KR950005352B1 - Method for making a electro-zinc coating steel sheet with an excellent surface brightness - Google Patents

Method for making a electro-zinc coating steel sheet with an excellent surface brightness Download PDF

Info

Publication number
KR950005352B1
KR950005352B1 KR1019920026526A KR920026526A KR950005352B1 KR 950005352 B1 KR950005352 B1 KR 950005352B1 KR 1019920026526 A KR1019920026526 A KR 1019920026526A KR 920026526 A KR920026526 A KR 920026526A KR 950005352 B1 KR950005352 B1 KR 950005352B1
Authority
KR
South Korea
Prior art keywords
hydrochloric acid
pickling
steel sheet
plating
glossiness
Prior art date
Application number
KR1019920026526A
Other languages
Korean (ko)
Other versions
KR940014913A (en
Inventor
김명수
안덕수
채희명
Original Assignee
포항종합제철주식회사
김만제
재단법인산업과학기술연구소
신창식
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 포항종합제철주식회사, 김만제, 재단법인산업과학기술연구소, 신창식 filed Critical 포항종합제철주식회사
Priority to KR1019920026526A priority Critical patent/KR950005352B1/en
Publication of KR940014913A publication Critical patent/KR940014913A/en
Application granted granted Critical
Publication of KR950005352B1 publication Critical patent/KR950005352B1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/22—Collecting emitted gases

Landscapes

  • 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)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The method improves the surface luster of galvanized steel strip by accurately controlling pickling conditions. During pickling process steel strips dip in the acid solution containing hydrochloric concentration of 20 to 25 weight.% for 3 to 24 seconds.

Description

표면광택성이 우수한 전기아연도금강판의 제조방법Manufacturing method of galvanized steel sheet with excellent surface gloss

제1도는 산세에 의한 강판표면의 조도변화에 따른 전류밀도 분포 개념도.1 is a conceptual diagram of the current density distribution according to the roughness change of the surface of the steel sheet by pickling.

제2도는 산세후의 강판의 최대조도변화를 염산농도 및 산세시간에 따라 나타낸 그래프.2 is a graph showing the maximum roughness change of the steel sheet after pickling according to the hydrochloric acid concentration and pickling time.

제3도는 염산농도 및 산세시간을 변화시켜 산세한 후 염산계 도금욕에서 도금한 아연결정면들의 우선배향성을 나타낸 그래프.3 is a graph showing the preferential orientation of zinc crystal surfaces plated in a hydrochloric acid plating bath after pickling by varying the concentration of hydrochloric acid and the pickling time.

제4도는 15wt% 염산에서 15초 동안 산세한 후 아연도금한 시편(a)과 25wt% 염산에서 15초 동안 산세한 후 아연도금한 시편(b)의 혹대조직사진.FIG. 4 is a photograph of the tissues of galvanized specimens after pickling in 15 wt% hydrochloric acid for 15 seconds and galvanized specimens after pickling in 25 wt% hydrochloric acid for 15 seconds.

제5도는 염산농도 및 산세시간을 변화시켜 산세한 후 염산계 도금욕에서 도금하여 도금층의 광택도를 측정한 그래프.5 is a graph measuring the glossiness of the plated layer by plating in a hydrochloric acid-based plating bath after pickling by changing the hydrochloric acid concentration and pickling time.

제6도는 염산 및 황산용액으로 산세한 후 염산계 및 황산계 도금욕에서 도금했을 때 도금층의 광택도 변화를 비교한 도표.6 is a chart comparing the change in glossiness of the plating layer when pickled with hydrochloric acid and sulfuric acid solution and then plated in a hydrochloric acid and sulfuric acid plating bath.

제7도는 염산농도 및 산세시간을 변화시켜 산세한 후 에틸렌글리콜계 결정립 미세화제가 0.08ml/l 첨가된 염산계 도금욕에서 도금한 후 도금층의 광택도를 측정한 그래프.7 is a graph measuring the glossiness of a plated layer after plating in a hydrochloric acid-based plating bath to which ethylene glycol-based grain refining agent is added after changing by hydrochloric acid concentration and pickling time.

제8도는 15wt% 염산에서 15초 동안 산세한 후 에틸렌글리콜계 결정립 미세화제가 첨가된 도금욕에서 아연도금한 시편(a)과 25wt% 염산에서 15초 동안 산세한 후 에틸렌글리콜계 결정립 미세화제가 첨가된 도금욕에서 아연도금한 시편(b)의 확대조직사진.FIG. 8 shows the addition of ethylene glycol-based grain refining agent after pickling in 15 wt% hydrochloric acid for 15 seconds, followed by galvanized specimen (a) in a plating bath to which ethylene glycol-based grain refining agent was added, and pickling in 25 wt% hydrochloric acid for 15 seconds. Enlarged photograph of specimen (b) galvanized in plating bath.

본 발명은 자동차, 건축자재 및 가전제품등에 이용되는 전기아연도금강판의 제조방법에 관한 것으로서, 보다 상세하게는 연속전기아연도금전처리과정인 산세공정의 산세조건을 조절하여 표면광택성이 우수한 전기 아연도금강판의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing an electric zinc plated steel sheet used in automobiles, building materials, and home appliances, and more particularly, electro zinc zinc having excellent surface glossiness by adjusting the pickling conditions of a pickling process, which is a continuous pretreatment of zinc coating. It relates to a method for producing a plated steel sheet.

전기아연도금강판을 생산하기 위한 도금욕은 주로 황산계와 염산계 도금욕을 사용하는데, 염산계 도금욕은 황산계 도금욕에 비해 욕저항이 작아 전류효율이 증가하여 고전류밀도 조업에 유리한 장점이 있는 반면, 전착결정이 황산계 도금욕에 비해 비교적 조대하고 불균일하여 광택도가 떨어지는 단점이 있다. 따라서 염산계 도금욕을 사용하여 도금하는 경우에도 도금층의 광택도 확보가 연구의 관심이 되어왔다.The plating bath for producing electro-galvanized steel sheet mainly uses sulfuric acid and hydrochloric acid plating bath. The hydrochloric acid plating bath is advantageous in high current density operation because the current resistance increases because the resistance of the bath is smaller than that of sulfuric acid plating bath. On the other hand, the electrodeposition crystals are relatively coarse and uneven compared to the sulfuric acid plating bath, which has the disadvantage of poor glossiness. Therefore, even when plating using a hydrochloric acid-based plating bath, securing the glossiness of the plating layer has been of interest.

염산계 도금욕을 사용하는 경우, 전기아연도금강판의 광택성을 높이기 위하여, 종래에는 유기 또는 무기 광택제를 도금액에 첨가하는 방법을 사용하였다. 이 방법에 의하면, 광택제를 도금액에 첨가함으로써, 이 광택제가 도금층의 조도를 감소시키게 되고 따라서 조사된 빛이 산란되는 비율을 감소시킴으로써 표면광택성을 확보하는 것이었다. 그러나, 광택제를 첨가하는 경우 도금효율의 감소, 표면색상의 변색등의 문제뿐만 아니라, 첨가제가 섞임으로 인하여 도금층의 응력증가에 의한 성형시 균열이 발생되는 심각한 문제점이 있었다.In the case of using a hydrochloric acid-based plating bath, in order to increase the glossiness of an electrogalvanized steel sheet, a method of adding an organic or inorganic varnish to a plating solution has been conventionally used. According to this method, by adding a polishing agent to the plating liquid, the polishing agent reduced the roughness of the plating layer and thus secured surface glossiness by reducing the rate at which the irradiated light was scattered. However, when a brightener is added, not only problems such as reduction of plating efficiency and discoloration of the surface color, but also a serious problem of cracking during molding due to increased stress of the plating layer due to mixing of additives.

한편, 광택제를 첨가하지 않고 도금조건을 조절함으로써 광택성을 높이는 방법으로서, 일본 특허공보 평4-9495호에 게재된 것이 있다. 이 방법은 통전량(전류×시간)을 7000C/dm2이상의 고전류로서 전해 산세한 다음, 황산계 도금욕에서 도금하는 방법이다. 그러나, 이 방법의 경우에는 큰 통전량으로 인하여 전력사용 비용의 상승은 물론 철 용해량 증가로 인한 제품의 단중(unit load)감소, 전해용액의 오염속도 증가에 의한 잦은 교환의 필요성 등으로 고속으로 연속도금하는 설비에는 적용하기가 매우 어려운 것이다.On the other hand, there is a method disclosed in Japanese Patent Laid-Open No. 4-9495 as a method of increasing the glossiness by adjusting the plating conditions without adding a gloss agent. This method electrolytically pickles the amount of current (current x time) as a high current of 7000 C / dm 2 or higher, and then performs plating in a sulfuric acid plating bath. In this method, however, the power consumption is increased due to the large amount of current, as well as the unit load of the product due to the increased iron dissolution, and the need for frequent exchange due to the contamination rate of the electrolyte solution. It is very difficult to apply to continuous plating equipment.

이에, 본 발명은 종래 제방법들의 결점을 해결하기 위하여 제안된 것으로서, 염산계 도금욕에 광택제를 첨가하지 않고, 도금전처리과정인 산세공정에 있어서 염산농도 및 산세시간을 조절함으로써 광택성을 높일 수 있도록 하는 연속전기아연도금강판을 제공함에 그 목적이 있다.Accordingly, the present invention has been proposed to solve the drawbacks of the conventional manufacturing methods, it is possible to increase the glossiness by adjusting the concentration of hydrochloric acid and the pickling time in the pickling process, which is a pre-plating process, without adding a brightening agent to the hydrochloric acid plating bath. The purpose is to provide a continuous galvanized steel sheet.

이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.

일반적으로 연속전기아연도금강판용 냉연강판의 최대조도(Rmax)는 8㎛인데, 이 최대조도를 7㎛ 이하로 감소시킬 수 있다면, 도금과정에서 원자밀도가 높은 아연의 기저면의 우선배향도가 8 이상 균일하게 우선배향될 수 있도록 할 수 있으며, 따라서 아연 기저면의 빛의 반사도를 증가시킬 수 있다. 한편, 전기도금의 바로 앞 단계에서 도금원판에 존재하는 산화물을 제거할 목적으로 통상 15wt% 이하의 염산농도를 산세하는 공정이 있다.In general, the maximum roughness (Rmax) of the cold rolled steel sheet for continuous electric galvanized steel sheet is 8 µm. If the maximum roughness can be reduced to 7 µm or less, the preferred orientation of the base surface of zinc having a high atomic density during the plating process is more than 8 uniform. Can be preferentially oriented, thus increasing the reflectivity of light on the zinc base. On the other hand, there is usually a process of pickling hydrochloric acid concentration of 15wt% or less for the purpose of removing the oxide present in the plating disc in the immediately preceding step of electroplating.

본 발명은 이 산세공정에 있어서, 염산농도를 20~25wt%로 하고 산세시간을 3~24초로 해줌으로써, 강판의 볼록한 부분이 화학적 효과에 의해 미소연마되어 강판의 최대조도가 7㎛ 이하가 되도록 하고, 나아가 다음단계인 도금과정에서 강판의 오목한 부분과 볼록의 부분사이의 전류밀도차가 감소하게 되고, 결과적으로 원자밀도가 높은 아연의 기저면의 우선배향도가 8 이상 균일하게 우선배향될 수 있어, 아연 기저면의 빛의 반사도가 증가되는 것을 목적으로 하는 것이다.In the present pickling process, the hydrochloric acid concentration is set to 20 to 25 wt% and the pickling time is set to 3 to 24 seconds so that the convex portions of the steel sheet are finely polished by the chemical effect so that the maximum roughness of the steel sheet is 7 µm or less. In addition, in the next step of plating, the current density difference between the concave portion and the convex portion of the steel sheet is reduced, and as a result, the preferred orientation of the base surface of zinc having a high atomic density can be preferentially aligned more than 8, so that zinc The purpose is to increase the reflectivity of light on the base surface.

제1도는 산세정도에 따른 전류밀도 분포를 나타낸 것이다. 좌측의 음극은 약산세한 강판으로서 돌출부의 끝이 예리하게 존재하기 때문에, 정전압을 인가할 경우, 돌출부에서의 전자의 분포도가 높고 따라서, 전기도금 초기과정에서 이 부위에서의 전류밀도가 평균전류밀도에 비하여 월등히 높다. 이로 인하여, 이 부위에서는 아연이온의 환원속도, 즉 전석속도가 빠르기 때문에 다양한 결정면을 갖는 도금층이 성장하게 된다.Figure 1 shows the current density distribution according to the pickling degree. The negative electrode on the left side is a weakly picked steel plate, and the tip of the protrusion is sharply present. Therefore, when a constant voltage is applied, the electron distribution in the protrusion is high. Therefore, the current density at this site is the average current density in the initial process of electroplating. It is much higher than that. For this reason, since the reduction rate of zinc ion, ie, the deposition rate, is high in this region, a plating layer having various crystal faces grows.

한편, 제1도에서 우측의 음극은 염산농도 20~25wt%에서 3~24초 동안 강산세한 강판이다. 이 강판의 최대조도는 7㎛ 이하로서 돌출부의 끝이 염산에 의하여 용해되어 평활화된 것이므로, 이 부위에서의 전류 밀도가 감소함으로 인하여 아연이온의 전석속도가 느리기 때문에 아연의 표면에너지가 가장 낮은 결정면이 표면에 노출, 또는 소지판에 평행하게 우선적으로 성장하게 된다. 원자가 조밀배열하게 되면 외부와 결합할 수 있는 배위수가 감소하기 때문에, 아연결정의 표면에너지는 최조밀배열을 하고 있는 기저면(001 또는 002)에서 가장 적다.On the other hand, the negative electrode on the right in FIG. 1 is a steel sheet strongly pickled for 3 to 24 seconds at a hydrochloric acid concentration of 20 to 25wt%. The maximum roughness of this steel sheet is 7 µm or less, and the tip of the protrusion is smoothed by dissolving with hydrochloric acid. Therefore, the crystallization surface of zinc has the lowest surface energy due to the slow deposition rate of zinc ions due to the decrease of current density in this region. It is preferentially grown on the surface or parallel to the base plate. When atoms are densely arranged, the number of coordination bonds with the outside decreases, so that the surface energy of the zinc crystal is the smallest at the base surface (001 or 002) that is densely arranged.

염산농도를 25% 이상으로 하는 경우에는 냉연강판이 너무 심하게 부식되어 표면조도가 오히려 증가하는 역효과를 나타낸다. 산세시간도 25% 염산에서 21초 이상으로 산세할 경우 과산세에 의하여 표면이 검게 변색되어 광택도가 떨어진다.If the hydrochloric acid concentration is 25% or more, the cold rolled steel sheet is corroded so badly that the surface roughness is rather increased. If the pickling time is also pickled for more than 21 seconds in 25% hydrochloric acid, the surface becomes black due to over pickling and the glossiness is reduced.

이하 본 발명을 실시예를 통하여 설명한다.Hereinafter, the present invention will be described through examples.

(실시예 1)(Example 1)

일반 가정용 냉연강판을 탈지한 후 30℃, 15~30wt% 염산농도에서 3~24초 동안 산세하여 수세한 다음 강판의 조도변화를 염산농도와 산세시간과의 관계에서 측정하였다. 제2도는 그 측정결과를 도표로 표시하는 것이다. 제2도로부터 알 수 있듯이, 15% 이하의 염산에서 산세한 경우에도 산세시간이 증가해도 원판 조도에는 거의 변화가 없지만, 20~25%의 염산에서 산세한 경우에는 산세시간이 일정시간 증가함에 따라 원판조도가 감소하였다.After degreasing cold rolled steel sheets in general households, they were rinsed with water for 3 to 24 seconds at 30 ° C and 15 to 30 wt% hydrochloric acid concentration. 2 shows the result of the measurement in a chart. As can be seen from FIG. 2, even when pickling in hydrochloric acid of 15% or less, even if the pickling time increases, the roughness of the original plate is almost unchanged, but when pickling in 20 to 25% hydrochloric acid, the pickling time increases with a certain time. Disc roughness decreased.

한편, 30%의 염산에서는 오히려 조도가 증가함을 알 수 있었고, 심지어 20~25% 염산에서 산세하는 경우에 있어서도 산세기간이 길어짐에 따라 조도가 증가함을 알 수 있었다.On the other hand, it was found that the roughness was increased in 30% hydrochloric acid, and even when pickling in 20-25% hydrochloric acid, the illuminance increased with longer pickling period.

제3도는 위에서와 같이 산세한 냉연강판을 염화물계 도금욕(Zn2+80g/ℓ, Cl-260g/ℓ, pH 5, 온도60℃)에서 도금한 후 각각의 염산농도에서 15초 동안 산세한 시편들에 대하여 X선(Cu-Ka) 회절강도를 분석한 결과를 나타낸 것이다.FIG. 3 shows that the cold rolled steel plate pickled as above is plated in a chloride plating bath (Zn 2+ 80 g / l, Cl - 260 g / l, pH 5, temperature 60 ° C.) and pickled for 15 seconds at each hydrochloric acid concentration. X-ray (Cu-Ka) diffraction intensity is analyzed for the specimens.

염산농도 15wt% 이하에서 산세한 후 도금한 시편의 경우에는 도금층의 아연 기저면의 우선배향지수가 7.5 이하인 반면, 20~25wt%에서는 우선배향지수가 9 이상으로 증가하였다.In the case of specimens plated after pickling at a hydrochloric acid concentration of 15wt% or less, the preferred orientation index of the zinc base surface of the plating layer was 7.5 or less, while the preferred orientation index increased to 9 or more at 20-25wt%.

그러나, 본 발명의 산세조건 범위를 벗어난 염산농도 30wt%인 용액에서 산세했을 경우에는 우선배향지수가 7 이하로 감소함을 알 수 있었다.However, when pickling in a solution having a hydrochloric acid concentration of 30wt% outside the range of pickling conditions of the present invention, it was found that the preferred orientation index is reduced to 7 or less.

제4도는 상기와 같이 실험한 시편의 SEM 조직을 확대촬영한 것이다.Figure 4 is an enlarged image of the SEM structure of the specimen tested as described above.

제4도에서 알 수 있는 바와같이 15%의 염산용액에서 15초 동안 산세한 시편(제4(a)도)에서는 원자밀도가 높은 육방결정이 표면에 각도를 이루고 전착되었으나, 본 발명에 부합되는 산세조건인 25% 염산용액에서 15초 동안 산세한 시편(제4(b)도)에서는 원자밀도가 높은 육방결정이 표면에 평행하게 전착되어 있다.As can be seen in FIG. 4, in a specimen pickled for 15 seconds in 15% hydrochloric acid solution (FIG. 4 (a)), hexagonal crystals having a high atomic density were electrodeposited at an angle to the surface. In a specimen pickled for 15 seconds in 25% hydrochloric acid solution (Fig. 4 (b)), hexagonal crystals having a high atomic density were electrodeposited parallel to the surface.

이상과 같은 조건으로 실험한 시편의 도금층 광택도를 입사각 60℃로 측정한 결과를 제5에 나타내었다. 염산농도가 15wt%인 용액에서 산세한 후 도금한 경우에는 산세시간에 관계없이 도금층의 광택도가 12 이하이지만 20~25wt%인 염산용액에서 산세한 후 도금한 경우에는 도금층의 광택도가 24까지 증가하였다. 그러나 제6도에 나타낸 바와같이 염산용액에서 산세한 후 황산계 도금욕에서 도금하거나, 황산용액으로 산세한 후 도금할 경우 도금층의 광택도 증가가 거의 없었다.The result of measuring the plating layer glossiness of the test piece tested under the above conditions at an incident angle of 60 ° C. is shown in FIG. 5. In the case of plating after pickling in a solution having a hydrochloric acid concentration of 15 wt%, the gloss of the plating layer was 12 or less regardless of the pickling time, but in the case of plating after pickling in a hydrochloric acid solution of 20 to 25 wt%, the plating layer had a gloss of 24 Increased. However, as shown in FIG. 6, when the plate was pickled in a hydrochloric acid solution and plated in a sulfuric acid plating bath, or plated after pickling with a sulfuric acid solution, there was almost no increase in glossiness of the plated layer.

(실시예 2)(Example 2)

실시예 1에서와 같은 조건으로 산세한 후 에틸렌글리콜계 결정립 미세화제가 0.08ml/ℓ첨가된 도금욕에서 도금하여 광택도를 측정하였다. 제7도는 그 측정결과를 염산농도 및 산세시간과의 관계에서 표시한 것이다. 제7도에서 알 수 있듯이, 20~25% 염산농도에서 산세한 후 염화물계 도금욕에서 도금한 경우가 광택도가 가장 좋았으며, 또한 그 광택도는 산세시간이 증가함에 따라 점차 증가하다가 일정시간이 경과하면서 점차 감소하였다.After pickling under the same conditions as in Example 1, the glossiness was measured by plating in a plating bath in which an ethylene glycol-based grain refiner was added at 0.08 ml / l. 7 shows the measurement results in relation to hydrochloric acid concentration and pickling time. As can be seen in FIG. 7, the highest gloss was obtained by pickling at a concentration of 20-25% hydrochloric acid and plating in a chloride plating bath, and the gloss gradually increased as the pickling time was increased. It gradually decreased over time.

아연도금제품은 자동차, 건축자재 및 가전제품등에 많이 사용되고 있다. 특히, 가전제품의 경우에는 전자제품으로서의 고유기능외에 장식품으로서의 기능도 갖고 있기 때문에 그 외관의 미려여부는 그 제품의 상품으로서의 성공여부를 좌우하기도 한다. 한편, 가전제품용 소재인 전기아연도금강판은 외판인 경우에는 인산 염처리나 크로메이트처리 또는 내지문처리등의 후처리를 거친 후 최종 외관이 되는 도장처리가 되며, 내판에 적용될 경우에는 피막두께가 얇은 후처리만 실시하는 것이 일반적이다. 따라서 전기아연도금강판의 광택성은 최종제품의 외관에 직접적인 영향을 미치게 된다.Galvanized products are widely used in automobiles, building materials and home appliances. In particular, in the case of home appliances, in addition to the intrinsic function as an electronic product, as a decoration, the beauty of the appearance may determine whether the product is a success as a product. On the other hand, the electro-galvanized steel sheet, which is a material for home appliances, is subjected to post-treatment such as phosphate treatment, chromate treatment, or anti-fingerprint treatment in the case of an outer plate, and becomes a final coating, and when applied to an inner plate, a thin film thickness It is common to carry out only post-treatment. Therefore, the glossiness of the galvanized steel sheet has a direct influence on the appearance of the final product.

이상에서 본 바와 같이, 본 발명은 염화물계 도금욕을 사용하여 연속전기도금을 행함에 있어 도금전처리공정인 산세처리과정에서 그 산세조건을 조절함으로써 아연도금강판의 광택성을 높이는 방법이므로, 그 실시에 있어 간편하고, 또한 도금된 후 색상의 변화나 균열이 발생되는 그러한 문제점이 없다. 따라서, 본 발명은 별도 공정이 부가되거나 비용의 추가부담이 없이 아연도금강판의 광택성을 현저하게 높일 수 있는 유용한 것이라 하겠다.As described above, the present invention is a method of increasing the glossiness of galvanized steel sheet by adjusting the pickling conditions in the pickling process, which is a pre-plating step, in performing continuous electroplating using a chloride plating bath. It is simple in terms of color, and there is no such problem that color change or cracking occurs after plating. Therefore, the present invention will be useful to remarkably increase the glossiness of galvanized steel sheet without additional process or additional cost.

Claims (1)

도금전처리과정인 산세공정을 실시한 다음, 염화물계 도금욕에서 연속전기아연도금을 행하여 아연도금강판을 제조하는 방법에 있어서, 상기 산세공정이 20~25wt%의 농도의 염산용액에서 3~24초 동안 이루어짐을 특징으로 하는 표면광택성이 우수한 전기아연도금강판의 제조방법.In the method of producing a galvanized steel sheet by performing a pre-plating pickling process, followed by continuous electrogalvanizing in a chloride plating bath, the pickling process is for 3 to 24 seconds in a hydrochloric acid solution of 20 ~ 25wt% concentration Method for producing an electro-galvanized steel sheet having excellent surface glossiness, characterized in that made.
KR1019920026526A 1992-12-30 1992-12-30 Method for making a electro-zinc coating steel sheet with an excellent surface brightness KR950005352B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920026526A KR950005352B1 (en) 1992-12-30 1992-12-30 Method for making a electro-zinc coating steel sheet with an excellent surface brightness

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920026526A KR950005352B1 (en) 1992-12-30 1992-12-30 Method for making a electro-zinc coating steel sheet with an excellent surface brightness

Publications (2)

Publication Number Publication Date
KR940014913A KR940014913A (en) 1994-07-19
KR950005352B1 true KR950005352B1 (en) 1995-05-23

Family

ID=19347668

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019920026526A KR950005352B1 (en) 1992-12-30 1992-12-30 Method for making a electro-zinc coating steel sheet with an excellent surface brightness

Country Status (1)

Country Link
KR (1) KR950005352B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100428019B1 (en) * 2000-12-13 2004-04-30 현대하이스코 주식회사 Manufacturing process of highly qualified, surface-treated zinc electroplated steel sheet

Also Published As

Publication number Publication date
KR940014913A (en) 1994-07-19

Similar Documents

Publication Publication Date Title
US4464232A (en) Production of one-side electroplated steel sheet
Ramanauskas et al. Structural and corrosion characterization of pulse plated nanocrystalline zinc coatings
KR0175967B1 (en) Steel plate plated with zinc and method for preparation of the same
Karahan Effects of pH value of the electrolyte and glycine additive on formation and properties of electrodeposited Zn-Fe coatings
CN1277960C (en) Method of producing bright anodized finishes for high magnesium, aluminum alloys
US3296100A (en) Process for producing anticorrosive surface treated steel sheets and product thereof
KR950005352B1 (en) Method for making a electro-zinc coating steel sheet with an excellent surface brightness
US4406756A (en) Hard chromium plating from hexavalent plating bath
US4806226A (en) Process for electrolytically coloring aluminum material
CN107208298B (en) Sn-plated steel sheet, chemical conversion-treated steel sheet, and methods for producing these
Hickling et al. Cyclic Electrolysis: Part II—The Influence of Periodic Reversal of Current Upon the Surface Roughness of Electrodeposited Copper
JPH07331483A (en) Production of electrogalvanized steel sheet
Zemanová et al. Pulse nickel electrolytic colouring process of anodised aluminium
JPH0849091A (en) Production of electrogalvanized steel sheet
JP2001049483A (en) Electrogalvanized steel sheet excellent in color tone and its production
CN116219510B (en) High corrosion resistance electrogalvanized iron plate and production method thereof
EP3901332B1 (en) Electroplated steel sheet having excellent surface appearance, and manufacturing method therefor
JPH06240490A (en) Corrosion resistant chromium plating
KR20020047425A (en) Zinc electroplated steel sheet having a good surface appearance and quality
KR100578215B1 (en) The method of developing electrogalvanized steel sheet in sulfate bath
JPH0676675B2 (en) Method for producing galvanized steel sheet with excellent chemical conversion treatability and post-painting performance
KR100276314B1 (en) Manufacturing method of electric tin plated steel sheet with excellent surface gloss, uniformity and corrosion resistance
JPH0336296A (en) Surface treatment of stainless steel
KR940000282B1 (en) Method for making a galvanized steel sheet with excellant brightening and whitening
KR960008154B1 (en) Method for manufacturing a electro-zinc plating steel sheets with an excellent surface brightness

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
G160 Decision to publish patent application
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20000428

Year of fee payment: 6

LAPS Lapse due to unpaid annual fee