EP3124650B1 - Method for processing surface of stainless steel, and heat exchanger obtained using same - Google Patents

Method for processing surface of stainless steel, and heat exchanger obtained using same Download PDF

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Publication number
EP3124650B1
EP3124650B1 EP14886931.6A EP14886931A EP3124650B1 EP 3124650 B1 EP3124650 B1 EP 3124650B1 EP 14886931 A EP14886931 A EP 14886931A EP 3124650 B1 EP3124650 B1 EP 3124650B1
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EP
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Prior art keywords
stainless steel
fine
stainless
steel
heat transfer
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EP14886931.6A
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German (de)
English (en)
French (fr)
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EP3124650A1 (en
EP3124650A4 (en
Inventor
Toshinori Kawamura
Akinori Tamura
Hiroshi Nakano
Kazuaki Kito
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Hitachi Ltd
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Hitachi Ltd
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/06—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for producing matt surfaces, e.g. on plastic materials, on glass
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
    • 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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/16—Acidic compositions
    • C23F1/18—Acidic compositions for etching copper or alloys thereof
    • 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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/16—Acidic compositions
    • C23F1/28—Acidic compositions for etching iron group metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
    • F28F13/185—Heat-exchange surfaces provided with microstructures or with porous coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/082—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys
    • F28F21/083—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys from stainless steel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation

Definitions

  • the present invention relates to a surface treatment method for stainless steel.
  • a surface treatment method as described in the preamble portion of patent claim 1 has been known from WO 2006/001818 A2 .
  • Stainless steels are excellent in strength and corrosion resistance and hence, are used in a variety of applications including architectural members, hygienic members and materials for electric appliances and the like.
  • a stainless steel further increased in the corrosion resistance by laminating a coating material or resin film on its surface has been often used.
  • the surface of stainless steel must be roughened for enhancing adhesion between the stainless steel and the coating material or resin film.
  • Surface roughening techniques for stainless steel include: blasting for physically forming an irregular surface; roughening etching for chemically or electrically forming the irregular surface; and combinations thereof.
  • JP 2001-11662 A proposes a method for chemically and uniformly roughening the surface of stainless steel by using an etching solution based on sulfuric acid, chlorine ions and cupric ions.
  • JPH 5-264045 A proposes a method where sandblasting is followed by chemical etching with hydrofluoric acid, nitric acid, hydrochloric acid or aqueous solution of phosphoric acid.
  • WO 2006/001818 A2 discloses a stainless-steel surface treatment method for forming a fine structure on a surface of stainless steel comprising: a first step of performing grain refining treatment for refining crystal grains in the surface of stainless steel; and a second step performed, after the first step, for roughening etching the surface of stainless steel with an etching solution.
  • an irregular structure is formed by preferentially etching crystal grain boundaries. Therefore, the dimensions such as width and height of the irregular structure depend upon the crystal grain size of stainless steel. It is almost impossible to form the irregular structure in dimensions of 10 ⁇ m or less because general stainless steel has the crystal grain sizes in the range of 10 to 200 ⁇ m. Although it is possible to reduce the height of projections by reducing the etching amount, the structure is reduced in surface area with the decrease in height.
  • the structure achieves in maximum a surface area of about 14 times the area of a smooth surface. It is impossible to further increase the surface area of the fine structure.
  • JPH 5-264045 A the combination of sandblasting and etching treatment provides the formation of a complicated irregular structure.
  • a major irregular structure constituting a base is formed by sandblasting using abrasive grains having particle sizes on the order of 100 ⁇ m. It is therefore almost impossible to form the irregular structure in a dimension of 10 ⁇ m or less.
  • an object of the present invention is to provide a stainless-steel surface treatment method for forming a fine irregular structure (roughened surface) having a high surface area on the surface of stainless steel.
  • the present invention can provide a stainless-steel surface treatment method by which a fine irregular structure (roughened surface) having a high surface area can be formed on the stainless steel.
  • Fig. 1 is a flow chart showing the steps of a process of forming a surface fine-structure of stainless steel according to the present invention.
  • the process of the present invention is carried out in the order of grain refining treatment (first step) and roughening etching treatment (second step). It is noted that displacement deposition metal removing treatment (third step) is performed after the roughening etching treatment (second step).
  • a stainless-steel surface treatment method of the present invention for forming a fine structure on the surface of stainless steel is featured by refining crystal grains in the surface of stainless steel, followed by preferentially etching grain boundaries.
  • R1 denotes an irregular structure formed by grain refining treatment of a first step
  • R2 denotes an irregular structure formed by roughening etching treatment as a second step
  • R3 denotes an irregular structure formed by displacement deposition metal removing treatment as a third step, as shown in Fig. 2
  • a final surface fine-structure obtained according to the present invention is R2 or R3. That is, the surface fine-structure obtained according to the present invention does not include the irregular structure (R1) formed by the grain refining treatment of the first step.
  • the grain refining treatment (first step) is processing for forming a fine crystal layer in the surface by refining crystal grains in the surface of stainless steel.
  • This fine crystal layer has a thickness of 1 ⁇ m or more and grain sizes of 1 ⁇ m or less because the final surface fine-structure formed according to the present invention is highly dependent on the thickness and the grain sizes of the fine crystal layer formed by this grain refining treatment.
  • the general stainless steel has grain sizes of 10 ⁇ m or more.
  • the grain refining treatment method is one of either a peening treatment, grinding, turning, machining with grinder, and the like. Above all, the peening treatment is preferred which is adapted for adjustment of the thickness and grain size of the fine crystal layer according to machining conditions such as abrasive grain size and pressure.
  • the roughening etching treatment (second step) is processing for preferentially etching the crystal grain boundaries of the fine crystal layer formed by the first step. Therefore, the composition of a roughening etching solution has strong acidity and contains chloride ions and transition metal ions capable of displacement deposition on iron.
  • the chloride irons have an effect to destroy a passive film composed mainly of chromium oxide generated on the stainless steel surface.
  • the chloride ions are not particularly limited. Examples of the usable chloride irons include hydrogen chloride, sodium chloride, potassium chloride, and the like.
  • transition metal ions capable of displacement deposition on iron have an effect to accelerate the etching of the crystal grain boundaries by inducing the displacement deposition of a metal on iron as a main component of the stainless steel so as to suppress the etching of stainless steel.
  • Preferred transition metal ions capable of displacement deposition on iron are those having an electric potential nobler than a standard potential of iron -0.44(V) and providing high potential difference, which include copper (+0.34(V)), silver (+0.80(V)), palladium (+0.99(V)), platinum (+1.19(V)), and gold (+1.50(V)). Particularly preferred are copper ions which are less costly.
  • the displacement deposition metal removing treatment (third step) is processing for preferentially etching the metal deposited on the stainless steel surface in the second step.
  • Non-selective etching treatment is less preferable because the surface fine-structure constituting the stainless steel is etched away together with the deposited metal. It is therefore important that the composition of the solution used for the displacement deposition metal removing treatment does not contain chloride ions or nitrate ions that accelerate the etching of stainless steel and has a high dissolution rate ratio for stainless steel.
  • the solution composition varies depending upon the type of displacement deposition metal. In a case where the displacement deposition metal is copper, a solution composition containing persulfate or hydrogen peroxide is preferred. In a case where the displacement deposition metal is gold, platinum, palladium, or silver, a solution composition containing potassium cyanide or ammonium peroxosulfate is preferred.
  • the third step is performed in a case where the presence of the displacement deposition metal adversely affects the fine structure on the stainless steel surface in terms of product characteristics.
  • the surface fine-structure is required of corrosion resistance, for example, it is preferred to perform the displacement deposition metal removing treatment if the displacement deposition metal is copper which is prone to oxidation.
  • a scanning electron microscope (SEM) was used for surficial and cross-sectional observation of the surface fine-structure.
  • the height and width of the surface fine-structure were determined from cross-sectional SEM images.
  • out of projections shown in the cross-sectional SEM image five projections having greater heights and widths were measured. The measured values were averaged out and the average values were identified as the height and width of the projection of the surface fine-structure.
  • Krypton gas adsorption method was used for measuring the surface area.
  • the measured surface area was evaluated in terms of surface area ratio on the basis of a smooth test piece not subjected to the process of forming the surface fine-structure.
  • surface chromium concentration was measured by Auger electron spectroscopy analysis method. The measured surface chromium concentration was evaluated in terms of surface chromium concentration ratio on the basis of the smooth test piece not subjected to the process of forming the surface fine-structure.
  • Electron Backscatter Diffraction method (EBSD) was used for observation of the fine crystal layer.
  • EBSD Electron Backscatter Diffraction method
  • a first embodiment is described by way of an example where wet peening treatment was used as the grain refining treatment (first step); a roughening etching solution containing copper ions as the transition metal ions capable of displacement deposition on iron was used in the roughening etching treatment (second step); and a displacement deposition metal removing solution containing persulfate was used in the displacement deposition metal removing treatment (third step).
  • the test pieces were made of SUS304.
  • the wet peening treatment used glass pellets having a diameter of about 50 ⁇ m as abrasive grains and was performed under the conditions: air pressure of 0.33 MPa and conveyance speed of 20 mm/sec. It is preferred to adjust the wet peening treatment conditions according to a required crystal grain size and a required thickness of the fine crystal layer.
  • the composition of the roughening etching solution included: 500 g/l of sulfuric acid; 90 g/l of sodium chloride; and 30 g/l of cupric chloride dehydrate.
  • the treatment was performed at a solution temperature of 40 °C for treatment time of 5 min.
  • the treatment time may preferably be adjusted according to the etching amount required.
  • the composition of the displacement deposition metal removing solution included: 200 g/l of sodium persulfate; and 50 ml/l of sulfuric acid which are capable of selective removal of copper, because the roughening etching solution of the second step employed copper as the transition metal ions capable of displacement deposition on iron.
  • the treatment was performed at a solution temperature of 30 °C for treatment time of 10 min. The treatment time may preferably be adjusted according to the amount of deposited metal.
  • test pieces of the first embodiment were subjected to the surficial and cross-sectional observation by SEM, the surface area evaluation and the fine crystal layer observation.
  • Fig. 3 shows the results of the surficial and cross-sectional observation by SEM and the surface area evaluation. It is confirmed from the surficial and cross-sectional SEM images shown in Fig. 3 that the fine structure having a width of 1 ⁇ m or less and a height of about 3 ⁇ m is formed. The surface area of this fine structure was 21 times the area of the smooth surface. This indicates that the surface fine-structure having a height of 5 ⁇ m or less and a surface area ratio of 15-fold or more can be formed on the stainless steel.
  • Fig. 4 shows the observation results of the fine crystal layer after the wet peening treatment.
  • the fine crystal layer was formed in a depth of about 7 ⁇ m from the stainless steel surface and has a grain size of about 0.8 ⁇ m. This indicates that the fine crystal layer having a grain size of 1 ⁇ m or less and a thickness of 1 ⁇ m or more can be formed in the stainless steel surface.
  • a fine structure was formed on the surface of a test piece under the same conditions as those of the first embodiment except that the treatment time of the roughening etching treatment (second step) in the first embodiment was changed to 3 min.
  • the test pieces of the second embodiment were subjected to the surficial and cross-sectional observation by SEM and the surface area evaluation.
  • Fig. 3 shows the results of the surficial and cross-sectional observation by SEM and the surface area evaluation. It is confirmed from the surficial and cross-sectional SEM images of Fig. 3 that the fine structure having a width of 1 ⁇ m or less and a height of about 1 ⁇ m is formed.
  • the surface area of this fine structure is 15 times the area of the smooth surface.
  • the dimensions or surface area of the fine structure can be adjusted by varying the condition of the wet peening treatment or the etching treatment.
  • the fine structure is decreased in the surface area ratio because of the decreased height of the structure.
  • the fine structure can achieve the 15-fold increase in the surface area ratio.
  • test pieces prepared in the first embodiment were subjected to the passive film evaluation, the corrosion resistance evaluation and the adhesion evaluation. The results are described as below.
  • Fig. 5 shows the results of the passive film evaluation after the formation of the surface fine-structure. It is confirmed that the chromium concentration in the stainless steel surface increased by a factor of 1.5 times over the level before the formation of the surface fine-structure. This is attributable to a fact that chromium dispersed in the stainless steel remains in the stainless steel surface.
  • Fig. 6 shows the results of the corrosion resistance evaluation before and after the formation of the surface fine-structure.
  • the stainless steel before the formation of the surface fine-structure had a rating number of 6 (corrosion area 0.5 to 1.0%) while the stainless steel after the formation of the surface fine-structure had a rating number of 10 (corrosion area 0.0%) . It was thus confirmed that the stainless steel was improved in the corrosion resistance by forming the surface fine-structure by the surface treatment method of the embodiment. Judging from the results of the passive film evaluation, the improved corrosion resistance is considered to be the result of the surface chromium concentration increased by the surface fine-structure forming process.
  • the results of the adhesion evaluation after the surface fine-structure forming process indicate no separation of the polyimide film. That is, high adhesion with the film can be achieved by applying the surface fine-structure forming process to the stainless steel.
  • Comparative Example 1 is described by way of an example where wet blasting treatment was used as a method for forming the surface fine-structure on the stainless steel.
  • the test pieces were made of SUS304.
  • polygonal alumina particles having a particle size of about 15 ⁇ m were used as the abrasive grains under air pressure of 0.2 MPa.
  • Fig. 3 shows the results of the surficial and cross-sectional observation by SEM and the surface area evaluation. It is confirmed from the surficial and cross-sectional SEM images of Fig. 3 that the fine structure having a width of 2 to 3 ⁇ m and a height of about 0.5 ⁇ m is formed in Comparative Example 1.
  • the surface area of the structure of Comparative Example 1 is 3 times the area of the smooth surface.
  • the results of the adhesion evaluation after the surface fine-structure forming process indicate the separation of the polyimide film on the whole area.
  • Comparative Example 2 is described by way of an example where roughening etching treatment was used as the method for forming the surface fine-structure on the stainless steel.
  • the test pieces were made of SUS304.
  • the conditions of the roughening etching treatment were the same as those of the first embodiment.
  • the solution composition includes: 500 g/l of sulfuric acid; 90 g/l of sodium chloride; and 30 g/l of cupric chloride dehydrate. The treatment was performed at a solution temperature of 40°C for treatment time of 5 min.
  • Fig. 3 shows the results of the surficial and cross-sectional observation by SEM and the surface area evaluation. It is confirmed from the surficial and cross-sectional SEM images of Fig. 3 that the fine structure having a width of 2 to 5 ⁇ m and a height of about 3 ⁇ m is formed in Comparative Example 2.
  • the surface area of the structure of Comparative Example 2 is 10 times the area of the smooth surface.
  • the results of the adhesion evaluation after the surface fine-structure forming process indicate a partial separation of the polyimide film.
  • the first and second embodiments are compared with Comparative Examples 1 and 2.
  • the surface fine-structure formed by the wet blasting treatment of Comparative Example 1 is poor in fineness, having a slightly larger distance between fine structures, which may depend upon the size of the abrasive grains.
  • the surface fine-structure formed by the roughening etching treatment of Comparative Example 2 has large widths, which depend upon the size of crystal grains of the substrate because the treatment etches the crystal grain boundaries. That is, it is almost impossible for the conventional surface structure forming methods including the wet blasting treatment and the roughening etching treatment to form, on stainless steel, the surface fine-structure having a height of 5 ⁇ m or less and a surface area ratio of 15-fold or more.
  • a preferred example of the application of the stainless steel formed with a fine irregular structure having a high surface area is an air-cooled heat exchanger performing heat exchange via gas.
  • a shell and tube heat exchanger employing a heat transfer tube made of the stainless steel formed with the surface fine-structure by the surface treatment method of the first embodiment was evaluated for the heat transfer performance.
  • Fig. 7 is a structure diagram of a shell and tube heat exchanger according to a fourth embodiment of the present invention.
  • a circular or polygonal shell 200 is provided with tube plates 202 on opposite sides thereof for supporting heat transfer tubes 201 as the heat transfer part.
  • the tube plate 202 includes a plurality of holes arranged in a staggered fashion and penetrated by the heat transfer tubes 201.
  • the heat transfer tubes 201 are inserted through these tube holes and secured to the tube plates 202 at opposite ends thereof.
  • the length of the heat transfer tube 201 is equal to or more than 25 times the characteristic length D of flow.
  • the characteristic length D of the flow along the tube group of the embodiment is defined by a hydraulic equivalent diameter. In a case where the air flow is turbulent, the heat transfer performance can be further improved by defining the length of the heat transfer tube 201 to be equal to or more than 25 times the characteristic length D of flow.
  • a fine structure 203 is formed on an outside surface of the heat transfer tube 201.
  • Air 204 as a low-temperature fluid, enters the heat exchanger through a nozzle 205 disposed at a side of a lower part of the heat exchanger.
  • the air moves up around the heat transfer tubes 201, exchanging heat with water vapor as a high-temperature fluid via heat transfer tube walls.
  • the water vapor 206 as the high-temperature fluid enters the heat exchanger through a nozzle 207 at a top of the heat exchanger and flows through a water chamber 208 at the top of the heat exchanger and down through the heat transfer tubes 201.
  • the water vapor 206 is condensed into compressed water by heat exchange with the air 204 as the low-temperature fluid via the heat transfer tube walls.
  • the compressed water flows through a water chamber at a bottom of the heat exchanger so as to flow out of the heat exchanger through a nozzle at the bottom of the heat exchanger.
  • the heat exchanger of the embodiment can be increased by about 6% in the heat transfer performance compared with that of a shell and tube heat exchanger using stainless steel subjected to no surface treatment.
  • the application of the stainless steel formed with the surface fine-structure by the inventive surface treatment method provides for the increase in the heat transfer performance without increasing the number of heat transfer tubes.
  • the present invention permits the reduction of the number of heat transfer tubes when achieving a desired heat transfer performance, which leads to the cost reduction of heat exchanger.
  • the heat transfer tube 201 was made of the stainless steel formed with the surface fine-structure by the surface treatment method of Comparison Example 2.
  • the resultant heat exchanger was increased by about 2.5% in the heat transfer performance compared with that of the shell and tube heat exchanger using the stainless steel subjected to no surface treatment. It was thus confirmed that the heat transfer tube 201 was improved further in the heat transfer performance as the surface area ratio thereof increased.
  • the lower the height the better is the fine structure as long as the surface area thereof is constant. This is because the pressure loss increases with the increase in the height of the fine structure.
  • the fine structure having a height beyond a boundary layer can provide the high heat transfer accelerating effect, this effect is traded off against the increase in the pressure loss. This may result in a case where the increased pressure loss wholly cancels out the improvement in heat transfer performance.
  • the boundary layer means a thin layer which exists in vicinity of a contact surface with gas and at which gas viscosity is non-negligible (or which is strongly affected by gas viscosity).
  • the thickness of the boundary layer varies depending upon the specifications of the heat exchanger, namely a variety of requirements such as gas flow rate, mode of gas flow, configurations of the heat transfer part, and the like. From the standpoint of reliably reducing the pressure loss, the fine structure desirably has the lower height and the larger surface area ratio.
  • the surface treatment method of the present invention makes it possible to form the surface fine-structure having the height of 5 ⁇ m or less and the surface area ratio of 15-fold or more, which has been impracticable for the conventional method. Therefore, the heat transfer performance higher than the conventional level can be achieved by applying the stainless steel formed with this fine structure on its surface to the heat transfer part of the heat exchanger.
  • the stainless steel is increased in the surface chromium concentration, featuring excellent corrosion resistance. Accordingly, the stainless steel is preferably applied to the heat transfer part of the heat exchanger required of corrosion resistance.
  • the heat exchanger to which the present invention is applicable is not limited to this.
  • the present invention can be implemented in a heat exchanger which performs heat exchange by making contact with a gas and in which the heat transfer part making contact with the gas is made of the stainless steel.
  • a heat exchanger include: a fin-type heat exchanger (heat sink) for power semiconductor; a cross-fin type heat exchanger for air conditioner or automotive radiator; and the like.

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EP14886931.6A 2014-03-25 2014-09-08 Method for processing surface of stainless steel, and heat exchanger obtained using same Active EP3124650B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014061118A JP6047515B2 (ja) 2014-03-25 2014-03-25 ステンレス鋼の表面加工方法とそれを用いた熱交換器
PCT/JP2014/073606 WO2015145808A1 (ja) 2014-03-25 2014-09-08 ステンレス鋼の表面加工方法とそれを用いた熱交換器

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EP3124650A1 EP3124650A1 (en) 2017-02-01
EP3124650A4 EP3124650A4 (en) 2017-11-15
EP3124650B1 true EP3124650B1 (en) 2019-04-10

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WO (1) WO2015145808A1 (ja)

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CN109297444B (zh) * 2018-11-01 2021-01-05 中国航发成都发动机有限公司 不锈钢模锻件叶片流线检验方法及腐蚀液制作方法
KR20220017884A (ko) 2019-06-11 2022-02-14 미쯔비시 가스 케미칼 컴파니, 인코포레이티드 수성 조성물, 이것을 이용한 스테인리스강 표면의 조화처리방법, 그리고 조화처리된 스테인리스강 및 그의 제조방법
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EP3124650A4 (en) 2017-11-15

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