WO2015037477A2 - スチール製の燃料圧送配管 - Google Patents
スチール製の燃料圧送配管 Download PDFInfo
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- WO2015037477A2 WO2015037477A2 PCT/JP2014/073066 JP2014073066W WO2015037477A2 WO 2015037477 A2 WO2015037477 A2 WO 2015037477A2 JP 2014073066 W JP2014073066 W JP 2014073066W WO 2015037477 A2 WO2015037477 A2 WO 2015037477A2
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- layer
- fuel
- diffusion layer
- plating
- pipe
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
- F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/0243—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member specially adapted for use with coated pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/025—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges
- F16L19/028—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges the collars or flanges being obtained by deformation of the pipe wall
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/08—Coatings characterised by the materials used by metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/05—Fuel-injection apparatus having means for preventing corrosion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/90—Selection of particular materials
- F02M2200/9038—Coatings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/90—Selection of particular materials
- F02M2200/9046—Multi-layered materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/90—Selection of particular materials
- F02M2200/9053—Metals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/90—Selection of particular materials
- F02M2200/9053—Metals
- F02M2200/9076—Non-ferrous metals
Definitions
- the present invention relates to a pipe for supplying fuel to an engine in a gasoline direct injection engine system or a diesel engine system, and particularly to a pipe having resistance to a fuel containing a bad corrosive component.
- gasoline direct-injection engine systems which have been developed to reduce environmental impact by improving fuel efficiency, are equipped with existing pipes that supply fuel (gasoline) from the fuel tank to the engine direct-injection rail via the pump.
- fuel gasoline
- Higher pressure resistance and higher air tightness are required than a cylinder intake port injection engine (see Patent Document 1).
- a diesel engine system in a fuel injection device having a configuration in which an injector for each cylinder is coupled to a high pressure fuel pipe branched from a common fuel supply passage, high pressure resistance and high air tightness are required for the high pressure fuel pipe. (See Patent Document 2).
- a pipe having corrosion resistance is also required for an internal combustion engine that uses a fuel containing a large amount of corrosive components typified by bio-derived alcohol fuel (hereinafter referred to as “corrosive fuel”).
- a fuel pressure feed pipe employing a steel pipe such as low carbon steel, which is cheaper than the stainless pipe has been proposed (see Patent Document 3).
- This steel fuel pumping pipe has an inner surface treatment and / or outer surface treatment that is excellent in resistance to corrosive fuel, in order to obtain high resistance to corrosive fuel.
- a Ni plating layer is formed, and a rust-preventing film layer comprising a Zn plating layer or a Zn-based alloy plating layer is further provided on the Ni plating layer, and further, a Zn plating layer or a Zn-based alloy is formed on the outer surface of the steel pipe. For example, a plating layer is formed.
- Ni plating layer By forming a Ni plating layer and spreading Zn plating on the outer surface of the tube only to a part of the inner surface of the tube, the elution of Zn as a rust preventive component is suppressed to the limit and the corrosion resistance in the tube is reduced by Zn plating.
- the means for supplementing with the sacrificial anticorrosive property When the means for supplementing with the sacrificial anticorrosive property is used, there is a problem that the sacrificial anticorrosive property is lost when all the Zn plating is eluted.
- electroless NiP plating is used for the Ni plating layer, since NiP plating is generally a hard film, there is a possibility that film cracking may occur due to processing after plating. For this reason, electroless NiP plating must be performed after processing into a product shape, which necessitates high costs.
- the present invention has been made in view of the above-described problems of the prior art, and has a high resistance to corrosive fuel and a followability in piping for supplying fuel to an engine in a gasoline direct injection engine system or a diesel engine system.
- the aim is to provide high-quality steel fuel pumping pipes that can be processed after end plating.
- the steel fuel pumping pipe according to the present invention is a steel fuel pumping pipe that pumps fuel in a gasoline direct injection engine system and a diesel engine system from a high-pressure pump to a direct injection rail, and the steel fuel pumping pipe is An Ni plating layer is formed on the inner surface of the steel base steel pipe, and the Ni plating layer is entirely an interdiffusion layer of the base material and Ni (hereinafter referred to as “diffusion layer” for convenience of description), and the diffusion layer.
- non-diffusion layer made of only Ni formed on the outermost surface
- the non-diffusion layer has a thickness of 3 ⁇ m or more
- the total layer thickness of the non-diffusion layer is 10 ⁇ m or more and 25 ⁇ m or less.
- the mutual diffusion layer and the non-interdiffusion layer are provided up to a terminal seal portion of the connection head.
- the present invention includes a base material, a diffusion layer of Ni, and a non-diffusion layer of only Ni formed on the outermost surface of the diffusion layer on the inner surface of the pipe, that is, the fuel flow path region, and the layer of the non-diffusion layer
- a Ni plating layer with a thickness of 3 ⁇ m or more and a total layer thickness of the diffusion layer and non-diffusion layer of 10 ⁇ m or more and 25 ⁇ m or less, fuel pumping with better anticorrosive properties against corrosive fuel in the entire surface of the tube
- the reliability of the gasoline direct injection engine system and diesel engine system is greatly improved.
- FIG. 1 shows an example of a fuel pressure feed pipe connection structure according to the present invention, which has a through-hole 2-1 having a pressure-receiving seat surface 2-2 that opens in a conical shape on the outside, and a male screw on the outer peripheral surface.
- the pressure receiving seating surface 2-2 of the cylindrical mating part 2 formed with 2-3 has a flow path 1-2 at the shaft core and a tapered conical and arcuate seat surface 1-
- the fuel pressure feed pipe 1 having the connection head 1-1 on which the pressure seat surface 1-3 having the pressure 4 is formed is brought into contact with the male screw provided in the mating part 2 and is previously incorporated in the fuel pressure feed pipe 1. Further, it is structured to be fastened by being pressed under the neck of the connecting head portion 1-1 of the fuel pressure feed pipe 1 by screwing with the cap nut 3.
- the steel pipe used as the pipe base material of the fuel pumping pipe 1 of the present invention it is preferable to use a seamless pipe that can be expected to have an appropriate high durability with a more effective action effect on the corrosive fuel.
- the connecting head portion 1-1 of the terminal portion is formed by, for example, a buckling process, a welding process for the joining process can be omitted. For this reason, there is no stress corrosion cracking (SCC) during plastic processing as seen with conventional stainless steel piping, intergranular corrosion and sensitization due to thermal effects during joint processing (increased risk of occurrence of SCC), mechanical properties A decrease in (strength) can be prevented.
- SCC stress corrosion cracking
- the Ni plating layer 4 provided on the inner surface of the fuel pumping pipe 1, that is, the fuel flow path region including the terminal seal portion (seat surface 1-4, etc.) of the pipe is shown in FIG. (Fe) 11 and a Ni diffusion layer (Fe—Ni) 4a and a Ni-only non-diffusion layer 4b formed on the outermost surface of the diffusion layer 4a, and the thickness of the non-diffusion layer is 3 ⁇ m or more
- the total layer thickness of the diffusion layer 4a and the non-diffusion layer 4b is not less than 10 ⁇ m and not more than 25 ⁇ m.
- the thickness of the non-diffusion layer 4b made of only Ni formed on the outermost surface of the diffusion layer 4a is set to 3 ⁇ m or more, and the total thickness of the diffusion layer 4a and the non-diffusion layer 4b is limited to 10 ⁇ m or more and 25 ⁇ m or less. This is because the Ni plating stress is removed by the heat treatment, so that it has followability to the processed portion and sufficiently retains a barrier function against a corrosion attack from the corrosive fuel to the pipe base material.
- the inner surface of the fuel pumping pipe 1 is composed of the pipe base material 11, the Ni diffusion layer 4a, and the Ni-only non-diffusion layer 4b formed on the outermost surface of the diffusion layer 4a. Further, by providing a Ni plating layer having a thickness of 3 ⁇ m or more of the non-diffusion layer 4 b and a total layer thickness of the diffusion layer 4 a and the non-diffusion layer 4 b of 10 ⁇ m or more and 25 ⁇ m or less, for example, it is applied to the outer surface of the tube.
- Corrosion resistance is maintained even if the Zn plating of the fuel pipe in which the Zn plating is applied to a part of the inner surface of the pipe is completely eluted by the corrosive fuel.
- the pipe base material and the Ni diffusion layer 4a have a strong anchor effect due to the mutual diffusion of the pipe base material and Ni, while the non-diffusion layer 4b has improved malleability because stress is removed by the heat treatment. Therefore, film cracking does not occur even in processed parts such as terminal processing and bending.
- the fuel pressure-feeding pipe is corroded without performing the Zn plating. It is possible to maintain the corrosion resistance against the reactive fuel.
- the present invention is not limited by the following examples, and all modifications and implementations within the scope not departing from the spirit are included in the technical scope of the present invention.
- the effect exhibited by the Ni plating layer (rust preventive coating layer) applied to the inner surface of the pipe was determined by conducting a corrosive test on a corrosive fuel and observing the corrosion state (corrosion resistance) visually and with a microscope.
- Examples 1 to 9 Diffusion with a layer thickness of 0.6 to 19.6 ⁇ m on the inner surface of each pipe by conventional electroplating and heat treatment using a steel pipe (test No. 1 to 9) with an outer diameter of 8 mm and an inner diameter of 5 mm as the pipe base material A Ni plating layer (layer thickness of 10 ⁇ m or more and 25 ⁇ m or less) comprising a layer and a non-diffusion layer having a layer thickness of 3.1 to 20.6 ⁇ m was formed.
- Table 1 shows the results of the measurement of the thickness of the Ni plating layer composed of the diffusion layer and the non-diffusion layer of the steel pipe material in this example, the corrosion test, and the followability test (bending test) in the following manner.
- Ni plating layer thickness The thickness of the Ni plating layer composed of a diffusion layer and a non-diffusion layer was measured by line analysis using a scanning electron microscope (JEOL: 6510LA) and an energy dispersive X-ray analyzer (JEOL: JED-2300).
- Corrosion test Corrosive fuel (20% alcohol mixed fuel (gasoline) (including 500 ppm organic acid (formic acid and acetic acid), 5% moisture, 10 ppm chlorine)) is enclosed in each steel tube with Ni plating on the entire inner surface. Then, the corrosion state in the pipe when left for 1000 hours at a temperature of 120 ° C. was confirmed, and the corrosion evaluation was judged by checking the presence or absence of red rust visually and with an actual microscope.
- ⁇ Followingability test: Each steel pipe material with Ni plating applied to the entire inner surface was bent into a U shape with R15, and then the state of film cracking of the plating film in the bent portion was observed using a scanning microscope.
- Table 1 also shows the results of a corrosive test and a follow-up test (bending test) of a stainless steel pipe material (made of SUS304) having the same outer diameter of 8 mm and inner diameter of 5 mm as in Examples 1 to 9.
- the inner surface of the tube is composed of a base material, a diffusion layer of Ni, and a non-diffusion layer of only Ni formed on the outermost surface of the diffusion layer, and the thickness of the non-diffusion layer is 3 ⁇ m or more
- the non-diffused layer is 3 ⁇ m or more, and the total of the non-diffusing layer and the diffusion layer is 10 ⁇ m or more, the rust prevention power against the corrosive fuel is sufficiently maintained, so that the non-processed part and the processed It is clear that red rust is not observed in the parts, and the followability and corrosion resistance are excellent.
- Comparative Example 1 layer thickness 2.1 ⁇ m
- Comparative Example 2 total layer thickness of 28.0 ⁇ m
- Comparative Example 4 total layer thickness 5.5 ⁇ m in which the total layer thickness of the non-diffusion layer and diffusion layer of Ni deviated from the specified value of the present invention, there is no problem in the followability, but from the results of the corrosive test Obviously, since the film is a thin film, the corrosion resistance is inferior to that of Examples 1 to 9 of the present invention, so that it is difficult to employ as a fuel pumping pipe. (6). In Conventional Example 1, since no heat treatment was performed, no diffusion layer was observed, and in the follow-up test, the Ni plating stress could not be removed, so cracking of the film was confirmed in the processed part, and in the corrosive test, cracking of the film was observed.
- Example 10 In order to investigate the effect of the anticorrosive coating layer applied to the inner surface of the fuel pumping pipe shown in FIGS. 1 and 2, particularly to the end seal portion of the pipe, a connecting head similar to that shown in FIGS. Using a steel tube having an outer diameter of 8 mm and an inner diameter of 5 mm, a Ni plating layer (total layer thickness) consisting of a non-diffusion layer with a layer thickness of 7.3 ⁇ m and a diffusion layer with a layer thickness of 7.5 ⁇ m by conventional electroplating and heat treatment 14.8 ⁇ m) was formed.
- a Ni plating layer total layer thickness
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
- Electroplating Methods And Accessories (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
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Abstract
Description
さらに、腐食性燃料に対する高い耐性を得るために、腐食性燃料への耐性に優れる内表面処理及び/又は外表面処理を施したスチール製の燃料圧送配管の場合、例えば管内表面に所望層厚のNiめっき層を形成し、管外表面のZnめっきを管内表面の一部のみに付き回らせることで、防錆成分であるZnの溶出を極限にまで抑えた上で管内の耐食性をZnめっきの犠牲防食性で補うという手段をこうじた場合には、Znめっきが全て溶出すると犠牲防食性が無くなるという問題がある。又、Niめっき層に無電解NiPめっきを用いた場合、一般的にNiPめっきは硬い皮膜であるため、めっき後の加工によって皮膜割れが発生してしまうおそれがある。このため、製品形状に加工した後に無電解NiPめっきを行わなければならず、コスト高を余儀なくされる。
実施例では、配管内面に施したNiめっき層(防錆皮膜層)の示す効果について、腐食性燃料に対する腐食性試験を行い、腐食状況(耐食性)を目視並びに顕微鏡で観察して判定した。
配管母材に外径8mm、内径5mmのスチール製管材(供試No.1~9)を用いて、常法の電気めっきと熱処理により各管内表面に層厚0.6~19.6μmの拡散層と層厚3.1~20.6μmの非拡散層とから成るNiめっき層(層厚10μm以上25μm以下)を形成した。
本実施例におけるスチール製管材の拡散層と非拡散層からなるNiめっき層の層厚の測定、腐食性試験及び追従性試験(曲げ加工試験)を下記要領で行った結果を表1に示す。
拡散層と非拡散層からなるNiめっき層の層厚は、走査電子顕微鏡(JEOL製:6510LA)及びエネルギー分散型X線分析装置(JEOL製:JED-2300)を用い線分析にて測定した。
・腐食性試験:
内面全体にNiめっきが施された各スチール製管材内に、腐食性燃料(20%アルコール混合燃料(ガソリン)(有機酸(蟻酸及び酢酸)500ppm,水分5%、塩素10ppmを含む)を封入して、温度120℃で1000時間放置した時の管内の腐食状況を確認した。腐食評価は、赤錆の有無を目視及び実態顕微鏡にて確認して判定した。
・追従性試験:
内面全体にNiめっきが施された各スチール製管材をR15でU字形に曲げ加工を施した後、走査顕微鏡を用いて当該曲げ加工部のめっき皮膜の皮膜割れ状況を観察した。
実施例1~9と同じ外径8mm、内径5mmのスチール製管材を用いて、常法の電気めっきと熱処理により各管内表面に層厚1.0~22.0μmの拡散層と層厚1.9~6.0μmの非拡散層とから成るNiめっき層を形成した。なお、Niめっき層の層厚の測定は、前記実施例1~9と同じ方法で測定した。
本比較例におけるスチール製管材の拡散層と非拡散層からなるNiめっき層の腐食性試験及び追従性試験(曲げ加工試験)を実施例1~9と同様の方法で行った結果を表1に併せて示す。
実施例1~9と同じ外径8mm、内径5mmのスチール製管材を用いて、常法の電気めっきにより管内表面に層厚7.0μmの非拡散層のみ形成し(拡散層なし)、腐食性試験及び追従性試験(曲げ加工試験)を実施例1~9と同様の方法で行った結果を表1に併せて示す。なお、Niめっき層の層厚の測定は、前記実施例1~9と同じ方法で測定した。
実施例1~9と同じ外径8mm、内径5mmのスチール製管材を用いて、常法の電気めっき及び熱処理により管内表面に層厚7.5μmの拡散層のみ形成し(非拡散層なし)、腐食性試験及び追従性試験(曲げ加工試験)を実施例1~9と同様の方法で行った結果を表1に併せて示す。なお、Niめっき層の層厚の測定は、前記実施例1~9と同じ方法で測定した。
実施例1~9と同じ外径8mm、内径5mmのステンレス製管材(SUS304製)の腐食性試験及び追従性試験(曲げ加工試験)の結果を表1に併せて示す。
実施例1~9と同じ外径8mm、内径5mmのスチール製管材を用いて、無電解NiPめっきにより管内表面に層厚4.6μmの非拡散層を形成し、その管内端末の一部をZnめっきで皮膜したものについて腐食性試験及び追従性試験(曲げ加工試験)を行った結果を表1に併せて示す。
(1).管内表面において、母材とNiの拡散層と、拡散層の最表面に形成されたNiのみの非拡散層とで構成され、かつ非拡散層の層厚が3μm以上で、前記非拡散層と拡散層の合計層厚が10μm以上25μm以下のNiめっき層を形成した実施例1~9の本発明のスチール製管材は、いずれも熱処理によってNiめっきの応力を除去できたことにより加工部に対しても追従性が見られ、非拡散層が3μm以上、かつ非拡散層と拡散層の合計が10μm以上存在することで腐食性燃料に対する防錆力が十分保持されたことにより非加工部及び加工部共に赤錆の発生は見られず、追従性及び耐食性に優れることが明らかである。
(2).非拡散層の層厚が本発明の規定値より外れた比較例1(層厚2.1μm)のものは、追従性には問題ないが、腐食性試験の結果より明らかなように、皮膜が薄膜であることから本発明の実施例1~9に比べて耐食性が劣るため、燃料圧送配管としては採用し難い。
(3).Niの非拡散層と拡散層の合計層厚が本発明の規定値より外れた比較例2(合計層厚28.0μm)のものは、加工部に対しても追従性が見られ、かつ腐食性燃料に対する防錆力が十分保持されたことにより非加工部及び加工部共に赤錆の発生も見られないが、Niの非拡散層と拡散層の合計層厚が規定層厚25μmを超えると前記した通り当該管材の内径寸法が縮小されるため、この場合も燃料圧送配管としては採用し難い。
(4).非拡散層の層厚が本発明の規定値より外れた比較例3(層厚1.9μm)のものは、比較例1と同様に、追従性には問題ないが、腐食性試験の結果より明らかなように、皮膜が薄膜であることから本発明の実施例1~9に比べて耐食性が劣るため、燃料圧送配管としては採用し難い。
(5).Niの非拡散層と拡散層の合計層厚が本発明の規定値より外れた比較例4(合計層厚5.5μm)のものは、追従性には問題ないが、腐食性試験の結果より明らかなように、皮膜が薄膜であることから本発明の実施例1~9に比べて耐食性が劣るため、燃料圧送配管としては採用し難い。
(6).従来例1では、熱処理を行わなかったため拡散層は見られず、追従性試験ではNiめっきの応力が除去できていないため加工部に皮膜の割れが確認され、又、腐食性試験では皮膜の割れが確認された加工部に赤錆の発生が確認されたことにより、本発明の表面処理管材より品質的に劣ることが明らかである。
(7).従来例2では、熱処理によってNiめっきの応力が除去できたことにより、めっき後の加工で皮膜の割れは見られなかったが、表層までFeが拡散してしまい非拡散層が存在しなかったため、腐食性試験では表層に露出したFeを起点に赤錆の発生が見られたため、本発明の表面処理管材より品質的に劣ることが明らかである。
(8).母材管材にステンレス鋼を用いた従来例3では、腐食性試験において加工部、非加工部共に赤錆の発生が見られ、燃料圧送配管としては品質的に十分とは言い得ない。
(9).従来例4の場合は、無電界NiPめっきは一般的に追従性が無いことが知られているため、先に当該管材を加工した後無電解NiPめっきを施したものについて腐食性試験を行った。そのため、加工によるめっきの割れは見られず、腐食性試験でも赤錆の発生は確認されなかった。しかしながら、白錆(Znめっきの腐食)の発生は顕著に見られた。これは、無電解NiPめっきの場合は、ピンホール等の欠陥を完全になくすために数十μmレベルの層厚(膜厚)が必要となるが、従来例4では層厚は4.6μmと薄膜であるものの、Znめっきを管内表面の一部のみに付き回らせることで管内の耐食性をZnめっきの犠牲防食性で補っていたからだと考えられる。なお、この従来例4は曲げ加工後に当該曲げ部にめっき処理を施すため曲げ部の追従性試験及び腐食性試験は未実施である。
図1、図2に示す燃料圧送配管の管内表面、特に当該配管の端末シール部位に施した防錆皮膜層の示す効果を調べるため、図1、図2に示すものと同様の接続頭部を有する外径8mm、内径5mmのスチール製管材を用い、常法の電気めっきと熱処理により層厚7.3μmの非拡散層と層厚7.5μmの拡散層とから成るNiめっき層(合計層厚14.8μm)を形成した。その際、層厚7.3μmの非拡散層と層厚7.5μmの拡散層が存在するNiめっき層をシール部位まで付き回らせ、燃料流路領域全てをNiめっきで被覆した。そのスチール製管材について、前記実施例1~9と同様の要領で行った腐食性試験の結果を表2に示す。
表2に示す腐食性試験の結果より明らかなごとく、本実施例においても赤錆の発生は見られなかった。
実施例10と同じスチール製管材を用い、層厚6.9μmの非拡散層と層厚7.6μmの拡散層とから成るNiめっき層(合計層厚14.5μm)を端末シール部位を除く内面端末部まで被覆したものについて、前記実施例1~9と同様の要領で行った腐食性試験の結果を表2に併せて示す。
本比較例では、層厚6.9μmの非拡散層と層厚7.6μmの拡散層とから成るNiめっき層を端末シール部位まで付き回らせず、内面端末部までしか被覆しなかったため、腐食性試験ではNiめっき層が施されている箇所には赤錆の発生は見られなかったものの、Niめっき層が施されていない端末シール部位に赤錆の発生が確認された。
1-1 接続頭部
1-2 流路
1-3 押圧座面
1-4 シート面
2 相手部品
2-1 貫孔
2-2 受圧座面
2-3 雄螺子
3 袋ナット
4 Niめっき層
4a 拡散層
4b 非拡散層
11 配管母材
Claims (2)
- スチール製母材鋼管の内表面にNiめっき層が形成され、かつそのNiめっき層は全部が母材とNiの相互拡散層と、拡散層の最表面に形成されたNiのみの非相互拡散層とで構成され、かつ前記非相互拡散層の層厚が3μm以上で、前記相互拡散層と非相互拡散層の合計層厚が10μm以上25μm以下であることを特徴とするスチール製の燃料圧送配管。
- 前記相互拡散層と非相互拡散層が接続頭部の端末シール部位まで施されていることを特徴とする請求項1に記載のスチール製の燃料圧送配管。
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EP14844755.0A EP3045712B1 (en) | 2013-09-10 | 2014-09-02 | Steel pressurized feed pipe for fuel |
RU2016113370A RU2629347C1 (ru) | 2013-09-10 | 2014-09-02 | Стальной трубопровод для транспортировки топлива |
MX2016003178A MX2016003178A (es) | 2013-09-10 | 2014-09-02 | Tuberia de acero de transporte de combustible. |
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US9856844B2 (en) * | 2015-04-28 | 2018-01-02 | MAGNETI MARELLI S.p.A. | Fuel pump for a direct injection system with a better hydraulic sealing of the intake valve |
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