between electrodeposited charge, resistivity, pH, coating thickness, and surface area of the object to be coated. This is accomplished by carry-ing out electrodeposition numerous times on samples of various surface area under various values of resistivity and pH, measuring the electrodeposited charge required to pro-~ ~t~5~
duce a given coating thickness. Sample results are plotted in Figure 5 with surface area as the abscissa and electro--deposited charge in coulombs as the ordinate. Each curve in the figure shows the relationship between charge and surface area for one of 4 coating thicknesses (t) with pH and resisitivity held constant for all the curves. A great many graphs similar to Figure 5 are prepared using other values of resisitivity and pH, which result in different curves.
Enough graphs are prepared so that it is possible to deter-mine the electrodeposited charge in coulombs necessary to produce a desired coating thickness and surface area for any given resistivity and pH, either by direct reference to the appropriate graph for that resistivity and pH or by interpo-lation.
After completing the above preliminary procedure of determining the relationship between electrodeposited charge, resisitivity, pH, coating thickness, and surface area, actual e]ectrodeposition is carried out.
~ nlike electrodeposition according to the conven-tional method, the pH, the resistivity, and the temperature of the electrodeposition paint do not need to be strictly regulated but can vary freely within certain limits. The pH
and the resisitivity of the electrodeoosition p~int are measured, and the electrodeposited charge necessary to pro-duce a desired coating thickness given the present resistivity and pH is calculated using the previously deter-mined relationship. Since the desired coating thickness and surface area of the object to be coated are known, the P5~i~
electrodeposited charge can be easily read or interpolated from a graph like the one shown in Figure 5.
Electrodeposition is then carried out until the electrodeposited charge equals the charge calculated in the previous step. Since charge = current x time, the desired electrodeposited charge can be produced by regulating the level of the electrodeposition current, the length of time for which this current flows, or both.
Many of the steps in the method described above can be performed automatically by a computer, which ma~es the thic~ness control method according to the present invention particularly suitable for an automated electro-deposition system.
Figure 2 shows a schematic of an apparatus for automatically controlling the thickness of an electrode?osited coating using the method according to the present invention. 2 is the object to be coated by electrodeposition. The electrodeposition paint 3 comprises ~ater-dispersed varnish and mica powder. ~ is a pH sensor for measuring the pH of the paint 3 and 5 is a resistivity sensor for measuring the paint's resistivity. 6 is a shunt used to measure the electrodeposition current flowing throuah the ob~ect 2. The sensors 4,5 and the shunt 6 are electrically connected to a microcomputer 7 having an input portion 8, a calculation portion 9, and an output portion 10. 11 is a DC po~er supply controlled by a voltage regulator 12 which is electrically connected to and controlled by the output portion 10. 13 is a switch electrically connected to and controlled by the output portion 10. By closing and opening the switch 13, the electrodeposition process is commenced or terminated.
The use and operation of the app~ratus shown in Figure 2 are as follows. First the relationship between electrodeposited charge, resistivity, pH, coating thickness, and surface area is determined by experiment, as described earlier. This relationship is then programmed into the microcomputer 7. In addition, the desired thickness of coating and the surface area of the object to be coated are input to the microcomputer 7.
Electrodeposition is then carried out. The pH
sensor 4 and the resistivity sensor 5 measure the pH and the resistivity, respectively, of the electrodeposition paint and input corresponding voltages to the input portion 8 of the microcomputer 7. sased on the input from the sensor 4 and S, the calculation portion 9 of the microcomputer 7 calculates the electrodeposited charge required to produce the desired thic~ness of coating using the previously deter-mined relationship between electrodeposited charge, resistivity, pH, coating thickness, and surface area.
Electrical signals from the output portion 10 of the micro-computer 7 close the switch 13 to commence electro-deposition, and other signals from the output portion 10 con-trol the voltage regulator 12 and thus the voltage produced by the DC power supply 11 so that an appropriate electro-deposition current flows through the shunt 6 and the object
ELECTRODEPOSITED COATING
Back~round of the Invention The present invention relates to a method of con-trolling the thickness of an electrodeposited coating pro-duced by electrophoresis whereby a desired coating thickness can be easily achieved.
The thickness of an electrodeposited coating pro-duced by electrophoresis is dependent on the electro-deposition voltage, the length of time for which this voltage is applied, and the characteristics (the p~, the resistivity, and the temperature~ of the electrodeposition paint in which the object to be coated by electrodepostion is immersed. In mass production, it is important that every object to be coated have the same coating thickness. The usual method of attaining a uniform coating is to regulate all of the .:bv-ie~Lactors so that they do not vary from object to object.
This method has the advantage that the electro-deposition operation can always be carried out at maximum efficiency by setting the pH, the resistivity, and the temperature at optimal values. However, it has the over-riding disadvantage that it requires great capital invest-ment; a pH regulator is necessary to regulate the pH, a dialysis apparatus is necessary to regulate the resistivity, and a temperature regulator is necessary to regulate the temperature of the electrodeposition paint.
-1- `~
~ ~3'{~5;~
There is -therefore need of a different method of thickness control which does not make use of such regulat;ng devices.
It is an object of the present invention to provide a method of controlling the thickness of an electrodeposi-ted coating which does not require strict control over the temperature, the pll, or the resistivity o-f the electrodeposition pa.in-t being used.
According to the present invention there is provided a method of con-trolling the thickness of an electrodeposited coating comprising: previously determining the relationship between electrodeposited charge, electrodeposition paint resistivity, electrodeposition paint pH, coating thickness and surface area of the object to be coated; measuring the presen-t pH and the resistivity of the electrodeposition paint at the time of electrodeposition; calculating the electro-deposited charge required to produce a given thickness and surface area of coating given said present resistivity and pH using said previously determined relationship; and regulating the electrodeposition current level of the electrodeposition apparatus being used and the length of time for which said current- flows so as to achieve said calculated electrodeposited charge.
In the present method, the pH, the resistivity, and the temperature of the electrodeposition paint are per mitted to vary freely within allowable limits, and the desired thickness of electrodeposited coating is obtained by regulating the electrodeposited charge.
s~
The invention will now he described in more detail, by way of example only, with reference to the accompanying drawings, in which:-Figure 1 is a graph showing the relationship betweenthe weight per square cm of an electrodeposited coating and the resistivity of the electrodeposition paint used to produce this coating with pH and temperature held constant.
Figure 2 is a graph of the relationship between coating weight per square cm and pH of the electrodeposition paint with resistivity and temperature held constant.
Figure 3 is a graph showing the relationship between coating weight per square cm and temperature of the electrodeposition paint with resistivity and pH held constant.
Figure 4 is a graph showing the relationship between electrodeposition efficiency (weight per square cm per coulomb) and temperature, with resistivity, pH, and coating thickness held constant.
~4 ~5~t7 Figure 5 is a graph showing the relationship between electrodeposited charge and surface area of the object to be coated for 4 different coating thic~nesses with the resistivity and pH of the electrodeposition paint held constant, Figure 6 is a schematic diagram of an electro-deposition apparatus employing the coating thickness control method according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIME~T
The electrodeposited charge necessary to produce a given thickness of coating using a given electrodeposition paint is dependent on the pH and the resistivity of the paint but is independent of the temperature. This is shown in Figures 1 through 4. The first 3 figures are the results of e~perimental electrodeposition carried out on identical samples at a constant voltage for a set length of time, at the end of which time the weight of coating per square cm was measured.
The data Eor Figure 1 was obtained by varying the resistivity of the electrodeposition paint while maintaining the pH and temperature constant. For Fiaure 2, the p~ was varied and the resistivity and temperature were held constant. For Figure 3, the temperature of the electro-deposition paint was varied while the resisitivity and the pH were held constant.
Figure 4 shows electrodeposition efficiency (the weiyht of coating in mg per square cm divided by the electro-~0~2,'7 deposited charge required to produce this weight) plotted asa function of temperature with resistivity, pH, and coating thickness held constant. Whereas in the first three qraphs the electrodeposition voltage and time were held constant, for Figure 4, they were varied so as to achieve the same coating thickness for each electrodeposition.
Since the coating thickness and the weight per square cm were held constant, the horizontal slope of the curve clearly shows that the electrodeposited charge in coulombs necessary to produce a given thickness of coating is unaffected by temperature.
The present method takes advantage of that fact and does not involve measuring the temperature. It involves measuring only the pH and the resistivity of the electrodeposition paint being used, determining the electrodeposited charge required to produce a desired thickness of coating given that pH and resistivity, and regulati.ng the electrodeposition current of the electrodeposition apparatus being used so that the required electrodeposited charge is produced.
The preferred method for controlling the thickness of an electrodeposited coating according to the present invention is as follows. First, it is necessary to deter-mine by experiment the relationship between electrodeposited charge, resistivity, pH, coating thickness, and surface area of the object to be coated. This is accomplished by carry-ing out electrodeposition numerous times on samples of various surface area under various values of resistivity and pH, measuring the electrodeposited charge required to pro-~ ~t~5~
duce a given coating thickness. Sample results are plotted in Figure 5 with surface area as the abscissa and electro--deposited charge in coulombs as the ordinate. Each curve in the figure shows the relationship between charge and surface area for one of 4 coating thicknesses (t) with pH and resisitivity held constant for all the curves. A great many graphs similar to Figure 5 are prepared using other values of resisitivity and pH, which result in different curves.
Enough graphs are prepared so that it is possible to deter-mine the electrodeposited charge in coulombs necessary to produce a desired coating thickness and surface area for any given resistivity and pH, either by direct reference to the appropriate graph for that resistivity and pH or by interpo-lation.
After completing the above preliminary procedure of determining the relationship between electrodeposited charge, resisitivity, pH, coating thickness, and surface area, actual e]ectrodeposition is carried out.
~ nlike electrodeposition according to the conven-tional method, the pH, the resistivity, and the temperature of the electrodeposition paint do not need to be strictly regulated but can vary freely within certain limits. The pH
and the resisitivity of the electrodeoosition p~int are measured, and the electrodeposited charge necessary to pro-duce a desired coating thickness given the present resistivity and pH is calculated using the previously deter-mined relationship. Since the desired coating thickness and surface area of the object to be coated are known, the P5~i~
electrodeposited charge can be easily read or interpolated from a graph like the one shown in Figure 5.
Electrodeposition is then carried out until the electrodeposited charge equals the charge calculated in the previous step. Since charge = current x time, the desired electrodeposited charge can be produced by regulating the level of the electrodeposition current, the length of time for which this current flows, or both.
Many of the steps in the method described above can be performed automatically by a computer, which ma~es the thic~ness control method according to the present invention particularly suitable for an automated electro-deposition system.
Figure 2 shows a schematic of an apparatus for automatically controlling the thickness of an electrode?osited coating using the method according to the present invention. 2 is the object to be coated by electrodeposition. The electrodeposition paint 3 comprises ~ater-dispersed varnish and mica powder. ~ is a pH sensor for measuring the pH of the paint 3 and 5 is a resistivity sensor for measuring the paint's resistivity. 6 is a shunt used to measure the electrodeposition current flowing throuah the ob~ect 2. The sensors 4,5 and the shunt 6 are electrically connected to a microcomputer 7 having an input portion 8, a calculation portion 9, and an output portion 10. 11 is a DC po~er supply controlled by a voltage regulator 12 which is electrically connected to and controlled by the output portion 10. 13 is a switch electrically connected to and controlled by the output portion 10. By closing and opening the switch 13, the electrodeposition process is commenced or terminated.
The use and operation of the app~ratus shown in Figure 2 are as follows. First the relationship between electrodeposited charge, resistivity, pH, coating thickness, and surface area is determined by experiment, as described earlier. This relationship is then programmed into the microcomputer 7. In addition, the desired thickness of coating and the surface area of the object to be coated are input to the microcomputer 7.
Electrodeposition is then carried out. The pH
sensor 4 and the resistivity sensor 5 measure the pH and the resistivity, respectively, of the electrodeposition paint and input corresponding voltages to the input portion 8 of the microcomputer 7. sased on the input from the sensor 4 and S, the calculation portion 9 of the microcomputer 7 calculates the electrodeposited charge required to produce the desired thic~ness of coating using the previously deter-mined relationship between electrodeposited charge, resistivity, pH, coating thickness, and surface area.
Electrical signals from the output portion 10 of the micro-computer 7 close the switch 13 to commence electro-deposition, and other signals from the output portion 10 con-trol the voltage regulator 12 and thus the voltage produced by the DC power supply 11 so that an appropriate electro-deposition current flows through the shunt 6 and the object
2. When the microcomputer 7 determines that the product of the electrodeposition current flowing through the shunt 6 and the length of time for which the current has flowed equals the calculated electrodeposited charge, an electrical signal from the output portion 10 causes the switch 13 to , open, and the electrodeposition process is completed.
It should be clear that an electrodeposition coat-ing apparatus employing the control method according to the present invention is much cheaper than an apparatus employ-ing the conventional control method, since the present method does not require pH, resistivity, or temperature regulators. Moreover, a control apparatus employing the present invention is more versatile in that the size of the control apparatus is not dependent on the size of the electrodeposition bath with which it is used. In contrast, the size of a control apparatus using the conventional control method is very dependent on the size of the electro-deposition bath, since a large electrodeposition bath requires much larger pH, resistivity, and temperature regula-tors than does a small bath.
The present method was described for use with the automa~c corltrol apparatus pictured in Figure 2, but it is not restricted to use with that particular apparatus and may be effectively used with any other appropriate control apparatus.
Further, although the present method was described for use wlth an electrodeoosition paint comprising water-disoersed varnish and mica powder, thi~s method may be used with any other electrodeposition paint for which the electrodeposition efficiency is independent of temperature.
_g_
It should be clear that an electrodeposition coat-ing apparatus employing the control method according to the present invention is much cheaper than an apparatus employ-ing the conventional control method, since the present method does not require pH, resistivity, or temperature regulators. Moreover, a control apparatus employing the present invention is more versatile in that the size of the control apparatus is not dependent on the size of the electrodeposition bath with which it is used. In contrast, the size of a control apparatus using the conventional control method is very dependent on the size of the electro-deposition bath, since a large electrodeposition bath requires much larger pH, resistivity, and temperature regula-tors than does a small bath.
The present method was described for use with the automa~c corltrol apparatus pictured in Figure 2, but it is not restricted to use with that particular apparatus and may be effectively used with any other appropriate control apparatus.
Further, although the present method was described for use wlth an electrodeoosition paint comprising water-disoersed varnish and mica powder, thi~s method may be used with any other electrodeposition paint for which the electrodeposition efficiency is independent of temperature.
_g_
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of controlling the thickness of an electro-deposited coating comprising: previously determining the relation-ship between electrodeposited charge, electrodeposition paint resistivity, electrodeposition paint pH, coating thickness, and surface area of the object to be coated; measuring the present pH and the resistivity of the electrodeposition paint at the time of electrodeposition, calculating the electrodeposited charge required to produce a given thickness and surface area of coating given said present resistivity and pH using said previously determined relationship; and regulating the electrodeposition current level of the electrodeposition apparatus being used and the length of time for which said current flows so as to achieve said calculated electrodeposited charge.
2. A method of controlling the thickness of an electro-deposited coating as claimed in claim 1, wherein said electro-deposition paint comprises water-dispersed varnish.
3. A method according to the thickness of an electro-deposited coating as claimed in claim 2, wherein said electro-deposition paint further comprises mica powder.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58673/1982 | 1982-04-06 | ||
| JP57058673A JPS58174597A (en) | 1982-04-06 | 1982-04-06 | Method for controlling thickness of electrodeposition film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1200527A true CA1200527A (en) | 1986-02-11 |
Family
ID=13091096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000425363A Expired CA1200527A (en) | 1982-04-06 | 1983-04-06 | Method of controlling the thickness of an electrodeposited coating |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS58174597A (en) |
| KR (1) | KR890001710B1 (en) |
| AU (1) | AU540359B2 (en) |
| CA (1) | CA1200527A (en) |
| ES (1) | ES8404067A1 (en) |
| FR (1) | FR2524496B1 (en) |
| MX (1) | MX159993A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63310996A (en) * | 1987-06-10 | 1988-12-19 | Honda Motor Co Ltd | Coating method by electrodeposition |
| JPH059793A (en) * | 1991-07-04 | 1993-01-19 | Nissan Motor Co Ltd | Method and device for electrodeposition coating |
| JPH059794A (en) * | 1991-07-04 | 1993-01-19 | Nissan Motor Co Ltd | Method and device for electrodeposition coating |
| JP4384825B2 (en) | 2001-04-26 | 2009-12-16 | 上村工業株式会社 | Method for calculating film thickness of electrodeposition coating |
| DE102009010399A1 (en) | 2009-02-26 | 2010-09-02 | Aucos Elektronische Geräte GmbH | Hall sensor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1536975A (en) * | 1966-07-18 | 1968-08-23 | Sherwin Williams Co | Method and apparatus for controlling and adjusting the characteristics of fluid mixtures |
-
1982
- 1982-04-06 JP JP57058673A patent/JPS58174597A/en active Granted
-
1983
- 1983-03-17 KR KR1019830001071A patent/KR890001710B1/en not_active IP Right Cessation
- 1983-04-05 MX MX196838A patent/MX159993A/en unknown
- 1983-04-05 ES ES521248A patent/ES8404067A1/en not_active Expired
- 1983-04-05 FR FR8305536A patent/FR2524496B1/en not_active Expired
- 1983-04-06 AU AU13175/83A patent/AU540359B2/en not_active Ceased
- 1983-04-06 CA CA000425363A patent/CA1200527A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES521248A0 (en) | 1984-04-01 |
| AU1317583A (en) | 1983-10-13 |
| JPS58174597A (en) | 1983-10-13 |
| FR2524496B1 (en) | 1986-06-06 |
| MX159993A (en) | 1989-10-23 |
| FR2524496A1 (en) | 1983-10-07 |
| KR890001710B1 (en) | 1989-05-18 |
| ES8404067A1 (en) | 1984-04-01 |
| JPS6234840B2 (en) | 1987-07-29 |
| KR840004187A (en) | 1984-10-10 |
| AU540359B2 (en) | 1984-11-15 |
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