CN112824565B - Electrophoretic coating process of compressor - Google Patents
Electrophoretic coating process of compressor Download PDFInfo
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- CN112824565B CN112824565B CN201911153198.6A CN201911153198A CN112824565B CN 112824565 B CN112824565 B CN 112824565B CN 201911153198 A CN201911153198 A CN 201911153198A CN 112824565 B CN112824565 B CN 112824565B
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
- B23P11/02—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits
- B23P11/025—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits by using heat or cold
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Compressor (AREA)
Abstract
The invention discloses an electrophoretic coating process of a compressor, wherein the compressor comprises a shell, a motor and a pump body, and the electrophoretic coating process comprises the following steps: a pretreatment process; an electrophoretic coating process; and a drying process; the pretreatment process comprises the following steps: degreasing, namely removing oil stains on the surface of the shell by using degreasing fluid; rust prevention, wherein rust on the surface of the shell is avoided by using a rust inhibitor; the thermal sleeve is used for heating and assembling the shell and the motor; welding, namely welding and fixing the shell and the pump body; phosphorization, namely immersing a compressor into iron series phosphorization liquid to generate a phosphorization film on the surface of the shell; wherein the total acidity of the iron phosphating solution is 18 +/-3 pt, the acid consumption is 1.3-1.6pt, and the temperature is 50-55 ℃. The invention not only can meet the salt spray resistance of the compressor, but also can reduce the cost of the electrophoretic coating process of the compressor.
Description
Technical Field
The invention relates to the field of refrigeration equipment, in particular to an electrophoretic coating process of a compressor.
Background
The coating can be divided into dip coating, brush coating, spray coating, powder spraying, electrophoresis and the like according to the coating mode. The electrophoretic coating technique has the following characteristics: 1. even the object with a complex shape can be coated uniformly. 2. Can be automatically and continuously coated. 3. The coating has high utilization rate. 4. Because the coating is water-soluble, the coating is absolutely safe for accidents such as fire disasters and the like. 5. The UF ultrafiltration system is adopted, so that the pollution treatment cost of the washing wastewater is reduced, which is especially important at present.
The electrophoretic coating process of the compressor generally comprises the steps of pre-treatment phosphorization, coating, drying and the like. For pretreatment phosphating, the existing iron phosphating spraying process can only meet the salt spray resistance test performance of 100 hours and cannot meet the salt spray resistance test performance of 240 hours. In addition, a shell hot jacket process is adopted in the processing process of the compressor, and because the hot jacket can generate oxides on the surface of the shell, the temperature of the hot jacket is required to be controlled below 330 ℃ under the condition of adopting an iron-based phosphating spraying process, and the poor coating adhesion and salt spray resistance can be caused when the temperature is exceeded.
Disclosure of Invention
The invention aims to provide an electrophoretic coating process of a compressor to improve the salt spray resistance of the coating of the compressor aiming at the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the electrophoretic coating process of the compressor comprises a shell, a motor and a pump body, and comprises the following steps:
a pretreatment process;
an electrophoretic coating process; and
a drying process;
the pretreatment process comprises the following steps:
degreasing, namely removing oil stains on the surface of the shell by using degreasing fluid;
rust prevention, wherein rust on the surface of the shell is avoided by using a rust inhibitor;
the thermal sleeve is used for heating and assembling the shell and the motor;
welding, namely welding and fixing the shell and the pump body;
dipping and phosphorizing iron, namely dipping a compressor into iron phosphorizing liquid to generate a phosphorizing film on the surface of the shell; wherein, the total acidity of the iron phosphating solution is 18 +/-3 pt, the acid consumption is 1.3-1.6pt, and the temperature is 50-55 ℃.
In one embodiment of the present invention, the degreasing fluid contains FC-364S at a concentration of 15. + -.3 pt.
In one embodiment of the present invention, the degreasing time is 30 seconds or more.
In one embodiment of the present invention, the pretreatment step further includes: after degreasing and before phosphating, the shell is subjected to multi-stage water washing to remove the residual degreasing solution on the surface of the shell.
In one embodiment of the present invention, the phosphating agent in the iron-based phosphating solution is PF-L3469A.
In one embodiment of the present invention, the time for phosphating the compressor in the iron-based phosphating solution is 180 seconds or more.
In one embodiment of the present invention, the temperature of the thermal jacket is 330-.
In one embodiment of the present invention, the phosphating film comprises ferrous phosphate and two portions of crystal water.
The invention not only can meet the salt spray resistance of the compressor, but also can reduce the cost of the electrophoretic coating process of the compressor.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.
Fig. 1 is a flowchart of an electrocoating process of a compressor according to an embodiment of the invention. And
fig. 2 is a flowchart of a pretreatment process in the electrocoating process of the compressor shown in fig. 1.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
Fig. 1 is a flowchart of an electrocoating process of a compressor according to an embodiment of the invention. And FIG. 2 is a flow chart of a pretreatment process in the electrocoating process shown in FIG. 1. As shown in fig. 1, the present embodiment provides an electrophoretic coating process for a compressor, where the compressor includes a casing, a motor, and a pump body, and the electrophoretic coating process includes:
s100, a pretreatment process. The purpose of the pretreatment is to remove all foreign matters on the surface of the coated object, provide a good bottom layer suitable for the coating requirement and ensure the good corrosion resistance of the coating. The quality of the pretreatment is an important link directly influencing the service life of the coating. In this example, the pretreatment process, i.e., the pretreatment phosphating, is a process in which a compressor is immersed in a phosphate solution to form a water-insoluble phosphate film on the surface of the compressor. It is a process of forming a phosphate chemical conversion film by chemical and electrochemical reactions, and the formed phosphate conversion film is called a phosphating film. The purposes of phosphating mainly comprise: 1. provides protection for the base metal and prevents the metal from being corroded to a certain degree. 2. The primer is used for priming before painting, and the adhesive force and the corrosion resistance of a paint film layer are improved. 3. Plays a role in antifriction and lubrication in the metal cold working process. High performance organic coatings are applied to metal surfaces and if the coating adheres well to the metal surface, the coating is effective in protecting the metal, even in the most severe corrosive environments. For the purpose of effective adhesion to the metal surface, it is important to pretreat the metal surface prior to coating.
S200, an electrophoretic coating process, in this embodiment, the electrophoretic coating process of the compressor is as follows: the coating particles have a positive charge and the compressor is immersed in the cathodic electrophoretic paint, the compressor shell surface being the cathode. When a direct current is applied, the coating particles having a positive charge are attracted to the compressor, and the coating particles get a negative charge on the surface of the compressor and release an acid, thereby becoming insoluble, and a coating film is formed on the surface of the compressor by continuing this process. Optionally, the temperature of the cathode electrophoresis bath solution is 30 ℃, the voltage is 220V, and the electrophoresis coating time is 2 min.
And S300, drying. The cleaned compressor can be dried by adopting a natural gas combustion hot air circulation mode, the temperature of hot air can be controlled at 140-180 ℃, the drying time can be 120min, and then the workpiece is cooled at normal temperature.
As shown in fig. 2, step S100 may specifically include the following steps:
and S101, degreasing, and removing oil stains on the surface of the shell by using degreasing fluid. Cleaning the surface of the housing without oil stains is beneficial to forming a uniform phosphating film with complete appearance. Specifically, the degreasing fluid contains FC-364S with a concentration of 15 + -3 pt. The degreasing time is more than or equal to 30 seconds.
Optionally, the pretreatment process further includes: after degreasing and before phosphating, the shell is subjected to multi-stage water washing to remove the residual degreasing solution on the surface of the shell.
S102, rust prevention, wherein rust on the surface of the shell is avoided by using a rust inhibitor. The phosphating film cannot grow on a rust layer or an oxide scale, so avoiding rust is a necessary condition for phosphating.
S103, heating and sleeving the shell and the motor to be heated and assembled. The temperature of the thermal jacket may be 330-360 ℃. Because the hot jacket process can generate oxides on the surface of the shell, the hot jacket temperature is required to be controlled below 330 ℃ under the condition of adopting the iron-based phosphating spraying process, and the coating adhesion and the salt spray resistance are poor when the temperature is exceeded. On the premise that the electrophoretic coating process meets the requirement of a 240-hour salt spray test, the bearable hot jacket temperature of the electrophoretic coating process can be increased by 10-30 ℃ compared with the prior art.
And S104, welding and fixing the shell and the pump body.
S105, dipping and phosphorizing the iron system, and dipping the compressor into iron system phosphorizing liquid to enable the surface of the shell to generate a phosphorizing film. The phosphating film comprises ferrous phosphate and two parts of crystal water. In this example, the total acidity of the iron-based phosphating solution was 18. + -.3 pt, the acid consumption was 1.3 to 1.6pt and the temperature was 50 to 55 ℃. The phosphating agent in the iron-based phosphating solution can be PF-L3469A. Optionally, the time for phosphating the compressor in the iron-based phosphating solution is greater than or equal to 180 seconds. This application is put the bonderizing process of casing after heat cover process and welding process, can avoid the bonderizing membrane to receive the high temperature influence of heat cover process and welding process to this reduces the bonderizing membrane and produces harmful effects because of receiving high temperature dehydration to destroy to follow-up application quality.
The phosphate film can improve the adhesion of the coating for the following reasons: 1. by increasing the surface area of the substrate, the attachment mechanism is increased. 2. The coating is subjected to micropore adsorption on the phosphating film before polymerization, so that the phosphating film and a paint film can better mutually permeate. (3) Chemical reactions may occur between the unsaturated resin and the phosphoric acid crystals. Therefore, the quality of the phosphating film has direct relation with the adhesion and the corrosion resistance of the paint film layer, and the quality of the phosphating film can be judged by the technicians in the field through the quality of the paint film.
Compared with zinc-based phosphating, iron-based phosphating has the following advantages: 1. the iron-based coating is relatively smooth. 2. The blister phenomenon after coating is less, and because the iron-based coating is smoother, the remaining soluble salts are less, and the adverse effect on the subsequent coating process is less. 3. The zinc-based coating has relatively high heat resistance, and the performance of the zinc-based coating begins to deteriorate when the zinc-based coating is heated to about 200 ℃. On the contrary, the iron-based coating hardly causes any abnormality even at about 300 ℃. That is, iron-based phosphating is very suitable for surface treatment in a high-temperature dry type coating process. 4. The coating film has good adhesion, and when the weight of the phosphate film is measured, the zinc film is easily dissolved in an aqueous solution of anhydrous chromic acid, while the iron film is not dissolved. In addition, the zinc-based coating is relatively soluble in an aqueous solution of caustic soda and sodium cyanide, while the iron-based coating is not soluble. The reason is that the iron-based coating contains an oxide film in addition to a phosphate component, and therefore the iron-based coating also has higher chemical resistance than other phosphate coatings. 5, the consumption of the iron-based film phosphating agent is less than that of the zinc-based medicament, so that the production cost can be saved. 6. The slag generated by iron series phosphorization is less, the slag generated by iron series phosphorization is obviously less than that generated by zinc series phosphorization, and the cost in the aspects of deslagging, cleaning and the like is favorably reduced. 7. Because the treatment liquid for iron-based phosphating is close to a neutral state, the requirement of iron-based phosphating on the material of equipment is low. In general, the pH of a zinc-based coating phosphating tank is about 2, while the pH of an iron-based phosphating tank is generally 4 or more, so iron-based phosphating is relatively low in demand for the material of equipment.
Optionally, the pretreatment process further includes: after rust prevention and before phosphating, the surface of the shell is adjusted by the surface adjusting liquid. The phosphating surface conditioning agent can change the microscopic state of the metal surface to be phosphated, and promote the formation of a fine, uniform and compact phosphating film in the phosphating process. Wherein, the surface conditioning agent can be colloidal titanium salt.
TABLE 1.1
| Numbering | 9 | 10 | 11 | 12 |
| Temperature of the jacket | 330℃ | 330℃ | 360℃ | 360℃ |
| Degreasing time (seconds) | 60+120 | 60+120 | 60+120 | 60+120 |
| Phosphating time (seconds) | 180 | 180 | 180 | 180 |
| Total acidity pt | 28 | 28 | 28 | 28 |
| Temperature (. degree.C.) | 52 | 52 | 52 | 52 |
| Consumption of acid | 1.3 | 1.3 | 1.3 | 1.3 |
| Numbering | 13 | 14 | 15 | 16 |
| Temperature of the jacket | 330℃ | 330℃ | 360℃ | 360℃ |
| Degreasing time (seconds) | 60+120 | 60+120 | 60+120 | 60+120 |
| Phosphating time (seconds) | 180 | 180 | 180 | 180 |
| Total acidity pt | 28 | 28 | 28 | 28 |
| Temperature (. degree.C.) | 60 | 60 | 60 | 60 |
| Consumption of acid | 1.4 | 1.4 | 1.4 | 1.4 |
Table 1.1 above contains relevant test parameters for the iron-based dip phosphating process for compressor housings numbered 1-16.
1. Since the oxide layer generated in the shell hot jacket process has a certain influence on the iron-based phosphating process, the present embodiment sets 1 actual hot jacket upper limit temperature of 330 ℃ and 1 higher temperature condition of 360 ℃ for investigation.
2. The iron-based spraying method has the characteristics of short treatment time and high film-forming reaction speed, and in order to improve the film-forming reaction speed of the iron-based dipping and phosphating process, the experiment is carried out by setting the dipping and phosphating temperature by taking the set temperature of the iron-based spraying and phosphating as a reference.
3. In the present example, the total acidity of the immersion phosphating tank was set based on the reaction time of 180 seconds as the lower limit, and the test was conducted.
According to the test results, the phosphating process for the impregnated iron system can meet the phosphating requirements of the coating of the shell of the compressor.
Further, the quality of the phosphating film on the surface of the compressor shell is finally judged more comprehensively by combining the quality of the paint film after coating. In this embodiment, according to the test results of the iron system dipping phosphating process of the compressor housing, the test conditions of the iron system dipping phosphating and coating of the compressor complete machine are established. The total acidity of the phosphating tank is reduced, 15pt,18pt and 21pt are selected, 2 different process parameters of 50 ℃ and 60 ℃ are selected for cross test, and relevant parameters are shown in the following table 1.2.
TABLE 1.2
| Numbering | 1 | 2 | 3 | 4 |
| Temperature of the jacket | 330℃ | 330℃ | 330℃ | 330℃ |
| Degreasing time (seconds) | 60+120 | 60+120 | 60+120 | 60+120 |
| Phosphating time (seconds) | 180 | 180 | 180 | 180 |
| Total acidity pt | 15 | 15 | 18 | 18 |
| Temperature (. degree.C.) | 50 | 50 | 50 | 50 |
| Consumption of acid | 1.3-1.6 | 1.3-1.6 | 1.3-1.6 | 1.3-1.6 |
| Numbering | 5 | 6 | 7 | 8 |
| Temperature of the jacket | 330℃ | 330℃ | 330℃ | 330℃ |
| Degreasing time (seconds) | 60+120 | 60+120 | 60+120 | 60+120 |
| Phosphating time (seconds) | 180 | 180 | 180 | 180 |
| Total acidity pt | 15 | 15 | 18 | 18 |
| Temperature (. degree.C.) | 60 | 60 | 60 | 60 |
| Consumption of acid | 1.3-1.6 | 1.3-1.6 | 1.3-1.6 | 1.3-1.6 |
| Numbering | 9 | 10 | 11 | 12 |
| Temperature of the jacket | 330℃ | 330℃ | 330℃ | 330℃ |
| Degreasing time (seconds) | 60+120 | 60+120 | 60+120 | 60+120 |
| Phosphating time (seconds) | 180 | 180 | 180 | 180 |
| Total acidity pt | 21 | 21 | 21 | 21 |
| Temperature (. degree.C.) | 50 | 50 | 60 | 60 |
| Consumption of acid | 1.3-1.6 | 1.3-1.6 | 1.3-1.6 | 1.3-1.6 |
The experimental result shows that when the temperature of the hot jacket reaches 360 ℃, the residual oxide after the iron system of the shell of the compressor is dipped and phosphated is obviously less than that after the iron system is sprayed and phosphated, and the phosphating film on the surface of the coated shell meets the requirements of preset adhesive force and salt spray resistance of 100 hours or more. The above is only a part of experimental data of this embodiment, and in fact, when the temperature of the hot jacket is 340 ℃, 345 ℃, 350 ℃ and 355 ℃ and the temperature of the iron-based phosphating solution in the phosphating tank is 53 ℃, 55 ℃ and 58 ℃, the phosphating film formed on the surface of the compressor shell after iron-based dipping phosphating also meets the requirements of the predetermined adhesion and the salt spray resistance of 100 hours and above. Compared with the electrophoretic coating process taking iron-based spray phosphating as a pretreatment procedure, the electrophoretic coating process can increase the temperature of a hot jacket by 10-30 ℃ on the premise of meeting the requirement of a 240-hour salt spray test.
On the basis of the above experiment, the results of the 240-hour salt spray test of the compressor surface paint film of the electrophoretic coating process using iron-based dipping phosphorization as the pretreatment process and the electrophoretic coating process using iron-based spraying phosphorization as the pretreatment process are compared in this embodiment, and the relevant parameters are shown in table 1.3 below.
TABLE 1.3
From the experimental data in table 1.3 above, it can be seen that by using the electrophoretic coating process with the iron-based dipping phosphating process as the pretreatment process, the quality of the paint film formed after the compressor coating can meet the requirement of the 240-hour salt spray test (the single-side tearing width is less than or equal to 3.2mm), while the iron-based phosphating spraying process as the comparative example can not meet the requirement basically.
In summary, the invention not only can meet the quality requirements of phosphorization and coating of the compressor, but also can reduce the cost of the electrophoretic coating process of the compressor.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (7)
1. The utility model provides an electrophoresis coating technology of compressor, the compressor includes casing, motor and pump body, its characterized in that, electrophoresis coating technology includes:
a pretreatment process;
an electrophoretic coating process; and
a drying process;
the pretreatment process comprises the following steps:
degreasing, namely removing oil stains on the surface of the shell by using degreasing fluid;
rust prevention, wherein rust on the surface of the shell is avoided by using a rust inhibitor;
the heat jacket is used for heating and assembling the shell and the motor, and the temperature of the heat jacket is 330-360 ℃;
welding, namely welding and fixing the shell and the pump body;
dipping and phosphorizing iron, namely dipping a compressor into iron phosphorizing liquid to generate a phosphorizing film on the surface of the shell; wherein, the total acidity of the iron phosphating solution is 18 +/-3 pt, the acid consumption is 1.3-1.6pt, and the temperature is 50-55 ℃.
2. The electrodeposition coating process according to claim 1, wherein the degreasing fluid contains FC-364S at a concentration of 15 ± 3 pt.
3. The electrocoating process of claim 1 wherein the degreasing time is 30 seconds or more.
4. The electrocoating process of claim 1, wherein the pretreatment step further comprises: after degreasing and before phosphating, the shell is subjected to multistage water washing to remove residual degreasing fluid on the surface of the shell.
5. The electrocoating process of claim 1 wherein the phosphating agent in the iron-based phosphating solution is PF-L3469A.
6. The electrodeposition coating process according to claim 1, wherein the time for which the compressor is phosphated in the iron-based phosphating solution is 180 seconds or longer.
7. The electrocoating process of claim 1 wherein the phosphating film comprises ferrous phosphate and two portions of crystal water.
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