KR20020045215A - A method for manufacturing high strength galvannealed steel sheet with good coating adhesion - Google Patents
A method for manufacturing high strength galvannealed steel sheet with good coating adhesion Download PDFInfo
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- KR20020045215A KR20020045215A KR1020000074586A KR20000074586A KR20020045215A KR 20020045215 A KR20020045215 A KR 20020045215A KR 1020000074586 A KR1020000074586 A KR 1020000074586A KR 20000074586 A KR20000074586 A KR 20000074586A KR 20020045215 A KR20020045215 A KR 20020045215A
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- steel sheet
- plating
- nickel
- rolled steel
- cold rolled
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title abstract description 18
- 229910000831 Steel Inorganic materials 0.000 title abstract description 15
- 239000010959 steel Substances 0.000 title abstract description 15
- 239000011248 coating agent Substances 0.000 title abstract description 4
- 238000000576 coating method Methods 0.000 title abstract description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000007747 plating Methods 0.000 claims abstract description 48
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 31
- 239000010960 cold rolled steel Substances 0.000 claims abstract description 22
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 12
- 239000008397 galvanized steel Substances 0.000 claims description 12
- 238000005246 galvanizing Methods 0.000 claims description 6
- 238000000151 deposition Methods 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 9
- 239000010410 layer Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 238000007772 electroless plating Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- OHVLMTFVQDZYHP-UHFFFAOYSA-N 1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-2-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound N1N=NC=2CN(CCC=21)C(CN1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)=O OHVLMTFVQDZYHP-UHFFFAOYSA-N 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 2
- 229910018520 Al—Si Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- JVKRKMWZYMKVTQ-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]pyrazol-1-yl]-N-(2-oxo-3H-1,3-benzoxazol-6-yl)acetamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C=1C=NN(C=1)CC(=O)NC1=CC2=C(NC(O2)=O)C=C1 JVKRKMWZYMKVTQ-UHFFFAOYSA-N 0.000 description 1
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000080590 Niso Species 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000009828 non-uniform distribution Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
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
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
-
- 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
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
본 발명은 자동차용으로 사용되는 고장력 용융아연 도금강판 및 그 제조방법에 관한 것으로서, 보다 상세하게는 인장강도가60~100kg/㎟인 고장력강 냉연강판의 고장력 냉연강판에 용융아연도금의 전처리로서 니켈처리를 실시함으로써, 이후 아연도금층의 밀착성을 향상시킬 수 있는 고장력 용융아연 도금강판 및 그 제조방법에 관한 것이다.The present invention relates to a high-strength hot-dip galvanized steel sheet used in automobiles and a method for manufacturing the same, and more particularly, nickel treatment as a pretreatment of hot-dip galvanized steel sheet in high-tension cold-rolled steel sheet of high tensile steel cold rolled steel having a tensile strength of 60 ~ 100kg / ㎜ By performing the above, the present invention relates to a high-strength hot-dip galvanized steel sheet and a method for manufacturing the same which can improve the adhesion of the galvanized layer.
용융아연 도금강판은, 용접성, 도장성, 프레스 가공성 및 내식성이 우수하여 자동차, 가전 및 건자재 용도로 수요가 확대되고 수요 강종도 다양화 및 고급화 되고 있는데, 최근에는 환경측면에서 자동차의 연비향상을 이룰 수 있는 Si, Mn, P등이 첨가된 고장력 용융도금강판의 개발이 절실히 요구 되고 있다.Hot-dip galvanized steel sheet is excellent in weldability, paintability, press workability and corrosion resistance, so the demand for automobiles, home appliances, and building materials is expanding, and demand steel is diversified and advanced. There is an urgent need for the development of high strength hot-dip galvanized steel sheets containing Si, Mn, P, etc., which can be added.
통상 고장력강은 P, Mn 등의 고용강화원소를 이용하여 제조되는데, 가공성 증가에 한계가 있어서, 최근 개발되고 있는 초심가공용 고장력강판의 제조시에는Si, Mn, P등의 난도금성 원소를 모두 첨가하고 있다. 그러나, 상기 난도금성 원소 중 Si는 인장강도와 경도 향상을 위해 제강시 첨가되지만, 그 함량이 0.3wt% 이상인 경우에는 냉연 및 예비도금 열처리시 재분포되어 강판표면으로 확산하고, 용융도금이 진행됨에 따라 Fe이 점진적으로 용해하면 배출되어 버린다. 이와 같이 도금계면의 인접부 액상에 잔류하는 Si는 아연보다 철과의 친화력이 크므로 철-규소화합물 입자를 형성하여 철-아연 금속간 상의 핵생성과 성장거동에 영향을 미친다.Normally, high tensile strength steel is manufactured using solid solution elements such as P and Mn, but there is a limit in increase in workability. have. However, in the non-plating element, Si is added during steelmaking to improve tensile strength and hardness, but when the content is 0.3wt% or more, it is redistributed during cold rolling and preplating heat treatment to diffuse to the surface of steel sheet, and hot dip plating Therefore, when Fe gradually melts, it is discharged. As such, Si remaining in the liquid phase adjacent to the plating interface has a greater affinity for iron than zinc, thereby forming iron-silicon compound particles, which affects nucleation and growth behavior of the iron-zinc metal.
이로 인해, 용융아연 도금공정에서 용융아연과의 도금 젖음성을 크게 저하시켜, 미도금의 문제를 유발하거나 혹은 도금이 되더라도 도금 밀착성을 열화시켜 가공시 도금박리를 유발한다.For this reason, in the hot dip galvanizing process, the plating wettability with the hot dip zinc is greatly reduced, causing unplating problems or deteriorating the plating adhesion even when plated, thereby causing peeling during processing.
상기한 바와 같은 Si 함유강의 도금 부착성 확보를 해결하기 위한 공지기술로는, 직화로에서 과잉의 공기를 투입하여 산화피막을 형성한 후, 환원 분위기의 가열로에서 환원처리를 함으로써 도금성을 향상 시키는 기술이 있기는 하지만, 직화로에서 철산화물 두께를 증가시킨 후, 환원 열처리 하면 순수한 Fe층이 강판 표면에 형성되어 도금박리를 야기할 수 있다. 즉, 직화로에서 철산화물의 두께를 적절히 조절하는 것이 매우 중요한데, 현장 적용성 측면에서 어려움이 많다.As a well-known technique for solving the plating adhesion of the Si-containing steel as described above, an excessive amount of air is added to the direct firing furnace to form an oxide film, and then the plating treatment is performed in a reducing furnace to improve the plating property. Although there is a technique to increase the thickness of the iron oxide in the fired furnace, the reduction heat treatment may form a pure Fe layer on the surface of the steel sheet may cause plating peeling. That is, it is very important to properly control the thickness of the iron oxide in the oven, but there are many difficulties in terms of field applicability.
또 다른 공지기술로서, 용융아연 도금액내의 Al 함량을 증가시키는 방법이 있다. 이 기술에서는, Al청가량을 0.21 ~ 0.25wt까지 증가시켜 소지철과 도금층 계면에 Zn-Fe-Al-Si계 및 Fe-Al-Si계의 합금층 생성량을 증가시키고, 합금원소의 산화층을 환원시키는 효과에 의해, 계면에서 합금원소의 산화피막으로 인한 용융도금 젖음성 저하를 방지하고 있다. 그러나, 도금욕내에서 Al의 함량이 증가하면 도금욕내 상부 드로스 발생량이 증가하고 표면 형태가 불균일하게 되기 때문에, 결국 소지철과 도금층게면서의 불균일 합금화 반응을 증가시키게 된다.Another known technique is to increase the Al content in the molten zinc plating liquid. In this technique, the Al amount is increased from 0.21 to 0.25 wt to increase the amount of Zn-Fe-Al-Si and Fe-Al-Si based alloy layers formed at the interface between the base iron and the plating layer, and the oxide layer of the alloying elements is reduced. Due to the effect of reducing the melt plating wettability due to the oxide film of the alloying element at the interface, it is prevented. However, if the content of Al in the plating bath is increased, the amount of upper dross generated in the plating bath is increased and the surface shape is uneven, thereby increasing the heterogeneous alloying reaction between the base iron and the plating layer crab.
이에, 본 발명의 발명자들은 상기한 종래기술들의 문제점을 해결하기 위해 연구와 실험을 거듭하고 그 결과에 근거하여 본 발명을 제안하게 된 것으로, 본 발명은 강중 Si함량이 0.5~2wt%인 고장력 냉연강판에 용융도금하기전에, 니켈처리를 실시함으로써, 이후 아연도금의 밀착성을 향상시킬 수 있는 고장력 용융아연 도금강판의 제조방법을 제공하는데, 그 목적이 있다.Accordingly, the inventors of the present invention have repeatedly studied and experimented to solve the above problems of the prior art, and proposed the present invention based on the results. The present invention is a high tensile cold rolled steel having a Si content of 0.5 to 2 wt%. It is an object of the present invention to provide a method for producing a high-strength hot-dip galvanized steel sheet which can improve the adhesion of zinc plating by performing nickel treatment before hot-dip plating the steel sheet.
상기한 목적을 달성하기 위한 본 발명은,The present invention for achieving the above object,
Si이 0.5~2wt% 함유된 고장력 냉연강판을0.5 ~ 5g/l의 Ni2+를 함유하는 도금액에서 3~10초간 유지하여 니켈처리한 다음, 용융아연도금을 실시하는 것을 특징으로 하는 도금 밀착성이 우수한 고장력 용융아연 도금강판의 제조방법에 관한 것이다.The high adhesion cold-rolled steel sheet containing 0.5 to 2 wt% of Si was held in a plating solution containing 0.5 to 5 g / l of Ni 2+ for 3 to 10 seconds, followed by nickel treatment, followed by hot dip galvanizing. It relates to a method for producing an excellent high tensile hot dip galvanized steel sheet.
또한, 상기한 본 발명의 니켈처리는, 니켈의 부착량이5 ~ 40mg/㎡이 되도록 행하는 것을 특징으로 한다.The nickel treatment of the present invention described above is performed so that the deposition amount of nickel is 5 to 40 mg / m 2.
이하, 본 발명에 대하여 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated.
일반적으로 용융아연 도금강판은, 냉연강판을 탈지하고 열처리한 다음 도금욕조에 장입하여 제조되는데, 본 발명에서는 상기 탈지된 냉연강판을 열처리하여 도금욕조에 장입하기 전에, 강판표면의 니켈 부착량이 5~40mg/㎡으로 되도록 니켈처리를 실시하는데 특징이 있다. 즉, 상기한 바와 같이, 냉연강판 표면에 니켈이 소량 부착되도록 니켈처리를 실시하면, 니켈과 철이 불균일한 분포를 이루는 상태로 되어 강판표면에는 니켈과 철간의 전위차가 형성된다. 이와 같이, 강판표면이 전기적으로 불균일한 상태가 되면, 도금시 도금 젖음성 및 부착성을 향상되는 것이다In general, the hot-dip galvanized steel sheet is prepared by degreasing and heat-treating the cold-rolled steel sheet and then charging it into a plating bath. In the present invention, before the heat-treated degreasing cold-rolled steel sheet is charged into the plating bath, the nickel adhesion amount on the surface of the steel sheet is 5 to 5 ~. It is characterized by performing nickel treatment to be 40 mg / m 2. That is, as described above, when the nickel treatment is performed so that a small amount of nickel adheres to the surface of the cold rolled steel sheet, nickel and iron are in a non-uniform distribution, and a potential difference between nickel and iron is formed on the surface of the steel sheet. As such, when the surface of the steel sheet is electrically uneven, the plating wettability and adhesion during plating are improved.
이하, 본 발명의 니켈처리에 대하여 보다 상세히 설명한다.Hereinafter, the nickel treatment of the present invention will be described in more detail.
상기한 바와 같이, 용융아연도금의 전처리로서 행해지는 본 발명의 니켈처리는, 0.5~5g/ℓ의 Ni2+를 함유하는 도금액에서 3~10초 동안 행해지는 것이 바람직하다. 그 이유는, 상기 니켈 도금액의 Ni2+농도가 0.5g/ℓ미만이면 피복되는 니켈의 양이 너무 적어 젖음성 향상의 효과를 얻을 수 없고, 5g/ℓ이상이면 필요 이상의 농도 유지로 인하여 제조비가 상승하는 문제가 있기 때문이다. 또한, 상기 도금액에서의 유지시간이 3초 미만이면 반응시간이 너무 짧아 니켈이 냉연강판 표면에 충분히 석출되지 못하게 되고, 10초 이상인 경우에는 니켈 석출량이 많아 냉연강판 표면을 완전히 피복시켜 버려서, 강판표면의 전기적 불균일이 형성되지 않아 도금젖음성 향상 효과가 발생하지 않게 된다.As described above, the nickel treatment of the present invention, which is performed as a pretreatment of hot dip galvanizing, is preferably performed for 3 to 10 seconds in a plating solution containing 0.5 to 5 g / L of Ni 2+ . The reason is that if the Ni 2+ concentration of the nickel plating solution is less than 0.5 g / l, the amount of nickel to be coated is too small to obtain the effect of improving wettability. This is because there is a problem. In addition, if the holding time in the plating liquid is less than 3 seconds, the reaction time is too short to prevent the nickel from sufficiently depositing on the surface of the cold rolled steel sheet. When the holding time is 10 seconds or more, the amount of nickel precipitates is large enough to completely cover the surface of the cold rolled steel sheet, thereby The electrical non-uniformity of is not formed, the plating wettability improvement effect does not occur.
즉, 상기한 니켈처리후 냉연강판 표면에는 적절한 양의 니켈이 석출되어 부착되어 있어야 하는데, 그 부착량은 강판표면에 니켈과 철이 적당하게 분포되어 전기적 불균일이 일어날 수 있는 양인 5~40mg/㎡으로 설정하는 것이 바람직하다.That is, after the nickel treatment, the surface of the cold rolled steel sheet should have an appropriate amount of nickel deposited and attached thereto. It is desirable to.
여기서, 상기 냉연강판에 니켈을 피복하는 방법으로는, 전기도금법, 진공증착법, 무전해도금법 등이 적용될 수 있고, 보다 바람직하게는 무전해 도금법을 이용하는 것이다. 상기 무전해 도금법은 설치가 용이하여 경제성이 있고, 용액관리 측면에서도 유리하다.Here, as a method of coating nickel on the cold rolled steel sheet, an electroplating method, a vacuum deposition method, an electroless plating method, or the like may be applied, and more preferably, an electroless plating method is used. The electroless plating method is easy to install and economical, and is advantageous in terms of solution management.
한편, 본 발명에 적용되는 냉연강판은, 강중 0.5~2.0wt% 의 Si을 함유하는 것이 바람직하고, 이외의 성분들은 통상의 저탄소 냉연강판과 동일하게 할 수 있다.On the other hand, it is preferable that the cold rolled steel sheet applied to this invention contains 0.5-2.0 wt% of Si in steel, and other components can be made the same as a normal low carbon cold rolled steel sheet.
상기한 바와 같이, 니켈처리된 냉연강판을 열처리한 다음, 용융아연도금을 실시하는데, 이때 적용되는 도금액 및 도금방법은 통상의 것을 이용할 수 있다. 특히, 도금액의 성분중 Al은 함급화 반응에 직접적으로 관여하여 GA재의 주요품질 특성인 파우더링성과 표면형상에 영향을 미치기 때문에, 도금밀착성 확보 및 드로스 관리 측면에서, 그 함량을 0.15~0.20wt%로 관리하는 것이 바람직하다.As described above, the nickel-treated cold rolled steel sheet is subjected to heat treatment, followed by hot dip galvanizing, and the plating solution and plating method applied at this time may be conventionally used. Particularly, Al in the plating liquid component is directly involved in the quenching reaction and affects the powdering property and surface shape, which are the main quality characteristics of GA materials. It is desirable to manage in%.
이하, 실시예를 통하여 본 발명을 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
(실시예)(Example)
강중 Si의 함량이 하기 표 1과 같은, 0.8mm 두께의 고장력 냉연강판을 이용하여 니켈처리를 실시하였다. 상기 니켈처리는, 도금조건은 하기 표 1과 같이 변화시켰는데, Ni2+이온농도는 NiSO4·4H2O를 이용하여 조정하였고, 도금욕 온도는 상온으로 하여 무전해 도금하였다.The content of Si in the steel was subjected to nickel treatment using a high tensile cold rolled steel sheet having a thickness of 0.8 mm, as shown in Table 1 below. The nickel treatment, the plating conditions were changed as shown in Table 1 below, Ni 2+ ion concentration was adjusted using NiSO 4 · 4H 2 O, plating bath temperature was electroless plated at room temperature.
그 후, 연속용융 도금공정에서 0.15wt% Al 도금욕에 3초간 침적하고, 도금 부착량을 단면 기준으로 50g/㎡으로 하여, 고장력 용융아연 도금강판으로 제조하였다.Then, it was immersed in 0.15 wt% Al plating bath for 3 seconds in a continuous hot-dip plating process, and the plating adhesion amount was 50 g / m <2> based on the cross section, and it was produced as the high tension hot-dip galvanized steel sheet.
이와 같이 하여 제조된 고장력 용융아연 도금강판에 대하여 도금 부착성을 평가하고, 그 결과를 하기 표1에 나타내었다. 여기서, 도금층의 밀착성은, 180°굽힘시험후 가공부의 도금 박리량을 측정하는 것으로 평가하였는데, 그 평가기준은 다음과 같다.The high adhesion hot-dip galvanized steel sheet thus produced was evaluated for the plating adhesion, and the results are shown in Table 1 below. Here, the adhesiveness of the plating layer was evaluated by measuring the plating peeling amount of the machined part after the 180 ° bending test, and the evaluation criteria are as follows.
1: 양호, 2: 보통, 3: 불량1: good, 2: normal, 3: poor
상기 표 1에 나타난 바와 같이, 본 발명의 범위를 만족하는 발명예(1)~(8)의 경우에는 도금밀착성이 우수한 것을 알 수 있다.As shown in Table 1, in the case of Inventive Examples (1) to (8) satisfying the scope of the present invention, it can be seen that the plating adhesion is excellent.
반면에, 니켈처리가 실시되지 않은 비교예(1),(2)는 도금 밀착성이 열위하였고, 비교예(3),(4)의 경우에는 충분한 니켈도금이 이루어 지지 않아 도금 밀착성의 효과가 나타나지 않았다. 또한, 비교예(5),(6)는 밀착성 향상 효과가 약간 나타나기는 하였으나, 필요이상의 농도유지와 처리시간으로 용액제조비 상승의 문제가 있었다.On the other hand, Comparative Examples (1) and (2), which were not subjected to nickel treatment, were inferior in plating adhesion. In Comparative Examples (3) and (4), sufficient nickel plating was not performed, resulting in the effect of plating adhesion. Did. In addition, Comparative Examples (5) and (6), although the adhesion improvement effect slightly appeared, there was a problem of increasing the solution manufacturing cost due to maintaining the concentration and processing time more than necessary.
상술한 바와 같은 본 발명에 의하면, 고장력 냉연강판에 용융도금하기 전에 니켈처리를 추가로 실시함으로써, 도금층의 밀착성을 확보할 수 있고, 이에 따라 환경측면에서 자동차의 연비향상을 이룰 수 있는 고장력 용융도금강판으로 적용할 수 있는 효과가 있는 것이다.According to the present invention as described above, by further performing nickel treatment before hot-dip galvanizing high tensile cold-rolled steel sheet, it is possible to ensure the adhesion of the coating layer, thereby high-tension hot-melt plating that can improve the fuel efficiency of the vehicle in terms of environment There is an effect that can be applied to the steel sheet.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04147954A (en) * | 1990-10-09 | 1992-05-21 | Nippon Steel Corp | Production of hot-dip galvanized steel sheet |
| JPH04333551A (en) * | 1991-05-08 | 1992-11-20 | Nippon Steel Corp | Production of hot dip galvanized steel sheet by preliminary ni plating |
| JPH0525600A (en) * | 1991-07-17 | 1993-02-02 | Nippon Steel Corp | Manufacture of hot dip galvanized steel sheet by pre-ni alloy plating and alloying method |
| JPH06220657A (en) * | 1993-01-28 | 1994-08-09 | Kawasaki Steel Corp | Production of surface treated steel sheet having excellent coating film adhesion |
| JPH0860323A (en) * | 1994-08-19 | 1996-03-05 | Nippon Steel Corp | Production of hot dip galvanized steel plate |
-
2000
- 2000-12-08 KR KR1020000074586A patent/KR20020045215A/en not_active Application Discontinuation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04147954A (en) * | 1990-10-09 | 1992-05-21 | Nippon Steel Corp | Production of hot-dip galvanized steel sheet |
| JPH04333551A (en) * | 1991-05-08 | 1992-11-20 | Nippon Steel Corp | Production of hot dip galvanized steel sheet by preliminary ni plating |
| JPH0525600A (en) * | 1991-07-17 | 1993-02-02 | Nippon Steel Corp | Manufacture of hot dip galvanized steel sheet by pre-ni alloy plating and alloying method |
| JPH06220657A (en) * | 1993-01-28 | 1994-08-09 | Kawasaki Steel Corp | Production of surface treated steel sheet having excellent coating film adhesion |
| JPH0860323A (en) * | 1994-08-19 | 1996-03-05 | Nippon Steel Corp | Production of hot dip galvanized steel plate |
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