WO2016125741A1 - 燃料タンク用鋼板 - Google Patents
燃料タンク用鋼板 Download PDFInfo
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- WO2016125741A1 WO2016125741A1 PCT/JP2016/052912 JP2016052912W WO2016125741A1 WO 2016125741 A1 WO2016125741 A1 WO 2016125741A1 JP 2016052912 W JP2016052912 W JP 2016052912W WO 2016125741 A1 WO2016125741 A1 WO 2016125741A1
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- plating layer
- alloy plating
- chromate
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- chemical conversion
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- C23C22/00—Chemical 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
- C23C22/05—Chemical 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
- C23C22/06—Chemical 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
- C23C22/40—Chemical 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 molybdates, tungstates or vanadates
- C23C22/42—Chemical 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 molybdates, tungstates or vanadates containing also phosphates
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- 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/321—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer with at least one metal alloy layer
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
- B32B15/015—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium the said other metal being copper or nickel or an alloy thereof
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- 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
- C23C22/00—Chemical 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
- C23C22/05—Chemical 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
- C23C22/06—Chemical 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
- C23C22/40—Chemical 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 molybdates, tungstates or vanadates
- C23C22/44—Chemical 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 molybdates, tungstates or vanadates containing also fluorides or complex fluorides
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- 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
- C23C28/3225—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only with at least one zinc-based layer
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- 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/565—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of zinc
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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
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
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- 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
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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
- C25D5/60—Electroplating characterised by the structure or texture of the layers
- C25D5/625—Discontinuous layers, e.g. microcracked layers
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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
- C25D7/00—Electroplating characterised by the article coated
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
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- 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
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/20—Use of solutions containing silanes
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/562—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of iron or nickel or cobalt
Definitions
- the present invention has been made in view of the above problems, and the object of the present invention is to provide a variety of fuel environments containing an organic acid such as deteriorated gasoline and further containing condensed water. Then, it is providing the steel plate for fuel tanks which can implement
- a Zn—Ni alloy plating layer located on one side or both sides of a ground iron, and a chromate-free chemical conversion film located on an upper layer of the Zn—Ni alloy plating layer, the Zn—Ni alloy plating layer comprising: A crack reaching the interface between the Zn-Ni alloy plating layer and the steel sheet from the interface between the Zn-Ni alloy plating layer and the chromate-free conversion coating has a silane coupling.
- Phosphoric acid compounds and / or phosphonic acid compounds, vanadium compounds, and titanium compounds and / or zirconium compounds are those that elute P, V, Ti and / or Zr, respectively, in a corrosive environment and act as corrosion inhibitors. It is. Thereby, the effect as described above is exhibited. Such a corrosion inhibiting effect is particularly effective when P, V, Ti (and / or Zr) are aligned. When the total concentration of each metal equivalent amount of P + V + Ti + Zr in the chemical conversion film is less than 5%, the deteriorated gasoline corrosion resistance is insufficient.
- the amount of adhesion per one side of the Zn—Ni alloy plating layer can be controlled by, for example, the amount of electricity (coulomb amount) when applying the electroplating method, but can also be measured later. is there.
- the method for measuring the amount of adhesion per one side of such a Zn—Ni alloy plating layer is not particularly limited and can be measured by a known measurement method. For example, it can be measured by a gravimetric method or a fluorescent X-ray method. Is possible.
- the weight method is a method of measuring the weight of a plating sample having a defined area, dissolving only the plating layer with hydrochloric acid or the like, and obtaining the adhesion amount from the difference from the weight after dissolution.
- Example 3 The surface to be the inner surface of the fuel tank was produced in the same manner as in Example 1, but the surface to be the outer surface of the fuel tank was variously changed. In Example 81, the outer surface was not coated. In Examples 82 and 83, the plating on the outer surface was completely removed by brush grinding. Thereafter, the predetermined film in Example 82 was applied. In Examples 84 to 88, predetermined amounts of Zn and Ni were again deposited by electroplating on the outer surface from which plating was completely removed by the above method.
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Abstract
Description
上記のような知見に基づき完成された本発明の要旨とするところは、次の通りである。
(2) 前記地鉄の片面は前記Zn-Ni合金めっき層と前記クロメートフリー化成皮膜を有し、前記片面と反対の面は前記Zn-Ni合金めっき層および前記クロメートフリー化成皮膜を有しない、(1)に記載の燃料タンク用鋼板。
(3) 前記Zn-Ni合金めっき層および前記クロメートフリー化成皮膜を有しない面におけるZnおよび/またはNiの付着量が0.01~0.5g/m2である、(2)に記載の燃料タンク用鋼板。
(4) 前記Zn-Ni合金めっき層を断面観察した場合に、前記クラックが100μmの視野あたり5個以上50個以下存在する、(1)~(3)の何れか1項に記載の燃料タンク用鋼板。
(5)前記Zn-Ni合金めっき層を断面観察することで得られる、100μmの視野あたりの前記クラックの個数X個と、前記クロメートフリー化成皮膜中のP+V+Ti+Zrの各金属換算量の合計の濃度Y(%)が、以下の(I)式で表わされる関係を満足する、(1)~(4)の何れか1項に記載の燃料タンク用鋼板。
Y≧-0.06X+6.8 ・・・(I)
(6)前記Zn-Ni合金めっき層を断面観察した場合に、前記クラックが100μmの視野あたり5個以上50個未満存在し、かつ、クラックの最大幅が0.5μm未満である、(5)に記載の燃料タンク用鋼板。
Zn-Ni合金めっき層にクラックを有しない鋼板は、プレス加工等によって表面の皮膜及びめっき層に損傷を受ける。そうすると、疵部の地鉄が露出し、めっき層の犠牲防食作用だけでは十分ではなく、腐食が進行する。一方、本発明の鋼板は、プレス加工等によって表面の皮膜及びめっき層に損傷を受けて、疵部の地鉄が露出するが、めっき層クラックに侵入した化成皮膜が露出した地鉄近傍に存在しており、後述するように本発明の化成皮膜中からは腐食抑制作用のある特定の物質が溶出して地鉄を保護するため、顕著に腐食を抑制することが可能となる。
クロメートフリー化成皮膜は、シランカップリング剤の重縮合物からなる有機ケイ素化合物と、(i)リン酸化合物及び/又はホスホン酸化合物と、(ii)バナジウム化合物と、(iii)チタン化合物及び/又はジルコニウム化合物と、からなるものである。ここで、かかる化成皮膜の片面当たりのP+V+Ti+Zrの各金属換算量の合計の濃度(より詳細には、片面当たりの化成皮膜全体の固形分質量に対する、上記(i)~(iii)の化合物の各金属換算量の合計質量)は、5質量%以上20質量%以下であることが必要である。
かかるクラックの存在は、サンプルを樹脂埋めした後、断面垂直研磨を行い、断面SEM観察を行うことで確認することができる。この際、1000倍程度の倍率で、100μmの視野を観察し、めっき表層から地鉄に達するクラックが、5個以上50個以下存在することがより好ましい。例えば100μmの視野でのクラック数が5個未満のように、クラックが少ない場合には、燃料耐食性が低下する傾向にある。一方、例えば100μmの視野でのクラック数が50個超過のように、クラックが多すぎる場合には、塩水環境のような一般的な耐食性が低下する傾向にある。本実施形態に係るZn-Ni合金めっき層において、100μmの視野でのクラックの個数は、より好ましくは、10個以上40個以下である。
(実施例1~27及び比較例1~6)
極低炭素鋼板を原板とし、硫酸酸性めっき浴を用い、電気めっきによって、片面当たりの付着量が15g/m2であり、Ni10質量%のZn-Ni合金めっき層を形成し、めっき浴中で通電を切って3秒間保持することで、所定のめっき層クラックを形成した。なお、使用した硫酸酸性めっき浴は、硫酸Zn七水和物:200g/L、硫酸Ni六水和物:380g/L、硫酸Na:80g/L、硫酸:10g/Lからなる50℃の浴である。その後、表1に示すベース皮膜に、リン酸化合物及び/又はホスホン酸化合物と、バナジウム化合物と、チタン化合物及び/又はジルコニウム化合物と、を表2に示す配合で含有させた種々のクロメートフリー化成皮膜を、得られたZn-Ni合金めっき層の上層に所定量形成した。クロメートフリー化成皮膜の形成は、バーコーターによる塗布と熱風乾燥炉による焼付け(到達板温100℃)により行った。なお、クロメートフリー化成皮膜の付着量及びP+V+Ti+Zrの各金属換算量の合計の濃度は、上記の蛍光X線法により測定した。
Zn-Ni合金めっき後に、めっき浴中無通電浸漬処理を行わなかった以外は上記と同様にして、作製した。
作製したサンプルを樹脂埋めした後、断面垂直研磨を実施して、断面SEM観察を行った。1000倍の倍率で、100μmの視野を観察し、めっき表層から地鉄に達するクラックの数を計測した。また、上記視野中でめっき表層から地鉄に達するクラックの中で最も開口幅の大きなクラックを10000倍でSEM観察し、最大幅を計測した。
作製したサンプルを、燃料タンクを模擬して内径50mm、深さ35mmの円筒状に成形し、脱脂処理で油を除去した後、内面底にカッターで地鉄に達する疵をつけた(プレス加工での疵入りを模擬)。その後、劣化ガソリンを模擬した試験液(蟻酸100ppm、酢酸300ppm、塩化物イオン100ppm、水1.0容量%を含有するガソリン)を封入し、40℃で2ヶ月間保持した後、錆除去を行い、腐食による最大板厚減少値(mm)を測定した。
サンプルの裏面、エッジをシールし、JISZ2371に規定された塩水噴霧試験を72時間行い、白錆発生面積率(%)を計測した。
一方、比較例1,2,3は、本発明のクロメートフリー化成皮膜の構成要件である、P、V、Ti(及び/又はZr)のいずれかを含まず、劣化ガソリン耐食性、SST耐食性とも劣っていた。また、P、V、Ti(及び/又はZr)を含んでいても、その合計濃度が本発明の下限値未満の場合(比較例4)には、劣化ガソリン耐食性が劣り、また、上限値超過の場合(比較例5)には、劣化ガソリン耐食性に加えてSST耐食性も劣っていた。有機樹脂を主体とする皮膜(比較例6)においても、劣化ガソリン耐食性が劣っていた。また、Zn-Ni合金めっき層がクラックを有しない場合(比較例7~10)も劣化ガソリン耐食性が劣っていた。なお、本発明のクロメートフリー化成皮膜の構成要件を満たさない例においては、Zn-Ni合金めっき層がクラックを有する場合の方が劣化ガソリン耐食性、SST耐食性ともに低下する傾向であった(比較例3と8、4と9、6と10の比較)。
(実施例28~80)
極低炭素鋼板を原板とし、硫酸酸性めっき浴を用い、電気めっきによって、片面当たりの付着量が15g/m2であり、Ni10質量%のZn-Ni合金めっき層を形成し、めっき浴中で通電を切って浸漬する際の温度、時間を種々変更し、所定のめっき層クラックを形成した。めっき浴は、上記実験例1と同じものを用い、温度は50~65℃、浸漬時間は1秒~5秒の間で変更した。その後、表2に示す種々の組成のクロメートフリー化成皮膜を、上記実験例1と同様にして、所定量形成した。また、クロメートフリー化成皮膜の付着量及びP+V+Ti+Zrの各金属換算量の合計の濃度は、上記の蛍光X線法により測定した。
特に、劣化ガソリン耐食性に関しては、(I)式を満たすものは、板厚減少が0であり、特に優れた劣化ガソリン耐食性を示した。また、クラック幅が0.5μm未満では、SST耐食性での白錆発生率が1%未満であり、優れたSST耐食性を示した。特に、クラック幅が0.5μm未満でクラック数が50個未満では、いずれの条件でもSST耐食性での白錆発生率がゼロであり、特に優れていた。
(実施例81~88)
燃料タンクの内面になる面は実施例1と同様に作製したが、燃料タンクの外面になる面は種々変更した。実施例81では外面に皮膜を施さなかった。実施例82,83は、外面になる面のめっきをブラシ研削によって完全に除去した。その後実施例82での所定の皮膜を塗布した。実施例84~88は、前記方法で完全にめっきを除去した外面に、再度、電気めっきによって所定の付着量のZn、Niを付着させた。
(塗装性)
燃料タンクの外面になる面の塗装性を評価した。通常、自動車または二輪車用の燃料タンク外面用の塗装前処理(りん酸亜鉛処理)および電着塗装を行い、その外観を目視判定した。許容レベルのものを○、極めて均一美麗な場合を「◎」と評価した。
作製したサンプルに、防錆油(パーカー興産Noxrust530)を極薄塗油(約0.1g/m2)した後、コイル状態を模擬して内面になる面と外面になる面とが接するように重ねて梱包した。50℃98%RH環境下で1か月保管したサンプルを用いて、前述の塗装性評価と同じ塗装を行い、同じ基準で評価した。
内面になる面同士が内側になる様に合せてシーム溶接を行い、溶接電流を変化させて、適正なナゲットが得られる電流の範囲を求めた。条件は以下のとおりである。
・電極:Cu-Cr合金、中央部が15mmRの4.5mm幅、端部が4mmRの幅8mmの断面を有する円盤状電極
・溶接方法:二重かさね、ラップシーム溶接
・加圧力:400kgf(なお、1kgfは、約9.8Nである)
・通電時間:2/50秒通電on、1/50秒通電off
・冷却:内部水冷、および外部水冷
・溶接スピード:2.5m/分
Claims (6)
- 地鉄の片面または両面に位置するZn-Ni合金めっき層と、
前記Zn-Ni合金めっき層の上層に位置するクロメートフリー化成皮膜と、
を備え、
前記Zn-Ni合金めっき層は、当該Zn-Ni合金めっき層と前記クロメートフリー化成皮膜との界面から、前記Zn-Ni合金めっき層と前記鋼板との界面に達するクラックを有しており、
前記クロメートフリー化成皮膜は、シランカップリング剤の重縮合物からなる有機ケイ素化合物と、リン酸化合物及び/又はホスホン酸化合物と、バナジウム化合物と、チタン化合物及び/又はジルコニウム化合物とからなり、
前記クロメートフリー化成皮膜の片面当たりにおける、前記リン酸化合物及び/又はホスホン酸化合物+前記バナジウム化合物+前記チタン化合物及び/又はジルコニウム化合物の各金属換算量の合計の濃度が、5質量%以上20質量%以下である、燃料タンク用鋼板。 - 前記地鉄の片面は前記Zn-Ni合金めっき層と前記クロメートフリー化成皮膜を有し、前記片面と反対の面は前記Zn-Ni合金めっき層および前記クロメートフリー化成皮膜を有しない、請求項1に記載の燃料タンク用鋼板。
- 前記Zn-Ni合金めっき層および前記クロメートフリー化成皮膜を有しない面におけるZnおよび/またはNiの付着量が0.01~0.5g/m2である、請求項2に記載の燃料タンク用鋼板。
- 前記Zn-Ni合金めっき層を断面観察した場合に、前記クラックが100μmの視野あたり5個以上50個以下存在する、請求項1~3の何れか1項に記載の燃料タンク用鋼板。
- 前記Zn-Ni合金めっき層を断面観察することで得られる、100μmの視野あたりの前記クラックの個数X個と、前記クロメートフリー化成皮膜中のP+V+Ti+Zrの各金属換算量の合計の濃度Y(%)が、以下の(I)式で表わされる関係を満足する、請求項1~4の何れか1項に記載の燃料タンク用鋼板。
Y≧-0.06X+6.8 ・・・(I) - 前記Zn-Ni合金めっき層を断面観察した場合に、前記クラックが100μmの視野あたり5個以上50個未満存在し、かつ、クラックの最大幅が0.5μm未満である、請求項5に記載の燃料タンク用鋼板。
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US15/546,886 US10697067B2 (en) | 2015-02-03 | 2016-02-01 | Steel sheet for a fuel tank |
JP2016533733A JP6044748B1 (ja) | 2015-02-03 | 2016-02-01 | 燃料タンク用鋼板 |
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KR102115412B1 (ko) * | 2018-02-02 | 2020-05-27 | 한국전력공사 | 열기관의 연소 코팅용 조성물, 연소 연료 조성물 및 이를 이용한 열기관의 연소 코팅 방법 |
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EP3239359A4 (en) | 2018-08-15 |
KR20170099998A (ko) | 2017-09-01 |
KR101958129B1 (ko) | 2019-03-13 |
TW201638389A (zh) | 2016-11-01 |
CN107208278A (zh) | 2017-09-26 |
MX2017008001A (es) | 2017-09-28 |
CN107208278B (zh) | 2019-06-21 |
US10697067B2 (en) | 2020-06-30 |
EP3239359A1 (en) | 2017-11-01 |
JP6044748B1 (ja) | 2016-12-14 |
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US20180002813A1 (en) | 2018-01-04 |
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BR112017011835A2 (pt) | 2017-12-26 |
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