Classifications

• • 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
  • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
  • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
  • C23C2/06—Zinc or cadmium or alloys based thereon
• • 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
  • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
  • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
  • C23C2/12—Aluminium or alloys based thereon
• • 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
  • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
  • C23C2/26—After-treatment

Definitions

• the present invention relates to a highly corrosion-resistant Zn-based alloy-plated steel material having a hairline appearance that is used for interior materials such as buildings and vehicles, exterior materials, and surface layers of electrical equipment.
• Stainless steel is well known as a steel material having a conventional hairline appearance.
• hairline finish (HL finish) is specified in JISG 4 3 0 5 and 4 3 0 7 as one of the surface finishes of stainless steel materials, and hair line finishes are “continuous with abrasives of appropriate grain size” This means that the polished surface is long and continuous like hair, as defined as “polished and finished so that it has a polished surface”.
• Figure 1 shows an overview of hairline finishing.
• the usual hair finishing method is to use an endless paper polishing belt 3 that spans the contact wheel 1 and the handle 2 and the contact wheel. It is well known that this is a processing method of polishing the surface of a stainless steel material 6 that is rotated at a high speed by rotating and moving from the uncoiler 4 to the coiler 5 with a polishing belt (for example, Japanese Patent Laid-Open No. 1-3 0 6 1 6 And Japanese Patent Publication No. 7-9 6 1 8 3).
• Stainless steel with a hairline finish is corrosion resistant and has a unique surface pattern, so it is widely used for interior materials for exterior materials and exterior materials for electrical equipment, where design is important.
• a new inexpensive material that replaces stainless steel has high corrosion resistance similar to stainless steel, and has a hairline appearance suitable for use in building materials and electrical equipment. desired.
• the present inventor paid attention to a zinc-plated steel material that has excellent corrosion resistance and is inexpensive as well as a stainless steel material, and studied to apply a hairline finish thereto.
• the conventional technology for applying a hairline finish to a plating layer is to form a plating coating layer on the surface of a thin and light magnesium-based member, and then form a hairline pattern on the surface of the plating coating layer by a hairline finish.
• a technique has been proposed that solves the problem that the base of the plating coating layer comes out and the corrosion resistance deteriorates, and a stable and high quality member cannot be obtained.
• a glazing coating layer selected from Cu, Cu alloy, Au, Au alloy, Al, A1 alloy formed on the surface of Mg-based parts by the dry soldering method (1 ), And Cu, Ni, Au, Cr, Zn, Pa, Pt, Rh, F formed on the plating coating layer (1) by a wet plating method.
• This is a technique for applying a hairline finish to the surface of an Mg-based part having a plating coating layer (2) selected from e, Co, Sn, Cd, Ru, and alloys thereof (for example, JP-A 2 0 0 0—See 2 1 9 9 7 gazette).
• this technique requires a double thick plating coating layer, and it is necessary to combine the dry plating method with the wet plating method. It is difficult to adapt it to steel.
• a Zn-A1-Mg alloy-plated steel sheet has a mass of 0 /.
• An object of the present invention is to provide a highly corrosion-resistant zinc-based alloy-plated steel material having a hairline appearance that can be similarly applied to the same use as that of a stainless steel material having a hairline appearance.
• the present inventor has eagerly studied hairline finishing on a zinc-plated steel material, which is a material cheaper than stainless steel material and having similar corrosion resistance as a material to replace a stainless steel material having a hairline appearance.
• a hairline finish is applied to a pure zinc-plated steel material, zinc is soft, so the formed hairline can be easily pickled, and the hairline finish polishing belt is easily clogged during processing. The hairline could not be obtained, and the hairline finishing was difficult.
• galvanized steel with a hairline finish has white rust on the surface of the zinc in the atmosphere, and the appearance of the hairline disappears when the white rust is generated, eliminating the effect of forming the hairline. wait.
• the present invention when focusing on the high corrosion resistance Zn-based alloy plating including a hard phase in the adhesion layer, and applying a hairline finish to this, a high corrosion resistance zinc plated steel material having a good hairline appearance is obtained. As a result, the present invention was completed.
• the gist of the present invention is as follows.
• Metsusa adherence is 10 ⁇ 60 0 g Zm 2 and A 1 is 1 ⁇ 6
• Mg is contained in an amount of 0.1 to 10% by mass, and the balance has a hairline formed on the surface layer of the plating it made of Zn and inevitable impurities.
• the surface roughness R a in the perpendicular direction is 0.2 to
• peak number PPI is 50 to 400
• surface roughness Ra in hairline direction is 0.1 to 1 • 2 ⁇ m
• peak number PPI force is: L
• the surface roughness Ra in the direction perpendicular to the hairline is 1 • 2 times the surface roughness Ra in the hairline direction
• the PPI in the direction perpendicular to the hairline is 2.0 of the PPI in the hairline direction.
• High corrosion-resistant zinc alloy galvanized steel with hairline appearance characterized by being more than double.
• Amount of adhesion is 10 to 6 000 g Zm 2 and A 1 is 1 to 6
• the hairline has the number of peaks perpendicular to the hairline; P P I force S 50
• the amount of plating is 10 to 60,000 g "m 2 , 1 to 60% by mass of A 1, 0.1 to 10% by mass of Mg, the balance being Zn and inevitable Hairline formed on the surface of the plating layer consisting of mechanical impurities
• the hairline has a surface roughness Ra in the angular direction of the hairline of 0.1.
• the surface roughness R a in the direction perpendicular to the hairline is 0 and more than 1. times the surface roughness Ra in the hairline direction, and the PPI in the direction perpendicular to the hairline is 5006975
• a highly corrosion-resistant zinc-based alloy-plated steel material having a hairline appearance characterized by being 2.0 times or more the PPI in the hairline direction.
• the plated layer further contains 3 1 in an amount of 0.001 to 3% by mass.
• the hair appearance according to any one of (1) to (3) High corrosion resistance Zn-based alloy steel.
• the plating layer further contains one or two of T i from 0.001 to 0.1% by mass and B from 0.000 to 0.1% by mass. (1) to (4) characterized in that the high-corrosion-resistant Zn-based alloy-plated steel material having the hairline appearance.
• the plating layer has a volume ratio of 1 to 80 V o 1% for the binary eutectic of Zn and A 1, and a volume ratio of 1 for the ternary eutectic of the Zn, A 1 and Zn Mg alloy. 0 ⁇ 90 V o 1%, the total of both is 50% or more
• the surface of the plating layer has a chromium-free treatment layer that does not contain chromium in an amount of 1 to 20 ⁇ mg Zm 2 (1) to
• a high corrosion resistance Z having a hairline appearance according to any one of (1) to (8), characterized by having a transparent resin film layer having a thickness of 0.5 to 100 m on the surface. n-base alloy steel.
• Figure 1 shows an overview of hairline finishing.
• Fig. 2 is a diagram showing the structure of the Zn-based alloy plating layer of the present invention.
• A is a photomicrograph of the Zn-based alloy plating layer of the present invention, and
• B is a schematic diagram of the structure. It is.
• Fig. 3 shows high corrosion resistance Zn alloy steel with a hairline finish (Zn— 1 1% A 1 — 3 Mg — 0. 2 Si plating, plating basis weight: 90 g / m 2 ) Is a cross-sectional photomicrograph (magnification: 100000 times) of the surface after polishing # 80.
• Steel materials with a hairline appearance include stainless steel materials with a hairline finish, but stainless steel materials are expensive. Therefore, the present inventors paid attention to a zinc-based plated steel material having high corrosion resistance as in the case of stainless steel materials, and researched on applying a hairline finish to the zinc-based plated steel material.
• the zinc alloy-based plating layer containing a hard layer is a zinc alloy-based plating layer containing Al and Mg, which is a binary eutectic of Z n and A 1 and Z It has been found that a plating layer containing n, A 1 and a ternary eutectic hard layer of a ZnMg alloy is suitable.
• the component of the plating layer is 0 / mass.
• a 1 1.0 to 60%
• Mg 0.1 to 10%, balance Zn and unavoidable impurities, and for the purpose of improving corrosion resistance.
• 0 0 1 to 3.0% for the purpose of improving the appearance
• T i 0. 0 0 0 1 to 0.1%
• B 0. 0 0 0 1 to 0.1% 1 type or 2 types It may be selected and contained as necessary.
• a 1 together form a ternary eutectic of Z n / two yuan eutectic of A 1 and Z n ZA 1 / Z n 2 M g of the hard phase in plated layer, improve the corrosion resistance of the plated layer In addition, it has the effect of suppressing dross generation in the plating bath.
• a 1 is less than 1.0%, the volume occupancy of the binary eutectic and ternary eutectic, which is a hard phase, is insufficient, and a good hairline with an excellent appearance cannot be obtained with a hairline finish.
• the corrosion resistance of the plated steel material is inferior.
• a 1 exceeds 60%, sink-like depressions occur on the surface of the mating surface, and the appearance cannot be made uniform, and the effect of improving the corrosion resistance is saturated and at the same time the sacrificial anticorrosive action against the base iron is achieved. Disappears, and the corrosion resistance of the buttock deteriorates. Therefore, the content of 1 is set to 1.0 to 60%.
• Mg is a component necessary to form a ternary eutectic and It has the effect of forming corrosion products on the surface and improving the corrosion resistance of the steel. If Mg is less than 0.1%, the occupancy rate of the ternary eutectic is insufficient, and a good hairline with an excellent appearance cannot be obtained with a hairline finish, and corrosion generation is necessary to improve corrosion resistance. Things cannot be formed. On the other hand, if Mg exceeds 10%, oxidation of the bathing bath proceeds due to contact with the atmosphere to produce black oxide (dross), making it difficult to squeeze and saturate the effect of improving corrosion resistance. . Therefore, the Mg content was set to 0.1 to: 10%.
• Si is added as necessary to improve corrosion resistance and plating adhesion. If the added amount is less than 0.001%, these effects cannot be obtained.If the added amount exceeds 3.0%, these effects are saturated, and instead dross generation increases. ⁇ ⁇ 1 to 3. ⁇ %.
• T i is a component added as necessary to generate primary A 1 phase precipitation nuclei, refine the structure and improve the appearance, and it is necessary to add 0.001% or more. is there. However, if added over 0.1%, the solubility in the plating bath will be exceeded, and Ti 1 A 1 -based precipitates will grow, resulting in irregularities on the surface of the plating layer and deterioration in appearance quality. 1 was set to 0.0% 0 to 0.1%.
• B has the effect of improving the appearance of the eye as T i .However, the effect cannot be obtained if it is less than 0.001%, and the effect is saturated if it exceeds 0.1%. , B was set to 0.0 0 ⁇ 1 to ⁇ . 1%.
• Fig. 2 (a) with an upper limit of 600 g Zm 2 is a photomicrograph of the structure of the Zn-based alloy plating layer of the present invention
• Figure 2 (b) is a schematic diagram of the organization.
• the cross-sectional structure of the highly corrosion-resistant Zn-based alloy layer consisting of Zn— 1 1% A 1 _ 3% Mg — 0.2%
• S i is [Z n / A 1 / Z n 2 M g] ternary eutectic phase 7 is mixed with [Z n / A 1] binary eutectic phase 8 and [Z n 2 Mg Single phase] 9 is an island-like structure.
• This ternary eutectic phase has a structure in which soft Zn and A 1 phases and hard Zn 2 Mg are mixed and dispersed, and the entire structure has both stickiness and hardness. Show properties. If a steel plate with such a phase is also present on the surface, the plating surface is easily peeled off from the plating surface by the abrasive belt without causing a sag in the hairline peak. A beautiful hairline can be obtained, and a good hairline with excellent appearance can be obtained without clogging the polishing belt.
• Fig. 3 shows the high corrosion resistance Zn-based alloy steel with a hairline finish (Zn— 1 1% A 1 — 3 M g— 0.2 S i plating, plating basis weight: 90 g / m 2 ) is a cross-sectional photomicrograph (magnification: 100000 times) of the surface after polishing # 80. As shown in Fig. 3, it has a good appearance without sagging in the groove of the hairline.
• [Zn / A1] binary eutectic phase occupies the volume as the structure of the plating layer At a rate :! ⁇ 8 0 vo 1%, [ Z n / A 1 / Z n 2 M g] Sangentomo phase is present 1% 1 0 ⁇ 9 0 V o in volume occupancy, the remainder Z n, Z n 2 M g alloy, M g 2 S i, is preferably a structure consisting T i a l 3 like.
• the binary eutectic phase is softer than the ternary eutectic phase, but harder than the Zn and A1 single phase. Therefore, the smaller the volume occupancy, the more the hairline treatment Improves. If it is 90 V o 1% or more, the entire plating layer becomes soft and the hairline property is inferior, and it is difficult to engineering to 1 V 0 1% or less.
• the volume ratio of the ternary eutectic decreases, the hardness and stickiness characteristics of the plating layer decrease, the appearance during hairline treatment deteriorates, and clogging of the abrasive due to debris tends to occur. Therefore, the lower limit of the volume occupancy of the ternary eutectic was set to 10 V 0 1%.
• the upper limit was that the A 1 phase and Zn 2 Mg phase were likely to occur during the solidification process of the plating layer, and 90 vo 1% was the upper limit in engineering production.
• the volume fraction of the eutectic phase combined with both decreases, the hardness and viscosity of the entire plating layer decrease and the appearance of the hairline becomes poor.
• the thickness of the plating layer suitable for performing the hairline finish is in the range of 10 to 600 g / m 2 , preferably 10 to 500 g / m 2 . If the adhesion amount is less than 10 g / m 2 , the adhesion layer is too thin, resulting in insufficient corrosion resistance and exposing the steel substrate with a hairline finish. If the coating weight exceeds 600 g / m 2 , the plating layer will become too thick to make the plating layer uniform in appearance, and the plating layer will be easy to peel off. Further, it is not preferable. Therefore, the coating weight and 1 0 ⁇ 6 0 0 g Z m 2.
• the surface roughness in the direction perpendicular to the hairline (C direction) is surface roughness: a: 0.2 to 2.5 ⁇ , preferably Is 1.2 to 1.8 ⁇ and the number of peaks is ⁇ ⁇ I: 50 to 400, and the surface roughness in the hairline direction (L direction) is a: 0.1 to 1.2 / m, preferably Is 0.5 to 1.
• ⁇ ⁇ ⁇ and the number of peaks ⁇ ⁇ 1 is 1 to 100
• R a in the direction perpendicular to the hairline (C direction) is in the hairline direction (L direction); 1.
• C direction More than 2 times (C direction: a / L direction: a ⁇ 1.2) and hairline perpendicular direction (C direction
• the PPI in the direction is preferably at least twice the PPI in the hairline direction (L direction) (C direction PPI / L direction PPI ⁇ 2).
• the shape of the hairline is defined by the surface roughness, the number of peaks, and the ratio thereof as described above.
• the surface roughness Ra was measured by adopting a reference length of 0.8 mm in accordance with the measurement method defined in JISB 060 (199).
• the peak number PPI P eaks Per Inch
• the peak number PPI is 1 inch according to the regulations of S AE J 9 1 1 — 1 9 8 6 and the width 2 H between the positive and negative reference levels is 5 0 ⁇ inch. And measured.
• hairline finishing is performed using a belt sander (abrasive belt) of # 60 to # 320. It is preferable to carry out.
• a primary anti-bacterial treatment by applying a chromate treatment or a chromate-free treatment to the plating layer.
• the anti-glare coating layer can be formed by applying a chromate treatment or a chromate-free treatment after the hairline finish is applied to the plating layer.
• the primary defense process to form In the case of chromate treatment, it is possible to apply a known chromate treatment, for example, a chromate treatment with a chromate treatment solution containing chromic acid and a reaction accelerator as main components. can be a click Rome preparative adhesion amount with 1 ⁇ 2 OO mg Zm 2.
• the amount of chromate is less than 1 mg / m 2 , a sufficient anti-mold effect will not be obtained, and if it exceeds 200 mg / m 2 , not only will the hairline finish be inconspicuous, The effect is saturated and the cost is increased economically.
• the primary defense process can also be performed by a known chromate free process (non-chromate process).
• Chromate-free treatment does not contain environmentally harmful hexavalent cucumber in the treatment solution.
• treatment solution containing Zr, Ti salt, etc.
• a treatment liquid containing a pipetting agent There is a treatment liquid containing a pipetting agent, and a chrome free treatment using a known chrome free treatment liquid can be applied.
• a chromate-free treatment layer that does not contain chromium, mainly composed of Ti, Zr, P, Ce, Si, A1, Li, etc., is formed.
• the adhesion amount is preferably 1 to 100 O mg Zm 2 .
• the plating surface will oxidize and turn black. If the color changes to black (black), the hairline finish becomes inconspicuous and the appearance of the hairline is impaired. In addition, the zinc plating layer tends to wrinkle when it collides with a hard object. For this reason, the plated surface with the hairline finish is transparent. If the bright resin coating layer is formed to a thickness of 0.5 to 100 m, the blackening resistance and the scratch resistance can be improved.
• the transparent resin coating layer can be formed by a conventionally known coating method using a conventionally known organic clear paint.
• organic clear paints include acrylic-based baking clear paints, urethane-based clear paints, epoxy-based clear paints, and polyester-based clear paints. Paints, melamine alkyd clear paints, and the like. Of these, polyester-based and acrylic-based clear paints are preferably used.
• the coating method of the organic clear paint include a roll coater method, a curtain coater method, a spray gun method, and an electrostatic method.
• the roll coater method and the curtain coater method are preferable.
• one or more metal states or hydroxylation of Co, Fe, Ni, Pt, and Mn are used in the vicinity of the interface with the chromate or chromate-free treatment layer. It is advisable to apply a physical deposit layer.
• This deposit layer has a good adhesion amount of 0.1 to 1 O mg Zm 2 , preferably 0.5 to 3. O mg Zm 2 .
• This treatment greatly improves the resistance to blackening in a humid environment.
• the effect of blackening resistance is at a coverage is 0. lmg Zm 2 or less is not sufficient, 1 0 mg Zm 2 or more, the corrosion resistance of the deterioration caused undesirable.
• the method for applying the treatment layer is not particularly limited, but examples include an immersion method of the salt aqueous solution, a spray method, and a vacuum deposition method.
• a steel plate with a hairline treatment is immersed in the metal salt aqueous solution of 0.1 to 1 ° g / L for 0.5 to 10 seconds and then washed with water.
• Plating was performed by heating, annealing, and plating in a non-oxidizing furnace type continuous molten zinc plating line.
• the annealing atmosphere encloses an atmosphere of 10% hydrogen and the remaining 90% nitrogen gas, with a dew point of 130 ° C.
• the annealing temperature is 7 30 ° C and the annealing time is 3 minutes.
• the composition of the plating bath is, by mass, A1: 11.0%, Mg: 3.0%, Si: 0.2%, the balance Zn and inevitable impurities, and the plating bath temperature is The temperature was 45 ° C.
• the coating amount was adjusted by the usual nitrogen gas wiping method.
• hairline finishing was performed using a belt sander with different count (size 100 mm x 9 15 mm) at a belt speed of about 3.5 Z seconds and a polishing time of 3 to 4 seconds. Thereafter, the surface roughness (R a) and the number of peaks (P P I) were examined.
• No. 3 subjected to # 80 bead blast treatment had uniform fine irregularities formed on the surface, but the surface roughness in the L direction and the number of peaks were small, and The ratio of the surface roughness and the number of peaks was small and did not satisfy the requirements specified in the present invention, and the bead blasting and hairline finishing were clearly different.
• No. 4 was finished with a hairline, but the belt sander was too rough as # 600 and did not meet the hairline requirements stipulated in the present invention. I could not observe.
• No. 6 and No. 7 are cases where the hairline finish was not performed, but in this case, the surface roughness in the C direction and the number of peaks were small. And their ratio was small. Of course, no hairline was observed in this case.
• chromate treatment chromate-free treatment, clear coating treatment, and blackening resistance treatment were performed using a steel plate with a composition of Z n _ ll A l — 3 Mg _ 0.2 Si. It was.
• the chromate treatment is chromic acid 1 After applying the 0 g / 1 solution, it was dried for 30 seconds in a hot air oven at 60 ° C.
• a chemical agent consisting of ammonium zirconium carbonate, cobalt nitrate, silica, and ammonium phosphate was applied and then dried in a hot air oven at 60 ° C. for 30 seconds.
• melamine alkyd clear paint solvent type
• acryl type clear paint water dispersion type
• the plate was heated to a plate temperature of ° C (Atalyl type).
• the blackening resistance treatment was immersed in an aqueous solution of lg ZL in sulfuric acid Ni for 3 seconds, then washed with water and dried, and then applied with the above chrome-free treatment and melamine alkyd clear coating.
• the evaluation of the corrosion resistance on the flat surface was determined by the amount of white mist generated after 2400 hours of salt water fog test of JISZ 2 3 3 1, ⁇ : White mist generated 1% or less, and X: 10% or more.
• the cross cut portion was evaluated by a blister width after 100 hours of the salt spray test, and judged as follows: ⁇ : less than 2 mm, X: 2 mm or more.
• the blackening resistance was evaluated by allowing the treated steel to stand in a high-temperature and high-humidity tank at 60 ° C. and a relative humidity of 85% for 7 days, and evaluating the color difference ⁇ E value between before and after standing.
• the color difference ⁇ ⁇ was measured according to JISZ 8 7 2 2. When ⁇ E is 1 or less, there is no blackening (good), 1 to 2 are slightly good ( ⁇ ), and when it is larger than 2, blackening is recognized and defective (X).
• N o.. 1 to 4 6 are ⁇ varying process specified in the present invention, the pretreatment, which satisfies the requirements paint, flat section, click Rosuka' isolation portion both corrosion 1 students good der ivy.
• N 0.23 and 4 6 that had undergone blackening resistance also had excellent blackening resistance.
• ⁇ Beautiful hairline ⁇ : The size is attached to the sander.
• the highly corrosion-resistant zinc-plated steel material having a hairline appearance according to the present invention has a good hairline appearance and excellent corrosion resistance. Therefore, it is similar to the use of a stainless steel material having a conventional hairline appearance. It can be applied to applications. Moreover, it can be supplied at a lower price than expensive stainless steel materials.

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• 2005
  • 2005-02-08 JP JP2005031542A patent/JP4546848B2/ja active Active
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