KR970043324A - B. Manufacturing method of zinc-chromium alloy electroplated steel sheet with excellent corrosion resistance - Google Patents

B. Manufacturing method of zinc-chromium alloy electroplated steel sheet with excellent corrosion resistance Download PDF

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Publication number
KR970043324A
KR970043324A KR1019950066195A KR19950066195A KR970043324A KR 970043324 A KR970043324 A KR 970043324A KR 1019950066195 A KR1019950066195 A KR 1019950066195A KR 19950066195 A KR19950066195 A KR 19950066195A KR 970043324 A KR970043324 A KR 970043324A
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South Korea
Prior art keywords
zinc
chromium
steel sheet
chromium alloy
corrosion resistance
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KR1019950066195A
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Korean (ko)
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KR100256373B1 (en
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박성국
장래웅
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김종진
포항종합제철 주식회사
신창식
재단법인 산업과학기술연구소
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Priority to KR1019950066195A priority Critical patent/KR100256373B1/en
Publication of KR970043324A publication Critical patent/KR970043324A/en
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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
    • C25D3/565—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of zinc

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Electroplating And Plating Baths Therefor (AREA)

Abstract

본 발명은 도장처리되지 않은 상태로 자동차 및 가전용으로 사용되는 아연-크롬 합금 전기 도금 강판의 제조 방법에 관한 것으로, 아연-크롬 합금의 연속전기도금시 도금용액중의 금속이온 농도 및 전후반 도금조의 전류밀도를 조절하여 도금층의 하층부는 아연-(저농도)크롬의 합금 조성으로, 상층부는내식성이 우수한 아연-(고농도)크롬의 합금 조성으로 구성하므로서, 나 내식성이 우수한 아연-크롬 합금 전기도금 강판을 제조하는 방법을 제공하고자 하는데, 그 목적이 있다.The present invention relates to a method of manufacturing a zinc-chromium alloy electroplated steel sheet used in automobiles and household appliances in an uncoated state, wherein the concentration of metal ions in the plating solution and the front and rear plating baths during the continuous electroplating of zinc-chromium alloys. By adjusting the current density, the lower layer of the plating layer is composed of an alloy composition of zinc- (low concentration) chromium, and the upper layer is composed of an alloy composition of zinc- (high concentration) chromium having excellent corrosion resistance. It is to provide a method for manufacturing, the purpose is.

상기한 목적을 달성하기 위한 본 발명은 강판에 아연-크롬 합금을 연속적으로 전기도금하는 방법에 있어서, 상기 강판상에 크롬석출량이 4.5중량% 이하인 아연-크롬 합금 도금층을 형성하고, 그 위에는 크롬석출량이 4.5중량% 이상인 아연-크롬 합금 도금층을 형성하는 것을 포함하여 이루어지는 나 내식성이 우수한 아연-크롬 합금 도금강판의 제조방법에 관한 것을 그 요지로 한다.In order to achieve the above object, the present invention provides a method for continuously electroplating a zinc-chromium alloy on a steel sheet, wherein a zinc-chromium alloy plating layer having a chromium deposition amount of 4.5% by weight or less is formed on the steel sheet, and chromium deposition is formed thereon. The gist of the present invention relates to a method for producing a zinc-chromium alloy plated steel sheet having excellent corrosion resistance including forming a zinc-chromium alloy plated layer having an amount of 4.5% by weight or more.

Description

나 내식성이 우수한 아연-크롬 합금 전기도금강판의 제조방법B. Manufacturing method of zinc-chromium alloy electroplated steel sheet with excellent corrosion resistance

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명의 방법이 적용된 일실시예에 있어서 도금강판의 도금층 구조를 나타내는 모식도로서 (가)는 양면 아연-크롬 합금 도금강판 (나)는 편면 아연-크롬 합금 도금강판의 경우1 is a schematic diagram showing the plated layer structure of a plated steel sheet in one embodiment to which the method of the present invention is applied. (A) A double-sided zinc-chromium alloy plated steel sheet (B) is a single-sided zinc-chromium alloy plated steel sheet.

Claims (3)

강판에 아연-크롬 합금을 연속으로 전기도금하는 방법에 있어서, 상기 강판상에 크롬석출량이 4.5중량% 이하인 아연 크롬 합금 도금층을 형성하고, 그 위에는 크롬석출량이 4.5중량% 이상인 아연 크롬 합금 도금층을 형성하는 것을 포함하여 이루어짐을 특징으로 하는 나 내식성이 우수한 아연 크롬 합금 도금 강판의 제조방법.In a method of continuously electroplating a zinc-chromium alloy on a steel sheet, a zinc chromium alloy plating layer having a chromium precipitation amount of 4.5 wt% or less is formed on the steel sheet, and a zinc chromium alloy plating layer having a chromium precipitation amount of 4.5 wt% or more is formed thereon. Method for producing a zinc chromium alloy plated steel sheet excellent in corrosion resistance, characterized in that consisting of. 제1항에 있어서, 상기 크롬석출량이 4.5중량% 이하인 아연 크롬 합금 도금층의 형성시 도금용액중 크롬과 아연의 농도비는 1:1이하이고 전류밀도는 60A/㎡ 이하인 것을 특징으로 하는 나 내식성이 우수한 아연-크롬 합금 전기도금강판의 제조방법.According to claim 1, wherein the chromium deposition amount of 4.5 wt% or less in the formation of the zinc chromium alloy plating layer, the concentration ratio of chromium and zinc in the plating solution is less than 1: 1 and the current density is 60A / ㎡ or less excellent corrosion resistance Method for producing zinc-chromium alloy electroplated steel sheet. 제1항에 있어서, 상기 크롬석출량이 4.5중량% 이상인 아연 크롬 합금 도금층의 형성시 도금용액중 크롬과 아연의 농도비는 1:1이상이고 전류밀도는 60A/㎡ 이하인 것을 특징으로 하는 나 내식성이 우수한 아연-크롬 합금 전기도금강판의 제조방법.The method according to claim 1, wherein the concentration ratio of chromium and zinc in the plating solution is 1: 1 or more and the current density is 60 A / m 2 or less when forming the zinc chromium alloy plating layer having a chromium deposition amount of 4.5 wt% or more. Method for producing zinc-chromium alloy electroplated steel sheet.
KR1019950066195A 1995-12-29 1995-12-29 Electplating steel of the zn-cr alloy with excellent corrosion resistance and method therefor KR100256373B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950066195A KR100256373B1 (en) 1995-12-29 1995-12-29 Electplating steel of the zn-cr alloy with excellent corrosion resistance and method therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950066195A KR100256373B1 (en) 1995-12-29 1995-12-29 Electplating steel of the zn-cr alloy with excellent corrosion resistance and method therefor

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KR970043324A true KR970043324A (en) 1997-07-26
KR100256373B1 KR100256373B1 (en) 2000-05-15

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