Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D1/00—Processes for applying liquids or other fluent materials
  • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D1/00—Processes for applying liquids or other fluent materials
  • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D1/00—Processes for applying liquids or other fluent materials
  • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
  • C09D175/04—Polyurethanes
  • C09D175/06—Polyurethanes from polyesters
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
  • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
• • 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
  • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
  • C23C26/02—Coating not provided for in groups C23C2/00 - C23C24/00 applying molten material to the substrate
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D3/00—Electroplating: Baths therefor
  • C25D3/02—Electroplating: Baths therefor from solutions
  • C25D3/22—Electroplating: Baths therefor from solutions of zinc
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D3/00—Electroplating: Baths therefor
  • C25D3/02—Electroplating: Baths therefor from solutions
  • C25D3/56—Electroplating: Baths therefor from solutions of alloys
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
  • C25D5/48—After-treatment of electroplated surfaces

Definitions

• composition for surface treatment of single-coated steel sheet steel sheet surface treated using the same, and surface treatment method using the same
• the present invention relates to a composition for surface treatment of a single-coated steel sheet, a steel sheet surface-treated using the same, and a surface treatment method using the same.
• Steel plates used for fuel tanks of vehicles such as automobiles and motorcycles are directly related to the safety of the vehicle.It is a key component, and it has basic strength and durability, but also has corrosion resistance to fuel, fuel tanks and other subsidiary materials. It is necessary to secure a certain level of quality such as weldability to prevent fuel leakage at the joint part to be connected.
• the plating method of the thick metal materials such as lead (Pb), tin (Sn), chromium (Cr) has been actively studied.
• Pb lead
• Sn tin
• Cr chromium
• Acryl-urethane copolymer resin (A); Si— Zr-Ti organic-inorganic hybrid (hybr id) Additive (B); And a solvent;
• the Si-Zr-Ti-based organic-inorganic hybrid additive (B) is formed by the reaction of a silicon (Si) material, a zirconium (Zr) chelating agent, a titanium (Ti) chelating agent, and a neutralizing agent. Chelate compounds.
• the silicon (Si) -based material may be one, or a mixture of two or three kinds selected from silicon (Si) -based materials including colloidal silica, silica sol, and silicates.
• the zirconium (Zr) -based chelating agent is one selected from zirconium (Zr) -based chelating agents including zirconium alkoxide, zirconium acylate, tetraalkyl ziconate, Or two to three kinds of mixtures.
• the titanium (Ti) chelating agent nuxafluoro titanic acid (Hexafluloro
• Titanic Acid Fluorot itanic Acid, Titanium Dioxide, Titanium Nitrate, Titanium Sulfate, Titanium Tetrachloride, Tetrabutoxyt itanium, It may be one, or two to three mixtures selected from titanium (Ti) chelating agents including Hexafluoro Ammonium Titanate, and Titanium Alkoxide.
• the neutralizing agent may be one kind or two to three kinds of mixtures selected from amine compounds including isopropyl amine and trimethyl amine.
• the acrylic-urethane copolymer resin (A) is an acrylic resin and a urethane It may be a block copolymer of a resin:
• the acryl-urethane copolymer binder resin is a block copolymer of an acrylic resin having a number average molecular weight of 50 to 1,500, 000 and a urethane resin having a number average molecular weight of 5,000 to 15,000, wherein the acryl-urethane
• the copolymerization ratio of the acrylic resin in the copolymer binder resin may be 40 to 60% by weight.
• the surface treatment composition may further include a coupling (coupling) agent, adhesion promoter, or a mixture thereof;
• the coupling (coupling) agent gamma-glycidoxypropyl triethoxy silane, gamma-amino propyltriethoxy silane (g- Am i no r opy 11 riet hoxy si lane), tetraethoxy silane ' (Tetraethoxy si 1 ane), methyl trimethoxyl silane (methyl tr imethoxy si lane), and
• It may be one, or two to three or more mixtures selected from silane-based coupling agents, including 3-Glycidoxypropyl tr imethoxysi lanes.
• the surface treatment composition further comprises the coupling (coupling) agent, the content of the coupling (coupling) agent to the total amount (100% by weight) of the surface treatment composition, 0.5 to It may be 10% by weight.
• the adhesion promoter may be an acid ester, ammonium phosphate, or a combination thereof.
• the surface treatment composition further includes the adhesion promoter, and the content of the adhesion promoter with respect to the total amount of the surface treatment composition (100 weight 3 ⁇ 4) may be 2 to 20% by weight.
• the single-sided coated steel sheet includes a first plated layer disposed on one side of the non-rolled steel sheet and the cold rolled steel sheet,
• the surface treatment layer is located on the first plating layer of the single-coated steel sheet and includes an acrylurethane copolymer resin (A) and a Si-Zr-Ti-based organic-inorganic hybrid additive (B). Satisfied with all It provides a surface-treated single-coated steel sheet.
• [A] and [B] means the content of A (% by weight) and the content of B (weight 3 ⁇ 4>) relative to the total amount of the surface treatment layer (100% by weight), respectively.
• the surface treatment layer may be formed using the above-described surface treatment composition.
• the surface-treated single-coated steel sheet may be formed using the above-described surface treatment composition.
• the mass of the surface treatment worm per single side of the single-side coated steel sheet may be 300 to 2500 mg / m 2 .
• the mass of the first plating layer per single side of the additive steel sheet may be 5 to 300 g / m 2 .
• the single-coated steel sheet further includes a second plating layer inevitably present on the other side of the non-rolled steel sheet, the mass of the second plated layer per side of the non-rolled steel sheet is 10 mg / m 2 or less (but, 0 mg / m 2 ).
• Preparing a single-sided coated steel sheet comprising a natural steel sheet and a first plating layer located on one side of the natural steel sheet;
• the surface treatment composition includes an acrylic-urethane copolymer resin (A), a Si-Zr-Ti-based organic-inorganic hybrid (hybrid) additive (B), and a solvent, wherein the following Formulas 1 and 2 are satisfied: ,
• the surface treatment composition used in the surface treatment method of the single-sided coated steel sheet may be the same as described above.
• the surface treatment method of the single-sided coated steel sheet except for the description overlapping with the above-described ones Provide an explanation.
• Applying the surface treatment composition on the first plating layer of the single-side coated steel sheet may be performed by a coating method, a spray method, or a deposition method.
• curing the coating composition for the surface treatment may be to be carried out at a temperature range of 130 to 250 ° C.
• the step of preparing a single-coated steel sheet may be performed by using a plating bath in which a current mask (edge mask) is located on one side.
• the steel sheet surface-treated using the composition for surface treatment of single-coated steel sheet there is an environment-friendly yet excellent corrosion resistance and weldability.
• FIG. 1 schematically illustrates a surface treated single-coated steel sheet according to an embodiment of the present invention.
• FIG. 74 schematically shows a fuel resistance evaluation apparatus used in the evaluation example of the present invention.
• Figure 3 schematically shows the overall process of one-side plating and surface treatment, used in the embodiment of the present invention.
• Acrylurethane copolymer resin (A); Si-Zr-Ti-based organic-inorganic hybrid (hybr id) additive (B); And a solvent;
• composition for surface treatment of a single-coated steel sheet is provided.
• Equation 1 0.3 ⁇ [A] / ([A] + [B]) ⁇ 0.7
• the surface treatment composition does not contain heavy metal materials such as lead (Pb), tin (Sn), and chromium (Cr), which is environmentally friendly, and can secure excellent corrosion resistance by the acrylic-urethane copolymer resin (A).
• Pb lead
• Sn tin
• Cr chromium
• the surface treatment composition does not contain heavy metal materials such as lead (Pb), tin (Sn), and chromium (Cr), which is environmentally friendly, and can secure excellent corrosion resistance by the acrylic-urethane copolymer resin (A).
• Pb lead
• Sn tin
• Cr chromium
• the acrylic-urethane copolymer resin (A) and the Si-Zr-Ti-based organic-inorganic hybrid (hybrid) additive (B) is included as a main component, the content thereof is the formula It needs to be controlled to satisfy 1 and 2 simultaneously.
• Equation 2 with respect to the total content of the A and the B in the surface treatment composition, when the ratio of the content of A is 0.3 or less, layered corrosion resistance Not only is it difficult to secure, but also the adhesiveness to a steel plate (specifically, single-side plated steel plate) can fall. On the other hand, in the case of 0.7 or more, the conductivity may be degraded and the weldability may be deteriorated.
• the surface treatment composition may be used for the surface treatment of single-sided plating. Specifically, after coating the surface treatment composition on the plated layer of the single-side coated steel sheet, baking and curing, it is possible to obtain a steel sheet having a plated layer and a surface treatment layer formed only on one side.
• the one-sided plated layer and the surface-treated layer are excellent in corrosion resistance and weldability, and are suitable for application as a fuel contacting surface. Except for the plating layer and the surface treatment layer which are inevitably formed at the time, the separate treatment or the surface treatment is not performed, so that the surface treatment layer may cause problems such as a decrease in welding strength and fume generated in the welding process. There is an advantage that can be prevented.
• the acrylic urethane copolymer resin (A) is a material having excellent corrosion resistance and hydrophobicity, and may be a block copolymer of an acrylic resin and a urethane resin.
• the copolymerization ratio of the block co-polymer may be 40: 60 to 60: 40. If the ratio is
• the block co-polymer is formed through a block co-polymerization reaction of an acrylic resin having a number average molecular weight of 500, 000 to 1, 500, 000 and a urethane resin having a number average molecular weight of 5, 000 to 15,000. Block copolymers.
• melamine may be used as a curing agent
• an ethylene acrylic acid or aziridine-based curing agent may be used as an auxiliary curing agent.
• the non-specific copolymer to prepare a mixture of the urethane resin and the acrylic resin, the mixing ratio of the mixture can be made to match the copolymerization ratio.
• the melamine curing agent may be added 1 to 10 parts by weight, and the auxiliary curing agent may be added to 2 to 15 parts by weight.
• Each addition amount range of the melamine curing agent and the auxiliary curing agent is considered that the block copolymerization reaction occurs unevenly when the lower limit or less, and the stability of the surface treatment composition is lowered by the unreacted material above the upper limit. Subsequently, irradiation with ultraviolet rays or heat leads to block copolymerization reaction, and as a result, the acrylic-urethane copolymer resin (A) can be obtained.
• the Si-Zr-Ti-based organic-inorganic hybrid additive (B) is formed by the reaction of a silicon (Si) -based material, a zirconium (Zr) -based chelating agent, a titanium (Ti) -based chelating agent, and a neutralizing agent. Chelate compounds.
• the silicon (Si) -based material chemically reacts (specifically, chelates) with the zirconium (Zr) -based chelating agent and the titanium (Ti) -based chelating agent to form a compound, and the thickener is Serves to form appropriate conditions for the reaction.
• the silicon (Si) -based material may be one, or two to three kinds of mixtures selected from silicon (Si) -based materials including colloidal silica, silica sol, and silicates.
• Zirconium (Zr) -based chelating agent containing tetraalkyl ziconate may be one, or a mixture of two to three kinds.
• the titanium (Ti) -based chelating agent Hexafluloro Titanic Acid, Fluorotitanic Acid, Titanium Dioxide, Titanium Nitrate, Titanium Sulfate ), Titanium Tetrachloride, Tetrabutoxyt itanium, It may be one, or two to three, selected from titanium (Ti) -based chelating agents, including Hexafluoro Ammonium Titanate, and titanium alkoxide.
• the neutralizing agent may be one or two or three kinds of mixtures selected from amine compounds including isopropyl amine and trimethyl amine.
• a colloidal silica having a particle size of 5 to 50 ⁇ is used as the silicon (Si) -based material, and a nuclear hexatitanic acid (Hexafluloro Titanic Acid) is added thereto as the titanium (Ti) chelating agent.
• the mixture may be prepared by adding tetraalkyl ziconate as the zirconium (Zr) chelating agent.
• the silicon (Si) based material is 40 to 90 weight based on the total amount (100% by weight) of the mixture of the silicon (Si) based material, the titanium (Ti) based chelating agent, and the zirconium (Zr) based chelating agent. %, 5 to 30% by weight of the titanium (Ti) -based chelating agent, and 5 to 30% by weight of the zirconium (Zr) -based chelating agent.
• the surface treatment composition, a coupling (coupling), adhesion promoter, or a mixture thereof; may further include.
• the acrylic-urethane copolymer resin (A) and the Si-Zr-Ti-based organic-inorganic hybrid additive (B) induce a tight bond to play a role of improving the corrosion resistance Can be.
• the coupling agent g- Glycidoxypropyl triethoxy si lane, gamma-aminopropyltrietoxy silane (g-Aminopropyltriet hoxy si lane), Tetraethoxy si lane, methyl trimethoxy si lane, and 3-glycidoxypropyl trimethoxysilane It may be one kind selected from the silane coupling agent (coupling) comprising, or a mixture of two or three or more kinds.
• the adhesion promoter may serve to improve adhesion with the plating layer, for example, may be a phosphate ester, ammonium phosphate, or a mixture thereof.
• the total amount (100 weight%) for the surface treatment composition, each independently, the coupling (coupling) content is 0.5 to 10%, "the amount of the adhesion promoter by weight of a 2 to 20 increment 3 ⁇ 4 Can be. If it is less than the lower limit of the above range, there is no effectiveness, and if it is more than the upper limit, stability of the surface treatment composition may be lowered.
• the coupling agent (coupling agent), gamma-glycidoxypropyl triethoxy silane (g- Glycidoxypropyl triethoxy si lane), gamma-amino propyltriethoxy silane (g- Am inopropyl triethoxy si lane), Silane coupling including tetraethoxy—si lane, methyl trimethoxy si lane, and 3—glycidoxypropyl trimethoxysi me It can be 1 type, or 2 to 3 or more types of mixtures selected from the (coupling) agents.
• adhesion promoter may be a phosphate ester, ammonium phosphate, or a mixture thereof.
• the single-coated steel sheet, the first steel plate 110 and the first plated worm 120 is located on one side of the natural steel sheet,
• the surface treatment layer 130 is disposed on the first plating layer 120 of the single-coated steel sheet, and includes an acrylic-urethane copolymer resin (A) and a Si-Zr-Ti-based organic-inorganic hybrid additive (B). And satisfying the following formula 1 ,
• FIG. 1 schematically illustrates it.
• Equation 1 0.3 ⁇ [A] / ([A] + [B]) ⁇ 0.7
• [A] and [B] are each the total amount of the surface treatment layer (100 Weight 3 ⁇ 4>) means the content of A (increase%) and the content of B (in weight%).
• the surface treatment layer 130 may be formed using the above-described composition for surface treatment. have.
• the mass of the surface treatment layer 130 per side of the single-side coated steel sheet may be 300 to 2500 mg / m 2 .
• the thickness of the surface treatment layer 130 is too thin it may be difficult to secure corrosion resistance
• the thickness of the surface treatment layer 130 is more than 2500 mg / m 2 It may become too thick, weldability may fall, and adhesiveness with respect to the said plating layer may worsen.
• the mass of the first plating layer 120 per one side of the cold rolled steel sheet 5 to
• the thickness of the first plating layer 120 may be too thin to secure corrosion resistance.
• the deposition amount of more than 300 g / m 2 has the disadvantage of poor workability and economic efficiency.
• the low U plating layer 120 may include zinc, a zinc-based alloy, or a combination thereof.
• the zinc-based alloy may be Zn-Ni, Zn-Mg, Zn-Al, or Zn-M-Mg.
• the one-side coated steel sheet further includes a second plating layer (not shown) inevitably present on the other side of the cold-rolled steel sheet, and the mass of the second plated layer (not shown) on one side of the cold rolled steel sheet is 10 mg / m 2 or less, except 0 mg / m 2 .
• the second plating layer may be inevitably formed on the other side, but is not intentionally formed.
• the surface treatment composition includes an acrylic-urethane copolymer resin (A), a Si-Zr-Ti-based organic-inorganic hybrid (hybrid) additive (B), and a solvent, and satisfying the following formulas 1 and 2 ,
• Equation 1 0.3 ⁇ [A] / ([A] + [B]) ⁇ 0.7
• the surface treatment composition used in the surface treatment method of the single-side coated steel sheet may be the same as described above.
• the surface treatment method of the single-side coated steel sheet except for the description that overlaps with those described above. Provide an explanation.
• First, preparing the single-sided coated steel sheet may be performed by using a plating bath in which a current mask is disposed on one side.
• the current mask edge mask
• the current can flow only to the other side.
• electroplating may be induced only on one side of the current flowing.
• the material steel sheet to be plated that is, the cold rolled steel sheet 110
• the material steel sheet and the current shielding device may be damaged.
• the distance is too far, current flows to the edge of the undesired side of the plating, and plating may be performed, resulting in deterioration of welding quality. Therefore, it is necessary to appropriately adjust the position of the material steel plate 110 to be plated in the current shielding device.
• the step of applying the composition for the surface treatment on the crab 1 plating layer 120 of the single-coated steel sheet may be performed by a roll coating method, a spray method, or a deposition method.
• the coating composition for the surface treatment may be applied on the first plating insect 120 of the single-coated steel sheet in a coating amount of 300 to 2500 mg / m 2 . This coating amount considers the above-mentioned content.
• Forming the surface treatment layer 130 may be to be carried out in a temperature range of 130 to 250 ° C.
• the temperature range is based on the steel plate temperature (MT-Metal Temperature).
• Figure 3 is a general view of the surface treatment process of (3) using the one-side plating of (2), and the composition prepared in (1).
• the cold rolled steel pipe 110 is passed through a welder and a leveler, washed with water, and pickled, and then horizontal helical form. Move to the plating bath of to perform the one-side plating of (2).
• an edge mask is positioned at one side of the plating bath, and current may not flow in the corresponding side, and plating may not be performed (Non-Plating).
• plating may not be performed (Non-Plating).
• On-current plating is made (Pl at ing) the first plating layer 120 may be formed.
• some plating may be performed on the side where the edge mask is located, and a second plating layer (not shown) may be formed.
• the strip direction is changed (Str ip reversal), and then is moved to a coater to perform the surface treatment process of (3).
• the composition prepared in the above (1) Only the surface of the first plating layer 120 may be processed.
• the composition prepared in the above (1) by closing (close) the surface on which the first plating layer 120 is located.
• the surface of the surface where the second plating layer (not shown) is located can be opened to prevent the composition prepared in (1) from being applied.
• the composition applied on the first plating layer 120 may be cured to form the surface treatment layer 130. Finally, the surface quality is inspected and obtained as a product. can do.
• acryl-urethane copolymer resin (A), Si-Zr-Ti-based organic-inorganic hybrid additive (B), silane coupling agent, adhesion promoter, and water Were mixed to prepare a surface treatment composition satisfying each composition.
• a plating solution of pure zinc or zinc-based alloy plating composition was used. More specifically, a zinc or zinc-based alloy plating ingot is melted at a concentration of 40 to 120 g / L in a sulfuric acid bath whose temperature is controlled at 40 to 90 ° C. and at a pH of 0.5 to 2.
• the composition for surface treatment of the above (1) was applied to the fuel contact surface of the one-side coated steel sheet of the above (2), followed by baking at 210 0 C, The surface treated single-coated steel sheet was finally obtained.
• the properties of the surface treatment composition of (1) or the surface-treated single-coated steel sheet of (3) were evaluated for the properties of the fuel tank steel sheet. It was. Specifically, the evaluation conditions of each physical property are as follows.
• Solution stability For the composition for surface treatment of (1), 60 days at room temperature and
• Corrosion resistance For the surface-treated single-coated steel sheet of (3) above, after 500 hours at 35 0 C of brine (concentration 5) and lkg / cm 2 spray pressure, the corrosion area based on the following criteria: (% Area of rust generated, based on% of total surface area) ⁇ : When corrosion area is near zero
• Fuel resistance Using the fuel resistance evaluation apparatus of FIG. 2, the fuel resistance for each of the deteriorated gasoline and biodiesel was evaluated under high temperature conditions.
• Weldability Using arc welding machine, arc welding was performed under the condition of current 95A, voltage 15.9 Volt and welding speed 13.5mpm under KC-27 welding wire (diameter 1.2 ⁇ ), atmosphere gas Ar-20% C0 2 The condition, spatter, groove generation, strength, and the like were observed to evaluate the criteria of good weldability (O, non-weldability (X) and poor welding quality (r).
• the plating layer is formed on one surface of the natural signboard so that the adhesion amount of zinc-nickel alloy plating is 30 g / m 2 , and 1000 mg / of the surface treatment composition of Table 1 thereon. m 2 was applied, and the bake hardened under the condition that the steel sheet temperature is 210 ° C. Then, the quality evaluation was carried out according to (4) above and the results are recorded in Table 1. Table 1]
• Example 50 o ⁇ ⁇ Example 70 o ⁇ oo Comparative Example 80 oo ⁇ X Comparative Example 50 0.2 o ⁇ ⁇ o.
• the acrylic-urethane copolymer resin (A) and the Si-Zr-Ti-based organic-inorganic hybrid (hybr id) additive (B) The content satisfies the following equations 1 and 2 simultaneously, the content of the coupling (coupling) agent is 0.5 to 10% by weight, the content of the adhesion promoter must satisfy the 2 to 20 increase 7 ⁇ , all the properties evaluation results excellent You can see.
• Equation 1 0.3 ⁇ [A] / ([A] + [B]) ⁇ 0.7 [Formula 2] 20% increase in weight ⁇ [A] + [B] ⁇ 70% by weight
• a zinc-nickel alloy plating layer is formed on one side of the natural signboard with the adhesion amount of Table 2, and thereon. 1000 mg / m 2 of the surface treatment composition was applied, and the baking was performed under the condition that the steel sheet temperature was 210 ° C. After that
• the plating adhesion amount of the fuel contact surface At 5 to 300 g / m 2 and the coating weight of the coated surface is 10 mg / m 2 or less, it can be seen that all of the physical property evaluation results are excellent.
• the plated layer is formed on one side of the natural signboard so that the adhesion amount of zinc-ni3 ⁇ 4 alloy plating is 30 g / m 2 , and the steel plate temperature shown in Table 3 thereon. And the surface treatment layer was formed on the conditions of adhesion amount. Then, quality evaluation was performed according to (4) above, and the results are recorded in Table 3.
• the surface treatment layer adhesion amount (that is, the coating amount of the surface treatment composition) on the fuel contact surface is 300 to 2500 mg / m 2
• the steel sheet silver is hardened in the temperature range of 130 to 250 ° C In this case, it can be seen that all the physical property evaluation results are excellent.

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• 2015
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