KR20200103923A - Method of removing hydrogen brittleness for metal surface - Google Patents

Method of removing hydrogen brittleness for metal surface Download PDF

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KR20200103923A
KR20200103923A KR1020190021983A KR20190021983A KR20200103923A KR 20200103923 A KR20200103923 A KR 20200103923A KR 1020190021983 A KR1020190021983 A KR 1020190021983A KR 20190021983 A KR20190021983 A KR 20190021983A KR 20200103923 A KR20200103923 A KR 20200103923A
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plated
degreasing
hydrogen embrittlement
plating
metal surface
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KR1020190021983A
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Korean (ko)
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이오선
안태영
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동아플레이팅 주식회사
동명대학교산학협력단
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Priority to KR1020190021983A priority Critical patent/KR20200103923A/en
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

The present invention relates to a method of removing hydrogen brittleness of a metal surface. The method of removing hydrogen brittleness of a metal surface comprises: a preprocessing step in which contaminants remaining on the surface of an object to be plated are removed; a plating step in which the surface of the object to be plated which has undergone the preprocessing step is plated; a hydrogen brittleness removal step in which hydrogen brittleness formed on the surface of the object to be plated which has undergone the plating step is removed; and a postprocessing step of chemically passivating the surface of the object to be plated which has undergone the hydrogen brittleness removal step to improve appearance and corrosion resistance. The present invention removes hydrogen created on a metal surface to prevent product fractures, and improves the plating quality of the metal surface to extend the life of the product.

Description

금속표면의 수소취성 제거방법 {METHOD OF REMOVING HYDROGEN BRITTLENESS FOR METAL SURFACE}Method of removing hydrogen embrittlement from metal surface {METHOD OF REMOVING HYDROGEN BRITTLENESS FOR METAL SURFACE}

본 발명은, 도금공정 등에서 금속표면에 발생하는 수소를 제거하여, 금속표면의 도금품질을 향상시키는 금속표면의 수소취성 제거방법에 관한 것이다.The present invention relates to a method for removing hydrogen embrittlement from a metal surface by removing hydrogen generated on a metal surface during a plating process or the like, thereby improving the plating quality of the metal surface.

일반적으로, 수소취성(Hydrogen Embrittlement)은 음극 전해탈지, 산세척, 전기도금 과정에서 생성된 수소가 금속, 특히 철강제품에 침투함으로써 금속의 격자에 변화를 초래하여 결정이 약해지도록 하는 현상으로서, 수소취성에 의하여 강철 등 금속재료의 약화가 일어나면 큰 기계나 구조물이 변형 또는 파괴되는 등의 심각한 안전사고의 원인이 되는 것으로 알려진다.In general, Hydrogen Embrittlement is a phenomenon in which hydrogen generated in the process of cathodic electrolytic degreasing, pickling, and electroplating penetrates into metals, especially steel products, causing a change in the lattice of the metal to weaken the crystal. It is known that the weakening of metal materials such as steel due to brittleness can cause serious safety accidents such as deformation or destruction of large machines or structures.

이에 따라 도금제품의 수소취성을 방지하기 위하여 다양한 방법이 도입되고 있는바, 수소취성이 발생되기 전에는 전해탈지의 경우 철강재는 양극탈지방식을 선택하여 수행하고, 산처리를 할 때에는 되도록 짧은 시간 안에 산세척함과 동시에 산억제제(Inhibitor)를 첨가하는 방식이 적용된다.Accordingly, various methods have been introduced to prevent the hydrogen embrittlement of plated products.Before the occurrence of hydrogen embrittlement, in the case of electrolytic degreasing, the anode degreasing method is selected for the steel material. At the same time as washing, an acid inhibitor is added.

또한, 수소취성이 발생 된 이후에는, 자동차 표준 온도 및 시간에 따라 수소취성제거로에서 열처리하여 금속 입계간 잔류해 있는 수소가스를 제거하는 방식이 적용된다.In addition, after the occurrence of hydrogen embrittlement, a method of removing hydrogen gas remaining between metal grain boundaries by heat treatment in a hydrogen embrittlement removal furnace according to the vehicle standard temperature and time is applied.

그러나, 상기와 같은 종래의 수소취성제거로는 배치(batch)타입으로, 상기 수소취성제거로에서는 작업자가 수동으로 수소취성을 제거하게 되므로, 작업효율이 낮다는 문제점이 있었다.However, since the conventional hydrogen embrittlement removal furnace as described above is of a batch type, and the operator manually removes the hydrogen embrittlement in the hydrogen embrittlement removal furnace, there is a problem that the work efficiency is low.

대한민국, 등록번호 제10-1316420호Republic of Korea, registration number 10-1316420

이에 따라, 본 발명은 이를 해결하고자 안출된 것으로, 본 발명은, 금속표면에 발생된 수소를 제거하는 수소취성 제거단계를 자동화하여, 작업효율이 향상되는 금속표면의 수소취성 제거방법을 제공하고자 하는 것이다.Accordingly, the present invention was conceived to solve this, and the present invention is to provide a method for removing hydrogen embrittlement from a metal surface to improve work efficiency by automating the hydrogen embrittlement removal step of removing hydrogen generated on the metal surface. will be.

본 발명은 금속표면의 수소취성 제거방법에 관한 것으로, 상기 금속표면의 수소취성 제거방법은, 피도금물 표면에 잔류하는 오염물이 제거되는 전처리단계와, 상기 전처리단계를 거친 피도금물의 표면에 도금이 되는 도금단계와, 상기 도금단계를 거친 피도금물의 표면에 형성된 수소취성이 제거되는 수소취성 제거단계와, 상기 수소취성 제거단계를 거친 피도금물의 표면에 화학적으로 부동태화하여 외관 및 내식성을 향상시키는 후처리단계를 포함하는 것을 특징으로 한다.The present invention relates to a method for removing hydrogen embrittlement from a metal surface, wherein the method for removing hydrogen embrittlement from a metal surface includes a pretreatment step in which contaminants remaining on the surface of a plated object are removed, and a surface of the object to be plated through the pretreatment step. The plating step to be plated, the hydrogen embrittlement removal step of removing the hydrogen embrittlement formed on the surface of the object to be plated through the plating step, and the surface of the object to be plated through the hydrogen embrittlement removal step are chemically passivated to provide appearance and It characterized in that it comprises a post-treatment step to improve the corrosion resistance.

또한, 상기 전처리단계는, 탈지액이 저장된 탱크 속에 피도금물이 침지되어 표면의 오염물이 제거되는 침적탈지단계와, 상기 침적탈지단계를 거친 피도금물이 탈지액에 침지되어 초음파 진동에 의해 탈지되는 초음파탈지단계와, 상기 초음파탈지단계를 거친 피도금물이 산용액에 침지되어 표면의 산화물이 제거되는 산처리단계와, 상기 산처리단계를 거친 피도금물이 산성 용액에 전해탈지되는 산전해탈지단계와, 상기 산전해탈지단계를 거친 피도금물이 알칼리성 용액에 전해탈지되는 알칼리전해탈지단계를 포함하는 것을 특징으로 한다.In addition, the pretreatment step includes an immersion degreasing step in which the object to be plated is immersed in a tank in which the degreasing liquid is stored to remove contaminants from the surface, and the object to be plated that has undergone the immersion degreasing step is immersed in the degreasing liquid and degreasing by ultrasonic vibration. An ultrasonic degreasing step that is performed, an acid treatment step in which the plated object that has undergone the ultrasonic degreasing step is immersed in an acid solution to remove oxides on the surface, and the acid electrolysis in which the plated object that has undergone the acid treatment step is electrolytically degreased in an acidic solution. It characterized in that it comprises a degreasing step, and an alkaline electrolytic degreasing step of electrolytic degreasing the object to be plated through the acid electrolytic degreasing step in an alkaline solution.

따라서 본 발명은, 금속표면에 발생하는 수소를 제거하여 제품의 파단을 방지하고, 금속표면의 도금 품질을 향상시켜 제품의 수명을 연장시키는 현저한 효과가 있다. Accordingly, the present invention has a remarkable effect of removing hydrogen generated on a metal surface to prevent breakage of a product, and improving the plating quality of the metal surface to extend the life of the product.

도1은 본 발명의 금속표면의 수소취성 제거방법의 흐름도이다.
도2는 본 발명에 따른 전처리단계의 흐름도이다.1 is a flow chart of a method for removing hydrogen embrittlement from a metal surface according to the present invention.
2 is a flowchart of a preprocessing step according to the present invention.

이하, 본 발명의 기술적 사상을 첨부된 도면을 사용하여 더욱 구체적으로 설명한다.Hereinafter, the technical idea of the present invention will be described in more detail using the accompanying drawings.

첨부된 도면은 본 발명의 기술적 사상을 더욱 구체적으로 설명하기 위하여 도시한 일례에 불과하므로 본 발명의 기술적 사상이 첨부된 도면의 형태에 한정되는 것은 아니다.The accompanying drawings are only examples shown to describe the technical idea of the present invention in more detail, so the technical idea of the present invention is not limited to the form of the accompanying drawings.

도1은 본 발명의 금속표면의 수소취성 제거방법의 흐름도이다.1 is a flow chart of a method for removing hydrogen embrittlement from a metal surface according to the present invention.

도1에 도시된 바와 같이, 본 발명에 따른 금속표면의 수소취성 제거방법은, 전처리단계(S100), 도금단계(S200), 수소취성제거단계(S300), 후처리단계(S400)를 포함한다.As shown in Fig. 1, the method for removing hydrogen embrittlement from a metal surface according to the present invention includes a pretreatment step (S100), a plating step (S200), a hydrogen embrittlement removal step (S300), and a post-treatment step (S400). .

상기 전처리단계(S100)는 피도금물에 도금을 하기 위해 상기 피도금물 표면에 잔류하는 오염물을 제거하는 단계이다.The pretreatment step (S100) is a step of removing contaminants remaining on the surface of the object to be plated in order to plate the object to be plated.

도2에 도시된 바와 같이, 본 발명의 전처리단계(S100)는, 침절탈지단계(S110), 초음파탈지단계(S120), 산처리단계(S130), 산전해탈지단계(S140), 알칼리전해탈지단계(S150)를 포함한다.As shown in Figure 2, the pretreatment step (S100) of the present invention, acupuncture degreasing step (S110), ultrasonic degreasing step (S120), acid treatment step (S130), acid electrolytic degreasing step (S140), alkaline electrolytic degreasing step It includes step S150.

먼저, 피도금물은 침적탈지단계(S110)를 거치는 것으로, 상기 침적탈지단계(S110)는 피도금물의 표면에 잔류하는 오염물을 제거하기 위한 공정이다. First, the object to be plated is subjected to an immersion degreasing step (S110), and the immersion degreasing step (S110) is a process for removing contaminants remaining on the surface of the object to be plated.

상기 침적탈지단계(S110)에서, 상기 피도금물은 탈지액이 저장된 탱크 속에 침지되어, 상기 피도금물의 표면에 부착된 오염물이 화학적, 물리적 작용에 의하여 제거되어지도록 한다.In the immersion degreasing step (S110), the object to be plated is immersed in a tank in which the degreasing liquid is stored, so that the contaminants attached to the surface of the object to be plated are removed by chemical and physical actions.

그 다음, 상기 침적탈지단계(S110)를 거친 피도금물은 바렐에 의해 이동되어, 초음파탈지단계(S120)를 거치게 되는 것으로, 상기 초음파탈지단계(S120)는 상기 피도금물이 탈지액에 침치되되, 상기 탈지액이 초음파에 의해 진동되어 피도금물의 표면을 탈지하게되는 단계이다.Then, the plated object that has passed through the immersion degreasing step (S110) is moved by a barrel and undergoes an ultrasonic degreasing step (S120). In the ultrasonic degreasing step (S120), the object to be plated is immersed in the degreasing solution. However, this is a step in which the degreasing liquid is vibrated by ultrasonic waves to degrease the surface of the object to be plated.

이후, 상기 초음파탈지단계(S120)를 거친 피도금물은 바렐에 의해 산처리조로 이송되어 산처리단계(S130)를 거치게되며, 상기 산처리단계(S130)는 산의 수용액속에 피도금물을 침지시켜 표면을 세정함으로써, 표면의 산화물 및 이물질을 제거하는 단계이다.Thereafter, the plated product that has undergone the ultrasonic degreasing step (S120) is transferred to an acid treatment tank by a barrel and undergoes an acid treatment step (S130), and the acid treatment step (S130) is performed by immersing the plated product in an aqueous solution of acid. It is a step of removing oxides and foreign substances from the surface by cleaning the surface by using the filter.

다음으로, 상기 산처리단계(S130)에 의해 산처리된 피도금물은 바렐에 의해 산전해탈지조로 이송되어 산전해탈지단계(S140)를 거치게 된다.Next, the object to be plated acid-treated by the acid treatment step (S130) is transferred to the prenatal degreasing tank by means of a barrel to undergo the prenatal degreasing step (S140).

상기 산전해탈지단계(S140)란, 산성 용액을 사용하여 피도금물의 표면에 부착되어있는 유지막을 기계적으로 파괴하여 탈지하는 공정이다.The acid electrolytic degreasing step (S140) is a process of mechanically destroying and degreasing the retention film attached to the surface of the object to be plated using an acidic solution.

마지막으로, 상기 산전해탈지단계(S140)를 거친 피도금물은 알칼리전해탈지조로 이송되어 알칼리전해탈지단계(S150)를 거치게되는 것으로, 상기 알칼리전해탈지단계(S150)는 알칼리성 용액을 사용하여 피도금물의 표면에 부착되어있는 유지막을 기계적으로 파괴하여 탈지하는 방법이다.Finally, the plated product that has passed through the acid electrolytic degreasing step (S140) is transferred to an alkali electrolytic degreasing tank and undergoes an alkaline electrolytic degreasing step (S150), and the alkaline electrolytic degreasing step (S150) is performed using an alkaline solution. It is a method of degreasing by mechanically destroying the retaining film attached to the surface of the plated object.

그리고 상기 침절탈지단계(S110), 초음파탈지단계(S120), 산처리단계(S130), 산전해탈지단계(S140), 알칼리전해탈지단계(S150) 사이에는, 상기 피도금물이 수세조로 이송되어 세척되어지는 수세공정이 포함되어 지는 것이 바람직하다.And between the sedimentation and degreasing step (S110), ultrasonic degreasing step (S120), acid treatment step (S130), acid electrolytic degreasing step (S140), and alkaline electrolytic degreasing step (S150), the plated material is transferred to a washing tank. It is preferable to include a washing process that is washed.

상기 전처리단계(S100)를 거친 피도금물은, 표면에 도금이 되는 도금단계(S200)를 거치게된다.The object to be plated that has passed through the pretreatment step (S100) is subjected to a plating step (S200) in which the surface is plated.

상기 도금단계(S200)에서는 피도금물의 표면에 미관, 부식방지 및 기타의 전기적, 전자적, 마모 방지 및 기타의 물리적 및 화학적 성능 향상을 위하여 금속을 입히는 것으로, 도금방법으로는 용융도금법, 전기도금법 등이 있다. In the plating step (S200), a metal is coated on the surface of the object to be plated for aesthetics, corrosion prevention, and other electrical, electronic, abrasion prevention, and other physical and chemical performance improvement, and the plating method is a hot dip plating method or an electroplating method. Etc.

본 발명에서는 실시례로서, 상기 피도금물에 전기아연도금을 한다.In the present invention, as an example, the object to be plated is electrozinc plating.

상기 수소취성 제거단계(S300)는, 상기 도금단계를 거쳐, 표면에 수소가 형성된 금속표면의 수소를 제거하는 단계이다.The hydrogen embrittlement removing step (S300) is a step of removing hydrogen from a metal surface having hydrogen formed thereon through the plating step.

상기 수소취성이란, 도금공정 내에서 발생하는 수소가 금속격자사이에 뚫고 들어가 금속격자 입계간의 갈라짐을 만들어 부품의 파단을 발생시키는 현상을 뜻하며, 상기 수소취성 제거단계(S300)에서, 상기 피도금물은 대략 200℃의 온도에서 4시간 정도 베이킹되어 수소취성이 제거되어진다.The hydrogen embrittlement refers to a phenomenon in which hydrogen generated in the plating process penetrates between the metal grids and creates a crack between the metal grid grain boundaries to cause fracture of the part.In the hydrogen embrittlement removal step (S300), the coating The gold water is baked at a temperature of about 200°C for about 4 hours to remove hydrogen embrittlement.

마지막으로, 상기 후처리단계(S400)는 상기 수소취성 제거단계를 거친 피도금물의 표면에 화학적으로 부동태처리를 하여 외관 및 내식성을 향상시키는 단계이다.Finally, the post-treatment step (S400) is a step for improving appearance and corrosion resistance by chemically passivating the surface of the object to be plated that has undergone the hydrogen embrittlement removal step.

상기 후처리단계에서는, 상기 피도금물에 크로메이트 처리를 하여, 상기 피도금물의 내식성을 향상시키게 된다.In the post-treatment step, the object to be plated is subjected to a chromate treatment to improve corrosion resistance of the object to be plated.

이상과 같이 본 발명을 도면에 도시한 실시례를 참고하여 설명하였으나, 이는 발명을 설명하기 위한 것일 뿐이며, 본 발명이 속하는 기술 분야의 통상의 지식을 가진 자라면 발명의 상세한 설명으로부터 다양한 변형 또는 균등한 실시례가 가능하다는 것을 이해할 수 있을 것이다. As described above, the present invention has been described with reference to the embodiments shown in the drawings, but this is only for describing the invention, and for those of ordinary skill in the art to which the present invention belongs, various modifications or equivalents from the detailed description of the invention It will be appreciated that one embodiment is possible.

따라서 본 발명의 진정한 권리범위는 특허청구범위의 기술적 사상에 의해 결정되어야 한다.Therefore, the true scope of the present invention should be determined by the technical idea of the claims.

S100:전처리단계
S110:침적탈지단계
S120:초음파탈지단계
S130:산처리단계
S140:산전해탈지단계
S150:알칼리전해탈지단계
S200:도금단계
S300:수소취성제거단계
S400:후처리단계S100: pretreatment step
S110: immersion degreasing step
S120: Ultrasonic degreasing step
S130: acid treatment step
S140: prenatal degreasing step
S150: alkaline electrolytic degreasing step
S200: Plating step
S300: Hydrogen embrittlement removal step
S400: post-processing step

Claims (2)

피도금물 표면에 잔류하는 오염물이 제거되는 전처리단계;
상기 전처리단계를 거친 피도금물의 표면에 도금이 되는 도금단계;
상기 도금단계를 거친 피도금물의 표면에 형성된 수소취성이 제거되는 수소취성 제거단계;
상기 수소취성 제거단계를 거친 피도금물의 표면에 화학적으로 부동태화하여 외관 및 내식성을 향상시키는 후처리단계;를 포함하는 것을 특징으로 하는 금속표면의 수소취성 제거방법.
A pretreatment step in which contaminants remaining on the surface of the object to be plated are removed;
A plating step of plating the surface of the object to be plated through the pretreatment step;
A hydrogen embrittlement removing step in which the hydrogen embrittlement formed on the surface of the object to be plated through the plating step is removed;
And a post-treatment step of improving appearance and corrosion resistance by chemically passivating the surface of the object to be plated through the hydrogen embrittlement removing step.
제1항에 있어서,
상기 전처리단계는,
탈지액이 저장된 탱크 속에 피도금물이 침지되어 표면의 오염물이 제거되는 침적탈지단계;
상기 침적탈지단계를 거친 피도금물이 탈지액에 침지되어 초음파 진동에 의해 탈지되는 초음파탈지단계;
상기 초음파탈지단계를 거친 피도금물이 산용액에 침지되어 표면의 산화물이 제거되는 산처리단계;
상기 산처리단계를 거친 피도금물이 산성 용액에 전해탈지되는 산전해탈지단계;
상기 산전해탈지단계를 거친 피도금물이 알칼리성 용액에 전해탈지되는 알칼리전해탈지단계;를 포함하는 금속표면의 수소취성 제거방법.The method of claim 1,
The pretreatment step,
An immersion degreasing step in which the object to be plated is immersed in the tank in which the degreasing liquid is stored to remove contaminants from the surface;
An ultrasonic degreasing step in which the object to be plated through the immersion degreasing step is immersed in a degreasing liquid and degreased by ultrasonic vibration;
An acid treatment step in which the object to be plated through the ultrasonic degreasing step is immersed in an acid solution to remove oxides on the surface;
An acid electrolytic degreasing step of electrolytically degreasing the object to be plated through the acid treatment step in an acidic solution;
Alkaline electrolytic degreasing step of electrolytic degreasing of the object to be plated through the acid electrolytic degreasing step in an alkaline solution.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101316420B1 (en) 2011-10-04 2013-10-08 주식회사 포스코 Hydrogen treating device for analysis of hydrogen brittleness of steel member

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101316420B1 (en) 2011-10-04 2013-10-08 주식회사 포스코 Hydrogen treating device for analysis of hydrogen brittleness of steel member

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