KR100782763B1 - Resin coating composition for steel sheet with improved high corroision resistance and the coating method using it - Google Patents
Resin coating composition for steel sheet with improved high corroision resistance and the coating method using it Download PDFInfo
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- KR100782763B1 KR100782763B1 KR1020010084515A KR20010084515A KR100782763B1 KR 100782763 B1 KR100782763 B1 KR 100782763B1 KR 1020010084515 A KR1020010084515 A KR 1020010084515A KR 20010084515 A KR20010084515 A KR 20010084515A KR 100782763 B1 KR100782763 B1 KR 100782763B1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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Abstract
본 발명은 내식성이 우수한 강판 수지코팅액 및 이를 이용한 강판 표면처리방법에 관한 것으로, The present invention relates to a steel sheet resin coating liquid excellent in corrosion resistance and a steel sheet surface treatment method using the same,
금속크롬으로 환산하여 크롬 부착량 1-200mg/㎡으로 크로메이트 피막처리된 아연분말을 포함함을 특징으로하는 내식성이 우수한 자동차용 강판 표면처리용 에폭시계 수지코팅액이 제공된다. 또한, 상기 수지코팅액을 크로메이트 처리된 아연도금강판에 적용하되, 건조 피막두께 2-6㎛로 도포함을 특징으로 하는 내식성이 향상된 자동차용 강판 표면처리방법이 제공된다.An epoxy resin coating liquid for surface treatment of automobiles having excellent corrosion resistance is characterized by comprising a zinc powder chromate coated with a chromium adhesion amount of 1-200 mg / m 2 in terms of metal chromium. In addition, while applying the resin coating liquid to the chromate-treated galvanized steel sheet, there is provided a method for surface treatment of automotive steel sheet improved corrosion resistance, characterized in that the coating coating with a dry film thickness of 2-6㎛.
본 발명에 따라 아연분말 표면에 크로메이트 피막처리한 것을 수지코팅용액에 혼입시키고 이를 이용하여 강판을 코팅시킴으로써, 자동차 차체중 자동차 문의 헴부위와 같은 인산염피막이나 전착도막이 형성되기 어려운 강판이 겹치는 부분에 피막두께가 얇게 형성되더라도 우수한 내식성을 확보할 수 있다.In accordance with the present invention, by coating a chromate coating on the surface of the zinc powder in a resin coating solution and coating the steel sheet using the same, coating the steel plate on the portion where the phosphate coating such as the hem portion of the automobile door or the steel plate which is difficult to form an electrodeposition coating film overlaps in the automobile body. Even if the thickness is thin, excellent corrosion resistance can be secured.
크로메이트, 피막, 아연분말, 내식성, 에폭시Chromate, Coating, Zinc Powder, Corrosion Resistance, Epoxy
Description
도 1은 본 발명의 실시예에 사용된 내식성 평가용 시편의 준비방법을 나타낸 정면도 및 측면도이다.1 is a front view and a side view showing a method of preparing a specimen for evaluation of corrosion resistance used in the embodiment of the present invention.
본 발명은 내식성이 우수한 강판 수지코팅액 및 이를 이용한 강판 표면처리방법에 관한 것으로, 보다 상세하게는 자동차 차체중 자동차 문의 헴부위와 같은 인산염피막이나 전착도막이 형성되기 어려운 강판이 겹치는 부분에 우수한 내식성을 확보하는데 적절한 내식성이 우수한 강판 수지코팅액 및 이를 이용한 강판 표면처리방법에 관한 것이다.The present invention relates to a steel sheet resin coating liquid having excellent corrosion resistance and a steel sheet surface treatment method using the same. The present invention relates to a steel sheet resin coating liquid having excellent corrosion resistance, and a steel sheet surface treatment method using the same.
철강사에서 제조된 강판은 일반적으로 자동차사에서 차체를 조립한 후, 인산염처리와 도장을 거치게 된다. 이때, 조립된 차체 중 강판이 겹치는 부위가 여러곳 발생하게 되는데, 대표적으로 자동차 문의 헴(Hem) 부위 등을 예로 들 수 있다. 이와 같이 차체 중 강판이 겹쳐있는 부위에는 인산염처리 용액이나 도료가 침투하기 어렵기때문에 내식성이 취약하게 된다.Steel sheets manufactured by steel companies are generally subjected to phosphate treatment and painting after assembling the car body in automobile companies. At this time, a number of overlapping parts of the steel plate is generated in the assembled vehicle body, for example, the hem (Hem) part of the automobile door, and the like. Thus, since the phosphate treatment solution or paint hardly penetrates the steel plate overlapping parts of the vehicle body, corrosion resistance becomes weak.
이러한 문제를 해결하기 위해 자동차 사에서는 강판이 겹치는 부위에 실링(sealing)처리를 하여 부식인자가 그 부위에 접근하는 것을 차단해 주는 방법을 사용하고 있다. 그러나, 이는 생산성 하락 및 원가상승을 유발하기 때문에 자동차 사에서는 실링 공정을 생략할 수 있는 표면처리 강판을 철강사에 요구하고 있다.In order to solve this problem, the automobile company is using a method of sealing the overlapping parts of the steel sheet (sealing) to prevent the corrosion factor from accessing the area. However, since this causes a decrease in productivity and an increase in cost, automobile companies are demanding surface-treated steel sheets that can omit the sealing process.
이에 부응하기 위하여, 유럽의 철강사들은 강판에 아연도금을 한 후, 크로메이트 처리를 하고 그 위에 약 4-10㎛두께의 유기피막을 도포한 강판을 생산하여 자동차 사에서 인산염 피막이나 도장처리가 되지않는 부위도 내식성을 확보할 수 있게 함으로써, 자동차 사가 실링 공정을 생략할 수 있게 되었다.In order to meet this problem, European steel companies have galvanized steel sheets, chromated and produced steel sheets coated with an organic film of about 4-10 μm on them. By ensuring the corrosion resistance at the site, the automobile company can omit the sealing step.
그러나, 이러한 강판은 두거운 수지피막에 의해 용접이 안되기 때문에 이를 해결하기 위하여 수지피막내에 전기 전도성이 우수한 아연과 같은 금속분말을 혼합시키는 방식으로 용접문제를 해결하고 있는데, 이 아연 입자가 내식성을 저하기키는 요인을 제공하기때문에 수지피막 두께를 더욱 두껍게 해야하고, 이로 인해 강판 생산원가가 증가하는 문제가 발생하게 된다.
However, since the steel sheet is not welded by the thick resin film, in order to solve this problem, the welding problem is solved by mixing a metal powder such as zinc with excellent electrical conductivity in the resin film. Since it provides a factor, the thickness of the resin film must be made thicker, which causes a problem of an increase in steel sheet production cost.
이에 본 발명의 목적은 자동차용 강판으로 사용되는 수지피복강판의 수지피막 두께를 낮추면서도 내식성이 확보되는 강판을 제공함으로써 강판 생산원가를 감소시키는 방법을 제공하는 것이다.Accordingly, an object of the present invention is to provide a method for reducing the production cost of steel sheet by providing a steel sheet that ensures corrosion resistance while lowering the thickness of the resin coated steel sheet used as a steel sheet for automobiles.
본 발명의 일견지에 의하면,According to one aspect of the invention,
금속크롬으로 환산하여 크롬 부착량 1-200mg/㎡으로 크로메이트 피막처리된 아연분말을 포함함을 특징으로하는 내식성이 우수한 자동차용 강판 표면처리용 에폭시계 수지코팅액이 제공된다.An epoxy resin coating liquid for surface treatment of automobiles having excellent corrosion resistance is characterized by comprising a zinc powder chromate coated with a chromium adhesion amount of 1-200 mg / m 2 in terms of metal chromium.
본 발명의 다른 견지에 의하면,According to another aspect of the present invention,
상기 수지코팅액을 크로메이트 처리된 아연도금강판에 적용하되, 건조 피막두께 2-6㎛로 도포함을 특징으로 하는 내식성이 향상된 자동차용 강판 표면처리방법이 제공된다.
Applying the resin coating liquid to the chromate-treated galvanized steel sheet, there is provided a method for surface treatment of automotive steel sheet improved corrosion resistance, characterized in that the coating film with a dry film thickness of 2-6㎛.
이하, 본 발명에 대하여 상세히 설명한다.
EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.
본 발명자는 수지피막 두께를 감소시켜 생산원가를 낮출 수 있는 방법에 대하여 연구한 결과, 아연분말 표면에 크로메이트 처리한 후, 수지코팅용액에 혼입시켜 이를 강판에 적용시키는 경우 내식성이 증가하여 수지피막 두께를 낮출 수 있음을 발견하였다.The present inventors studied a method for reducing the production cost by reducing the thickness of the resin film, after the chromate treatment on the surface of the zinc powder, mixed with the resin coating solution and applied to the steel sheet to increase the corrosion resistance of the resin film thickness It was found that can be lowered.
내식성을 향상시키기 위하여, 본 발명에서는 크로메이트 피막형성된 아연분말을 수지코팅용액에 혼입시킨다. 아연분말표면에 크로메이트 피막을 형성하는 방법은 반응형, 도포형 및 전해형이 모두 이용될 수 있지만, 바람직하게 반응형 및 도포형이 유용하다. 반응형은 주로 6가 크롬이온으로 이루어진 크로메이트 용액에 아연분말을 넣어 분말표면의 부식에 의해 상승된 표면의 pH로 인해 크로메이트 피막이 형성되는 방법인 데, 이때 크로메이트 피막의 6가와 3가 크롬 비율은 아연분말 표면의 부식반응 시 아연분말 표면에 있던 크로메이트 용액의 6가 크롬의 일정량이 3가 크롬으로 변하는 것에 의해 정해진다. 이때, 아연분말표면에 형성되는 크롬 부착량은 금속크롬으로 환산하여 크롬 부착량 1-200mg/㎡으로 크로메이트 피막처리된다. 만일, 아연분말에 크롬 부착량이 1mg/㎡이하로 존재하는 경우, 내식성이 확보되기 어려우며, 또한 200mg/㎡이상인 경우에는 고가인 크로메이트가 많이 소모되며 더 이상의 내식성 효과가 나타나지 않아 바람직하지 않다. In order to improve corrosion resistance, in the present invention, the chromate-coated zinc powder is incorporated into the resin coating solution. As the method for forming the chromate film on the surface of the zinc powder, all of the reactive type, the coated type and the electrolytic type can be used, but preferably the reactive type and the coated type are useful. The reaction type is a method in which a chromate film is formed by adding zinc powder to a chromate solution composed mainly of hexavalent chromium ions due to the surface pH elevated by corrosion of the powder surface, wherein the ratio of hexavalent and trivalent chromium of the chromate film is zinc. During corrosion of the powder surface, the amount of hexavalent chromium in the chromate solution on the surface of the zinc powder is determined by changing to trivalent chromium. At this time, the amount of chromium deposited on the surface of the zinc powder is converted into metal chromium and subjected to chromate coating with a chromium deposition amount of 1-200 mg / m 2. If the amount of chromium adhered to the zinc powder is less than 1 mg / m 2, it is difficult to ensure corrosion resistance, and if it is 200 mg / m 2 or more, expensive chromate is consumed a lot and no further corrosion resistance effect appears, which is not preferable.
이와 같이, 크로메이트 피막처리된 아연분말은 수지코팅액에 혼입되는데, 이때 사용되는 수지코팅액은 일반적으로 사용되는 에폭시계 수지를 포함하는 코팅액이 바람직하다. 본 발명에 사용가능한 에폭시계 수지는 예를들어, 비스폐놀 A계 에폭시 수지로 분자량이 3000~20000 인 것이 가장 바람직하다. 또한, 바람직하게 상기 아연분말은 에폭시계 수지에 5-30중량%로 혼합되는 것이 바람직하다. 만일, 상기 크로메이트 피막처리된 아연분말이 5% 미만으로 너무 소량 포함되는 경우, 피막의 전기 전도성이 충분하지 않아 용접성이 나쁘게 되고, 30%보다 많이 함유되는 경우에는 수지용액 내에서 아연분말의 침전에 의한 균일 분포 및 피복이 어렵다는 문제가 있다.
As such, the chromate coated zinc powder is incorporated into the resin coating liquid, and the resin coating liquid to be used is preferably a coating liquid containing an epoxy resin generally used. The epoxy resin that can be used in the present invention is most preferably a molecular weight of 3000 to 20000, for example, as bisphenolol A epoxy resin. In addition, the zinc powder is preferably mixed with 5-30% by weight of the epoxy resin. If the chromate-coated zinc powder is contained in a small amount of less than 5%, the electrical conductivity of the film is insufficient, resulting in poor weldability, and when it contains more than 30%, the zinc powder may be precipitated in the resin solution. There is a problem that uniform distribution and coating are difficult.
그리고, 이와 같이 크로메이트 피막처리된 아연분말을 포함하는 수지코팅용액을 강판에 도포하는 방법으로는 롤 코팅법 또는 스프레이법과 같은 통상의 방법 으로 도포할 수 있으며, 스프레이법이 바람직하다. 이때, 건조 피막 부착량은 2-6㎛가 되도록 한다. 건조 피막의 부착량이 2㎛이하인 경우에는 충분한 내식성을 확보할 수 없으며 아연분말에 크로메이트 처리가 되어있기때문에 6㎛이하로도 내식성이 충분히 확보되기 때문에 원가절감 측면에서 6㎛이하로 도포하는 것이 바람직하다.As a method of applying the resin coating solution containing the chromate-coated zinc powder to the steel sheet, it may be applied by a conventional method such as a roll coating method or a spray method, and a spray method is preferable. At this time, the dry film adhesion amount is set to 2-6 micrometers. If the adhesion amount of the dry film is 2㎛ or less, sufficient corrosion resistance cannot be secured. Since the zinc powder is chromated, the corrosion resistance is sufficiently secured even if the thickness is less than 6㎛, so it is preferable to apply the thickness of 6㎛ or less in terms of cost reduction. .
또한, 본 발명의 수지코팅용액은 소부과정중에 공급된 열에 의해 경화되는데 수지경화와 관련된, 바람직한 소부온도는 강판온도를 기준으로 130~250℃, 소부시간은 강판온도 도달 이 후 3초에서 15초로 한다. 강판온도 130℃이하 및 소부시간 3초 이하에서는 수지가 완전히 경화되지 못해 물성이 저하되고, 250℃이상, 15초 이상의 경우에는 강판의 기계적 물성을 변화시킬 수 있기 때문에 바람직하지않다.
In addition, the resin coating solution of the present invention is cured by the heat supplied during the baking process, the preferred baking temperature associated with the resin hardening is 130 ~ 250 ℃ based on the steel sheet temperature, baking time from 3 seconds to 15 seconds after reaching the steel sheet temperature do. If the steel sheet temperature is 130 ° C. or less and the baking time is 3 seconds or less, the resin is not completely cured, and thus the physical properties are lowered.
이하, 실시예를 통하여 본 발명을 보다 상세히 설명한다.
Hereinafter, the present invention will be described in more detail with reference to Examples.
실시예
Example
지름 1-10㎛의 입경분포를 갖는 아연분말에 금속크롬 부착량을 표 1에 나타낸 바와 같이 반응형으로 변화시키면서 혹은 표 2와 같이 50mg/㎡로 하여 크로메이트 피막처리를 실시한 후, 이를 강판 수지피복용 에폭시계 수지용액(비스폐놀 A 에폭시 분자량 8000, 경화제는 이소시안)에 10중량%로 혼합하여 수지코팅용액을 제조하였다. 그 다음, 이 수지코팅용액을 아연 부착량 60g/㎡을 갖는 아연도금강판상에 건조 피막두께 3㎛로 일정하게 혹은 0.3-6㎛로 변화시키면서 도포한 후, 건조온도 180℃로 10초간 소부 처리한 다음 냉각하여 내식성 평가용 강판시편으로 사용하였다. After coating the chromate coating on the zinc powder having a particle size distribution with a diameter of 1-10 μm by changing the amount of metal chromium to a reaction type as shown in Table 1 or at 50 mg / m 2 as shown in Table 2, A resin coating solution was prepared by mixing 10 wt% with an epoxy resin solution (bisphenol A epoxy molecular weight 8000, a curing agent isocyanate). Then, this resin coating solution was applied on a galvanized steel sheet having a zinc adhesion amount of 60 g / m 2 at constant dry film thickness of 3 μm or changed to 0.3-6 μm, followed by baking at a drying temperature of 180 ° C. for 10 seconds. It was then cooled and used as a steel sheet specimen for corrosion resistance evaluation.
내식성은 복합염수분무시험기 (CCT : Cyclic Corrosion Tester)를 이용하여 염수분무 18시간, 70o에서 2시간동안 고온건조, 염수침지 2시간, 자연건조 2시간의 순서로 순환하였으며, 이러한 순환을 50회 실시한 후 부식상태를 조사하였다. 염수분무 조건은 JIS Z 2371조건으로 실시하였다. Corrosion resistance was circulated in the order of 18 hours of salt spray, 2 hours at 70 o for 2 hours at 70 o using a salt spray tester (CCT: Cyclic Corrosion Tester), and this cycle was repeated 50 times. After the corrosion was examined. Brine spraying conditions were carried out under JIS Z 2371 conditions.
내식성 평가용 시편은 도 1과 같이 제작하였으며, 수지피복처리를 한 면이 강판이 겹치는 쪽으로 위치하도록 하였다.Specimens for corrosion resistance were prepared as shown in Figure 1, the resin-coated side was positioned so that the steel sheet overlaps.
이와 같이 제작된 시편을 자동차 도장공정 조건으로 인산염처리와 전착 도장처리를 하여 상기와 같은 조건으로 복합 염수분무시험을 하였다.The specimen thus prepared was subjected to the phosphate treatment and electrodeposition coating treatment under the automotive coating process conditions and subjected to the composite salt spray test under the above conditions.
복합염수문무시험이 끝난 후 겹친 강판을 분리시켜 강판이 겹쳐진 부위에서 부식에 의해 감소한 강판의 두께를 측정하였으며, 평가기준은 다음과 같다.After completion of the composite salt and water test, the overlapped steel sheets were separated and the thickness of the steel sheets reduced by corrosion at the overlapping steel sheets was measured. The evaluation criteria are as follows.
1 : 부식에 의한 두께 감소 : 0~0.05mm(매우 우수)1: Thickness reduction by corrosion: 0 ~ 0.05mm (very good)
2 : 부식에 의한 두께 감소 : 0..05~0.1mm(보통) 2: Thickness reduction due to corrosion: 0..05 ~ 0.1mm (normal)
3 : 부식에 의한 두께 감소 : 0.1~0.15mm(양호) 3: Thickness reduction due to corrosion: 0.1 ~ 0.15mm (good)
4 : 부식에 의한 두께 감소 : 0.15~0.2mm(저조) 4: thickness reduction by corrosion: 0.15 ~ 0.2mm (low)
5 : 부식에 의한 두께 감소 : 0.2mm 이상(매우 저조)
5: Thickness reduction by corrosion: 0.2mm or more (very low)
용접성 평가를 위해 AC 공압식 점 용접기를 사용하여 용접전류 8kA에서 가압 력 250kgf, 통전시간 16 cycle의 조건으로 용접을 실시하였으며, 이때 용접전극은 Cu-Cr합금의 RWMA Class II를 사용하였다.For the evaluation of weldability, AC pneumatic spot welding machine was used under welding condition of 250kgf pressurization time and 16 cycles of energization time at 8kA welding current, and the welding electrode was RWMA Class II of Cu-Cr alloy.
용접성은 연속 타점성을 평가하였으며, 평가용 시편은 길이 80mm, 너비 20mm로 절단된 시편 두장을 끝에서 20mm되는 지점까지 겹친 후, 겹친 부위의 가운데에 한 점 용접을 한 후 인장시험기를 이용해 용접부가 떨어지는 타점수를 조사하였으며, 이 타점수를 연속 타점수라고 하며, 평가기준은 다음과 같다.Weldability was evaluated by continuous flawability, and the test specimens were overlapped to the point where the two specimens cut to 80 mm in length and 20 mm in width to 20 mm from the end, and then welded one point at the center of the overlapped portion, and then welded with a tensile tester. Falling RBI was investigated and this RBI is called continuous RBI, and the evaluation criteria are as follows.
1 : 연속타점수 1000~1500(매우 우수) 1: RBI 1000 ~ 1500 (very good)
2 : 연속 타점 수 500~1000(보통) 2: Number of consecutive RBIs 500-1000 (normal)
3 : 연속 타점 수 300~500(양호) 3: Number of consecutive RBIs 300-500 (good)
4 : 연속 타점 수 100~3000(저조) 4: Number of consecutive RBI 100-3000 (low)
5 : 용접 불가
5: non-welding
표 1은 상기의 방법으로 평가한 시험에 대한 결과로서 수지피막의 두께를 3 μm 로 동일하게 처리한 경우 수지용액에 첨가되는 아연분말 표면의 크로메이트 부착량에 따른 영향을 조사한 것이다.
Table 1 shows the effects of chromate deposition on the surface of zinc powder added to the resin solution when the thickness of the resin film was treated in the same manner as 3 μm as a result of the test evaluated by the above method.
참고:우수 1<-- 지표 --> 열등, 모든 시편의 수지피막 두께는 3㎛로 동일
Note: Excellent 1 <-indicator-> inferior, the thickness of resin film of all specimens is equal to 3㎛
표 2는 아연분말 표면상의 크로메이트 피막 부착량을 50mg/㎡로 일정하게 유지한 상태에서 수지피막 두께에 따른 영향을 조사한 것이다.Table 2 investigates the influence of the resin film thickness in a state in which the chromate coating amount on the surface of the zinc powder is kept constant at 50 mg / m 2.
참고: 우수 <-- 지표 --> 열등, 아연분말 표면상의 크로메이트 피막 부착량(금속크롬 환산으로)은 50mg/㎡으로 동일.
Note: Excellent <-Indices-> Poor chromate coating weight (in terms of metal chromium) on the surface of zinc powder is 50 mg / m2.
상기 표 1 및 2로 부터 알 수 있는 바와 같이, 크로메이트 처리를 하지 않은 비교예 1 또는 크로메이트 부착량이 1mg/㎡미만으로 적은 비교예 2-5의 경우, 내식성이 부족하게 나타났다. 이와 비교하여, 발명예 1-12는 크로메이트 부착량이 1-200mg/㎡인 경우 충분한 내식성을 확보할 수 있었다. 그리고, 수지피막 두께가 2㎛미만인 비교예 6-12의 경우, 내식성이 열화되었으며, 이에 비하여 수지피막 두께 2-6㎛인 발명예 13-21의 경우 충분한 내식성을 확보할 수 있었다.
As can be seen from Tables 1 and 2, in Comparative Example 1 without chromate treatment or Comparative Example 2-5 having less chromate adhesion amount of less than 1 mg / m 2, corrosion resistance was insufficient. In comparison, inventive example 1-12 was able to secure sufficient corrosion resistance when the chromate adhesion amount was 1-200 mg / m 2. In Comparative Example 6-12 having a resin film thickness of less than 2 μm, the corrosion resistance was deteriorated. In contrast, in the case of Inventive Example 13-21 having a resin film thickness of 2-6 μm, sufficient corrosion resistance could be ensured.
본 발명의 방법은 아연분말 표면에 크로메이트 피막처리한 것을 수지코팅용 액에 혼입시켜 이를 이용하여 강판을 코팅시킴으로써, 자동차 차체중 자동차 문의 헴부위와 같은 인산염피막이나 전착도막이 형성되기 어려운 강판이 겹치는 부분에 피막두께가 얇게 형성되더라도 우수한 내식성을 확보할 수 있다.In the method of the present invention, the chromate coating on the surface of the zinc powder is mixed with the resin coating solution and coated on the steel sheet using the same, where the phosphate coating such as the hem portion of the automobile door or the steel plate where the electrodeposited coating film is difficult to form is overlapped. Even if the film thickness is thinly formed, excellent corrosion resistance can be secured.
Claims (4)
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| KR1020010084515A KR100782763B1 (en) | 2001-12-24 | 2001-12-24 | Resin coating composition for steel sheet with improved high corroision resistance and the coating method using it |
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| KR1020010084515A KR100782763B1 (en) | 2001-12-24 | 2001-12-24 | Resin coating composition for steel sheet with improved high corroision resistance and the coating method using it |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR850001859A (en) * | 1983-08-19 | 1985-04-10 | 노가와 쇼오지 | Automatic Punching Method and Device |
| JP2529897B2 (en) * | 1990-11-06 | 1996-09-04 | 日本ペイント株式会社 | Paint composition and coating film forming method |
| KR19980043973A (en) * | 1996-12-05 | 1998-09-05 | 김종진 | Steel color steel sheet and manufacturing method of soundproof wall outer plate using same |
| KR100256326B1 (en) * | 1995-12-30 | 2000-05-15 | 이구택 | Steel coating epoxy resin composition and the preparation of its coated steel plate having anticorrosiveness and good weldding property |
-
2001
- 2001-12-24 KR KR1020010084515A patent/KR100782763B1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR850001859A (en) * | 1983-08-19 | 1985-04-10 | 노가와 쇼오지 | Automatic Punching Method and Device |
| JP2529897B2 (en) * | 1990-11-06 | 1996-09-04 | 日本ペイント株式会社 | Paint composition and coating film forming method |
| KR100256326B1 (en) * | 1995-12-30 | 2000-05-15 | 이구택 | Steel coating epoxy resin composition and the preparation of its coated steel plate having anticorrosiveness and good weldding property |
| KR19980043973A (en) * | 1996-12-05 | 1998-09-05 | 김종진 | Steel color steel sheet and manufacturing method of soundproof wall outer plate using same |
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