KR100369402B1 - A method of preparing hot- dip galvanizing bath with improved zinc drainage - Google Patents
A method of preparing hot- dip galvanizing bath with improved zinc drainage Download PDFInfo
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- KR100369402B1 KR100369402B1 KR10-2001-0015388A KR20010015388A KR100369402B1 KR 100369402 B1 KR100369402 B1 KR 100369402B1 KR 20010015388 A KR20010015388 A KR 20010015388A KR 100369402 B1 KR100369402 B1 KR 100369402B1
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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
- C23C2/04—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
- B05C3/005—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material incorporating means for heating or cooling the liquid or other fluent material
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Abstract
본 발명은 배출성능을 향상시킨 용융아연도금욕 제조방법에 관한 것으로, 더욱 상세하게는 도금욕에 비스무스와 알루미늄을 각각의 특성이 상호보완될 수 있도록 첨가하여 피처리물의 표면에 형성되는 아연 도금층의 배출성능을 향상시키므로서 도금된 아연이 고드름이나 방울 모양으로 굳어지는 것을 방지하는 도금의 평활도는 물론, 표면광택을 높일 수 있는 용융아연도금욕 제조방법에 관한 것이다.The present invention relates to a method for manufacturing a hot dip galvanizing bath with improved discharge performance, and more particularly to adding a bismuth and aluminum to the plating bath so that respective properties can be complemented with each other. The present invention relates to a method of manufacturing a hot dip galvanizing bath which can improve surface glossiness, as well as surface smoothness, which prevents the plated zinc from solidifying into an icicle or a drop shape while improving the discharge performance.
본 발명은 용융아연도금욕의 제조방법에 있어서, 용융욕조에서 아연을 용융점보다 높은 445∼455℃로 가열하여 용융시키고, 상기 용융아연도금욕의 조성물 함유량이 비스무스 0.025∼0.1중량%, 알루미늄 0.025∼0.05중량%, 아연 99.85∼99.95중량%로 구성되도록 상기 아연이 용융된 용융욕조에 비스무스-아연 합금과 알루미늄-아연 합금을 각각 투입 용융시켜 제조되는 것을 특징으로 한다.In the method for producing a hot dip galvanizing bath, zinc is melted by heating to 445 to 455 DEG C higher than the melting point in a hot dip bath, and the composition content of the hot dip galvanizing bath is 0.025 to 0.1 wt% of bismuth and 0.025 to aluminum. The bismuth-zinc alloy and the aluminum-zinc alloy are added to the molten bath in which the zinc is melted so as to be composed of 0.05% by weight and 99.85 to 99.95% by weight of zinc.
Description
본 발명은 배출성능을 향상시킨 용융아연도금욕 제조방법에 관한 것으로, 더욱 상세하게는 도금욕에 비스무스와 알루미늄을 각각의 특성이 상호보완될 수 있도록 첨가하여 피처리물의 표면에 형성되는 아연 도금층의 배출성능을 향상시키므로서 도금된 아연이 고드름이나 방울 모양으로 굳어지는 것을 방지하여 도금의 평활도는 물론, 표면광택을 높일 수 있는 용융아연도금욕 제조방법에 관한 것이다.The present invention relates to a method for manufacturing a hot dip galvanizing bath with improved discharge performance, and more particularly to adding a bismuth and aluminum to the plating bath so that respective properties can be complemented with each other. The present invention relates to a method for manufacturing a hot dip galvanizing bath which improves the surface gloss as well as surface smoothness by preventing the zinc from being hardened into icicles or droplets while improving the discharge performance.
19세기 중엽 프랑스와 영국에서부터 시작된 용융아연도금은 뛰어난 방식효과와 경제성이 우수하여 선진 외국에서는 이미 구조물의 방식대책으로 가장 일반화되어 있는 방식법으로서, 특히 희생적 방식특성이 있는 아연이 철과 합금층을 이루며 견고히 부착되기 때문에 치밀한 보호피막을 형성하여 가장 이상적인 방식특성을 갖고 있다.Hot dip galvanizing, which began in the mid-19th century in France and the United Kingdom, has excellent anticorrosive effect and economic feasibility. In advanced countries, galvanization is already the most common anticorrosive method for structures. Because it adheres firmly and forms a dense protective film, it has the most ideal anticorrosive properties.
이러한 용융아연도금은 최근 건설비용에 못지 않은 막대한 유지보수비를 감안하여 내구성, 경제성, 작업성 등 많은 부분에 걸쳐 그 우수성이 널리 인식되어 가고 있는 방식법으로서 대기중, 토양중, 수중 또는 콘크리트 중에서 대단히 우수한 내식성을 나타낸다.Hot-dip galvanizing is a method that is widely recognized for its excellence in durability, economy, workability, etc. in consideration of the enormous maintenance cost, which is comparable to the construction cost. It shows excellent corrosion resistance.
용융아연도금 기술은 지속적으로 진보하여 새로운 분야가 개척되고 있으며 수요량도 급격히 증가하고 있고, 특히 철도 및 교량관계, 토목·건축관계, 전력통신관계, 조선관계 등에 전반적으로 확산되고 있는데, 이것은 도금이 경제적으로 유리하다는 인식이 점차 자리잡고 있기 때문이다.Hot-dip galvanizing technology continues to advance, pioneering new fields, and rapidly increasing demand, especially in railway and bridge relations, civil and architectural relations, power communication relations, and shipbuilding relations. This is because the perception of profitability is gradually being established.
그러나 용융아연도금은 도금 후 피처리물을 용융도금욕조에서 꺼낼 때 피처리물에서 아연이 흘러 떨어지게 되는데 이러한 배출이 잘 안될 때 아연이 피처리물의 모서리나 각진 부위에 누적되거나 작은 구멍의 경우 아연으로 메워지거나 고드름 또는 방울 모양으로 굳어지기도 하여 도금 제품의 외관 불량이 발생하는 문제가 있으며, 이러한 문제가 심하면 피처리물을 운송하기 전에 양호한 표면외관을 위한 표면처리를 하여야 하므로 추가적인 인건비용이 발생하게 된다.However, hot dip galvanizing causes zinc to flow out of the workpiece when the workpiece is removed from the molten plating bath after plating, and when this is not discharged, zinc accumulates in the corners or angled portions of the workpiece or in the case of small holes. There is a problem that the appearance of the plated product is poor because it may be filled or hardened in the form of icicles or drops, and if this problem is severe, additional labor costs are incurred because the surface treatment for good surface appearance must be performed before transporting the workpiece.
전술한 바와 같이 도금 제품의 외관 불량이 발생하는 문제를 보완하기 위하여 많은 방법들이 연구되고 있으며, 그 내용으로는 국내 공개특허 제 57392호(1999.7.15.공개)에 기재된 바와 같이 도금욕의 알루미늄 농도를 0.18∼0.28중량%로 하여 도금하는 방법과 국내 공개특허 제 77023호(1999.10.25.공개)에 기재되어 있는 바와 같이 용융금속이 알루미늄 45∼60중량%, 규소 0.5∼2중량%를 함유하여 도금하는 방법이 알려져 있다.As described above, many methods have been studied to compensate for the problem that the appearance defect of the plated product occurs, and the content of the aluminum concentration of the plating bath as described in Korean Patent Publication No. 57392 (published on September 15, 1993) As a method of plating from 0.18 to 0.28% by weight and as disclosed in Korean Patent Publication No. 77023 (published on October 25, 1999), the molten metal contains 45 to 60% by weight of aluminum and 0.5 to 2% by weight of silicon. Plating methods are known.
그러나 상기 특허공보 제 57392호의 방법은 도금욕 자체에 의해 도금의 평활성을 가지지 못하고, 에어나이프와 강판과의 거리에 의해서 양호한 표면외관을 얻게 되지만 강관에 적용시 표면외관이 불량해지고, 또한 상기 특허공보 제 77023호의 방법 역시 강관에 적용시 양호한 표면외관을 얻을 수 없는 문제점이 있었다.However, the method of Patent Publication No. 57392 does not have the smoothness of plating by the plating bath itself, and a good surface appearance is obtained by the distance between the air knife and the steel sheet, but when applied to steel pipe, the surface appearance becomes poor, and also the patent publication The method of No. 77023 also had a problem that a good surface appearance could not be obtained when applied to steel pipes.
본 발명은 상기의 문제점을 해결하기 위하여 안출된 것으로 용융아연도금욕에 있어서, 도금욕에 비스무스와 알루미늄을 각각의 특성이 상호보완될 수 있도록 첨가하여 피처리물의 표면에 형성되는 아연 도금층의 배출성능을 향상시키므로서 도금된 아연이 고드름이나 방울 모양으로 굳어지는 것을 방지하는 도금의 평활도는 물론, 표면광택을 높일 수 있는 용융아연도금욕을 제조하는 것을 기술적 과제로 한다.The present invention has been made to solve the above problems in the hot dip galvanizing bath, the bismuth and aluminum in the plating bath so that the characteristics of each other complementary to the discharge performance of the zinc plated layer formed on the surface of the workpiece The technical problem is to manufacture a hot dip galvanizing bath which can improve the surface gloss as well as the smoothness of the plating to prevent the plated zinc from solidifying into icicles or droplets while improving the efficiency.
상기의 목적을 달성하기 위한 본 발명은 용융아연도금욕의 제조방법에 있어서, 용융욕조에서 아연을 용융점보다 높은 445∼455℃로 가열하여 용융시키고, 상기 용융아연도금욕의 조성물 함유량이 비스무스 0.025∼0.1중량%, 알루미늄 0.025∼0.05중량%, 아연 99.85∼99.95중량%로 구성되도록 상기 아연이 용융된 용융욕조에 비스무스-아연 합금과 알루미늄-아연 합금을 각각 투입 용융시켜 제조되는 것에 특징이 있다.According to the present invention for achieving the above object, in the method for producing a hot dip galvanizing bath, zinc is melted by heating to 445 to 455 DEG C higher than the melting point in a hot dip bath, and the composition content of the hot dip galvanizing bath is bismuth 0.025 to 0.1 wt%, 0.025 to 0.05 wt% of aluminum, 99.85 to 99.95 wt% of zinc, the bismuth-zinc alloy and the aluminum-zinc alloy are added to the molten bath in which the zinc is melted.
일반적으로 용융아연도금은 철과 아연이 접촉하여 두 금속간의 전위차에 의해 전지가 형성되고 양극으로 작용하는 아연으로부터 음극인 철로 계속적으로 전자가 공급되어 외부 반응으로부터 철을 완전히 보호하므로서 철의 부식을 방지한다. 만약, 아연 피막이 벗겨져 철 표면이 노출되어도 그 간격이 2mm를 넘지 않는다면 그 주위의 아연이 철에 대하여 음극 방식작용을 해주기 때문에 철은 부식되지 않는다.In general, hot-dip galvanizing is a battery formed by the potential difference between two metals in contact with iron and zinc, and electrons are continuously supplied from zinc, which acts as an anode, to iron, which is a cathode. do. If the zinc film is peeled off and the iron surface is exposed, the gap does not exceed 2 mm, and thus the iron does not corrode because the zinc around the cathode catalyzes the iron.
따라서 강재의 내식성을 향상시키기 위하여 소지금속에 대한 희생방식력이 뛰어난 용융아연도금을 실시하고 있으며, 또한 가격이 싸고 고속도금이 가능하며 인체에 해롭지 않은 등의 장점을 가지고 있고, 아연이 가지는 은백색의 미려함 때문에 가전용 등의 소재로도 많이 사용되어 왔다.Therefore, in order to improve corrosion resistance of steel, hot dip galvanization with excellent sacrificial corrosion resistance to base metals is carried out, and it has the advantages of low price, high speed plating, and no harm to human body. Because of its beauty, it has been used a lot in materials such as home appliances.
이러한 용융아연도금은 도금 후 잉여 용융아연의 배액은 비중, 온도, 작업물의 토출속도와 회전에 의해 제어되며, 이때 불량한 배액으로 작업물의 모서리와 각진 부분 등에 아연이 모이고, 작은 구멍과 좁은 채널 사이에 다리 모양으로 아연이 맺히기도 하며, 아연의 배액정도에 따라 아연 고드름과 방울형성 또한 영향을 받는다.In such hot dip galvanizing, the drainage of excess hot dip zinc after plating is controlled by specific gravity, temperature, and the discharge rate and rotation of the workpiece. At this time, zinc is collected in the corners and angled parts of the workpiece with poor drainage, and between small holes and narrow channels. Zinc forms in the form of legs, and zinc icicle and droplet formation are also affected by zinc drainage.
상기와 같은 아연의 배액정도를 좋게 하기 위하여 아연-비스무스 합금이 개발되었으며, 비스무스 함유 아연은 기존의 납함유 아연과 비교했을 때 동등한 배액효과를 나타내는 것으로 알려져 있고, 순수 아연에 납, 비스무스를 함께 첨가하였을 때 그 배액능에 탁월한 효과를 나타내었다.("비스무스 협회 회보, 1998 72"에서 발췌)A zinc-bismuth alloy was developed to improve the drainage of zinc as described above, and bismuth-containing zinc is known to have an equivalent drainage effect when compared to conventional lead-containing zinc, and lead and bismuth are added to pure zinc together. It showed an excellent effect on its drainage capacity (excerpted from "The Bismuth Society Bulletin, 1998 72").
그리고 알루미늄은 통상적으로 도금후의 표면광택을 향상시키며, 도금욕의 유동성을 향상시켜 도금 표면외관을 좋게 하고, 도금층과 소지철의 계면상에 합금층이 균일하게 형성되어 도금의 밀착성을 확보하기 위해서 사용하고 있다.Aluminum is generally used to improve the surface gloss after plating, to improve the surface appearance of the plating by improving the fluidity of the plating bath, and to secure the adhesion of the plating by forming an alloy layer uniformly on the interface between the plating layer and the base iron. Doing.
따라서 본 발명에 따른 배출성능을 향상시킨 용융아연도금욕 제조방법은 상기와 같은 특성을 가지는 비스무스와 알루미늄을 적절한 비율로 첨가하여 용융아연도금욕을 제조하는 것으로서, 용융욕조에서 아연을 용융점보다 높은 445∼455℃로 가열하여 용융시키고, 상기 용융아연도금욕의 조성물 함량이 비스무스 0.025∼0.1중량%, 알루미늄 0.025∼0.05중량%, 아연 99.85∼99.95중량%로 구성되도록 상기 아연이 용융된 용융욕조에 비스무스-아연 합금과 알루미늄-아연 합금을 각각 투입 용융시켜 제조되는 용융아연도금욕이다.Therefore, the method for producing a hot dip galvanizing bath with improved discharge performance according to the present invention is to prepare a hot dip galvanizing bath by adding bismuth and aluminum having the above characteristics in an appropriate ratio, and the zinc is higher than the melting point in the hot dip bath. Bismuth was melted in the molten bath in which zinc was melted so as to be melted by heating to 455 DEG C, and the composition content of the hot dip galvanizing bath was composed of 0.025 to 0.1% by weight of bismuth, 0.025 to 0.05% by weight of aluminum and 99.85 to 99.95% by weight of zinc. It is a hot dip galvanizing bath that is manufactured by adding and melting zinc alloy and aluminum-zinc alloy, respectively.
이때 알루미늄의 바람직한 함량은 0.025∼0.05중량%이며, 알루미늄이 0.025중량% 미만으로 첨가되면 드로스의 생성량이 많아져 아연의 소모량이 증가할 뿐만 아니라 도금 표면에 드로스가 부착되어 표면요철이 심해서 표면외관을 저하시키며, 도금 광택을 향상시키기에 부족하여 도금후의 표면광택이 불량하게 되고, 또한 알루미늄이 0.05중량%를 초과하여 첨가되면 아연의 배출성능이 저하되어 아연부착량이 증가하고, 평활도가 낮아지게 된다.At this time, the preferred content of aluminum is 0.025 to 0.05% by weight, and when aluminum is added at less than 0.025% by weight, the amount of dross produced increases and zinc consumption increases. It is insufficient to improve the gloss of plating, and the surface gloss after plating becomes poor, and when aluminum is added in excess of 0.05% by weight, the emission performance of zinc decreases, so that the amount of zinc deposition increases and the smoothness becomes low. .
그리고 비스무스는 아연의 배출성능을 향상시키는 성분으로서, 그 첨가량은 바람직하게는 0.025∼0.1중량%이다. 이때 비스무스를 0.025중량% 미만으로 도금욕에 첨가하면 아연의 배출성능에 효과를 얻을 수 없어 도금 표면에 아연이 고드름이나 방울 모양으로 굳어지게 되고, 또한 비스무스 함량이 0.1중량%를 초과하더라도 아연의 배출성능은 더 이상 좋아지지 않음으로 비스무스 첨가량은 0.025∼0.1중량%로 한정하는 것이 바람직하다.And bismuth is a component to improve the discharge performance of zinc, the addition amount is preferably 0.025 to 0.1% by weight. At this time, when bismuth is added to the plating bath at less than 0.025% by weight, the effect of zinc emission cannot be obtained, and zinc is hardened in the form of icicles or drops on the surface of the plating, and zinc is discharged even if the bismuth content exceeds 0.1% by weight. Since the performance does not improve anymore, the amount of bismuth added is preferably limited to 0.025 to 0.1% by weight.
이하 실시예 및 비교예를 들어 본 발명을 더욱 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
[실험예1]Experimental Example 1
두께 3mm, 가로60mm×세로80mm 크기의 강판시편을 15∼20% 염산수용액으로 산세한 후 수세하여 준비하였다. 준비된 시편을 80℃의 20∼25중량% 플럭스(염화암모늄:염화아연=1:1)를 함유한 수용액에 30∼60초 동안 침척시킨 후 자연 건조하였다. 그 다음 비스무스-아연 합금과 알루미늄-아연 합금을 각각 투입하여 표 1에 나타낸 조성으로 445∼455℃에서 용융시킨 도금욕에 시편을 3분간 침적하여 도금하였다.Steel plate specimens having a thickness of 3 mm and a width of 60 mm x 80 mm were pickled with 15-20% aqueous hydrochloric acid solution and washed with water. The prepared specimens were infiltrated in an aqueous solution containing 20-25 wt% flux (ammonium chloride: zinc chloride = 1: 1) at 80 ° C. for 30 to 60 seconds, and then naturally dried. Then, the bismuth-zinc alloy and the aluminum-zinc alloy were added, and the specimens were plated by immersion for 3 minutes in a plating bath melted at 445 to 455 ° C with the composition shown in Table 1.
시편의 평균인양속도는 0.825m/min이었으며, 동일 조건의 실험을 4∼5회 반복하여 이에 따른 각 조성별 아연의 부착량을 시편의 침적전 무게와 침적후 무게차이를 시편의 침적된 면적으로 나누어 단위면적당 무게증가로 표 1에 나타내었다.The average lifting speed of the specimens was 0.825 m / min, and the experiments were repeated 4 to 5 times under the same conditions. Thus, the zinc weight of each composition was divided by the weight before deposition and the weight difference after deposition. Table 1 shows the increase in weight per unit area.
[표 1]TABLE 1
표 1의 결과에서 보면 도금욕에 알루미늄의 첨가없이 비스무스만을 0.05∼0.3중량%로 첨가하였을 경우(비교예 2∼5) 비스무스 함량이 증가할수록 아연의 부착량이 감소하며, 비스무스 함량이 0.1중량%를 초과하여 첨가되어도 아연의 부착량은 더 이상 감소하지 않으므로 용융아연욕에 비스무스의 첨가는 아연의 배출성능을 향상시키고, 도금 표면에서 아연이 고드름 및 방울 모양으로 굳어지는 현상을 상당히 막아 주는 것을 알 수 있었다.In the results of Table 1, when only bismuth was added in an amount of 0.05 to 0.3% by weight without adding aluminum to the plating bath (Comparative Examples 2 to 5), as the bismuth content was increased, the adhesion amount of zinc decreased, and the bismuth content was 0.1% by weight. Since the adhesion amount of zinc does not decrease any more, the addition of bismuth to the molten zinc bath improves the discharge performance of zinc and significantly prevents zinc from icicle and drop formation on the plating surface. .
또한 비스무스와 알루미늄을 첨가하지 않고 아연 100중량%로 구성된 도금욕의 경우(비교예 1)에 비해 비스무스 및 알루미늄을 첨가했을 때 드로스의 생성량이 줄어들며, 특히 비스무스 0.1중량%, 알루미늄 0.025∼0.05중량%일 때에는 비교예 1에서 생성된 드로스 생성량의 1/4정도로 현저히 줄어드는 것을 알 수 있었다.In addition, in the case of a plating bath composed of 100% by weight of zinc without adding bismuth and aluminum (Comparative Example 1), the amount of dross produced is reduced when bismuth and aluminum are added, in particular, 0.1% by weight of bismuth and 0.025 to 0.05% by weight of aluminum. When it is%, it can be seen that it is significantly reduced to about 1/4 of the dross production amount produced in Comparative Example 1.
상기 실험의 결과에서 최적의 배출성능을 갖는 시편은 비스무스 0.025∼0.1중량%, 알루미늄 0.025∼0.05중량%일 때(실시예 1∼5)의 시편으로 나타났다.In the results of the above experiment, the specimen having the optimum discharge performance was found to be the specimen when the bismuth 0.025 to 0.1% by weight, aluminum 0.025 to 0.05% by weight (Examples 1 to 5).
[실험예 2]Experimental Example 2
용융아연도금의 평활도를 알아보기 위해 황산동(CuSO4)시험을 실시하였다. 비이커에 증류수 500㎖에 황산구리 180g을 넣고 가열하여 완전히 용해시킨 후 수산화제2구리(Cu(OH)2)를 0.5g 넣어서 유리 황산을 중화하였다. 이 시험액을 이물질이 들어가지 않게 입구를 막고 24시간 방치후 거름종이로 걸러서 시험액을 제조하였다.Copper sulfate (CuSO 4 ) test was conducted to determine the smoothness of the hot dip galvanizing. 180 g of copper sulfate was added to a beaker in 500 ml of distilled water, and heated to completely dissolve it. Then, 0.5 g of cupric hydroxide (Cu (OH) 2 ) was added to neutralize free sulfuric acid. The test solution was blocked by the inlet to prevent foreign substances from entering and left for 24 hours, and then filtered through a filter paper to prepare a test solution.
그 다음 실험예 1의 방법으로 도금한 시편을 표면의 이물질을 제거후 상기의 제조한 시험액에 1분간 담그었다가 꺼내어 즉시 물에 집어넣고 브러쉬로 시편 표면에 부착한 구리를 제거하였다. 똑같은 방법으로 아연도금층이 용해되어 시편 전면에 걸쳐 제거될 때까지 실험을 반복하여 아연도금층이 용해된 침적회수를 침적이 시작된 회수와 도금층이 완전히 제거된 회수의 비로 표 2에 나타내었다.Then, after removing the foreign substance on the surface of the specimen plated by the method of Experimental Example 1, it was immersed in the prepared test solution for 1 minute, taken out immediately and put in water, and the copper attached to the surface of the specimen was removed by a brush. In the same manner, the experiment was repeated until the galvanized layer was dissolved and removed over the entire surface of the specimen, and the deposition number of the galvanized layer was shown in Table 2 as the ratio of the number of times the deposition was started and the number of times the plating layer was completely removed.
[표 2] 아연도금층이 용해된 침적회수(처음/완전)[Table 2] Deposition recovery in which zinc plated layer is dissolved (first time / complete)
황산동 시험의 결과로 볼 때 비스무스의 함량이 증가하면 도금층이 용해되는 시점이 빠르므로 도금층이 보다 얇아 진다는 사실에서 비스무스가 아연의 배출성능을 향상시킴을 알 수 있었다.As a result of the copper sulfate test, it is understood that bismuth improves zinc emission performance from the fact that the plating layer becomes thinner when the content of bismuth increases as the plating layer is dissolved quickly.
또한 도금층의 침적회수에서 보여지듯이 비스무스 0.025∼0.1중량%, 알루미늄 0.025∼0.05중량%의 범위에서 일정한 도금층을 형성하여 두께편차가 크지 않음으로서 도금의 평활도도 양호한 것을 알 수 있었다.In addition, as shown in the number of times of deposition of the plating layer, a uniform plating layer was formed in the range of 0.025 to 0.1% by weight of bismuth and 0.025 to 0.05% by weight of aluminum.
이상에서 살펴본 바에 따르면 아연도금욕에 비스무스와 알루미늄을 함께 첨가하였을 때, 아연만으로 구성된 도금욕이나, 아연과 비스무스로만 구성된 도금욕 및 아연과 알루미늄으로만 구성된 도금욕보다 도금표면에서의 아연의 배출성능 및 표면광택이 좋아지며, 비스무스와 알루미늄 각각의 특성이 상호보완적으로 나타날 수 있는 첨가량의 범위, 즉 비스무스 0.025∼0.1중량%, 알루미늄 0.025∼0.05중량%의 범위 안에서 더욱 안정되고 균일한 배출성능과 표면광택이 나타나게 된다.As described above, when bismuth and aluminum are added together to the zinc plating bath, the zinc discharge performance on the surface of the plating is better than the plating bath consisting of zinc only, the plating bath consisting only of zinc and bismuth, and the plating bath consisting only of zinc and aluminum. Better surface gloss, more stable and uniform emission performance and surface within the range of addition amount where bismuth and aluminum properties can complement each other, i.e., 0.025 to 0.1 wt% of bismuth and 0.025 to 0.05 wt% of aluminum The gloss will appear.
상기와 같이 본 발명의 배출성능을 향상시킨 용융아연도금욕 제조방법은 도금욕에 비스무스와 알루미늄을 각각의 특성이 상호 보완될 수 있도록 첨가하여 피처리물의 표면에 형성되는 아연 도금층의 배출성능을 향상시키므로서, 도금된 아연이 고드름이나 방울 모양으로 굳어지는 것을 방지하고, 도금의 평활도와 표면광택을 높이는 효과가 있는 것이다.As described above, the method for manufacturing the hot dip galvanizing bath which improves the discharge performance of the present invention improves the discharge performance of the zinc plating layer formed on the surface of the workpiece by adding bismuth and aluminum to the plating bath so that respective characteristics can be complemented with each other. By doing so, the plated zinc is prevented from hardening in the form of icicles or drops, and has the effect of increasing the smoothness and surface gloss of the plating.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61288039A (en) * | 1985-06-17 | 1986-12-18 | Nikko Aen Kk | Zinc alloy for zinc hot dipping having crystal |
| JPH0270050A (en) * | 1988-09-02 | 1990-03-08 | Kawasaki Steel Corp | Hot dip galvanized steel sheet having superior lasting adhesion and blackening resistance |
| JPH03253550A (en) * | 1990-01-16 | 1991-11-12 | Nippon Steel Corp | Production of alloyed hot dip galvanized steel sheet having superior spot weldability and hot dip galvanizing bath |
| KR0136186Y1 (en) * | 1995-12-13 | 1999-03-20 | 김광호 | Discharge outlet opening and closing apparatus of airconditioner |
| KR20000043765A (en) * | 1998-12-29 | 2000-07-15 | 이구택 | Method for producing molten zinc plated steel strip having excellent corrosion resistance and surface external |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61288039A (en) * | 1985-06-17 | 1986-12-18 | Nikko Aen Kk | Zinc alloy for zinc hot dipping having crystal |
| JPH0270050A (en) * | 1988-09-02 | 1990-03-08 | Kawasaki Steel Corp | Hot dip galvanized steel sheet having superior lasting adhesion and blackening resistance |
| JPH03253550A (en) * | 1990-01-16 | 1991-11-12 | Nippon Steel Corp | Production of alloyed hot dip galvanized steel sheet having superior spot weldability and hot dip galvanizing bath |
| KR0136186Y1 (en) * | 1995-12-13 | 1999-03-20 | 김광호 | Discharge outlet opening and closing apparatus of airconditioner |
| KR20000043765A (en) * | 1998-12-29 | 2000-07-15 | 이구택 | Method for producing molten zinc plated steel strip having excellent corrosion resistance and surface external |
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