JP4652081B2 - How to paint the fuel inlet - Google Patents

Description

The present invention relates to a fuel inlet coating method for improving the rust prevention performance of a fuel inlet mainly composed of a fuel inlet pipe (fuel refueling pipe) for injecting fuel such as gasoline into a fuel tank of a vehicle such as an automobile. It is about .

Conventionally, in a fuel inlet of a vehicle such as an automobile, a steel pipe in which a fuel inlet pipe (hereinafter also simply referred to as “inlet pipe”) constituting a fuel inlet and a breather tube are galvanized is used as a rust prevention measure. In addition, in recent years, there has been a demand for further improvement in durability including rust prevention performance for fuel system parts. Therefore, the invention disclosed in Patent Document 1 discloses a technique in which stainless steel is used as a material for the inlet pipe and the breather tube and cationic electrodeposition coating is performed after the breather tube is welded to the inlet pipe. By adopting such a manufacturing method, in a combined rust prevention evaluation test in which salt spray, heat drying, wet, and room temperature are repeated, steel materials that have been subjected to cationic electrodeposition coating and stainless steel materials are used, but the coating is applied It is said that it showed excellent rust prevention performance with no drilling or occurrence of red rust, etc.
Japanese Patent Laid-Open No. 2002-242779

  However, the fuel inlet manufacturing method according to Patent Document 1 does not consider that the fuel inlet is chipped by a stepping stone or the like while the vehicle is running. Cationic electrodeposition coating easily peels off when subjected to chipping, exposing the stainless steel surface. Therefore, the manufacturing method according to Patent Document 1 has a problem that sufficient fuel inlet rust prevention performance cannot be obtained.

Then, this invention makes it a subject to provide the coating method of the fuel inlet which can ensure sufficient rust prevention performance, even if it receives chipping.

The fuel inlet coating method according to the invention of claim 1 is a method of coating a fuel inlet made of a stainless steel material so that the rust prevention performance does not deteriorate even when chipping is applied. Pre-coating a high-viscosity chipping-resistant paint of 8 Pa · s to 50 Pa · s, and applying the chipping-resistant paint to the whole outer surface of the fuel inlet or a portion that receives chipping of the outer surface before the pre-painted portion is dried. By coating, the portion of the fuel inlet that is difficult to paint and the entire outer surface, or the portion of the fuel inlet that is difficult to paint and the portion that receives chipping of the outer surface are coated with the chipping resistant paint with a substantially uniform film thickness. To do .

The fuel inlet coating method according to the first aspect of the present invention is a method of coating a fuel inlet made of a stainless steel material so that rust prevention does not deteriorate even when chipping is applied. By pre-coating a high-viscosity chipping-resistant paint of s to 50 Pa · s, and applying the chipping-resistant paint to the entire outer surface of the fuel inlet or the part that receives the chipping of the outer surface before the pre-coated part is dried , The part that is difficult to paint the fuel inlet and the entire outer surface, or the part that is difficult to paint the fuel inlet and the part that receives chipping of the outer surface are coated with a chipping resistant paint with a substantially uniform film thickness .

Here, as the “part where it is difficult to paint the fuel inlet”, there are a part where the inlet pipe and the breather tube intersect, a part where the breather tube is attached, and the like. Further, as the “ chipping resistant coating ”, vinyl chloride sol type chipping resistant coating, acrylic sol type chipping resistant coating, aqueous emulsion type chipping resistant coating, and the like can be used. Further, as a pre-coating method, there are brush coating, flow coating performed by attaching a flow nozzle to the tip of an airless gun used for airless atomization coating described later.

Thereafter, the high viscosity of 8Pa · s~50Pa · s in a portion receiving the chipping of the outer surface overall or outer surface of the fuel inlet while the portion where chipping paint is before application of the high viscosity of 8Pa · s~50Pa · s is not dried Apply a brush or airless atomizing paint to the chipping-resistant paint . Here, “airless atomization coating” means “air atomization coating” represented by an air spray gun, that is, a method of atomizing (spraying) liquid paint using the force of compressed air and spraying it. in a manner opposed to a method causes atomization mechanically paint, the paint was pressurized to 5MPa~20MPa in plunger-type pump is sprayed by atomization through a dedicated nozzle tip, intended to spray paint is there.

Both brush painting and airless atomization painting can uniformly apply high-viscosity paint that cannot be applied with air atomization painting, so it is possible to apply a chipping-resistant coating thicker than necessary, and the necessary chipping resistance Performance can be ensured. Further, since the pre-painting is applied to the portion where it is difficult to paint the fuel inlet, the necessary film thickness of the chipping-resistant paint can be ensured on the entire outer surface of the fuel inlet or on the portion which receives the chipping of the outer surface . And since there is a chipping-resistant coating film coated with a substantially uniform film thickness even after chipping, the coating does not peel off and the stainless steel material surface is not exposed, so the rust prevention performance may deteriorate Absent.

  In this way, the fuel inlet coating method can ensure sufficient rust prevention performance even when subjected to chipping.

Hereinafter, a fuel inlet coating method according to an embodiment of the present invention will be described with reference to the drawings.

Embodiment 1
First, the fuel inlet coating method according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing an overall structure of a fuel inlet according to a first embodiment of the present invention. FIG. 2 is a flowchart showing a fuel inlet coating method according to the first embodiment of the present invention.

  As shown in FIG. 1, a fuel inlet 1 according to the first embodiment includes an inlet pipe 2 that guides fuel such as gasoline injected from a fuel injection port 2a to a fuel tank (not shown) connected to a connection port 2b. The inlet pipe 2 is connected by welding in the vicinity 3a of the fuel injection port 2a, and is composed of an air vent from the fuel tank at the time of fuel injection and a breather tube 3 that serves to prevent the fuel from overflowing from the fuel injection port 2a. These inlet pipe 2 and breather tube 3 are both made of the same type of stainless steel material (hereinafter also referred to as “SUS”). In addition, the thick part and pipe part which comprise the fuel inlet 2a of the inlet pipe 2 are electrically welded and connected in the welding part 2c.

  The fuel inlet 1 having such a structure is coated with anti-chipping anticorrosive paint. Specifically, as the portion of the fuel inlet 1 that is difficult to paint, the breather tube mounting portion (wax portion) 3a and the inlet pipe 2 and the breather tube 3 are specifically applied. Intersections 4A and 4B.

  Next, the coating method of the fuel inlet 1 concerning this Embodiment 1 is demonstrated with reference to the flowchart of FIG.

  As shown in FIG. 2, first, in step S1, the viscosity of the anti-chipping rust preventive paint is adjusted. Here, as the anti-chipping anti-corrosion paint, an aqueous acrylic emulsion type anti-chipping anti-corrosion paint was used, and the viscosity was adjusted within the range of 10 Pa · s to 30 Pa · s. Next, pre-coating is performed using this viscosity-adjusted chipping-resistant anti-corrosion paint. That is, the film thickness of the wax inlet 3a and the cross section 4A, 4B of the inlet pipe 2 and the breather tube 3, which are difficult to paint the fuel inlet 1, is applied by brush coating or flow coating with a flow nozzle attached to the tip of an airless gun. It coats so that it may become in the range of 150 micrometers-400 micrometers (step S2).

  Subsequently, before the pre-coating is dried, the chipping rust-preventing paint whose viscosity is adjusted in step S1 is applied to the entire outer surface of the fuel inlet 1 using an airless gun (step S3). Alternatively, the anti-chipping anti-corrosion paint whose viscosity is adjusted in step S1 is applied to only the portion of the outer surface of the fuel inlet 1 that is actually chipped using an airless gun (step S4), and then the normal portion is applied to the unpainted portion. A rust preventive paint is applied (step S5).

  Here, a water-based rust preventive paint was used as the rust preventive paint. As a method of applying the rust preventive paint to the unpainted portion, it can be performed by brush painting, airless atomization or air atomization painting.

  Whether the entire surface is coated (step S3) or the partial coating (step S4), the coating film thickness of the anti-chipping rust preventive paint is applied in the range of 250 μm to 400 μm. After that, if the paint is dried under baking conditions of 100 ° C. to 120 ° C. × 30 minutes to 40 minutes (step S6), the coating process is completed.

  Thus, about the fuel inlet 1 which apply | coated the anti-chipping anti-corrosion paint, after performing the chipping test, the same composite environmental corrosion test as shown by the said patent document 1 was done. As a test sample, a fuel inlet 1 (practical product) coated with an anti-chipping anticorrosive paint was used. For comparison, a fuel inlet 1 (comparative product A) which is an unpainted stainless steel product and a fuel inlet 1 which is a stainless steel product are subjected to the same cationic electrodeposition coating as shown in Patent Document 1 ( A similar test was carried out for comparative product B).

  First, as a test condition for the chipping test, a gravelometer made by SUGA was used as a test machine, 500 g of No. 8 crushed basalt was used as a chipping stone, and air pressure was 0.4 MPa and distance was 30 cm.

  Then, a composite environmental corrosion test was conducted. As test conditions, salt spray (5% NaCl, 50 ° C., 17 hours) → heat drying (70 ° C., 3 hours) → soaked in salt water (5% NaCl, 50 ° C., 2 hours) → air blowing (room temperature, 2 hours) ) As one cycle, this was carried out for 60 cycles, and the rust prevention performance was evaluated by appearance observation. The same test was performed twice for each of the implementation product, the comparison product A, and the comparison product B. The results are summarized in Table 1.

  As shown in Table 1, in the fuel inlet 1 (practical product) coated with the entire surface of the chipping-resistant anticorrosive paint, the welded part 2c, the wax part 3a, and other parts in two tests. The appearance was not changed. On the other hand, in the fuel inlet 1 (comparative product A) which is an unpainted SUS product, pitting corrosion was observed in each part in both tests. In addition, in the fuel inlet 1 which is a SUS product (cationic electrodeposition coating) (comparative product B), peeling of the coating film occurred in the part subjected to chipping in the chipping test in both tests, It was observed that pitting corrosion occurred in the coating film peeling portion.

  In this way, it is possible to uniformly apply high-viscosity (10 Pa · s to 30 Pa · s) anti-chipping anti-corrosion paint that cannot be applied by air atomization, whether brush or airless. The rust paint can be applied thicker than the required film thickness (about 250 μm), and the necessary chipping resistance can be ensured. Further, since the pre-painted portions 3a, 4A and 4B of the fuel inlet 1 which are difficult to paint are applied, the necessary film thickness of the anti-chipping anti-corrosive paint can be secured on the entire outer surface of the fuel inlet 1. And even if it receives chipping, since there is a chipping-resistant antirust coating film, the coating is not peeled off and the surface of the stainless steel material is not exposed, so the antirust performance is not lowered.

  As described above, in the fuel inlet 1 according to the first embodiment and the fuel inlet 1 in which the entire surface is coated with the anti-chipping anti-corrosion paint, sufficient anti-corrosion performance can be ensured even if it is subjected to chipping. .

Embodiment 2
Next, a method for painting a fuel inlet according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a flowchart showing a fuel inlet coating method according to the second embodiment of the present invention.

  As the fuel inlet according to the second embodiment, the same fuel inlet 1 shown in FIG. 1 as that of the first embodiment is used. Therefore, the welding part 2c and the wax part 3a are connected by welding.

  Next, the coating method of the fuel inlet 1 according to the second embodiment will be described with reference to the flowchart of FIG.

  As shown in FIG. 3, first, in step S11, the viscosity of the anti-chipping anti-corrosion paint is adjusted. As the anti-chipping anti-corrosion paint, the water-based acrylic emulsion type anti-chipping anti-corrosion paint is used as in the first embodiment, and the viscosity is within the range of 1 Pa · s to 6 Pa · s (lower viscosity than the first embodiment). Adjusted. Next, the viscosity-adjusted chipping-resistant anticorrosive paint is put in a container, and the fuel inlet 1 is immersed in the container for 2 seconds to 10 seconds at room temperature to perform immersion coating (step S12).

  At this time, when it is difficult for the anti-chipping rust coating to adhere to the inner surface of the inlet pipe 2 of the fuel inlet 1 and the inner surface of the breather tube 3 (for example, organic solvent-based anti-chipping rust-proof coating that dissolves in fuel such as gasoline) ), The fuel inlet 2a, the connection port 2b and the tip opening of the breather tube 3 of the inlet pipe 2 must be tightly closed before being immersed.

  In such dip coating, the anti-chipping anti-corrosion paint sufficiently adheres to the wax part 3a, which is a difficult part of the fuel inlet 1, and the intersecting parts 4A, 4B of the inlet pipe 2 and the breather tube 3. There is an advantage that there is no need. In this way, the coating is performed by immersion coating so that the film thickness is in the range of 150 μm to 800 μm.

  Subsequently, the fuel inlet 1 is pulled up (step S13), vibration is applied to the fuel inlet 1 (step S14), or air blow is applied to the fuel inlet 1 (step S15), thereby thickly attaching the chipping rust-proof paint. To a uniform thickness. As vibration conditions, the frequency is about 10 Hz to about 100 Hz, and the vibration time is within a range of about 5 seconds to about 30 seconds. Moreover, as conditions for air blowing, the pressure is in the range of about 0.1 MPa to about 0.5 MPa. After that, if the paint is dried under baking conditions of 100 ° C. to 120 ° C. × 30 minutes to 40 minutes (step S16), the coating process is completed.

  Thus, about the fuel inlet 1 which apply | coated the anti-chipping anti-corrosion coating material, after performing the chipping test, the composite environmental corrosion test was done. The test conditions are exactly the same as in the first embodiment. That is, as a chipping test, a SUGA gravelometer was used as a test machine, and No. 8 crushed basalt was used as a chipping stone at an air pressure of 0.4 MPa and a distance of 30 cm. And then, salt spray (5% NaCl, 50 ° C., 17 hours) → heat drying (70 ° C., 3 hours) → soaked in salt water (5% NaCl, 50 ° C., 2 hours) → air blowing (room temperature, 2 hours) As one cycle, this was carried out for 60 cycles, and the antirust performance was evaluated by appearance observation.

  As a result, exactly the same as in the first embodiment, no change was observed in the appearance of the welded portion 2c, the wax portion 3a, and other portions. In this way, the coating method of the fuel inlet 1 according to the second embodiment and the fuel inlet 1 in which the anti-chipping anti-corrosion paint has been dip-coated can be applied in a shorter time without being left uncoated, and chipping is received. However, sufficient rust prevention performance can be ensured.

  In each of the above-described embodiments, examples of using an aqueous acrylic emulsion-based anti-chipping anti-corrosion coating as an anti-chipping anti-corrosion coating have been described, but other than that, an aqueous SBR emulsion system, an aqueous acrylic-SBR emulsion system, and further chlorinated. Vinyl sol-based, acrylic sol-based, and other chipping-resistant anti-corrosion paints can be used.

  Other components, components, and composition of anti-chipping anti-corrosion paints for other processes of the fuel inlet coating method, as well as other configurations, shapes, quantities, materials, sizes, connections, manufacturing methods, etc. of the fuel inlet The amount, material, manufacturing method, and the like are not limited to the above embodiments.

FIG. 1 is a perspective view showing an overall structure of a fuel inlet according to a first embodiment of the present invention. FIG. 2 is a flowchart showing a fuel inlet coating method according to the first embodiment of the present invention. FIG. 3 is a flowchart showing a fuel inlet coating method according to the second embodiment of the present invention.

DESCRIPTION OF SYMBOLS 1 Fuel inlet 2 Inlet pipe 2c Welding part 3 Breather tube 3a Breather tube attaching part (wax part)
4A, 4B Intersection

Claims (1)

It is a method of painting a fuel inlet made of stainless steel so that rust prevention does not deteriorate even if chipping is received,
Pre-painting a high-viscosity chipping paint of 8 Pa · s to 50 Pa · s on the difficult-to-paint portion of the fuel inlet, and chipping the entire outer surface of the fuel inlet or the outer surface before the pre-painted portion is dried. By applying the chipping-resistant coating to the portion that receives the chipping, the portion of the fuel inlet that is difficult to paint and the entire outer surface, or the portion of the fuel inlet that is difficult to paint and the portion that receives the chipping of the outer surface are prevented from chipping. A method of painting a fuel inlet, characterized in that the coating is carried out with a substantially uniform film thickness using paint.

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