CN112553680B - Method for stripping electrophoretic coating on surface of hanger - Google Patents
Method for stripping electrophoretic coating on surface of hanger Download PDFInfo
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- CN112553680B CN112553680B CN202011231142.0A CN202011231142A CN112553680B CN 112553680 B CN112553680 B CN 112553680B CN 202011231142 A CN202011231142 A CN 202011231142A CN 112553680 B CN112553680 B CN 112553680B
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
- C25F1/08—Refractory metals
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
Abstract
The invention discloses a method for stripping an electrophoretic coating on the surface of a hanger, which comprises the following steps: immersing a titanium hanger with an electrophoretic coating attached to the surface of the titanium hanger serving as a first electrode into an acid electrolyte; immersing an electrical conductor as a second electrode into the acidic electrolyte; after the titanium hanger and the electric conductor are chemically reacted in the acid electrolyte, taking out the titanium hanger and the electric conductor; wherein: and the titanium hanger is electrically connected with the electric conductor, and the standard electrode potential of the titanium hanger is higher than that of the electric conductor. The invention has the advantages of low energy consumption, no toxicity and harm and clean removal of the electrophoretic coating.
Description
Technical Field
The invention relates to the technical field of anodic oxidation production, in particular to a method for stripping an electrophoretic coating on the surface of a hanger.
Background
In the anodic oxidation production process of aluminum and aluminum alloy, stations such as electro-polishing, oxidation, electrolytic coloring, electrophoresis and the like need workpieces and electrolyte to form a conductive loop system, so that an oxidation hanger with good conductivity and mechanical property becomes an indispensable production tool. At present, the common oxidation hanging tool is made of aluminum and titanium, the aluminum hanging tool has good conductivity, but aluminum is easily corroded by acid and alkali, so that the aluminum is quickly consumed in the production process, the service life is short, and the maintenance cost is high. Titanium metal is an extremely active metal, the standard electrode potential of the titanium metal is-1.63V, a layer of inert, compact and good-conductivity oxide film is easily formed on the surface layer in the atmosphere and a neutral aqueous solution, and the stability of the titanium oxide film is obviously higher than that of aluminum oxide and even higher than that of selenium and stainless steel oxide films in most chemical reagents without halogen elements, so that the titanium hanger has the advantages of low consumption in the anodic oxidation process, long service life and low maintenance cost, and has more obvious economic benefits in anodic oxidation production compared with aluminum hangers. Meanwhile, the titanium hanger can be continuously used without an oxidation film, the elasticity is good, the elastic modulus can reach 103-110 Gpa, and the titanium hanger is not easy to loosen in the oxidation process, so that the titanium hanger is widely applied to anodic oxidation production.
When a workpiece is loaded by the titanium hanger for electrophoresis treatment, the surface of the hanger subjected to electrophoresis treatment is covered with a layer of polymer film, and the surface of the hanger subjected to electrophoresis treatment is cured to form a layer of insulating polymer cross-linked protective film which is well combined with the surface of the titanium base, so that the conductivity of the titanium hanger is remarkably reduced, and the titanium hanger needs to be removed before next production to ensure that the hanger has good conductivity. However, the electrophoretic coating is a cross-linked network structure, only partial degradation and swelling reaction occur under the influence of strong acid, organic solvent or stripping liquid, and the electrophoretic polymer coating and the interface of the titanium matrix have strong binding force, so that complete stripping is difficult to achieve in the stripping process, and the residual coating after stripping is adhered to the surface of the titanium hanger, so that on one hand, poor product conductivity is easily caused, and on the other hand, oxidation function bath solution is easily polluted, and the bath solution medicament is caused to lose efficacy.
Meanwhile, the method for stripping the electrophoretic coating has the defects of long time consumption, generation of toxic and harmful substances which harm human bodies and environments, high energy consumption and the like, and can not meet the requirements of industrial production.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for stripping an electrophoretic coating on the surface of a hanger, and aims to solve the technical problem that the electrophoretic coating on the surface of a titanium hanger in the prior art is difficult to remove, so that the conductive performance of the titanium hanger is influenced in production.
In order to solve the technical problem, the invention provides a method for stripping an electrophoretic coating on the surface of a hanger, which comprises the following steps: immersing a titanium hanger with an electrophoretic coating attached to the surface of the titanium hanger serving as a first electrode into an acid electrolyte; immersing an electrical conductor as a second electrode into the acidic electrolyte; after the titanium hanger and the electric conductor are chemically reacted in the acid electrolyte, taking out the titanium hanger and the electric conductor; wherein: and the titanium hanger is electrically connected with the electric conductor, and the standard electrode potential of the titanium hanger is higher than that of the electric conductor.
Preferably, before the titanium hanger with the electrophoretic coating attached to the surface is used as the first electrode and is immersed into the acid electrolyte, the method further comprises the following steps: and polishing to remove at least one part of the electrophoretic coating on the surface of the titanium hanger.
Preferably, the acid electrolyte is heated to 60-80 ℃.
Preferably, the chemical reaction time of the titanium hanger and the electric conductor in the acid electrolyte is 2-8 min.
Preferably, the electric conductor is an aluminum alloy decoration with an electrophoretic coating attached to the surface, and the step of immersing the electric conductor as a second electrode into the acidic electrolyte comprises the steps of: mounting defective products of the aluminum alloy decorating parts on a titanium hanger; the titanium hanger is immersed in an acid electrolyte.
Preferably, the acid electrolyte comprises sulfuric acid with the concentration of 410 g/L-467 g/L and phosphoric acid with the solubility of 620 g/L-664 g/L.
Preferably, a power supply is provided between the first electrode and the second electrode, and a voltage of 1V to 10V is applied to the first electrode and the second electrode by the power supply, wherein the first electrode is connected to a negative electrode of the power supply, and the second electrode is connected to a positive electrode of the power supply.
Preferably, after the titanium hanger and the conductor are taken out, the method further comprises the following steps: and (3) washing the aluminum alloy decorating part with water, alkali and acid.
Preferably, the alkali washing is to wash the mixture for 100 to 120 seconds by using a sodium hydroxide solution with the concentration of 40 to 60g/L at the temperature of 40 to 50 ℃; the acid washing is to wash 60-180S by adopting sulfuric acid with the concentration of 160-200 g/L.
Preferably, 1 to 3 weight percent of hydrogen peroxide is added into the acid solution used for acid washing.
By adopting the technical scheme, the invention can obtain the following technical effects:
in the method, a titanium hanger and a conductor of which the standard electrode potential is lower than that of the titanium hanger are put into electrolyte together for reaction, so that the titanium hanger and the conductor form a primary battery together, under the mechanism of the primary battery, as shown in figure 1, the conductor is used as a cathode of the primary battery, electrons are lost after oxidation reaction is generated in acid electrolyte, the titanium hanger is used as an anode of the primary battery, electrons are obtained in reduction reaction generated in the acid electrolyte, so that in the process of stripping the electrophoretic coating on the surface of the titanium hanger, the electrophoretic coating on the surface of the titanium hanger swells and degrades in the acid electrolyte, a large amount of hydrogen ions can enter a gap between the titanium substrate and the electrophoretic coating, the hydrogen ions obtain the electrons in the gap to generate a large amount of hydrogen, the electrophoretic coating is forced to be stripped from the titanium substrate, and after the electrophoretic coating swells and degrades, the electrophoretic coating is separated from the titanium substrate through the overflow effect of hydrogen, so that the method has the advantages of low energy consumption, no toxicity and harm, and the electrophoretic coating is removed completely, and meets the requirement of the titanium hanger on the electrical conductivity in the subsequent use process.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of another configuration of the present invention;
FIG. 3 is a process flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
The technical scheme is described in detail in the following with reference to the attached drawings of the specification:
referring to fig. 1, the present application provides a method for stripping an electrophoretic coating 4 on a surface of a titanium hanger 1, comprising the following steps: s20, immersing the titanium hanger 1 with the electrophoretic coating 4 attached to the surface as a first electrode into an acid electrolyte 3; s30, immersing the electric conductor 2 serving as a second electrode into the acidic electrolyte 3; s60, after the titanium hanger 1 and the electric conductor 2 are subjected to chemical reaction in the acid electrolyte 3, taking out the titanium hanger 1 and the electric conductor 2; wherein: the titanium hanger 1 and the conductor 2 are electrically connected, and the standard electrode potential of the titanium hanger 1 is higher than that of the conductor 2.
According to the method, a titanium hanger 1 and a conductor 2 with standard electrode potential lower than that of the titanium hanger 1 are put into electrolyte together for reaction, so that the titanium hanger 1 and the conductor 2 are formed into a primary battery together, under the mechanism of the primary battery, as shown in figure 1, the conductor 2 is used as a negative electrode of the primary battery, electrons are lost after oxidation reaction is generated in an acid electrolyte 3, the titanium hanger 1 is used as a positive electrode of the primary battery, electrons are obtained in a reduction reaction generated in the acid electrolyte 3, so that in the process of stripping an electrophoretic coating 4 on the surface of the titanium hanger 1, the electrophoretic coating 4 on the surface of the titanium hanger 1 is firstly swelled and degraded in the acid electrolyte 3, a large amount of hydrogen ions can enter a gap between the titanium base and the electrophoretic coating 4, the hydrogen ions are obtained in the gap by the electrons to generate a large amount of hydrogen 5, and the electrophoretic coating 4 is forced to be stripped from the titanium base, therefore, after the electrophoretic coating 4 is swelled and degraded, the electrophoretic coating 4 is separated from the titanium substrate through the overflow effect of the hydrogen 5, the method has the advantages of low energy consumption, no toxicity and no harm, the electrophoretic coating 4 is removed completely, and the requirement of the titanium hanger 1 on the electrical conductivity in the subsequent use process is met.
Referring to fig. 1, as a further optimization, before immersing the titanium hanger 1 with the electrophoretic coating 4 attached on the surface as a first electrode into the acidic electrolyte 3, the method further includes step S10: and (3) polishing to remove at least one part of the electrophoretic coating 4 on the surface of the titanium hanger 1.
Specifically, the titanium hanger 1 is partially polished to ensure that the titanium hanger 1 has conductivity before forming a galvanic cell with the conductor 2, so that the formation condition of the galvanic cell is met.
Referring to fig. 1, as a further optimization, the electrical conductor 2 is an aluminum alloy decoration with an electrophoretic coating 4 attached on the surface, and the step of immersing the electrical conductor 2 as a second electrode into the acidic electrolyte 3 includes the steps of: s31, mounting defective products of the aluminum alloy decorating parts on a titanium hanger 1; s32, immersing the titanium hanger 1 into an acid electrolyte 3.
Specifically, in the daily production process, there are some defective products, and these defective products need to be subjected to rework treatment, which necessarily involves a process of removing the electrocoat 4, and in the prior art, a film removal process is usually separately provided to remove the electrocoat 4 of the aluminum alloy garnish.
The standard electrode potential of aluminum alloy is-1.67V, can learn from the background art of this application, the standard electrode potential of titanium hanger 1 is-1.63V, so both can form the galvanic cell reaction, this application forms the galvanic cell through the defective product with titanium hanger 1 with the aluminum alloy decoration, realized both can detach electrophoretic coating 4 simultaneously in a process, through the amalgamation to the process, make this application for prior art, under the prerequisite that guarantees electrophoretic coating 4 and dispel the quality, have the saving process, high production efficiency, it is few to consume the energy, the advantage of the labour cost of saving.
Meanwhile, the conductive capacity of the aluminum anode oxide film is poor, the electrophoretic coating 4 on the surface of the aluminum alloy decorative strip is removed, special electrolytic equipment is usually adopted in the prior art, the anode oxide film and the electrophoretic coating 4 can be broken down by using higher voltage, a large amount of energy is consumed, the production temperature is high, the optimization of economic benefits is not facilitated, the electrochemical cell is formed, the surface of the aluminum alloy decorative strip can react with the acid electrolyte 3 and generate a large amount of hydrogen 5 to remove the electrophoretic coating 4, and the electrochemical cell has the advantage of good economic benefits.
It will be readily appreciated that in some embodiments of the present application, the conductive body 2 may also be an active metal or alloy capable of undergoing a redox reaction with an acid, such as magnesium, zinc, potassium, etc.
Referring to fig. 1, as a further optimization, the method further includes step S40: heating the acid electrolyte 3 to 60-80 ℃.
Specifically, the temperature is too low, will lead to electrophoretic coating 4 can't take place the swelling effect, the conductivity is low simultaneously, resistance is big, and then lead to reaction rate to reduce, the temperature is too high, the reaction is too violent, will lead to electric conductor 2 to be excessively corroded, and the reaction time window is narrow, be difficult to the management and control in production, simultaneously, the energy can further be wasted on the one hand to the high temperature, on the other hand leads to hydrogen 5 overflow volume too much, influence the production environment, this application is through with reaction temperature control at 60 ℃ -80 ℃, the technical problem who has taken place more than having solved, the advantage of reaction easy control has.
Referring to fig. 1, as a further optimization, the chemical reaction time of the titanium hanger 1 and the electric conductor 2 in the acid electrolyte 3 is 2-8 min.
Specifically, the reaction time is too short, and the electrophoretic coating 4 cannot be completely stripped; the electrolyte life is reduced after a long time, and excessive corrosion is easily caused when defective products are removed together.
As shown in FIG. 1, for further optimization, the acid electrolyte 3 includes sulfuric acid with a concentration of 410g/L to 467g/L and phosphoric acid with a solubility of 620g/L to 664 g/L.
Referring to fig. 2, as a further optimization, the method further includes step S50: and a power supply 6 is arranged between the first electrode and the second electrode, and the power supply 6 applies a voltage of 1-10V to the first electrode and the second electrode, wherein the first electrode is connected with the negative electrode of the power supply 6, and the second electrode is connected with the positive electrode of the power supply 6.
Specifically, by providing the power supply 6, an electrolytic circuit can be formed, so that the redox reaction of the battery formed by the titanium hanger 1 and the conductor 2 is promoted, and the peeling rate of the electrophoretic coating 4 is increased.
Referring to fig. 1 and 2, as a further optimization, the method further includes step S70 after the titanium hanger 1 and the electrical conductor 2 are taken out: the aluminum alloy garnish serving as the conductor 2 is washed with water, alkali, and acid.
The method is further optimized, and is characterized in that the alkali washing is to wash 100-120S by adopting a sodium hydroxide solution with the concentration of 40-60 g/L at the temperature of 40-50 ℃; the acid washing is to wash 60-180S by adopting sulfuric acid with the concentration of 160-200 g/L.
Specifically, make aluminum alloy decoration washing, alkali wash and pickling can detach the floating paint that adheres to the surface, the washing can set up to two washing, adopts overflow system, and the overflow volume is 300 and supplyes 500L/h to the realization is to the untimely renewal of pure water, removes aquatic impurity, avoids wasing back aluminum alloy decoration surface residual paint sediment. In the preferred embodiment of the application, the water washing can be a spraying system, the pressure is 0.15-0.3Mpa, the surface floating paint is removed by applying certain pressure water flow to the product, and meanwhile, impurities in a water washing tank are prevented from polluting subsequent tank liquor.
As a further optimization, the pickling process in step S70 further includes step S71: 1 to 3 weight percent of hydrogen peroxide is added into the acid solution used for acid cleaning.
Specifically, the removing capability of impurities on the surface of the aluminum alloy decorative strip can be improved by adding hydrogen peroxide.
The specific process flow of the present application is shown in fig. 3, and more preferably, step S30 further includes the sub-steps of: s31, mounting defective products of the aluminum alloy decorating parts on a titanium hanger; s32, immersing the titanium hanger 1 in an acid electrolyte 3.
The effect of various parameters involved in the present application on the removal quality of the electrocoat 4 will be described in detail below with reference to comparative examples and examples.
Comparative example 1:
the titanium hanger 1 after electrophoresis is independently hung on a flying target, and is soaked in an acid electrolyte 3 for 30min at the temperature of 90 ℃, the solution is continuously and circularly stirred, and the acid electrolyte 3 comprises the following components in concentration: sulfuric acid: 467g/L, phosphoric acid: 664 g/L. And then, sequentially carrying out air stirring on the titanium hanger 1 by using a sodium hydroxide alkaline etching solution and a sulfuric acid pickling solution, and drying for 6min at the temperature of 70 ℃ to remove the surface moisture of the titanium hanger 1. The concentration of the sodium hydroxide solution is 50.4g/L, the temperature is 45 ℃, and the soaking time is 60 s.
Example 1:
the method comprises the following steps of (1) mounting a titanium hanger 1 subjected to electrophoresis and an aluminum metal product on a target, taking the titanium hanger 1 as a primary battery anode and the aluminum metal product as a primary battery cathode, immersing the aluminum metal product into an acidic electrolyte 3 to form a conductive loop, and continuously and circularly stirring the solution, wherein the acidic electrolyte 3 comprises the following components: sulfuric acid: 467g/L, phosphoric acid: 664g/L, the temperature of the bath solution is 80 ℃, and the reaction time is 10 min. And then, sequentially carrying out air stirring on the titanium hanger 1 and the aluminum metal product through a sodium hydroxide alkali etching solution and a sulfuric acid pickling solution, drying for 6min at the temperature of 70 ℃, and removing the surface moisture of the hanger. The concentration of the sodium hydroxide solution is 50.4g/L, the temperature is 45 ℃, and the soaking time is 120 s; the sulfuric acid solution is 186.2g/L, and the soaking time is 60 s.
Example 2:
the method comprises the following steps of (1) mounting a titanium hanger 1 subjected to electrophoresis and an aluminum metal product on a target, taking the titanium hanger 1 as a primary battery anode and the aluminum metal product as a primary battery cathode, immersing the aluminum metal product into an acidic electrolyte 3 to form a conductive loop, and continuously and circularly stirring the solution, wherein the acidic electrolyte 3 comprises the following components: sulfuric acid: 467g/L, phosphoric acid: 664g/L, the temperature of the bath solution is 80 ℃, and the reaction time is 10 min. And then, sequentially carrying out air stirring on the titanium hanger 1 and the aluminum metal product through a sodium hydroxide alkali etching solution and a sulfuric acid pickling solution, drying for 6min at the temperature of 70 ℃, and removing the surface moisture of the hanger. The concentration of the sodium hydroxide solution is 50.4g/L, the temperature is 45 ℃, and the soaking time is 120 s; the sulfuric acid solution is 186.2g/L, and the soaking time is 60 s.
Example 3:
the method comprises the following steps of (1) mounting a titanium hanger 1 subjected to electrophoresis and an aluminum metal product on a target, taking the titanium hanger 1 as a primary battery anode and the aluminum metal product as a primary battery cathode, immersing the aluminum metal product into an acidic electrolyte 3 to form a conductive loop, and continuously and circularly stirring the solution, wherein the acidic electrolyte 3 comprises the following components: sulfuric acid: 467g/L, phosphoric acid: 664g/L, 75 ℃ of bath solution and 8min of reaction time. And then, sequentially carrying out air stirring on the titanium hanger 1 and the aluminum metal product through a sodium hydroxide alkali etching solution and a sulfuric acid pickling solution, drying for 6min at the temperature of 70 ℃, and removing the surface moisture of the hanger. The concentration of the sodium hydroxide solution is 50.4g/L, the temperature is 45 ℃, and the soaking time is 120 s; the sulfuric acid solution is 186.2g/L, and the soaking time is 60 s.
Example 4:
the method comprises the following steps of (1) mounting a titanium hanger 1 subjected to electrophoresis and an aluminum metal product on a target, taking the titanium hanger 1 as a primary battery anode and the aluminum metal product as a primary battery cathode, immersing the aluminum metal product into an acidic electrolyte 3 to form a conductive loop, and continuously and circularly stirring the solution, wherein the acidic electrolyte 3 comprises the following components: sulfuric acid: 467g/L, phosphoric acid: 664g/L, the temperature of the bath solution is 70 ℃, and the reaction time is 3.25 min. And then, sequentially carrying out air stirring on the titanium hanger 1 and the aluminum metal product through a sodium hydroxide alkali etching solution and a sulfuric acid pickling solution, drying for 6min at the temperature of 70 ℃, and removing the surface moisture of the hanger. The concentration of the sodium hydroxide solution is 50.4g/L, the temperature is 45 ℃, and the soaking time is 120 s; the sulfuric acid solution is 186.2g/L, and the soaking time is 60 s.
Example 5:
the method comprises the following steps of (1) mounting a titanium hanger 1 subjected to electrophoresis and an aluminum metal product on a target, taking the titanium hanger 1 as a primary battery anode and the aluminum metal product as a primary battery cathode, immersing the aluminum metal product into an acidic electrolyte 3 to form a conductive loop, and continuously and circularly stirring the solution, wherein the acidic electrolyte 3 comprises the following components: sulfuric acid: 410g/L, phosphoric acid: 620g/L, the temperature of the bath solution is 75 ℃, and the reaction time is 3.25 min. And then, sequentially carrying out air stirring on the titanium hanger 1 and the aluminum metal product through a sodium hydroxide alkali etching solution and a sulfuric acid pickling solution, and drying for 6min at the temperature of 70 ℃ to remove the surface moisture of the titanium hanger 1. The concentration of the sodium hydroxide solution is 43g/L, the temperature is 45 ℃, and the soaking time is 120 s; the sulfuric acid solution is 183.5g/L, and the soaking time is 60 s.
Example 6:
the method comprises the following steps of (1) commonly mounting an electrophoresed titanium hanger 1 and an electrophoresed aluminum alloy decoration strip defective product on a flying target, taking the titanium hanger 1 as a primary battery anode and an aluminum metal profile product as a primary battery cathode, immersing the primary battery anode and the aluminum metal profile product into an acidic electrolyte 3 to form a conductive loop, and continuously and circularly stirring a solution, wherein the acidic electrolyte 3 comprises the following components in concentration: sulfuric acid: 410g/L, phosphoric acid: 620g/L, the temperature of the bath solution is 75 ℃, and the reaction time is 3.25 min. And then, sequentially carrying out air stirring on the titanium hanger 1 and the aluminum metal product through a sodium hydroxide alkali etching solution and a sulfuric acid pickling solution, drying for 6min at the temperature of 70 ℃, and removing the surface moisture of the hanger. The concentration of the sodium hydroxide solution is 46.3g/L, the temperature is 45 ℃, and the soaking time is 120 s; the sulfuric acid solution is 186.5g/L, and the soaking time is 60 s.
Example 7:
the method comprises the following steps of (1) commonly mounting an electrophoresed titanium hanger 1 and an electrophoresed aluminum alloy decoration strip defective product on a flying target, taking the titanium hanger 1 as a primary battery anode and an aluminum metal plate product as a primary battery cathode, immersing the titanium hanger and the aluminum metal plate product into an acidic electrolyte 3 to form a conductive loop, and continuously and circularly stirring a solution, wherein the acidic electrolyte 3 comprises the following components in concentration: sulfuric acid: 410g/L, phosphoric acid: 620g/L, the temperature of the bath solution is 75 ℃, the reaction time is 3.25min, and then the titanium hanger 1 and the aluminum metal product are sequentially dried for 6min at 70 ℃ by sodium hydroxide alkali etching solution and sulfuric acid etching solution which are stirred by air, so as to remove the surface moisture of the hanger. The concentration of the sodium hydroxide solution is 46.3g/L, the temperature is 45 ℃, and the soaking time is 120 s; the sulfuric acid solution is 186.5g/L, and the soaking time is 60 s.
Example 8:
the method comprises the following steps of (1) commonly mounting an electrophoresed titanium hanger 1 and an electrophoresed aluminum alloy decoration strip defective product on a flying target, taking the titanium hanger 1 as a primary battery anode and an aluminum metal profile product as a primary battery cathode, immersing the primary battery anode and the aluminum metal profile product into an acidic electrolyte 3 to form a conductive loop, and continuously and circularly stirring a solution, wherein the acidic electrolyte 3 comprises the following components in concentration: sulfuric acid: 410g/L, phosphoric acid: 620g/L, the temperature of the bath solution is 75 ℃, and the reaction time is 2min10 s. And then, sequentially carrying out air stirring on the titanium hanger 1 and the aluminum metal product through a sodium hydroxide alkali etching solution and a sulfuric acid pickling solution, drying for 6min at the temperature of 70 ℃, and removing the surface moisture of the hanger. The concentration of the sodium hydroxide solution is 46.3g/L, the temperature is 45 ℃, and the soaking time is 120 s; the sulfuric acid solution is 186.5g/L, and the soaking time is 60 s.
Example 9
Connecting the electrophoresed defective products of the titanium metal and the aluminum alloy decoration strip by using an aluminum wire, connecting a 1.5V power supply 6 to an external circuit, and immersing the titanium metal serving as a cathode and the aluminum metal serving as an anode into an acidic electrolyte 3 to form a conductive loop for stripping. The acid electrolyte 3 comprises the following components in concentration: sulfuric acid: 410g/L, phosphoric acid: 620g/L, the temperature of the bath solution is 60 ℃, and the reaction time is 2 min. Subsequently, titanium metal and aluminum metal were washed clean with pure water.
The results of the examples are illustrated in Table 1 below:
TABLE 1
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for stripping electrophoretic coatings on the surfaces of hangers is characterized by comprising the following steps:
immersing a titanium hanger with an electrophoretic coating attached to the surface of the titanium hanger serving as a first electrode into an acid electrolyte;
immersing an electrical conductor as a second electrode into the acidic electrolyte;
after the titanium hanger and the electric conductor are chemically reacted in the acid electrolyte, taking out the titanium hanger and the electric conductor;
wherein:
and the titanium hanger is electrically connected with the electric conductor, and the standard electrode potential of the titanium hanger is higher than that of the electric conductor.
2. The method for stripping the electrophoretic coating on the surface of the hanger according to claim 1, wherein before the step of immersing the titanium hanger with the electrophoretic coating attached to the surface as the first electrode into the acidic electrolyte, the method further comprises the steps of: and polishing to remove at least one part of the electrophoretic coating on the surface of the titanium hanger.
3. The method for stripping electrophoretic coating on the surface of a hanger in accordance with claim 1, further comprising the steps of: heating the acidic electrolyte to 60-80 ℃.
4. The method for stripping the electrophoretic coating on the surface of the hanger according to claim 1, wherein the chemical reaction time of the titanium hanger and the electric conductor in the acid electrolyte is 2-8 min.
5. The method of claim 1, wherein the electrical conductor is an aluminum alloy decoration having an electrophoretic coating adhered to a surface thereof, and the step of immersing the electrical conductor as a second electrode in the acidic electrolyte comprises the steps of:
mounting defective products of the aluminum alloy decorating parts on a titanium hanger;
the titanium hanger is immersed in an acid electrolyte.
6. The method for stripping the electrophoretic coating on the surface of the hanger as claimed in claim 1, wherein the acidic electrolyte comprises sulfuric acid with a concentration of 410 g/L-467 g/L and phosphoric acid with a solubility of 620 g/L-664 g/L.
7. The method for stripping the electrophoretic coating on the surface of the hanger according to claim 5, wherein the method further comprises the following steps after the titanium hanger and the electric conductor are taken out: and (3) washing the aluminum alloy decorating part with water, alkali and acid.
8. The method for stripping the electrophoretic coating on the surface of the hanger according to claim 7, wherein the alkali washing is washing for 100S to 120S by using a sodium hydroxide solution with a concentration of 40g/L to 60g/L at a temperature of 40 ℃ to 50 ℃; the acid washing is to wash 60-180S by adopting sulfuric acid with the concentration of 160-200 g/L.
9. The method for stripping electrophoretic coating on the surface of a hanger in accordance with claim 7, further comprising the steps of: adding 1-3 wt% of hydrogen peroxide into the acid solution used for acid washing.
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