KR910003743B1 - Sheet steel member coated with insulating phosphate - Google Patents

Sheet steel member coated with insulating phosphate Download PDF

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KR910003743B1
KR910003743B1 KR1019830002049A KR830002049A KR910003743B1 KR 910003743 B1 KR910003743 B1 KR 910003743B1 KR 1019830002049 A KR1019830002049 A KR 1019830002049A KR 830002049 A KR830002049 A KR 830002049A KR 910003743 B1 KR910003743 B1 KR 910003743B1
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phosphate
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insulating
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coated
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KR840004793A (en
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미챌 베이브 릭 놀만
세프코 존
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웨스팅하우스 일렉트릭 코오포레이숀
시. 에프. 오우벌메설
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    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C22/00Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/23Condensed phosphates
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C22/00Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/73Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
    • C23C22/74Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process for obtaining burned-in conversion coatings
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C22/00Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08Orthophosphates
    • C23C22/20Orthophosphates containing aluminium cations
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147Alloys characterised by their composition
    • H01F1/14766Fe-Si based alloys
    • H01F1/14775Fe-Si based alloys in the form of sheets
    • H01F1/14783Fe-Si based alloys in the form of sheets with insulating coating

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

내용 없음.No content.

Description

절연성 인산염이 피복된 박판용 강부재Steel member for thin plate coated with insulating phosphate

본 발명은 절연성 인산염이 피복된 박판용 강부재에 관한 것이다. 발전기, 변압기, 전기모터 등에 사용되는 자성코어는 적층된 박판용강을 펀칭하여 제조하며, 이때 각 적층면상에는 절연재가 피복되어 있다. 당업계에 공지되어 있는 바와같이 상기 코어는 중실강(中實剛)이 아닌 적층형으로 사용하여, 상기 코어사용시 바람직하지 못한 와류가 최소로 감소되도록 한다.The present invention relates to a steel member for thin plates coated with insulating phosphate. Magnetic cores used in generators, transformers, electric motors, etc. are manufactured by punching laminated sheet steel, and an insulating material is coated on each laminated surface. As is known in the art, the cores are used in a stack rather than in solid steel, so that undesirable vortices are reduced to a minimum when the cores are used.

소위 모노인산알루미늄이라 불리우는 울트인산알루미늄은 펀칭된 박판용강의 층사이에 절연체를 형성시키기 위해 희석된 형태로 사용되는 무기질 피복용제이다. 이는 전기모터, 발전기, 변압기의 코어의 층사이에 전기저항을 제공하여, 기계에서 와류 손실을 최소화시키는데 도움을 주게 된다. 희석되지 않은 농도에서 피복용제는 인산과 알루미나 수화물의 혼합물로 이루어져 있으며, 대략 33중량%의 P2O5, 8중량%의 Al2O3, 59중량%의 H2O를 함유한다.The so-called aluminum monophosphate, called aluminum monophosphate, is an inorganic coating solvent used in diluted form to form an insulator between layers of punched sheet steel. This provides electrical resistance between the layers of the cores of electric motors, generators and transformers, helping to minimize eddy current losses in the machine. At undiluted concentrations, the coating solution consists of a mixture of phosphoric acid and alumina hydrate, containing approximately 33% by weight of P 2 O 5 , 8% by weight of Al 2 O 3 , and 59% by weight of H 2 O.

상기 형태의 피복용제는 예컨대 알코퍼스(Alkophos)라는 상표로 시판되고 있으며, 전기설비 산업분양에서는 광범위하게 사용된다. 이는 설비제조업자 또는 전기강 공급자에 의하여 전기강에 사용된다. 상기에서 설명한 모노인산알루미늄용제는 일반적으로 사용전에 물에 좀더 희석된다. 일반적으로 유용한 농도는 필요한 두께 및 전기저항과 피복시 사용되는 피복기전에 따라 1체적부의 모노인산알루미늄과 0.5 내지 4체적부의 H2O로 이루어진다. 상기 용제는 펠트(felt)로울 또는 고무로울로 강에 피복된 다음 텐덤오븐에서 건조된다. 상기 형태의 인산염 피복은 당업계에 공지되어 있으며, 미합중국 특허 제2,734,203호(스테인헬쯔)에 기술되어 있는 바와같이 주로 열간압연강의 피복으로 사용되어 왔는데, 여기에서는 박판용강의 건조온도를 135°내지 500℃로 하고 열을 이용하여 수분을 제거시킴으로써 박판의 철금속표면과 반응된 얇은 인산염 피복을 형성하였다. 상기 피복은 높은 절연값 및 양호한 점적률(space factor)을 가진다. 또한 상기 피복은 제조중의 처리단계 또는 전기기기에 사용될시 직면하게 되는 열, 기계 및 화학적인 여러종류의 위험에 견딜수 있는 것으로 판명되었다.This type of coating solvent is commercially available under the trademark Alkophos, for example, and is widely used in the electrical equipment industry. It is used for electrical steel by equipment manufacturers or electrical steel suppliers. The aluminum monophosphate solvents described above are generally diluted further with water before use. Generally useful concentrations consist of 1 volume part aluminum monophosphate and 0.5-4 volume parts H 2 O depending on the required thickness and electrical resistance and the coating mechanism used for coating. The solvent is coated in steel with felt or rubber rolls and then dried in a tandem oven. Phosphate coatings of this type are well known in the art and have been used primarily as hot rolled steel coatings, as described in US Pat. No. 2,734,203 (Stainless Steel), wherein the drying temperature of sheet steel is 135 ° to 500 ° C. The phosphate coating reacted with the ferrous metal surface of the sheet to form a thin phosphate coating by removing the moisture by using the heat at ℃. The sheath has a high insulation value and a good space factor. It has also been found that the sheath can withstand a variety of thermal, mechanical and chemical hazards encountered when used in processing steps during manufacture or in electrical equipment.

그러나 반응성이 낮은 표면을 가진 냉간압연강이 널리 사용되는 현재의 경우에는, 변형되지 않은 인산염 피복을 경화시키기 위해 요구되는 상업적인 박판용강의 온도는 130°이다. 상기 박판용강의 온도(따라서 인산염 피복의 온도가 됨)를 얻기 위해서는 오븐의 온도를 노의 구조, 콘베이어의 속도 및 층의 두께에 따라 일반적으로 박판용강의 온도보다 425°내지 650℃정도 높게 설정하여야 한다. 상기와 같은 고온건조온도는 천연가스, 오븐 가열 전열비, 변형시키지 않은 재료 사용시 느린 피복속도로 인한 노동력, 장비유지 가격등이 고가이므로 공정이 고가로되며, 피복로울에 고온이 전달되어 미경화될 가능성이 증가되는 등의 문제점이 발생된다.However, in the present case where cold rolled steel with a low reactivity surface is widely used, the temperature of commercial sheet steel required to cure unmodified phosphate coating is 130 °. In order to obtain the temperature of the sheet steel (and thus the temperature of the phosphate coating), the temperature of the oven should generally be set to be 425 ° to 650 ° C. higher than the temperature of the sheet steel, depending on the structure of the furnace, the speed of the conveyor and the layer thickness. do. Such high temperature drying temperature is expensive due to high labor cost, equipment maintenance price, etc. due to slow coating speed when using natural gas, oven heating heat transfer ratio, unmodified material, and high temperature is transferred to the coating roll, which may lead to uncuring. This problem is increased.

따라서 종래의 피복 또는 피복공정과 동등한 중간피복 특성, 절연성 특성 및 점적률 특성 등을 제공할 수 있는 간단하고 값싼 새로운 피복 또는 개선된 피복공정을 필요로 하였다.Therefore, there is a need for a simple and inexpensive new coating or improved coating process that can provide intermediate coating properties, insulating properties, and spot rate properties equivalent to conventional coating or coating processes.

따라서, 본 발명은 100체적부의 수성인산알루미늄과 1 내지 15 체적부의 질산으로 이루어진 수용액으로부터 유도되는 경화된 절연 인산염으로 피복된 박판용 강부재에 관한 것이다.Accordingly, the present invention relates to a steel sheet for thin plates coated with cured insulating phosphate derived from an aqueous solution consisting of 100 parts by volume aqueous aluminum phosphate and 1 to 15 parts by volume nitric acid.

상기 인산염 피복은 1체적부의 수성모노인산알루미늄용제와 0.5 내지 4체적부의 부가희석수 및 희석된 모노인산알루미늄용제의 체적에 대해 3 내지 12체적%의 질산으로 이루어진 희석된 인산알루미늄 용제의 혼합물이다.The phosphate coating is a mixture of dilute aluminum phosphate solvent consisting of 3 parts by volume aqueous aluminum monophosphate solvent, 0.5-4 parts by volume of dilution water and 3-12% by volume of nitric acid to dilute aluminum monophosphate solvent.

뜻밖에 상기 질산의 첨가로 변형되지 않은 인산염 피복의 피복성, 절연성 및 점적률 특성들을 유지하면서, 인산염 피복을 건조시키기 위해 요구되는 상업적인 박판용강의 온도를 약 90℃로 낮게할 수 있음을 알았다. 상기와 같이 온도를 낮춤으로해서 취급에 따른 문제점을 최소로 하고 필요 에너지를 감소시킬 수 있는 부가적인 장점을 얻을 수 있었다.It has been found that the temperature of the commercial thin sheet steel required for drying the phosphate coating can be lowered to about 90 ° C., while unexpectedly maintaining the coating, insulating and dripping properties of the phosphate coating unmodified by the addition of nitric acid. By lowering the temperature as described above, it was possible to obtain the additional advantage of minimizing the problem of handling and reducing the required energy.

다양한 철기제 금속의 박판을 본 발명에 따라 피복시킬 수 있다. 따라서 7중량% 이상의 규소를 함유한 규소-철 박판을 본 발명에 따라 피복할 수 있으며, 많은 철을 함유하고 하나 또는 그 이상의 금속과 합금을 이루는 다른 자성박판도 본 발명에 따라 피복할 수 있게 된다. 상기와 같은 모든 박판은 일반적으로 연속 냉각압연 된다. 본문에서 사용하는 "철 박판용강"(ferrous sheet steel)이란 말은 상기한 임의의 금속을 함유한 것을 의미한다.Thin plates of various iron base metals can be coated according to the invention. Thus, a silicon-iron thin plate containing at least 7% by weight of silicon can be coated according to the present invention, and other magnetic thin plates containing a large amount of iron and alloying with one or more metals can be coated according to the present invention. All such thin plates are generally continuously cold rolled. As used herein, the term "ferrous sheet steel" means containing any of the metals described above.

본 발명의 경화된 인산염 피복은 희석된 수성인산알루미늄과 HNO3의 혼합물이며, 이 혼합물에는 희석된 인산알루미늄용제의 체적을 기준으로 HNO3가 1체적% 내지 15체적%, 양호하게는 3체적% 내지 12체적%, 가장 양호하게는 3체적% 내지 8체적% 함유되어 있다. HNO3가 1체적% 이하이면 경화상태가 개선되지 않으며, HNO3가 15체적% 이상이면 피복용제가 과도하게 부식성을 가진다.The cured phosphate coating of the present invention is a mixture of a dilute aqueous aluminum phosphate and HNO 3, and the mixture is HNO 3 is 1% by volume to 15% by volume based on the volume of the diluted aluminum phosphate solvent, preferably 3% by volume To 12 vol%, most preferably 3 to 8 vol%. If the HNO 3 is 1 vol% or less, the curing state is not improved. If the HNO 3 is 15 vol% or more, the coating solvent is excessively corrosive.

희석된 수성올트인산알루미늄 조성은 100체적부의 수성인산알루미늄제로 이루어져 있다. 상기 인산알루미늄 조성물은 일반적으로 인산과 알루미나 수화물의 혼합물인데, 이것은 P2O5및 Al2O3로 기술할 수 있다. 인산알루미늄 조성물은 28 내지 38중량%, 적합하게는 30 내지 35중량%의 P2O5와, 5 내지 12중량%, 적합하게는 7 내지 10중량%의 Al2O3와, 50 내지 70중량%의 물과, 적합하게는 50체적부 내지 400체적부, 가장 적합하게는 100 내지 250체적부의 부가희석수로 이루어져 있다. 부가희석수의 체적부가 50 이하이면, 전기강을 균일하게 피복하기가 어렵게 된다. 부가희석수의 체적부를 400이상으로 하면, 피복이 너무 얇아져 절연효과의 손실을 야기한다.The diluted aqueous aluminum phosphate composition consists of 100 parts by volume of aqueous aluminum phosphate. The aluminum phosphate composition is generally a mixture of phosphoric acid and alumina hydrate, which can be described as P 2 O 5 and Al 2 O 3 . The aluminum phosphate composition is 28 to 38 wt%, suitably 30 to 35 wt% P 2 O 5 , 5 to 12 wt%, suitably 7 to 10 wt% Al 2 O 3 , 50 to 70 wt% % Water and suitably 50 to 400 volume parts, most suitably 100 to 250 volume parts of added dilution water. If the volume part of the added dilution water is 50 or less, it becomes difficult to uniformly coat the electric steel. If the volume portion of the added dilution water is 400 or more, the coating becomes too thin, causing loss of insulation effect.

수성모노인산알루미늄 조성물은 P2O5+Al2O3의 고체 함량 33 내지 50중량%로 이루어져 있으며, 여기에서 아연, 인산아염 및 니켈같은 물질들은 특히 배제하였다. 그러나 예컨대

Figure kpo00001
족을 함유하는 중간고리 알킬족과 같은 물질인, 강에 대한 효과적인 비이온 습윤제의 량은 당업계에 공지된 바와같이 최대 1.5체적%, 적합하게는 0.5 내지 1.2체적%가 사용될 수 있으며, 습윤제가 0.5체적% 이하이면, 강은 습윤되지 않거나 또는 인산염 포복제가 강에대해 접착되지 않는다. 저온에 대한 전형적인 화학식에서 질산변형 인산염 피복제는 33중량%의 P2O5, 8.6중량%의 Al2O3및 58.4중량%의 H2O로 구성된 10ℓ의 인산알루미늄용제, 20lℓ의 희석수, 0.3ℓ의 비이온습윤제 및 1.5ℓ의 HNO3, 즉 상기 결합성분의 총체적을 기준으로하여 5내지 71%의 질산을 말한다. 상기 질산변형 인산염 피복의 조성물을 홈이 형성된 고무로울 또는 펠트로울을 사용하여 로울러 도표방법으로 대체로는 냉간압연강인 전기강에 피복시킬 수 있다. 일차적으로 상기 조성물을 박판용강의 표면에 피복시킨 다음, 박판용강을 가열하여 인산염 피복을 90℃ 내지 130℃ 사이의 박판용강의 온도로 충분한 시간동안 가열하여 수분을 완전히 제거시킴으로써, 상기 피복을 박판용강에 접착되는 단일물질로 경화시킬 수 있다. 상기 접착성 피복은 개개의 층을 전기자성 장치에 사용하기 위해 적층시킬 때 와류 전류 손실을 감소시키며 양호한 중간적층 저항을 부여한다.The aqueous aluminum monophosphate composition consists of 33 to 50% by weight of solids of P 2 O 5 + Al 2 O 3 , wherein materials such as zinc, phosphite and nickel are specifically excluded. But for example
Figure kpo00001
The amount of an effective nonionic wetting agent for steel, which is a substance such as an intermediate ring alkyl group containing a group, may be used up to 1.5% by volume, suitably 0.5 to 1.2% by volume, as is known in the art. If it is 0.5 vol% or less, the steel does not wet or the phosphate crawling agent does not adhere to the steel. In a typical formula for low temperature, the nitrate-modified phosphate coating agent is a 10 L aluminum phosphate solvent consisting of 33 wt% P 2 O 5 , 8.6 wt% Al 2 O 3 and 58.4 wt% H 2 O, 20 l L dilution water, 0.3 L nonionic wetting agent and 1.5 L HNO 3 , ie 5 to 71% nitric acid, based on the total volume of the binding components. The composition of the nitrate-modified phosphate coating may be coated on an electric steel, which is generally cold rolled steel, by a roller diagram method using grooved rubber rolls or felt rolls. The coating is primarily coated on the surface of the sheet steel, and then the sheet steel is heated to heat the phosphate coating to a temperature of the sheet steel between 90 ° C and 130 ° C for a sufficient time to completely remove moisture, thereby coating the sheet steel. It can be cured with a single substance that adheres to it. The adhesive coating reduces eddy current loss and imparts good interlayer resistance when laminating individual layers for use in an electromagnetic device.

상기 질산변형 인산염 피복은 다수의 층으로 사용할 수 있으며 다른 기본인산염 피복제상에 도포 할 수도 있다. "박판용강온도(sheet steel temperature)"란 용어는 열전대 또는 그와 유사한 기구에 의하여 측정된 강 및 피복의 온도를 의미하며, 대체로 오븐의 온도보다는 저온이다. 상기 질산변형 인산염 피복은 경화후, 입방센테메터 당 1 내지 1.5g의 밀도를 가진다. 피복은 경화후 ASTM A-717 프랭크린 시험에서 20ohm cm2/lam 내지 640ohm cm2/lam을 나타내었다. 여기에서 '경화'란 용어는 인산염 피복제가 비점착성 고체 상태로 됨을 의미한다. 경화중 HNO3는 철의 표면활성을 증가시켜 피복과 철 박판용강의 반응을 촉진함으로써 예컨대 인산철을 형성하여 인산알루미늄의 침투를 야기하게 된다.The nitrate modified phosphate coating may be used in multiple layers and may be applied on other basic phosphate coatings. The term " sheet steel temperature " means the temperature of the steel and the cladding measured by thermocouples or similar devices and is generally lower than the temperature of the oven. The nitric acid modified phosphate coating has a density of 1 to 1.5 g per cubic centimeter after curing. The coating exhibited a 20ohm cm 2 / lam to 640ohm cm 2 / lam in lean test ASTM A-717, Frank after curing. The term 'curing' here means that the phosphate coating is in a non-tacky solid state. During hardening, HNO 3 increases the surface activity of iron and promotes the reaction between the coating and the sheet steel, thereby forming iron phosphate, for example, causing the infiltration of aluminum phosphate.

본 발명을 다음의 실시예를 참고로 하여 설명한다.The invention is explained with reference to the following examples.

[실시예]EXAMPLE

질산변형 인산염 피복조성물은 33.1중량%의 P2O5, 8.6중량%의 Al2O3및 58.4중량%의 H2O를 함유하고 25℃에서 점성 40cps, 비중 1.47, 분자량 318(알코퍼스라는 상표로 몬산토 화학회사에 의해 판매된)인 10체적부의 모노인산알루미늄 용제, 20체적부의 부가희석수, 및 농도 71%의 질산 5체적%, 즉 0.05×30체적부=1.5체적부의 질산의 혼합물로 이루어진 질산변형 인산염 피복조성물을 마련하였다. 상기 조성물을 25℃에서 혼합하고, 최종성분으로 산을 서서히 첨가시켰다. 인을 함유한 비이온 중간알킬족 습윤제(빅테웨트 #12라는 상표로 빅터 화학회사에 의해 시판됨) 1체적%를 인산피복 조성물에 첨가하였다. 비교용으로 변형되지 않은 인산염 피복용제를 준비하였으며, 여기에는 HNO3를 제외하고는 변형 인산염 피복용제와 동일성분을 동일량 포함하도록 하였다. 상기 양 피복용제를 압연기로 냉간압연한 전기강에 피복하고 가열하여 경화시킨후 절연성을 측정하였다. 상기 양 피복제를 펀칭한 강재상에 역시 피복하고 중간적층 저항을 측정하였다. 상기 결과는 표 1 및 2에 기재하였다.The nitrate modified phosphate coating composition contains 33.1 wt% P 2 O 5 , 8.6 wt% Al 2 O 3 and 58.4 wt% H 2 O and has a viscosity of 25 cps at 25 ° C., specific gravity of 1.47 and a molecular weight of 318 (trademark Alcophers). 10 volume parts aluminum monophosphate solvent, sold by Monsanto Chemical Co., Ltd., 20 volume parts additional dilution water, and 5 volume% nitric acid concentration 71%, i.e. 0.05 x 30 volume parts = 1.5 volume parts nitric acid mixture. A nitric acid modified phosphate coating composition was prepared. The composition was mixed at 25 ° C. and acid was slowly added as final component. One volume percent of a nonionic intermediate alkyl group wetting agent containing phosphorus (commercially available from Victor Chemical Company under the trademark Victew # 12) was added to the phosphate coating composition. An unmodified phosphate coating solvent was prepared for comparison, except that HNO 3 was included in the same amount as the modified phosphate coating solvent. Both coating solvents were coated on a cold rolled electrical steel by a rolling mill, heated, and cured to measure insulation. Both coatings were also coated on the punched steel and the interlaminar resistance was measured. The results are shown in Tables 1 and 2.

[표 1]TABLE 1

Figure kpo00002
Figure kpo00002

*비교시편* Comparative Psalms

[표 2]TABLE 2

Figure kpo00003
Figure kpo00003

*비교시편* Comparative Psalms

상기 표에서 알 수 있는 바와같이 본 발명의 HNO3의 변형 인산염 피복제의 절연성과 점적률은 비변형 인산염 피복제의 성질을 그대로 유지하지만 경화온도는 약 250℃정도 낮아진다.As can be seen from the above table, the insulation and dripping rate of the HNO 3 modified phosphate coating of the present invention retain the properties of the unmodified phosphate coating, but the curing temperature is lowered by about 250 ° C.

Claims (9)

경화된 절연성 인산염이 피복된 박판용 강부재에 있어서, 상기 피복이 100체적부의 수성인산알루미늄과 1 내지 15체적부의 질산으로 이루어진 수성용제로부터 유도되는 것을 특징으로 하는 절연성 인산염이 피복된 박판용 강부재.A thin sheet steel member coated with cured insulating phosphate, wherein the coating is derived from an aqueous solvent consisting of 100 parts by volume aqueous aluminum phosphate and 1 to 15 parts by volume nitric acid. 제 1 항에 있어서, 수성인산알루미늄이 인산, 알루미나 수화물 및 물의 혼합물인 것을 특징으로 하는 절연성 인산염이 피복된 박판용 강부재.The steel member for thin plate coated with insulating phosphate according to claim 1, wherein the aqueous aluminum phosphate is a mixture of phosphoric acid, alumina hydrate and water. 제 1 또는 2 항에 있어서, 3 내지 8체적부의 질산을 사용하는 것을 특징으로 하는 절연성 인산염이 피복된 박판용 강부재.The steel member for thin plates coated with insulating phosphate according to claim 1 or 2, wherein 3 to 8 parts by volume of nitric acid is used. 제 2 항에 있어서, 수성인산알루미늄이 28 내지 38중량%의 P2O5, 5 내지 12중량%의 Al2O3및 50 내지 70중량%의 H2O로 이루어진 것을 특징으로 하는 절연성 인산염이 피복된 박판용 강부재. 3. The insulating phosphate of claim 2, wherein the aqueous aluminum phosphate consists of 28 to 38 weight percent P 2 O 5 , 5 to 12 weight percent Al 2 O 3 and 50 to 70 weight percent H 2 O. Coated sheet steel member. 제 4 항에 있어서, 수성인산알루미늄이 30 내지 35중량%의 P2O5와 7 내지 10중량%의 Al2O3를 함유하고 있는 것을 특징으로 하는 절연성 인산염 피복제로 피복된 박판용 강부재.The steel sheet for thin plate coated with an insulating phosphate coating according to claim 4, wherein the aqueous aluminum phosphate contains 30 to 35 wt% of P 2 O 5 and 7 to 10 wt% of Al 2 O 3 . 제 1 항 또는 제 2 항에 있어서, 수성용제가 50 내지 400체적부의 부가희석수와, 수성인산알루미늄 및 상기 희석수의 체적을 기준으로 3 내지 12체적%의 질산을 함유하는 것을 특징으로 하는 절연성 인산염이 피복된 박판용 강부재.The insulating solvent according to claim 1 or 2, wherein the aqueous solvent contains 50 to 400 vol. Of added dilution water, aqueous aluminum phosphate and 3 to 12 vol.% Nitric acid based on the volume of the dilution water. Steel sheet for thin plates coated with phosphate. 제 6 항에 있어서, 3 내지 8체적%의 질산을 사용하는 것을 특징으로 하는 절연성 인산염이 피복된 박판용 강부재.The steel member for thin plates coated with insulating phosphate according to claim 6, wherein 3 to 8% by volume of nitric acid is used. 제 6 항에 있어서, 수성용제가 최대 1.5체적%의 습윤제를 함유하는 것을 특징으로 하는 절연성 인산염이 피복된 박판용 강부재.7. The steel sheet for thin plate coated with insulating phosphate according to claim 6, wherein the aqueous solvent contains at most 1.5% by volume of a wetting agent. 제 6 항에 있어서, 100 내지 250체적부의 희석수를 사용하는 것을 특징으로 하는 절연성 인산염이 피복된 박판용 강부재.The steel member for thin plates coated with insulating phosphate according to claim 6, wherein dilution water of 100 to 250 parts by volume is used.
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