KR0135326B1 - Pb-sn alloy coated steel sheet - Google Patents
Pb-sn alloy coated steel sheetInfo
- Publication number
- KR0135326B1 KR0135326B1 KR1019950010136A KR19950010136A KR0135326B1 KR 0135326 B1 KR0135326 B1 KR 0135326B1 KR 1019950010136 A KR1019950010136 A KR 1019950010136A KR 19950010136 A KR19950010136 A KR 19950010136A KR 0135326 B1 KR0135326 B1 KR 0135326B1
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- South Korea
- Prior art keywords
- steel sheet
- plating layer
- alloy
- layer
- plated
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Classifications
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- 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
- C25D5/10—Electroplating with more than one layer of the same or of different metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C11/00—Alloys based on lead
- C22C11/06—Alloys based on lead with tin as the next major constituent
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- 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
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Electroplating Methods And Accessories (AREA)
- Coating With Molten Metal (AREA)
Abstract
본 발명은 내식성 및 내연료성이 우수한 Pb-Sn합금 도금강판에 관한 것으로서, 가공시 윤활성, 용접성, 납땜성을 유지하면서 Pb-Sn합금 도금층에 존재하는 기공부의 부식을 억제시켜 내식성, 가솔린 및 알콜혼합연료에 대한 우수한 내연료성을 갖는 강판을 경제적으로 제조할 수 있게 하는데 그 목적이 있다.The present invention relates to a Pb-Sn alloy plated steel sheet excellent in corrosion resistance and fuel resistance, and suppresses corrosion of pores in the Pb-Sn alloy plating layer while maintaining lubricity, weldability, and solderability during processing. It is an object of the present invention to economically manufacture a steel sheet having excellent fuel resistance against alcohol mixed fuel.
본 발명은 상기 목적을 실현하기 위하여 강판의 표면에 도금되는 도금층을 하층의 Pb-Sn합금 도금층과 상층의 Pb-Sn합금 도금으로 된 이층도금층으로 형성하되, 상기 하층의 Pb-Sn합금 도금층은 중량퍼센트로 2∼25% 범위의 Sn을 함유하고 강판면적당 5∼100g/㎡ 범위의 부착량으로 도금되고, 상기 상층의 Pb-Sn합금 도금층은 중량퍼센트로 25∼70% 범위의 Sn이 함유되고 강판면적당 1∼10g/㎡ 범위의 부착량으로 도금됨을 특징으로 한다.In order to achieve the above object, the present invention is to form a plating layer to be plated on the surface of the steel sheet as a two-layer plating layer consisting of a Pb-Sn alloy plating layer of the lower layer and a Pb-Sn alloy plating of the upper layer, the Pb-Sn alloy plating layer of the lower layer It contains Sn in the range of 2 to 25% by weight and is plated in the adhesion amount in the range of 5 to 100 g / m2 per steel plate area, and the upper Pb-Sn alloy plating layer contains Sn in the range of 25 to 70% by weight and It is characterized by being plated with an adhesion amount in the range of 1 to 10 g / m 2.
Description
[발명의 명칭][Name of invention]
내식성 및 내연료성이 우수한 Pb-Sn 합금 도금강판Pb-Sn alloy coated steel sheet with excellent corrosion resistance and fuel resistance
[발명의 상세한 설명]Detailed description of the invention
[산업상의 이용분야][Industrial use]
본 발명은 가솔린이나 알콜계 연료를 저장하는 자동차의 연료탱크용 소재로 사용되는 내식성 및 내연료성이 우수한 Pb-Sn합금 도금강판에 관한 것으로서, 특히 Pb-Sn합금 도금강판의 도금층에 존재하는 미세한 기공(Pin hole)에 의한 소지강판의 부식을 방지하는데 효과적이면서도 윤활성, 가공성, 납땜성, 용접성 및 도장성이 우수한 내식성 및 내부식성이 우수한 Pb-Sn합금 도금강판에 관한 것이다.The present invention relates to a Pb-Sn alloy plated steel sheet excellent in corrosion resistance and fuel resistance, which is used as a fuel tank material for automobiles storing gasoline or alcohol-based fuels, and is particularly present in the plated layer of the Pb-Sn alloy plated steel sheet. The present invention relates to a Pb-Sn alloy plated steel sheet which is effective in preventing corrosion of the base steel sheet by pin holes, and which has excellent corrosion resistance and corrosion resistance with excellent lubricity, processability, solderability, weldability, and paintability.
[종래기술][Private Technology]
자동차의 연료탱크 및 라디에이터(Radiator), 가전제품의 섀시(Chassis) 및 부품 등의 소재는 일반적으로 내식성과 가공성 및 심(Seam)용접성, 그리고 남땜성 등이 우수한 Pb-Sn합금 도금강판이 널리 사용되고 있다.Materials such as fuel tanks and radiators of automobiles, chassis and parts of home appliances generally use Pb-Sn alloy plated steel sheets that are excellent in corrosion resistance, processability, seam weldability, and solderability. have.
이러한 Pb-Sn합금 도금강판은 도금층 자체가 화학적으로 안정하여 소지금속을 부식분위기로 부터 차단하여 보호하는 부식장벽(Barrier)형 방식기능을 나타낸다.The Pb-Sn alloy plated steel sheet exhibits a corrosion barrier (Barrier) type anti-corrosion function that protects the base metal from corrosion by protecting the base metal from being chemically stable.
그러나, Pb-Sn합금 도금강판의 도금층내에 미세한 기공(Pin-hole)이 존재하게 되는 경우 소지금속인 강판이 노출되어 기공부위에서 부식이 발생되고, 시간의 경과에 따라 기공부위에서 부식이 촉진되어 도금강판의 수명을 단축시킨다.However, when the fine hole (Pin-hole) is present in the plated layer of the Pb-Sn alloy plated steel sheet is exposed to the steel sheet, which is a base metal, corrosion occurs in the pore site, and corrosion is accelerated in the pore site over time. Shorten the life of the plated steel sheet.
한편, 자동차 연료로 가솔린(Gasoline), 또는 에탄올 및 메탄올과 같은 알콜계의 연료를 사용하는 경우의 자동차 연료탱크용 소재로서는 기공부에서의 부식에 의한 구멍이 발생하지 않아야 하며, 또한 부유성 부식생성물에 의해 연료순환계통인 필터(Filter)나 캐뷰레이터(Caburator)의 막힘이 없어야 하는 성능이 요구되고 있다.On the other hand, when using gasoline (Gasoline) or alcohol-based fuels such as ethanol and methanol as the vehicle fuel, the material for the vehicle fuel tank should not generate holes due to corrosion in the pores, and also floating corrosion products As a result, the performance that there should be no clogging of a filter or a cabrator that is a fuel circulation system is required.
현재 통상의 자동차 연료탱크용 소재로는 일본국 특허공보 소57-61833 및 미합중국특허 4461679에 나타낸 Pb-Sn합금 용융도금강판이 널리 사용되고 있다.Currently, Pb-Sn alloy hot-dip galvanized steel sheets shown in Japanese Patent Publication No. 57-61833 and US Patent 4461679 are widely used as materials for automotive fuel tanks.
상기 특허의 Pb-Sn합금 용융도금강판은 소지 강판 상에 전기도금에 의해 니켈을 박도금한 후 Pb-Sn합금을 용융도금함으로써, 기공부의 부식억제를 얻고 있으나, Pb-Sn합금 도금층의 주석함량이 10%이하로 낮기 때문에 메탄올(Methanol) 등의 혼합연료에 용해되기 쉬운 특성을 갖는 문제점이 있으며, 설비적으로는 전기도금후 Pb-Sn합금 용융도금을 실시함으로써, 제조원가의 상승 및 설비비용이 증가되는 문제점이 있다.The Pb-Sn alloy hot-dip steel sheet of the above patent obtains the corrosion inhibition of the pores by thin-plating nickel on the steel sheet by electroplating nickel and then hot-plating the Pb-Sn alloy, but the tin of the Pb-Sn alloy plating layer Since the content is less than 10%, there is a problem in that it is easy to be dissolved in mixed fuel such as methanol, and in terms of equipment, it is possible to increase the manufacturing cost and increase the equipment cost by performing the electroplating of Pb-Sn alloy after electroplating. There is an increasing problem.
한편, 일본국 특허공보 소63-19981에서 제안된 전기도금강판에 후크로 메이트 처리를 실시한 강판은 전기화학적으로 철(Fe) 보다 비(卑)한 전위를 갖는 금속인 아연(Zn)의 희생방식 작용에 의한 방식효과를 나타내지만 부식분위기하에서 아연의 용출속도가 크고 부유성의 백색침전물(White-rust)을 생성시켜 연료순환계통인 필터를 막히게 하는 결점이 있다.On the other hand, the steel plate subjected to mate treatment with the electroplated steel sheet proposed in Japanese Patent Publication No. 63-19981 is a sacrificial method of zinc (Zn), which is a metal having a potential that is electrochemically higher than that of iron (Fe). Although it shows the anticorrosive effect by the action, it has the drawback of clogging the filter which is the fuel circulation system by producing the high dissolution rate of zinc and floating white-rust under the corrosion atmosphere.
또한, 일본국 특허공보 평 2-18991에 나타낸 고내식성 연료탱크용 강판은 Pb-Sn합금 도금층 위에 수지(Resin)를 도포한 것으로서, 부식방지에는 매우 효과적이지만 강판 표층부에 형성된 5-20㎛의 두꺼운 수지피복층에 의해 시임(Seam)용접, 점용접 및 납땜성 등의 용접성이 불량한 문제점을 내포하고 있다.In addition, the steel plate for high corrosion resistance fuel tank shown in Japanese Patent Application Laid-open No. Hei 2-18991 is a resin coated on the Pb-Sn alloy plating layer, which is very effective in preventing corrosion, but has a thickness of 5-20 μm formed on the surface layer of the steel sheet. The resin coating layer has problems of poor weldability such as seam welding, spot welding and solderability.
[발명의 요약][Summary of invention]
본 발명은 상기한 바와 같은 종래의 단점을 해소하기 위하여 안출된 것으로서, 본 발명의 목적은 소지강판 표면에 도금되는 Pb-Sn합금의 도금층에 함유된 Sn함량을 조절함으로써, 간단히 기공부에서의 부식을 방지할 수 있는 가솔린 또는 알콜계 연료에 대하여 우수한 내식성 및 내연료성을 보유하며, 연료탱크 제조공정상의 프레스(Press)가공성, 점(Spot)용접 및 시임용접 등의 저항용접성, 납땜성 및 도장성이 우수할 뿐 아니라, 표면외관이 미려한 내부식성 및 내연료성이 우수한 Pb-Sn합금 도금강판을 제공하는데 있다.The present invention has been made in order to solve the above-mentioned disadvantages, the object of the present invention is simply by controlling the Sn content contained in the plated layer of the Pb-Sn alloy to be plated on the surface of the steel sheet, simply by corrosion in the pores It has excellent corrosion resistance and fuel resistance against gasoline or alcohol-based fuels that can be prevented, and it has resistance weldability, solderability and painting such as press workability, spot welding and seam welding in fuel tank manufacturing process. In addition to providing excellent Pb-Sn alloy plated steel sheet having excellent corrosion resistance and fuel resistance with excellent surface appearance.
이를 실현하기 위하여 본 발명은 Pb-Sn합금 도금강판 표면에 도금되는 도금층을 하층의 Pb-Sn합금 도금층과 상층의 Pb-Sn합금 도금층으로 된 이층 도금층으로 형성하되, 상기 하층의 Pb-Sn합금 도금층은 중량퍼센트로 2∼25% 범위의 Sn을 함유하고, 강판편면당 5∼100g/㎡ 범위의 부착량으로 도금되고, 상기 상층의 Pb-Sn합금 도금층은 중량퍼센트로 25∼70% 범위의 Sn이 함유되고, 강판편면당 1∼10g/㎡ 범위의 부착량으로 도금됨을 특징으로 하는 내식성 및 내연료성이 우수한 Pb-Sn합금 도금강판을 제공한다.In order to realize this, the present invention forms a plating layer to be plated on the surface of the Pb-Sn alloy plated steel sheet as a two-layer plating layer consisting of a lower Pb-Sn alloy plating layer and an upper Pb-Sn alloy plating layer, but the lower layer of the Pb-Sn alloy plating layer Silver percent by weight contained Sn in the range of 2 to 25%, plated at an adhesion amount in the range of 5 to 100 g / m2 per sheet steel sheet, and the upper Pb-Sn alloy plating layer contained Sn in the range of 25 to 70% by weight. Provided is a Pb-Sn alloy plated steel sheet which is excellent in corrosion resistance and fuel resistance, characterized in that it is plated at an adhesion amount in the range of 1 to 10 g / m2 per sheet steel sheet.
이하, 본 발명의 구성과 작용에 대해 상세히 설명하면 다음과 같다.Hereinafter, the configuration and operation of the present invention will be described in detail.
상기한 강판 표면에 도금된 하층의 Pb-Sn합금 도금층 중 Sn함량이 2%이하로 함유될 경우 도금층의 내식성 및 저항용접성이 열화되고, Sn함량이 25%를 넘는 경우에는 하층의 내식성이 포화되며, 오히려 주석의 함량을 증가시킴 따라 제조원가를 승시키기 때문에 하층 Pb-Sn합금 도금층에 함유되는 Sn의 함량을 중량퍼센트로 2∼25% 범위로 한정하는 것이 바람직하다.When Sn content of 2% or less of the Pb-Sn alloy plating layer of the lower layer plated on the surface of the steel sheet is deteriorated, corrosion resistance and resistance weldability of the plating layer deteriorate, and when Sn content exceeds 25%, the corrosion resistance of the lower layer is saturated. On the contrary, it is preferable to limit the amount of Sn contained in the lower Pb-Sn alloy plating layer in the range of 2 to 25% by weight, because the production cost is increased by increasing the content of tin.
또, 상기 하층의 Pb-Sn합금 도금층의 도금부착량이 강판편면당 5g/㎡이하에서는 도금부착량이 미소하여 도금층 내에 기공이 증가되어 충분한 내식성을 얻을 수 없으며, 100g/㎡ 이상에서는 내식성의 포화에 따라 불필요한 제조원가의 상승을 초래하기 때문에 하층 Pb-Sn합금 도금층의 부착량을 5∼100g/㎡의 범위로 한정하는 것이 바람직하다.In addition, when the plating deposition amount of the Pb-Sn alloy plating layer of the lower layer is 5g / m2 or less per sheet steel plate, the plating deposition amount is small and the pores are increased in the plating layer, so that sufficient corrosion resistance cannot be obtained. It is preferable to limit the adhesion amount of the lower layer Pb-Sn alloy plating layer to the range of 5-100 g / m <2>, since it will raise unnecessary manufacturing cost.
한편, 상층의 Pb-Sn합금 도금층은 Sn함량이 25%이하로 함유될 경우 에틸알콜 및 메틸알콜 등에 대한 내연료성이 저하되고, 70%를 초과하여 함유될 경우에는 내식성 및 내연료성의 포화에 따라 불필요한 제조원가의 상승을 초래할 뿐 아니라, 오히려 도금밀착성을 저하시켜 가공성이 불량하게 되기 때문에 상층 Pb-Sn합금 도금층에 함유된 Sn함량을 25∼70%의 범위로 한정하는 것이 바람직하다.On the other hand, the upper Pb-Sn alloy plating layer has a lower fuel resistance to ethyl alcohol and methyl alcohol when the Sn content is less than 25%, and when it is contained more than 70%, the corrosion resistance and fuel resistance are saturated. Therefore, it is preferable to limit the Sn content contained in the upper Pb-Sn alloy plating layer in the range of 25 to 70% because it not only causes an unnecessary increase in manufacturing cost but also lowers the plating adhesion and results in poor workability.
또한, 상층의 Pb-Sn합금 도금층의 도금부착량은 강판편면당 1g/㎡이하일 때 상층 도금층의 피막 형성이 불균일하여 충분한 내식성 및 내연료성을 얻을 수 없으며, 10g/㎡이상일 때에는 내식성 및 내연료성의 포화에 따라 불필요한 제조원가의 상승을 초래하기 때문에 강판편면당 1∼10g/㎡의 범위로 부착되게 하는 것이 바람직하다.In addition, the coating amount of the upper Pb-Sn alloy plating layer is 1g / m2 or less per sheet steel, so that the coating of the upper layer is not uniform, so that sufficient corrosion resistance and fuel resistance cannot be obtained, and when it is 10g / m2 or more, corrosion resistance and fuel resistance It is preferable to make it adhere in the range of 1-10 g / m <2> per sheet steel sheet because it will raise unnecessary manufacturing cost with saturation.
한편, 상기한 바와 같은 하층의 Pb-Sn합금 도금층은 공지의 전기도금법 또는 용융도금법에 의해 제조될 수 있으며, 상층의 Pb-Sn합금 도금층은 전기도금법에 의해 제조되는 것이 바람직하다.On the other hand, the Pb-Sn alloy plating layer of the lower layer as described above may be manufactured by a known electroplating method or a hot dip plating method, the upper layer of the Pb-Sn alloy plating layer is preferably prepared by the electroplating method.
또, 상기한 바와 같은 하층 및 상층의 Pb-Sn합금 도금층을 전기도금법에 의해 형성하는 경우에는 냉연강판을 침지 또는 전해탈지, 수세, 산세, 등의 전처리 실시 후 붕불화납-붕불화Sn의 혼합육을 시용하여 얻을 수 있다.In the case of forming the lower and upper Pb-Sn alloy plating layers as described above by the electroplating method, the cold-rolled steel sheet is immersed or subjected to pretreatment such as electrolytic degreasing, water washing, pickling, etc. Can be obtained by applying meat.
즉, 100∼500g/ℓ의 Pb(BF4)2, 10∼200g/ℓ의 Sn(BF4)2, 20∼100g/ℓ의 HBF4, 10∼60g/ℓ의 H3BO3, 및 3∼20g/ℓ의 Hydroqulnone으로 조정되는 도금용액에서 도금액 온도를 20∼60℃, 상대유속 30∼100m/min, 전류밀도가 10∼100A/d㎡의 전제조건하에서 행해짐을 특징으로 한다.That is, 100 to 500 g / l Pb (BF 4 ) 2 , 10 to 200 g / l Sn (BF 4 ) 2 , 20 to 100 g / l HBF 4 , 10 to 60 g / l H 3 BO 3 , and 3 The plating solution adjusted to ˜20 g / l Hydroqulnone is characterized in that the plating solution temperature is 20 to 60 ° C., a relative flow rate of 30 to 100 m / min, and a current density of 10 to 100 A / dm 2.
또한, 용융도금법으로 하층의 Pb-Sn 도금층을 형성하는 경우에는 냉연강판을 전처리한 후 습식프럭스처리(Flux, 40%의 ZnCl2수용액)하고, 목적하는 Sn농도로 조정된 Pb-Sn합금 도금욕 중에 350∼380℃에서 5∼10초간 침지시켜 얻는다.In the case of forming the lower Pb-Sn plating layer by the hot dip plating method, after pretreating the cold rolled steel sheet, the wet flux treatment (Flux, 40% ZnCl 2 solution) is performed, and the Pb-Sn alloy plating bath is adjusted to the desired Sn concentration. It is obtained by immersing at 350-380 degreeC for 5 to 10 second in the process.
이때, 도금부착량은 고압기체 분사법으로 조절한다.At this time, the coating amount is controlled by a high-pressure gas injection method.
이하, 본 발명에 따른 실시예를 상세히 설명한다.Hereinafter, the embodiment according to the present invention will be described in detail.
[실시예]EXAMPLE
본 발명은 우선 냉연강판을 전해탈지 및 산세공정과 같은 전처리 공정을 거쳐 도금을 행하기 위한 냉연강판 표면을 세정한다.The present invention first cleans the surface of a cold rolled steel sheet for plating the cold rolled steel sheet through a pretreatment process such as electrolytic degreasing and pickling processes.
상기 냉연강판의 세정이 완료되면 냉연강판을 Pb-Sn혼합의 붕불산 도금용액에서 전기도금방식에 의해 하층의 Pb-Sn합금 도금층과, 상층의 Pb-Sn합금 도금층으로 된 이층도금층을 형성한다.When the cold rolled steel sheet is cleaned, the cold rolled steel sheet is formed of a Pb-Sn alloy plating layer of the lower layer and an upper layer of Pb-Sn alloy plating layer by an electroplating method in a boric acid plating solution of Pb-Sn mixture.
상기한 이층도금층 중 하층의 Pb-Sn합금의 도금층은 도금층 중의 Sn이 중량%로 0∼30%의 범위내로 함유됨과 아울러, 4∼150g/㎡범위 내의 부착량으로 도금 부착시킨다.Among the above two-layer plating layers, the plating layer of the Pb-Sn alloy of the lower layer contains Sn in the plating layer in the range of 0 to 30% by weight, and is plated and adhered at an adhesion amount in the range of 4 to 150 g / m 2.
또, 상기한 이층도금층을 이루는 상층의 Pb-Sn합금 도금층은 도금층중의 Sn이 중량%로 20∼85%의 범위 내로 함유됨과 아울러, 0∼20g/㎡범위의 부착량으로 도금 부착시킨다.In addition, the upper Pb-Sn alloy plating layer constituting the two-layer plating layer contains Sn in the plating layer in a range of 20 to 85% by weight, and is plated and adhered at an adhesion amount in the range of 0 to 20 g / m 2.
한편, 상기한 바와 같은 본 발명에 의해 제조된 Pb-Sn합금 도금강판을 발명예로 하고, 종래에 의해 제조된 Pb-Sn합금 도금강판을 비교예로 하여 Sn함량 및 도금부착량에 따른 내식성과 가공성 및 납땜성과 내연료성을 표 1에서와 같이 표시한다.On the other hand, Pb-Sn alloy plated steel sheet produced according to the present invention as described above as an invention example, Pb-Sn alloy plated steel sheet prepared by the conventional example as a comparative example, corrosion resistance and workability according to Sn content and plating deposition amount And solderability and fuel resistance as shown in Table 1.
상기 표1에 나타난 바와 같이 발명예 1∼9에서는 도금층의 기공발생을 억제하여 480시간의 염수분무시험에서 양호한 방식성능과, 우수한 내연료성, 그리고 양호한 가공성 및 납땜성을 나타냄을 알 수 있다.As shown in Table 1, Inventive Examples 1 to 9 exhibited good corrosion resistance, excellent fuel resistance, and good workability and solderability in the salt spray test for 480 hours by suppressing the generation of pores in the plating layer.
이에 비해 비교예 1, 3, 4, 6 및 7의 경우 내식성, 납땜성 및 내연료성이 연화되는 문제점이 있으며, 하층, 또는 상층 Pb-Sn합금 도금층의 도금부착량 및 Sn함량이 본 발명의 범위보다 높은 경우의 2, 5, 9에서는 내식성은 양호하지만 가공성이 불량하였으며 경제성 측면에서 불리함을 알 수 있다.On the other hand, in Comparative Examples 1, 3, 4, 6 and 7, there is a problem in that corrosion resistance, solderability and fuel resistance are softened, and the plating adhesion amount and Sn content of the lower or upper Pb-Sn alloy plating layer are within the scope of the present invention. In higher cases 2, 5, and 9, the corrosion resistance is good, but the workability is poor and it is disadvantageous in terms of economic efficiency.
한편, 상기한 내식성은 480시간의 염수분무시험(JIS-Z2371)후 강판 표면에 발생된 적청발생 상황을 10×10mm 크기를 100개의 눈금으로 분할하여 적청이 발생된 눈금을 백분율로 산출하고, 이 백분율에 따라 적청발생율이 5%미만일 때는 ◎로, 적청발생율이 10%미만일 때는 ○로, 적청발생율이 20%미만일때는 △로, 적청발생율이 20%이상일 때는 ×로 표시하였다.On the other hand, the corrosion resistance is calculated by dividing the situation of red blue color generated on the surface of the steel sheet after the salt spray test (JIS-Z2371) of 480 hours by dividing the size of 10 × 10 mm into 100 scales to calculate the scale of red blue According to the percentage, the red blue incidence was less than 5%, ◎, the red blue incidence was less than 10%, and the red blue incidence was less than 20%, and the red blue incidence was greater than 20%.
또한, 가공성은 박판성형시험기를 이용하여 Cup성형시 도금층의 박리정도에 따라 양호 또는 불량으로 평가하였으며, 납땜성은 Pb-Sn 합금도금 강판 표면에 중량%로 60%Pb∼40%Sn인 납땜을 100㎎ 올려놓고 강판의 온도를 상승시켜 강판의 온도가 200℃일 때 납땜의 퍼짐정도를 측정하여 다음과 같이 퍼짐율을 구하였고, 납땜의 퍼짐율이 70%이상일 때는 ◎로, 60%이상일 때는 ○로, 50%이상일 때는 △로, 50%미만일 때는 ×로 표시하였다.In addition, workability was evaluated as good or bad according to the degree of peeling of the plated layer during the cup molding using a thin sheet forming tester, and solderability was 100% by weight of 60% Pb to 40% Sn on the surface of the Pb-Sn alloy plated steel sheet. Place the MG on the steel plate and raise the temperature of the steel plate to determine the spreading rate of the solder when the temperature of the steel sheet is 200 ℃ .The spreading rate was calculated as follows.When the spreading rate of the solder is 70% or more, ◎ In the case of 50% or more, △, and less than 50% are indicated by ×.
(여기에서 D는 60℃에서의 납땜의 높이, H는 200℃에서의 납땜의 높이이다.)(Where D is the height of the solder at 60 ° C. and H is the height of the solder at 200 ° C.)
그리고, 내연료성은 상기 가공성 평가에 이용된 박판성형시험기에 의하여 80mm의 직경, 높이 400mm의 원형컵을 성형한 후 Cup속에 가솔린 70%와 NaCl 수용액 30%로 된 연화가솔린, 또는 가솔린 15%와 특급 메틸알콜 85%로 된 혼합연료 100∼130㎖를 넣고 상온에서 3개월의 침적실험을 실시하고, 평가는 내식성 평가기준과 동일하게 평가하였다.The fuel resistance was formed by forming a round cup of 80 mm in diameter and 400 mm in height by using the sheet forming test machine used for the evaluation of workability, and softening gasoline made of 70% gasoline and 30% NaCl aqueous solution, or 15% gasoline in the cup. 100-130 ml of mixed fuel containing 85% methyl alcohol was added thereto, followed by a 3-month deposition experiment at room temperature, and the evaluation was evaluated in the same manner as the evaluation criteria for corrosion resistance.
[발명의 효과][Effects of the Invention]
상기한 바와 같은 본 발명에 의해 제조된 내식성 및 내연료성이 우수한 Pb-Sn합금 도금강판은 자동차의 연료탱크로 가공 제조시 우수한 윤활성, 용접성, 납땜성을 유지하면서 Pb-Sn합금 도금층에 존재하는 기공부의 부식을 간단한 방법으로 효과적으로 억제시킴으로써, 내식성, 가솔린 및 알콜혼합연료에 대해 우수한 내연료성을 갖는 강판을 경제적으로 제조할 수 있는 이점이 있다.Pb-Sn alloy plated steel sheet excellent in corrosion resistance and fuel resistance produced by the present invention as described above is present in the Pb-Sn alloy plated layer while maintaining excellent lubricity, weldability, and solderability in the process of manufacturing fuel tanks of automobiles. By effectively inhibiting the corrosion of the pores by a simple method, there is an advantage that it is possible to economically produce a steel sheet having excellent fuel resistance to corrosion resistance, gasoline and alcohol mixed fuel.
Claims (1)
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019950010136A KR0135326B1 (en) | 1995-04-27 | 1995-04-27 | Pb-sn alloy coated steel sheet |
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| KR1019950010136A KR0135326B1 (en) | 1995-04-27 | 1995-04-27 | Pb-sn alloy coated steel sheet |
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| KR0135326B1 true KR0135326B1 (en) | 1998-07-01 |
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