KR19990042001A - Manufacturing method of aluminum galvanized steel sheet in plating bath - Google Patents
Manufacturing method of aluminum galvanized steel sheet in plating bath Download PDFInfo
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- KR19990042001A KR19990042001A KR1019970062698A KR19970062698A KR19990042001A KR 19990042001 A KR19990042001 A KR 19990042001A KR 1019970062698 A KR1019970062698 A KR 1019970062698A KR 19970062698 A KR19970062698 A KR 19970062698A KR 19990042001 A KR19990042001 A KR 19990042001A
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- steel sheet
- plating
- plating bath
- galvanized steel
- component
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- 238000007747 plating Methods 0.000 title claims abstract description 63
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 19
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 229910052782 aluminium Inorganic materials 0.000 title description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title 1
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 39
- 239000010959 steel Substances 0.000 claims abstract description 39
- 239000011701 zinc Substances 0.000 claims abstract description 26
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000004544 sputter deposition Methods 0.000 claims abstract description 14
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 10
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000137 annealing Methods 0.000 claims abstract description 4
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 3
- 230000003213 activating effect Effects 0.000 claims abstract 2
- 238000005246 galvanizing Methods 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 11
- 229910052742 iron Inorganic materials 0.000 abstract description 4
- 239000004566 building material Substances 0.000 abstract description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- 238000009792 diffusion process Methods 0.000 description 13
- 238000005275 alloying Methods 0.000 description 6
- 230000002950 deficient Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 229910001297 Zn alloy Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 229910018084 Al-Fe Inorganic materials 0.000 description 1
- 229910018192 Al—Fe Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910002058 ternary alloy Inorganic materials 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Classifications
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- 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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
-
- 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
- C23C2/04—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
- C23C2/34—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
본 발명은 자동차, 가전 제품, 건축자재에 사용되는 방청용 아연도금강판의 제조 방법에 관한 것으로, 용융아연도금(GI:Galvanized Iron)강판을 제조시나 합금화 용융아연도금(GA:Galvannealed Alloy)강판을 제조시 도금욕중 Al 성분의 조정이 불필요한 용융아연 도금강판의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing galvanized steel sheets for rust prevention used in automobiles, home appliances, and building materials. The present invention relates to galvanized iron (GA) galvanized iron (GA) galvanized steel (GA). The present invention relates to a method for producing a hot-dip galvanized steel sheet, which requires no adjustment of the Al component in the plating bath.
본 발명의 용융아연 도금강판의 제조 방법은, 강판을 소둔처리하고 활성화처리한 다음, 소지강판에 스퍼터링에 의해 10㎚∼1㎛ 두께로 Al및 Al 합금을 정밀하게 도금하여 도금층을 형성하고, 그후 Al 성분이 함유되지 않은 용융아연 도금욕에 Al이 도금된 소지 강판을 침지하여 아연도금을 실시하여 도금욕중 Al 성분 조성을 변경할 필요가 없도록 한 것을 특징적인 기술요지로 한다.In the method for producing a hot-dip galvanized steel sheet of the present invention, after annealing and activating the steel sheet, the plated layer is formed by precisely plating Al and Al alloys with a thickness of 10 nm to 1 μm by sputtering on the base steel sheet, and then forming a plating layer. The characteristic technical feature of the present invention is that it is not necessary to change the Al component composition in the plating bath by immersing a steel plate coated with Al in a molten zinc plating bath containing no Al component.
Description
본 발명은 자동차, 가전 제품, 건축자재에 사용되는 방청용 아연도금강판의 제조 방법에 관한 것으로, 보다 상세하게는 용융아연도금(GI:Galvanized Iron)강판을 제조시나 합금화 용융아연도금(GA:Galvannealed Alloy)강판을 제조시 도금욕중 Al 성분 조성의 조정이 불필요한 용융아연 도금강판의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing galvanized steel sheets for rust prevention used in automobiles, home appliances, and building materials. More specifically, the present invention relates to galvanized iron (GI) galvanized steel (GA) galvannealed (GA). The present invention relates to a method for manufacturing a hot-dip galvanized steel sheet, which does not require adjustment of the Al component composition in a plating bath.
용융아연 도금강판의 제조방법으로서 센지미어 방식으로 도금하는 것이 일반적으로 시행되고 있는데 높은 온도의 수소환원 분위기에서 도금처리를 실시함으로써 강판 표면의 산화피막을 환원하고 표면을 활성화시킨다. 즉, 강판을 용융아연 도금욕에 침적하여 수초간 통과시킨 다음 각종 가스노즐을 이용하여 도금 부착량을 조정하여 용융아연도금(GI)강판을 제조하며, 추가로 450∼600℃에서 수초간 가열하여 Fe/Zn 확산 반응을 일으켜 Fe-Zn 합금으로 이루어진 도금층을 형성하여 합금화 용융아연도금(GA) 강판을 제조한다. 이때 도금욕에는 소량의 Al 을 인위적으로 첨가하여 강판이 도금욕에 침적시 아연욕과 강판 사이에 Zn-Fe-Al 3원계 합금층을 생성하게 된다.As a method of manufacturing a hot-dip galvanized steel sheet, it is generally carried out by plating with a sensimilar method. The plating process is performed in a hydrogen reducing atmosphere at a high temperature to reduce the oxide film on the surface of the steel sheet and activate the surface. In other words, the steel sheet is deposited in a molten zinc plating bath and passed through for several seconds, and then a plating zinc coating is adjusted using various gas nozzles to prepare a hot-dip galvanized (GI) steel sheet, which is further heated at 450 to 600 ° C. for several seconds. The alloying hot dip galvanized (GA) steel sheet is manufactured by forming a plating layer made of Fe—Zn alloy by causing a / Zn diffusion reaction. At this time, a small amount of Al is artificially added to the plating bath to generate a Zn-Fe-Al ternary alloy layer between the zinc bath and the steel sheet when the steel sheet is deposited in the plating bath.
첨가된 Al 성분의 역할은 GI 강판의 경우 Fe-Al 합금층을 형성하여 Fe/Zn 확산 반응을 억제하여 양호한 도금부착성을 갖게 하고, GA 강판의 경우 Fe-Al 합금층이 적절히 얇게 형성되어 Zn/Fe 합금화 반응이 이루어지도록 한다. 통상적으로 GI 강판을 생산하는 경우 0.14∼0.20%를 유지하며, GA 강판을 생산하는 경우 0.10∼0.14%를 유지한다. 즉, 강판의 종류에 따라 Al 성분의 조성을 변경해야할 정도로 용융아연도금강판의 제조시에는 Al 성분 조성이 절대적인 역할을 하며 품질에도 매우 민감한 영향을 미친다.The role of the added Al component is to form a Fe-Al alloy layer in the case of the GI steel sheet to suppress the Fe / Zn diffusion reaction to have a good plating adhesion, and in the case of GA steel sheet, the Fe-Al alloy layer is appropriately formed thin Zn Allow the / Fe alloying reaction to occur. In general, when producing GI steel sheet, 0.14 to 0.20% is maintained, and when producing GA steel sheet, 0.10 to 0.14% is maintained. That is, in the manufacture of hot-dip galvanized steel sheet to the extent that the composition of the Al component should be changed according to the type of steel sheet, the Al component composition plays an absolute role and has a very sensitive effect on quality.
또한, 종래와 동등한 품질을 가지면서 생산성을 향상시킨 아연도금강판 제조방법에 관한 종래 기술로 일본 특개평 7-70725호가 있는데, 강판 표면에 먼저 Al 이나 Al 합금을 진공증착 혹은 스프레이 방법으로 0.3g/㎡ 이상 부착후 상층 도금으로 1중량% Al 이하의 용융아연을 도금하는 방법에 관한 것이다.In addition, Japanese Patent Application Laid-open No. Hei 7-70725 discloses a method of manufacturing a galvanized steel sheet having improved quality while improving the productivity, which is equivalent to that of the conventional art. It relates to a method for plating molten zinc of 1% by weight or less by upper layer plating after adhesion over 2 m 2.
따라서, 통상의 아연도금강판 제조 방법인 센지미어 방식의 경우, 도금욕에 Al 성분을 첨가하게 되면 첫째, 도금욕 Al 성분 조성의 변동이 심하고 정밀하게 Al 성분을 조절하는 것이 어려우며, 둘째, 앞에서 설명한 바와같이 GI 강판과 GA 강판을 동일 도금욕에서 생산시 도금욕 성분을 변경하여야 하는데 실공정에서는 도금욕 용량이 크므로 도금욕 성분 변경에 최소 48 시간이 소요되어 장시간이 작업 중단되고 작업이 번거로운 문제가 있다. 또한, Al 성분 조성이 변경되는 중간 조성에서는 도금 품질이 불안정한 문제가 있다.Therefore, in the case of the Sensimere method, which is a conventional galvanized steel sheet manufacturing method, when the Al component is added to the plating bath, first, it is difficult to control the Al component precisely and the variation of the Al component composition of the plating bath is severe. As described above, when the GI steel sheet and the GA steel sheet are produced in the same plating bath, the plating bath components should be changed. In the actual process, the plating bath capacity is large. There is. In addition, there is a problem in that the plating quality is unstable in the intermediate composition in which the Al component composition is changed.
그리고, 상기 일본 특개평 7-70725호의 종래 기술에서는 진공증착이나 스프레이 방법으로 도금을 실시하므로 도금되는 입자가 거칠고 크기 때문에 균일한 도금층을 형성할 수가 없고 도금층 내부에 기공이 많이 포함되므로 Fe/Zn 확산 반응을 억제하기 곤란하고 부착속도가 대단히 높아서 부착 두께를 나노미터(nanometer) 수준으로 정밀하게 제어하는 것이 곤란하여 안정된 품질의 제품을 생산하기 곤란한 문제가 있다.Further, in the prior art of Japanese Patent Application Laid-Open No. 7-70725, since plating is performed by vacuum deposition or spray method, since the particles to be plated are coarse and large, a uniform plating layer cannot be formed and many pores are contained in the plating layer, so that Fe / Zn diffusion. It is difficult to suppress the reaction and the adhesion speed is very high, so that it is difficult to precisely control the adhesion thickness to the nanometer level (nanometer), there is a problem that it is difficult to produce a product of stable quality.
본 발명은 상기 설명한 종래 기술의 문제를 해결하기 위하여 이루어진 것으로, GI 및 GA 강판으로 생산 제품이 변경되더라도 도금욕중 Al 성분 조성을 변경할 필요가 없으며 도금밀착성이 우수하고 도금 외관이 양호한 용융아연 도금 강판 제조 방법을 제공하는데 그 목적이 있다.The present invention is made to solve the problems of the prior art described above, even if the production product is changed to the GI and GA steel sheet, there is no need to change the Al component composition in the plating bath, and the hot-dip galvanized steel sheet having excellent plating adhesion and good plating appearance The purpose is to provide a method.
상기 목적을 달성하기 위한 본 발명의 용융아연 도금강판 제조방법은, Al 성분이나 Al 합금 성분을 도금욕에 투입하지 않고, 매우 정밀하고 치밀한 조직을 가져 Fe/Zn 합금화 반응을 억제하여 도금밀착성을 확보하도록 스퍼터링 방법으로 소지강판에 10㎚∼1㎛ 두께로 Al을 도금하며, 그후 Al 성분이 함유되지 않은 용융아연 도금욕에서 Al이 부착된 소지 강판을 도금함으로써 GI 및 GA 강판으로 생산 제품이 변경되더라도 도금욕중 Al 성분 조성을 변경할 필요가 없도록 한 것을 특징으로 하는 구성이다.In order to achieve the above object, the hot-dip galvanized steel sheet manufacturing method of the present invention has a very precise and dense structure without adding an Al component or an Al alloy component to the plating bath, thereby suppressing the Fe / Zn alloying reaction to secure plating adhesion. Al is plated with 10nm ~ 1㎛ thickness on the base steel sheet by sputtering method, and then plated the base steel plate with Al in the molten zinc plating bath containing no Al component so that even if the product is changed to GI and GA steel plate The composition is characterized in that it is not necessary to change the Al component composition in the plating bath.
이하에서는 양호한 실시예와 관련하여 본 발명을 상세하게 설명한다.Hereinafter, the present invention will be described in detail with reference to the preferred embodiments.
본 발명에서는 우선 통상의 용융아연 도금강판의 처리와 같이 소지강판을 소둔 및 활성화처리한다.In the present invention, firstly, the base steel sheet is annealed and activated as in the conventional hot dip galvanized steel sheet.
이어서, 도금욕에 침적하기 전에 스퍼터링 방법으로 소지강판의 표면에 10㎚∼1㎛ 두께로 Al을 도금하는데, 이때 사용되는 스퍼터링 장치는 일반적으로 사용되는 구조의 것이나, 약 1∼10-5torr의 진공을 진공챔버에 형성할 수 있도록 진공 배기장치를 구비하여야 하며, 진공챔버 내부에는 소지강판을 도금할 Al 이나 Al합금으로 된 타겟(target)이 구비된다. 이러한 스퍼터링 장치에 의해 Al 이나 Al 합금을 극히 얇은 치밀한 조직으로 부착하는데, 그 두께는 상술한 바와 같이 10㎚∼1㎛ 두께이다. 상기 범위의 경우 Fe/Zn 확산 반응의 억제 효과를 극대화할 수 있으나,이 범위외의 경우 도금 조직이 치밀하지 못하고 기공이 생성되어 Fe/Zn 확산반응이 기공을 통해 급속하게 진행되어 아웃버스트(Outburst) 조직을 일으킬 수 있다. 도금 두께는 도금 종류, 통판속도 및 합금화 온도에 따라 달라지며, Fe-Zn 합금화 반응을 억제하기 위해 요구되는 최소 두께가 10nm 이며, 1㎛ 이상 과도하게 Al 이나 Al 합금이 도금되면 Fe/Zn 확산 반응은 충분히 억제하나 도금된 Al 이나 Al 합금층이 Fe 와 반응하여 일부만 Fe-Al 합금층을 형성하여 Fe/Zn 확산 반응을 억제하고 나머지는 그대로 잔류하여 더이상 유용하지 않다.Subsequently, Al is plated on the surface of the steel sheet by a sputtering method prior to being deposited in the plating bath in a thickness of 10 nm to 1 μm. The sputtering apparatus used is generally of a structure used, but has a thickness of about 1 to 10 −5 torr. A vacuum exhaust device should be provided to form a vacuum in the vacuum chamber, and a target made of Al or Al alloy to plate the steel sheet is provided inside the vacuum chamber. Such sputtering apparatus attaches Al or Al alloy to an extremely thin and dense structure, and the thickness thereof is 10 nm to 1 μm as described above. In the above range, it is possible to maximize the suppression effect of the Fe / Zn diffusion reaction, but outside this range, the plating structure is not dense and pores are generated, the Fe / Zn diffusion reaction proceeds rapidly through the pores outburst (Outburst) May cause tissue. The plating thickness depends on the plating type, plate speed, and alloying temperature. The minimum thickness required to suppress the Fe-Zn alloying reaction is 10 nm, and the Fe / Zn diffusion reaction occurs when Al or Al alloy is plated excessively over 1 μm. Silver is sufficiently inhibited, but the Al or Al alloy layer plated reacts with Fe to form only a Fe-Al alloy layer to suppress the Fe / Zn diffusion reaction and the remainder is not useful anymore.
상술한 바와 같이 도금욕에 침적하기 전에 소지강판에 Al 이나 Al 합금의 도금층을 스퍼터링에 의해 부착하는 것은 다음과 같은 이유에서 이다.As described above, the deposition layer of Al or Al alloy on the base steel sheet by sputtering before deposition in the plating bath is for the following reason.
통상의 용융아연 도금욕에는 Al 성분이 포함되어 있고 소지강판을 도금욕에 침적하여 도금시 강판과 Al의 친화력이 강해 우선 Fe-Al 화합물층이 형성되는데, 이 화합물층은 매우 치밀하여 Fe 와 Zn 의 확산을 억제하는 역할을 수행하여 결국 용융아연 도금강판의 도금밀착성을 확보시키는데 주된 역할을 한다. 그러나, GA는 아연도금층이 Fe/Zn의 확산반응으로 인하여 합금화된 강판으로써 이경우 Fe-Al합금층이 과도하게 치밀하고 두꺼우면 Fe-Zn 확산반응이 억제되어 GA 강판을 제조할 수 없거나 혹은 Fe-Al 합금층을 극복하고 GA 강판을 제조하기 위해 높은 온도로 가열하여야 하나, 이와같이 제조된 제품은 표면이 거칠고 파우더링성등이 열악화된다. 따라서, Al 성분 조성을 통상 0.10∼0.14%의 약간 낮은 수준에서 도금하여 적절하게 Fe-Zn 합금화 반응이 일어나게 하고 표면 물성도 확보한다.따라서, GI 및 GA 강판등 종류에 따라 도금욕중 Al 성분 조성을 달리해야 하나, Fe-Zn 합금층의 두께에 따라 확산 반응의 억제 정도가 달라지게 되므로 정밀하게 도금 두께를 제어할 수 있는 스퍼터링 방법으로 사전에 Al 도금을 실시하여 Al-Fe 합금층의 두께를 정밀하게 제어하여 Fe/Zn 확산반응을 억제하도록 한 것이다.Conventional hot dip galvanizing bath contains Al and deposits the base steel plate in the plating bath so that the affinity between the steel sheet and Al is strong at the time of plating, and the Fe-Al compound layer is formed first. This compound layer is very dense and diffuses Fe and Zn. By performing the role of suppressing the ultimately plays a major role in securing the plating adhesion of the hot-dip galvanized steel sheet. However, GA is galvanized steel plate due to the diffusion reaction of Fe / Zn. In this case, if the Fe-Al alloy layer is excessively dense and thick, Fe-Zn diffusion reaction is suppressed and GA steel sheet cannot be manufactured or Fe- In order to overcome the Al alloy layer and to produce a GA steel sheet, it must be heated to a high temperature, but the product thus manufactured has a rough surface and poor powdering properties. Therefore, the Al component composition is usually plated at a slightly lower level of 0.10 to 0.14% to allow Fe-Zn alloying reaction to occur appropriately and to secure surface properties. Therefore, the composition of the Al component in the plating bath varies depending on the type of GI and GA steel sheets. However, since the degree of suppression of the diffusion reaction varies depending on the thickness of the Fe-Zn alloy layer, Al plating is performed in advance by sputtering to control the plating thickness precisely, thereby precisely adjusting the thickness of the Al-Fe alloy layer. By controlling the Fe / Zn diffusion reaction.
스퍼터링 장치는 플라즈마를 형성하여 매우 미량의 타겟 금속을 음극 기판에 도금하는 것으로 플라즈마 형성에는 약 1∼10-5torr의 진공도가 필요하며 도금속도는 기판 금속의 종류 및 진공도 등의 여러 인자에 의해 영향을 받으므로 적정 조건으로 시행된다. 그러나 매우 정밀한 두께로 제어하기 위해서는 스퍼터링 속도를 낮추어야 하며, 실제 제조에 있어서는 스퍼터링 장치를 다수 설치하여 강판 등판 속도 및 도금 두께에 대응할 필요가 있다.The sputtering apparatus forms a plasma to plate a very small amount of target metal on a cathode substrate. The plasma formation requires a vacuum degree of about 1 to 10 -5 torr, and the plating speed is influenced by various factors such as the type and the degree of vacuum of the substrate metal. It is conducted under appropriate conditions. However, in order to control the thickness very precisely, the sputtering speed must be lowered, and in actual manufacture, it is necessary to install a plurality of sputtering apparatuses to correspond to the steel plate climbing speed and the plating thickness.
상기 설명한 바와 같이 스퍼터링에 의해 소지강판에 Al 이나 Al 합금 도금을 실시한후 도금된 강판을 도금욕에 침적하여 아연도금을 실시하는데, 용융아연 도금욕은 Al 성분 조성의 변동 없이 GI 및 GA 강판을 공용으로 생산할 수 있는 것으로 Fe/Zn 확산 반응을 억제할 필요가 없기 때문에 도금욕중에 Al 성분을 첨가할 필요가 없고 도금욕에서 Al의 성분 조정이 어려우므로 첨가하지 않는 것을 원칙으로 하고, 다만 불순물로 Al이 존재할 수 있는데 0.01% 이하 존재한다.As described above, after the Al or Al alloy plating is performed on the base steel sheet by sputtering, the plated steel sheet is deposited in a plating bath to perform zinc plating. The hot dip galvanizing bath shares GI and GA steel sheets without any change in Al composition. It is not possible to suppress the Fe / Zn diffusion reaction because it does not need to suppress the Fe / Zn diffusion reaction, and it is not necessary to add Al component in the plating bath and it is difficult to adjust Al component in the plating bath. May be present but less than 0.01%.
이하에서는 실시예와 관련하여 본 발명을 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
실시예Example
두께 0.5㎜, 크기 50×50㎜ 냉연강판을 760℃로 소둔, 활성화처리후 스퍼터링 장치에서 표 1 과 같은 조건으로 Al 이나 Al 합금을 도금한 다음, 0.01% 이하의 Al을 포함하는 용융아연 도금욕에서 90∼110g/㎡ 를 도금한다. 위와같이 준비된 시료를 육안으로 외관 관찰하고 OT 굴곡시험→테이프 박리시험의 과정으로 밀착성을 평가하였다. 도금외관은 통상의 용융아연 도금강판의 표면과 동등한 정도를 양호한 것으로 평가하고, 테이프에 아연 도금이 부착하지 않은 상태를 도금 밀착성이 양호한 것으로 평가하였다.After annealing and annealing the cold rolled steel sheet at a thickness of 0.5mm and a size of 50 × 50mm at 760 ℃, and plating the Al or Al alloy under the conditions shown in Table 1 in the sputtering apparatus after activation treatment, the hot-dip galvanizing bath containing Al of 0.01% or less At 90-110 g / m2. The sample prepared as described above was visually observed and the adhesion was evaluated by the process of OT bending test to tape peeling test. The plating appearance evaluated the grade equivalent to the surface of a normal hot-dip galvanized steel sheet as favorable, and evaluated the plating adhesiveness as the state in which the zinc plating did not adhere to the tape.
상기 표 1 로부터 알 수 있는 바와 같이 본 발명에 의한 경우 도금 외관 및 도금 밀착성이 모두 양호한 것으로 나타났다.As can be seen from Table 1, both the appearance and plating adhesion of the present invention were found to be good.
따라서, 상기 설명한 바와 같이 본 발명에 의하면, 용융아연도금(GI)강판이나 합금화 용융아연 도금(GA) 강판의 강판 종류에 불문하고 용융아연 도금욕을 동일한 것으로 사용하며 도금욕중의 Al 성분을 조정할 필요가 없어 품질 향상은 물론 제조 비용 절감과 생산성 향상의 효과를 얻을 수 있다.Therefore, as described above, according to the present invention, regardless of the type of steel sheet of the hot dip galvanized (GI) steel sheet or alloyed hot dip galvanized (GA) steel sheet, the hot dip galvanizing bath is used as the same, and the Al component in the plating bath is adjusted. This eliminates the need for quality improvements, as well as lower manufacturing costs and productivity.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH05320946A (en) * | 1992-05-26 | 1993-12-07 | Sumitomo Metal Ind Ltd | Manufacture of alloyed galvanized steel sheet and galvannealed steel sheet |
| JPH07243012A (en) * | 1994-03-07 | 1995-09-19 | Nippon Steel Corp | Production of galvannealed steel sheet excellent in external appearance of surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05320946A (en) * | 1992-05-26 | 1993-12-07 | Sumitomo Metal Ind Ltd | Manufacture of alloyed galvanized steel sheet and galvannealed steel sheet |
| JPH07243012A (en) * | 1994-03-07 | 1995-09-19 | Nippon Steel Corp | Production of galvannealed steel sheet excellent in external appearance of surface |
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