KR20000043788A - Method for producing complex melting zinc plated steel plate - Google Patents
Method for producing complex melting zinc plated steel plate Download PDFInfo
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- KR20000043788A KR20000043788A KR1019980060209A KR19980060209A KR20000043788A KR 20000043788 A KR20000043788 A KR 20000043788A KR 1019980060209 A KR1019980060209 A KR 1019980060209A KR 19980060209 A KR19980060209 A KR 19980060209A KR 20000043788 A KR20000043788 A KR 20000043788A
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- Prior art keywords
- steel plate
- steel sheet
- silica
- zinc plated
- corrosion resistance
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 40
- 239000010959 steel Substances 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title abstract description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title abstract description 6
- 229910052725 zinc Inorganic materials 0.000 title abstract description 6
- 239000011701 zinc Substances 0.000 title abstract description 6
- 238000002844 melting Methods 0.000 title abstract 3
- 230000008018 melting Effects 0.000 title abstract 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 20
- 238000005260 corrosion Methods 0.000 claims abstract description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000005507 spraying Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910001868 water Inorganic materials 0.000 claims abstract description 4
- 239000002131 composite material Substances 0.000 claims description 17
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 10
- 239000008397 galvanized steel Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 16
- 238000007747 plating Methods 0.000 abstract description 14
- 230000003068 static effect Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 12
- 239000010410 layer Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 238000009713 electroplating Methods 0.000 description 4
- 230000005684 electric field Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000007600 charging Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000002659 electrodeposit Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000007786 electrostatic charging Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 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
- C23C2/26—After-treatment
- C23C2/265—After-treatment by applying solid particles to the molten coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/005—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means the high voltage supplied to an electrostatic spraying apparatus being adjustable during spraying operation, e.g. for modifying spray width, droplet size
-
- 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
- B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
- B05C19/02—Apparatus specially adapted for applying particulate materials to surfaces using fluidised-bed techniques
- B05C19/025—Combined with electrostatic means
-
- 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
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/06—Applying particulate materials
-
- 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
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
-
- 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
-
- 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
- B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
- B05D2401/20—Aqueous dispersion or solution
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Chemical Treatment Of Metals (AREA)
- Laminated Bodies (AREA)
Abstract
Description
본 발명은 복합용융아연도금강판의 제조방법에 관한 것으로, 특히 아연 도금층 중에 실리카 혹은 알루미나가 도금층 표층부에 존재하게 하므로서 내식성을 우수하게 할 수 있는 복합 응용 아연 도금 강판의 제조 방법에 관한 것이다.The present invention relates to a method for producing a composite hot-dip galvanized steel sheet, and more particularly, to a method for producing a composite applied galvanized steel sheet which can provide excellent corrosion resistance by allowing silica or alumina to be present in the surface layer of a galvanized layer.
복합 용융 아연 도금 강판은 아연 도금층과 산화물, 탄화물 등의 비금속성의 물질이 피복된 도금층이 피복된 강판을 말한다. 이때, 도금층의 물성은 금속에 의한 특성과 무기물의 특성이 복합화되어 서로의 단점을 보완하게 되며, 아연 도금에 있어서는 주로 내식성 향상을 목적으로 한다.The composite hot dip galvanized steel sheet refers to a steel sheet coated with a galvanized layer and a plated layer coated with a nonmetallic substance such as an oxide or a carbide. At this time, the physical properties of the plating layer is a combination of the properties of the metal and the properties of the inorganic material to complement the disadvantages of each other, in the zinc plating is mainly aimed at improving the corrosion resistance.
아연 도금에 있어서, 내식성 향상을 목적으로 하는 공지된 복합 도금 강판의 종류로는 알루미나 혹은 실리카 복합 도금 강판이 있다. 기존의 복합 도금 강판의 제조 방법으로는 전기 도금에 의한 방법이 공지되어 있다. 이 공지 기술에서는 전기 도금에 의한 방법들에 대한 것으로서, 실리카 혹은 알루미나를 콜로이달 용액 형태로 분사시킨 도금액을 사용하여 전기 도금하여 아연 이온과 함께 콜로이드 물질을 강판에 전착시키는 방법에 관한 것이다. 이 방법들에 의해 복합 도금 강판의 제조가 가능하지만, 콜로이달 상태는 용액중의 각 입자들이 동일한 극성의 표면 전하를 갖게될 때가 가장 안정한 콜로이달 상태를 나타내며, 각 입자들이 상이한 표면 전하를 갖게될 경우에는 입자들 사이에 서로 인력이 작용하여 응집되므로 안정한 상태가 깨어져 진흙과 같은 겔 상태로 되는 특성이 있다. 이와 같이, 겔이 형성되는 조건은 용액의 페하(pH) 및 수용액 중의 이온의 농도 및 종류에 의해 결정된다.In galvanizing, the kind of well-known composite plated steel plate for the purpose of improving corrosion resistance is an alumina or a silica composite plated steel sheet. As a manufacturing method of the existing composite plated steel sheet, the method by electroplating is known. This known technique relates to methods by electroplating, and to electroplating using a plating solution sprayed with silica or alumina in the form of a colloidal solution to electrodeposit a colloidal material together with zinc ions onto a steel sheet. These methods make it possible to produce composite plated steel sheets, but the colloidal state represents the most stable colloidal state when each particle in the solution has the same polarity of surface charge, and each particle will have a different surface charge. In this case, since the attraction force is agglomerated between the particles, the stable state is broken and has a characteristic of forming a gel like mud. As such, the conditions under which the gel is formed are determined by the pH of the solution (pH) and the concentration and type of ions in the aqueous solution.
이에 따라, 상기의 전기 도금법에서도 도금액의 페하(pH)가 변화되든지 혹은 도금액에 존재하는 각종 전해질에 의해 안정한 콜로이달 상태를 유지하기가 힘들고, 만약에 도금 용액에 겔 상태로 변화게 되면 용액 배관 및 펌프가 막혀 설비가 크게 손상되는 문제점이 있다.Accordingly, even in the above electroplating method, it is difficult to maintain a stable colloidal state by changing the pH of the plating liquid or by various electrolytes present in the plating liquid. There is a problem that the pump is blocked and the equipment is greatly damaged.
따라서, 본 발명의 목적은 상기한 문제점을 해결하기 위해 배관 막힘 현상이 없이 간편하게 내식성이 우수한 복합 도금 강판을 제조할 수 있는 복합 응용 아연 도금 강판의 제조 방법을 제공하는데 있다.Accordingly, an object of the present invention is to provide a method for producing a composite application galvanized steel sheet which can easily produce a composite plated steel sheet excellent in corrosion resistance without clogging the pipe to solve the above problems.
상기한 목적을 달성하기 위한 본 발명에 따른 복합 응용 아연 도금 강판의 제조 방법은, 중량으로 환산하여 0.001 %에서 20 %의 실리카 혹은 알루미나를 함유하고 나머지가 물인 콜로이달 용액을 온도가 300 ℃에서 600 ℃의 온도 사이에 있는 도금강판에 미스트 스프레이한 후, 노즐로부터 분사된 용액 방울이 강판에 부착되기 전에 (-) 혹은 (+)의 단일 극성의 고전압을 1 KV 이상 100 KV 이하의 전압으로 대전시켜 정전기적 인력에 의해 강판 표면에 도포하는 내식성이 우수한 복합 용융아연도금강판의 제조 방법을 제공하는 것을 특징으로 한다.Method for producing a composite application galvanized steel sheet according to the present invention for achieving the above object, the colloidal solution containing a silica or alumina of 0.001% to 20% in terms of weight, the remainder is water 600 at 300 ℃ After mist spraying to the plated steel sheet between the temperature of ℃, before the droplets sprayed from the nozzle adhere to the steel plate, the high voltage of (-) or (+) single polarity is charged to a voltage of 1 KV or more and 100 KV or less It is characterized by providing a method for producing a composite hot-dip galvanized steel sheet excellent in corrosion resistance applied to the surface of the steel sheet by the miracle attraction.
이하, 본 발명을 더욱 상세히 설명하기로 한다.Hereinafter, the present invention will be described in more detail.
본 발명에서, 콜로이달 용액을 도금층이 응고되기 전에 분사하면, 강판에 부착된 콜로이달 용액 중의 수분은 강판이 갖고 있는 잠열에 의해 증발하고, 강판 표면에는 고형분 만 남게 된다. 강판의 온도가 300 ℃ 이상에서는 콜로이달 물질에 흡착된 수분의 탈수 반응이 불충분하여 내식성 향상 효과가 거의 없고, 강판 온도가 600 ℃ 이상에서는 아연 도금층이 합금화 반응이 심하게 일어나서 도금층의 경도가 상승하게 되고, 수요자가 강판을 가공할 때 파우더링 현상이 심해질 위험이 크다. 통상 본 발명에서 제한하는 범위의 온도는 응용 도금 폿트에서 상부의 탑콜까지의 구간에서 강판이 갖게되는 온도이므로, 이 구간에서는 본 발명에서 제한하는 방법으로 콜로이달 용액을 강판 표면에 부착시키면, 별도의 건조 설비 없이도 복합 도금 강판을 용이하게 제조할 수 있다.In the present invention, when the colloidal solution is sprayed before the plating layer is solidified, the moisture in the colloidal solution adhering to the steel sheet is evaporated by the latent heat of the steel sheet, leaving only solid content on the surface of the steel sheet. When the temperature of the steel sheet is 300 ℃ or more, the dehydration reaction of the water adsorbed to the colloidal material is insufficient, and there is almost no effect of improving the corrosion resistance. When the steel plate temperature is higher than 600 ℃, the zinc plating layer is severely alloyed and the hardness of the plating layer is increased. Therefore, when the consumer processes the steel sheet, there is a high risk of powdering. In general, the temperature of the range limited in the present invention is the temperature that the steel sheet has in the section from the application plating pot to the top call of the upper part, and in this section, when the colloidal solution is attached to the surface of the steel sheet in a method limited by the present invention, The composite plated steel sheet can be easily produced without a drying facility.
콜로이달 용액중 실리카 혹은 알루미나의 함량이 0.001 % 이하에서는 강판에 부착된 실리카 혹은 알루미나의 량이 너무 적어 거의 효과가 나타나지 않으며, 함량이 20 % 이상의 것은 시중에서 손쉽게 구할 수 없는 문제점이 있다. 본 발명에 서는 노즐로부터 분사된 용액 방울이 강판에 부착되기 전에 (-) 혹은 (+)의 단일 극성의 공전압을 1 KV 이상 100 KV 이하의 전압으로 대전시켜 정전기적 인력에 의해 부착시키는데, 그 이유는 다음과 같다.If the content of silica or alumina in the colloidal solution is less than 0.001%, the amount of silica or alumina attached to the steel sheet is too small to have almost no effect, and the content of more than 20% has a problem that cannot be easily obtained on the market. In the present invention, before the solution droplets ejected from the nozzle are attached to the steel sheet, the negative polarity of a single polarity of (-) or (+) is charged to a voltage of 1 KV or more and 100 KV or less, which is why Is as follows.
단순히 콜로이달 용액을 노즐로부터 분사하여 강판 표면에 부착시킬 경우에는 강판의 온도가 뜨거우므로 주위 분위기와 온도 차이에 의해 열적 경계층이 형성되어 콜로이달 방울이 부착되는 것이 방해된다. 이를 극복하기 위해서는 스프레이 압력을 증가시켜야 하고, 이 경우에는 분사된 기체의 난류화가 극심하여져서 표면에 분사 궤적이 발생하여 표면에 실리카 혹은 알루미나의 부착 상태가 불균일하게 된다. 본 발명에서는 이러한 문제점을 해결하기 위해 스프레이된 콜로이달 방울에 정전 대전시켜 대전 전극과 강판 사이에 형성된 전기장과 콜로이달 방울 사이의 전기적 인력을 작용하도록 하면, 노즐로부터 분사되는 압력을 낮추어도 효과적으로 콜로이달 방울을 강판에 부착시킬 수 있고, 또한 이때 부착된 방울 중에 포함된 수분은 급속이 증발되므로 복합 도금층을 손쉽게 얻을 수 있다. 또한, 강판과 전극 사이에 형성된 전기장은 전극의 형태를 와이어의 형태로 하면, 강판 폭 방향으로 균일하게 할 수 있으므로 균일한 전기장이 형성되어 균일한 실리카 혹은 알루미나의 부착을 얻을 수 있다. 이때 정전기력이 1 KV 이하 이면, 충분한 인력이 작용하기에 전압이 낮고, 또한 100 KV 이상에서는 큰 문제점이 없지만, 100 KV 만으로도 충분한 효과를 얻을 수 있다.In case of simply spraying the colloidal solution from the nozzle and attaching it to the surface of the steel sheet, the temperature of the steel sheet is hot, so that a thermal boundary layer is formed by the temperature difference and the surrounding atmosphere, thereby preventing the colloidal droplets from adhering. In order to overcome this problem, the spray pressure must be increased, and in this case, the turbulence of the injected gas becomes severe, resulting in injection trajectories on the surface, resulting in uneven adhesion of silica or alumina on the surface. In the present invention, in order to solve the above problems by electrostatic charging of the sprayed colloidal droplets to act the electrical attraction between the electric field and the colloidal droplets formed between the charging electrode and the steel sheet, colloidal effectively even if the pressure sprayed from the nozzle is lowered The droplets may be attached to the steel sheet, and at this time, the moisture contained in the attached droplets is rapidly evaporated, so that the composite plating layer may be easily obtained. The electric field formed between the steel plate and the electrode can be made uniform in the width direction of the steel sheet when the electrode is in the form of a wire, so that a uniform electric field can be formed to obtain uniform adhesion of silica or alumina. At this time, if the electrostatic force is 1 KV or less, the voltage is low enough to work a sufficient attraction force, and there is no big problem above 100 KV, but only 100 KV can achieve a sufficient effect.
본 발명의 실시예를 통해 구체적으로 설명하기로 한다.It will be described in detail through an embodiment of the present invention.
(실시예)(Example)
Pb 0.012 %, Al 0.18 wl %의 조성을 갖는 도금욕에 강판을 침적한 강판을 에어 와이퍼하여 도금 부착량을 편면 당 150 g/㎡ 부착시킨 후에 노즐을 통해 콜로이달 용액을 분사하여 복합 도금 강판을 제조하였고, 제조된 강판의 내식성을 평가한 결과를 표 1에 나타내었다. 하기 표 1에서 내식성은 염수 분무 시험으로 실시하였고, 내식성이 아연 도금 강판과 유사한 수준으로 향상 효과가 없으면 "X", 향상 효과가 있으나 염수 분무 시험 시간 24 시간 미만이면 "△", 내식성 향상 효과가 24 시간 이상이면 "○"로 표시하였다.The composite coated steel sheet was prepared by spraying a colloidal solution through a nozzle after attaching 150 g / m 2 of the coating weight to one side by air wiping the steel plate in which the steel plate was deposited in a plating bath having a composition of Pb 0.012% and Al 0.18 wl%. Table 1 shows the results of evaluating the corrosion resistance of the prepared steel sheet. In Table 1, the corrosion resistance was carried out by the salt spray test, the corrosion resistance is similar to the galvanized steel sheet "X" if there is no improvement effect, but the salt spray test time is less than 24 hours "△", the corrosion resistance improvement effect is If it is 24 hours or more, it displayed with "(circle)".
여기서, No. 1의 경우에는 실리카가 불균일하게 부착되어 내식성 향상 효과가 작아지게 되었고, No. 4의 경우에는 가공시 도금층의 파우더링 현상이 심해지는 문제점이 발생되었다. 상기 표 1로부터 본 발명에서 제한한 조건으로 복합 응용 아연 도금 강판을 제조한 경우, 내식성이 향상됨을 알 수 있다.Here, No. In the case of 1, silica was unevenly adhered and the effect of improving corrosion resistance was reduced. In the case of 4, the powdering phenomenon of the plating layer becomes worse during processing. From Table 1, when the composite application galvanized steel sheet was manufactured under the limited conditions in the present invention, it can be seen that the corrosion resistance is improved.
상술한 바와 같이, 본 발명에 의하면 배관 막힘 현상이 없이 간편하게 내식성이 우수한 복합 응용 아연 도금 강판을 제조할 수 있는 효과가 있다.As described above, according to the present invention, there is an effect that a composite application galvanized steel sheet excellent in corrosion resistance can be easily produced without clogging a pipe.
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| KR100566133B1 (en) * | 2001-12-22 | 2006-03-30 | 재단법인 포항산업과학연구원 | Galvanized steel sheet for color coating |
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| JPS54139839A (en) * | 1978-04-24 | 1979-10-30 | Nippon Parkerizing Co Ltd | Pulverizing method for spangles of galvanized steel sheet |
| KR950004787B1 (en) * | 1992-12-30 | 1995-05-10 | 동부제강주식회사 | Fluorine resin coated galvanizing steel sheet with a high weather proof |
| NO931689L (en) * | 1993-05-10 | 1994-11-11 | Sigurd Fongen | Apparatus for electrochemical synthesis for "in-line" and "off-line" bleaching, oxidation and disinfection of organic substances in liquids. |
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