JPS6376882A - Pretreatment for organic coating and pretreating liquid - Google Patents
Pretreatment for organic coating and pretreating liquidInfo
- Publication number
- JPS6376882A JPS6376882A JP21884786A JP21884786A JPS6376882A JP S6376882 A JPS6376882 A JP S6376882A JP 21884786 A JP21884786 A JP 21884786A JP 21884786 A JP21884786 A JP 21884786A JP S6376882 A JPS6376882 A JP S6376882A
- Authority
- JP
- Japan
- Prior art keywords
- chromic acid
- oxide particles
- coating
- water
- steel material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 50
- 239000011248 coating agent Substances 0.000 title claims abstract description 48
- 239000007788 liquid Substances 0.000 title claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 67
- 239000010959 steel Substances 0.000 claims abstract description 67
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims abstract description 43
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000002245 particle Substances 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 39
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910000410 antimony oxide Inorganic materials 0.000 claims abstract description 21
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 19
- 239000000126 substance Substances 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 11
- 230000001603 reducing effect Effects 0.000 claims abstract description 6
- 238000011282 treatment Methods 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 15
- 239000003638 chemical reducing agent Substances 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 18
- 230000007797 corrosion Effects 0.000 abstract description 13
- 239000000758 substrate Substances 0.000 abstract 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 24
- 239000010410 layer Substances 0.000 description 22
- -1 polyethylene Polymers 0.000 description 20
- 239000004698 Polyethylene Substances 0.000 description 19
- 239000002585 base Substances 0.000 description 19
- 229920000573 polyethylene Polymers 0.000 description 18
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 9
- 150000003839 salts Chemical class 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000004381 surface treatment Methods 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000005422 blasting Methods 0.000 description 3
- 238000004210 cathodic protection Methods 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 235000011187 glycerol Nutrition 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000006166 lysate Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
Landscapes
- Chemical Treatment Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
′ この発明は、パイプライン、配管用鋼管の内外面
、鋼管杭、鋼矢板、鉄筋等の構造物用鋼材の１［ｊ防食
有機被覆用下地処理方法および下地処理液に関する。[Detailed Description of the Invention] <Industrial Field of Application> ′ This invention is directed to the application of anti-corrosion organic coating for steel materials for structures such as pipelines, the inner and outer surfaces of steel pipes for piping, steel pipe piles, steel sheet piles, and reinforcing bars. The present invention relates to a base treatment method and a base treatment liquid.
〈従来技術とその問題点〉
従来よりの有機被覆用下地処理技術をポリエチレン被覆
鋼管を例にとって説明する。<Prior art and its problems> Conventional surface treatment technology for organic coating will be explained using a polyethylene coated steel pipe as an example.
ポリエチレンを鋼面へ接着するには、外層の防食用ポリ
エチレンと、プラスト処理あるいは酸洗等で清浄化した
鋼面との間に、無水マレイン酸等を導入して修飾変性し
たポリエチレン層を挟んで、加熱圧着しているが、それ
だけでは、被（Ｖ端部や庇部からの剥離が起こり易く、
腐食部位が被覆層下深くまで広がってしまう。これに対
処するために、接着性の変性ポリエチレンと鋼面との密
着性を高める目的で、銅に対しリン酸塩処理、クロメー
ト処理等の化成処理を施すことが検討されて来た。To bond polyethylene to a steel surface, a layer of polyethylene that has been modified by introducing maleic anhydride or the like is sandwiched between the outer layer of anticorrosion polyethylene and the steel surface that has been cleaned by plasting or pickling. , heat and pressure bonding is used, but with that alone, peeling from the V end and eaves is likely to occur;
The corrosion area spreads deep beneath the coating layer. In order to cope with this problem, it has been considered to subject copper to chemical conversion treatments such as phosphate treatment and chromate treatment in order to improve the adhesion between the adhesive modified polyethylene and the steel surface.
その中で、クロメート処理が比較的優れ、クロム酸と共
に、シリカあるいはアルミナのゾル（特開昭５７−１６
９０９２号他）やリジ酸塩（特公昭５５−３５０６９号
他）等含有効成分として含有するものが使用されてきた
が、これらは、元来、亜鉛メッキ鋼板等の防錆あるいは
化粧鋼板、自動車用鋼板の塗装下地処理用に開発された
もので、ポリエチレン等の比較的厚い被覆での、温水環
境や電気防食下での剥離（温水剥離、陰極剥１１ｉ）に
対する性能は不充分である。Among them, chromate treatment is relatively superior, and along with chromic acid, silica or alumina sol (Japanese Patent Application Laid-Open No. 57-16
9092, etc.) and lysates (Japanese Patent Publication No. 55-35069, etc.) have been used as active ingredients, but these were originally used for rust prevention of galvanized steel sheets, decorative steel sheets, and automobiles. It was developed for treating the paint base of industrial steel plates, and its performance against peeling (hot water peeling, cathodic peeling 11i) with relatively thick coatings such as polyethylene in hot water environments or under cathodic protection is insufficient.
一方、化成処理とは別に、有機のブライマ一層を鋼面と
変性ポリエチレン層との間に形成し、鋼面とポリエチレ
ン層との接着性を高める検討も行われて来ているが、こ
の方法では、化成処理なしにポリエチレンを接着した場
合に対しては、接着強度を向上させるが、温水剥離、陰
極剥離に対する性能は、化成処理同様に不充分である。On the other hand, apart from chemical conversion treatment, studies have also been conducted to form a single layer of organic brimer between the steel surface and the modified polyethylene layer to improve the adhesion between the steel surface and the polyethylene layer, but this method does not work. When polyethylene is bonded without chemical conversion treatment, the adhesive strength is improved, but the performance against hot water peeling and cathodic peeling is insufficient as in the case of chemical conversion treatment.
また、ポリエチレン以外の有機被覆系（エポキシ樹脂、
ポリウレタン、ポリ塩化ビニル等）においても、それの
みでは密着性、防食性能は不充分で、下地処理の導入、
改良が行われて来ているが、ポリエチレンの場合同様に
更なる改善が必要である。In addition, organic coating systems other than polyethylene (epoxy resin,
Even with polyurethane, polyvinyl chloride, etc., adhesion and anti-corrosion performance are insufficient on their own, so it is necessary to introduce surface treatment,
Improvements have been made, but as with polyethylene, further improvements are needed.
〈発明の目的〉
本発明は、数十年にわたる長期防食性能が要求される外
面被覆ラインパイプや重防食鋼管杭、鋼矢板等において
、飛沫帯や海浜地区での腐食、被Ｐｌ端部、庇部からの
剥離に対処すべく対塩水噴霧性の改み、および海中敷設
、湿地中埋設に際し、電気防食時の電流や速歩電流によ
り欠陥部からの剥離が進まないように耐陰極剥離性の改
善、更にラインパイプでは、輸送効率向上のための高温
操業に伴い問題となる耐温水剥離性の向上など、これら
の有機被覆鋼材に求められる防食性能の向上を目的とす
る。<Purpose of the Invention> The present invention aims to prevent corrosion in splash zones and coastal areas, phosphor-covered ends, and eaves in externally coated line pipes, heavy corrosion-resistant steel pipe piles, steel sheet piles, etc. that require long-term corrosion protection performance over several decades. Improved resistance to salt spray to prevent peeling from parts, and improved resistance to cathode peeling to prevent peeling from defective parts due to electric current during cathodic protection or fast walking current when installing under the sea or buried in wetlands. Furthermore, for line pipes, the aim is to improve the corrosion resistance required of these organic coated steel materials, such as improving hot water peeling resistance, which is a problem associated with high-temperature operation to improve transportation efficiency.
〈発明の構成〉
本発明者らは、化成処理の中で、クロメート処理が安価
で、かつ、それのみでの鋼材の防食、防錆性能に比較的
優れることに着目し、クロメート処理の改良を試みた。<Structure of the Invention> The present inventors focused on the fact that among chemical conversion treatments, chromate treatment is inexpensive and has relatively excellent anti-corrosion and rust-preventing performance for steel materials by itself, and developed an improvement in chromate treatment. I tried.
クロメート処理液のＣｒの状態（３価および６価）と添
加剤、すなわち造膜効果のある金属酸化物ゾル（従来よ
り用いられているシリカ、アルミナの他に、酸化鉄、酸
化スズ、酸化アンチモン、チタニア、ジルコニアなど）
およびクロメート皮膜形成時に還元性を示す水溶性の有
機物（エタノール、エチレングリコール、グリセリン、
でんぷん等）の効果について詳細に検討した。The state of Cr (trivalent and hexavalent) in the chromate treatment solution and the additives, i.e. metal oxide sol with film-forming effect (in addition to conventionally used silica and alumina, iron oxide, tin oxide, antimony oxide) , titania, zirconia, etc.)
and water-soluble organic substances (ethanol, ethylene glycol, glycerin,
The effects of starch, etc.) were examined in detail.
その結果、ブラスト処理あるいは酸洗等により清浄化し
た鋼材の表面に０．１〜１０ ｇ／ｍ２のｓｂおよびＳ
ｉを含むクロメート層［（Ｓｂ＋Ｓｉ）／Ｃｒ＝ ０．
１〜２．０：原子比で］を形成した後に、ポリエチレン
、エポキシ樹脂等の被覆材を用いて被覆することにより
、耐塩水噴霧性、耐温水剥離性、耐陰極剥離性の防食性
能に優れた有機被覆鋼材が得られることを見出し、さら
に、上記クロメート層を形成するのに適した下地処理液
およびこの下地処理液を用いた好適な鋼材の有機被覆用
下地処理方法を見出し、本発明に至った。As a result, 0.1 to 10 g/m2 of sb and S were added to the surface of steel materials cleaned by blasting or pickling.
Chromate layer containing i [(Sb+Si)/Cr=0.
1 to 2.0: at an atomic ratio] and then coated with a coating material such as polyethylene or epoxy resin, resulting in excellent corrosion resistance in terms of salt spray resistance, hot water peeling resistance, and cathodic peeling resistance. They have also found that a surface treatment liquid suitable for forming the above-mentioned chromate layer and a suitable method of surface treatment for organic coating of steel materials using this surface treatment liquid have been discovered, and the present invention has been made based on the present invention. It's arrived.
すなわち、本発明は、Ｃｒ”／Ｃｒ６＋が１以下のりロ
ム酸と、該クロム酸中のＣｒに対し、原子比で（Ｓｂ＋
Ｓｉ） ／Ｃｒが０．１〜２．０であって、酸化アンチ
モン粒子の周囲をシリカで被覆してなるコロイド状酸化
物粒子と、水とを含有することを特徴とする鋼材の有機
被覆用下地処理液を提供するものである。That is, the present invention provides chromic acid in which Cr''/Cr6+ is 1 or less, and chromic acid in which the chromic acid has an atomic ratio of (Sb+
For organic coating of steel materials, characterized in that Si)/Cr is 0.1 to 2.0 and contains colloidal oxide particles formed by coating antimony oxide particles with silica, and water. It provides a base treatment liquid.
また、本発明は、Ｃｒ”／Ｃｒ６＋がｌ以−ドのクロム
酸と、該クロム酸中のＣｒに対し、原子比で（ｓｂ＋５
ｉ）１０ｒが０．１〜２．０であって、酸化アンチモン
粒子の周囲をシリカで被覆してなるコロイド状酸化物粒
子と、前記クロム酸１００重、ｌｉｉ、部に対し、少な
くとも１種の還元性を有する水溶性有機物を２００重量
部以下と、水とを含イ１゛することを特徴とする鋼材の
有機被覆用下地処理液を提供するものである。Further, the present invention provides chromic acid in which Cr"/Cr6+ is l or higher, and chromic acid in which the chromic acid has an atomic ratio of (sb+5) to Cr in the chromic acid.
i) colloidal oxide particles in which 10r is 0.1 to 2.0 and is formed by coating antimony oxide particles with silica; The present invention provides a base treatment liquid for organic coating of steel material, which contains 200 parts by weight or less of a water-soluble organic substance having a reducing property and water.
そして、本発明は、清浄化処理した鋼材の表面にＧｒ”
／ Ｃｒ”が１以下のクロム酸と、該クロム酸中のＣ「
に対し原子比で（Ｓｂ＋Ｓｉ） ／Ｃｒが０．１〜０．
２であって、酸化アンチモン粒子の周囲をシリカで被覆
してなるコロイド状酸化物粒子と、水とを含有する下地
処理液を、乾燥重量で０．１〜ｌ。The present invention also provides G" on the surface of the cleaned steel material.
/Cr" is 1 or less chromic acid and C" in the chromic acid.
The atomic ratio (Sb+Si)/Cr is 0.1 to 0.
2, the dry weight of a base treatment liquid containing colloidal oxide particles formed by coating antimony oxide particles with silica and water was 0.1 to 1 by dry weight.
ｇ／ｒｎ′塗イＩＴ Ｌ／、これを５０〜３００℃の温
度で乾燥した後、その上に有機被覆を施すことを特徴と
する鋼材の有機被覆用下地処理方法を提供するものであ
る。The present invention provides a method for treating a base for an organic coating on steel material, which comprises drying the coating at a temperature of 50 to 300 DEG C. and then applying an organic coating thereon.
また、本発明は、清浄化処理した鋼材の表面にＣｒ３°
／ Ｃｒ”＋がｌ以下のクロム酸と、該クロム酸中のＣ
ｒに対し原子比で（Ｓｂ＋Ｓｉ） ／Ｃｒが０．１〜２
．０であって、酸化アンチモン粒子の周囲をシリカで被
覆してなるコロイド状酸化物粒子と、前記クロム酸１０
０重量部に対し少なくとも１種の還元性を有する水溶性
有機物を２００重量部以下と、水とを含有する下地処理
液を、乾燥重量で０．１〜ＩＪ／ｍ２塗布し、これを５
０〜３００℃の温度で乾燥した後、その上に有機被覆を
施すことを特徴とする鋼材の有機被覆用下地処理方法を
提供するものである。In addition, the present invention provides Cr3° on the surface of the cleaned steel material.
/ Chromic acid with Cr"+ of 1 or less and C in the chromic acid
The atomic ratio of (Sb+Si)/Cr to r is 0.1 to 2
．． 0, the colloidal oxide particles formed by coating antimony oxide particles with silica, and the chromic acid 10
A base treatment solution containing water and 200 parts by weight or less of at least one type of water-soluble organic substance having a reducing property per 0 parts by weight is applied at a dry weight of 0.1 to IJ/m2.
The present invention provides a method for treating a surface of steel for organic coating, which comprises drying at a temperature of 0 to 300° C. and then applying an organic coating thereon.
以下に、本発明の有機被覆用下地処理方法および下地処
理液を詳細に説明する。Below, the organic coating base treatment method and base treatment liquid of the present invention will be explained in detail.
本発明は、鋼材の有機被覆に際して、その密着性および
防食性能を向上させる目的を、鋼面と有機被覆層との間
に、安定で、鋼面および有機被覆層の両方との間に強い
結合を生成するクロメート層を形成することにより達成
したものである。そのクロメート層は、ブラスト処理あ
るいは、酸洗にて清浄化した鋼材（特に鋼種を問わない
）の表面に、以下に示すクロム酸系の処理液を乾燥１ｒ
量にて０．１〜１０ ｇ／ｍ２ （好ましくは０．
：ｌ〜２ｇｅｍ２）塗布し、これを５０〜３００℃の温
度範囲で乾燥して得られる。そして、そのトにポリエチ
レン、エポキシ等の有機被覆材で被覆することにより密
着性および防食性能に優れた有機被覆鋼材が得られる。The present invention aims to improve the adhesion and anticorrosion performance of organic coatings on steel materials by creating a stable and strong bond between both the steel surface and the organic coating layer. This was achieved by forming a chromate layer that produces . The chromate layer is created by drying the following chromic acid-based treatment solution for 1 hour on the surface of steel (regardless of the type of steel) that has been cleaned by blasting or pickling.
0.1 to 10 g/m2 (preferably 0.1 to 10 g/m2)
:l~2gem2) and dried at a temperature range of 50~300°C. Then, by coating it with an organic coating material such as polyethylene or epoxy, an organic coated steel material with excellent adhesion and anticorrosion performance can be obtained.
本発明にかかるクロム酸系の処理液は、予めコロイド状
の酸化アンチモンと水ガラス等の低分子−量の水溶性の
ケイ酸系化合物とを液中に共存させ、酸化アンチモンの
カチオン吸着能により酸化アンチモン粒子の周囲をＮａ
”イオン等のカチオンを介してシリカで被覆したコロイ
ド状の酸化物粒子（好適にはＳｉとｓｂの原子比が０
＜ Ｓｉ／Ｓｂ≦１０）と、Ｃｒ’°の一部を３価に還
元されたクロム酸（Ｃｒ”／ Ｃｒ’＋≦１）とを（ｓ
ｉ＋ｓｂ） ／Ｃｒ比が０．１〜２．０の割合で含有す
る水分散液、あるいは、これらに加え前記クロム酸１０
０重量部に対し２００重ｆｉ１部以下（好ましくは１０
〜１００重ｉ＋を部）の水溶性で還元性を有するエタノ
ール、エチレングリコール、グリセリン、でんぷん等の
４ｆ機物を含有する水分散液である。The chromic acid-based treatment liquid according to the present invention is produced by allowing colloidal antimony oxide and a low molecular weight water-soluble silicic acid compound such as water glass to coexist in the liquid in advance, so that antimony oxide has a cation adsorption ability. Na surrounding the antimony oxide particles
``Colloidal oxide particles coated with silica via cations such as ions (preferably, the atomic ratio of Si and sb is 0)
<Si/Sb≦10) and chromic acid (Cr''/Cr'+≦1) in which a part of Cr'° has been reduced to trivalence (s
i+sb) /Cr ratio of 0.1 to 2.0, or in addition to these, the chromic acid 10
0 parts by weight to 1 part or less of 200 parts by weight (preferably 10 parts by weight)
It is an aqueous dispersion containing water-soluble and reducing 4F substances such as ethanol, ethylene glycol, glycerin, and starch in an amount of ~100 parts).
本発明の高い下地処理効果は、以下の要因により発現す
ると考える。It is believed that the high surface treatment effect of the present invention is caused by the following factors.
まず、クロメート層（（：ｒ、 Ｓｂの酸化物および複
合酸化物）は、陰分極に際して酸素の還元電流が小さく
、陰極防食下、あるいは腐食局部セルでの水素およびア
ルカリの発生を抑制するために、剥離および腐食の進行
を抑える。First, the chromate layer ((:r, Sb oxide and composite oxide) has a small oxygen reduction current during cathodic polarization, and is used to suppress the generation of hydrogen and alkali under cathodic protection or in corroded local cells. , suppresses the progress of peeling and corrosion.
本来、酸化アンチモン水分散液とクロム酸（Ｃｒ”／
Ｃｒ≦１）とは相溶性が悪いものであったが、酸化アン
チモン粒子の周囲をシリカで被覆したことによりこれら
の相溶性が改善され、また乾燥後の複合酸化物皮膜をよ
り強固なものとしている。Originally, antimony oxide aqueous dispersion and chromic acid (Cr”/
The compatibility with Cr≦1) was poor, but coating the antimony oxide particles with silica improved their compatibility, and also made the composite oxide film stronger after drying. There is.
なお、クロム酸系化成処理液中のコロイド状の酸化物粒
子（酸化アンチモン粒子の周間をシリカで被覆した粒子
）の粒径は、５〜１１００ｎ程度とするのがよい。その
理由は、処理液中への粒子−の分散性を良好ならしめる
ためである。即ち、特に粒子が１１００ｎｒ程度より大
きくなると、沈降し易くなり、分散性が悪くなるためで
ある。The particle size of the colloidal oxide particles (particles in which the periphery of antimony oxide particles is coated with silica) in the chromic acid-based chemical conversion treatment liquid is preferably about 5 to 1100 nm. The reason for this is to improve the dispersibility of particles into the processing liquid. That is, especially when the particles are larger than about 1100 nm, they tend to settle and the dispersibility deteriorates.
また、粒子径の下限は、現在の技術水準によって容易に
得られるコロイド粒子の粒径が５ｍｌ１１程度であると
いう制約によるものであって、将来において、これより
小さな粒径のコロイド粒子が容易に得られるようになっ
た場合にはこの限りではない。In addition, the lower limit of the particle size is based on the restriction that the particle size of colloidal particles that can be easily obtained with the current state of the art is about 5 ml11, and in the future colloidal particles with a smaller particle size will be easily obtained. This does not apply if it becomes possible to do so.
またＣｒ量に対し、最適なＳｂ＋５ｉｆｉが存在し、ク
ロメート層は強固で安定なものとなる。このため、（Ｓ
ｂ＋ Ｓｉ） ／ Ｃｒ比は、原子比で０．１〜２．０
の範囲であることが好ましい。なお、Ｓｉ／Ｓｂ比は特
に限定されないが、ｏ＜ｓｉ、／ｓｂ≦１０の範囲が好
ましい。Furthermore, there is an optimum Sb+5ifi for the amount of Cr, and the chromate layer becomes strong and stable. For this reason, (S
b+ Si)/Cr ratio is 0.1 to 2.0 in atomic ratio
It is preferable that it is in the range of . Note that the Si/Sb ratio is not particularly limited, but is preferably in the range of o<si, /sb≦10.
第１図に下地処理層中の（Ｓｂ＋Ｓｉ） ／Ｃｒ比の防
食性能（代表として耐陰極剥離性を示す）に対する影響
を、表１にはその試験材の構成を示す。FIG. 1 shows the influence of the (Sb+Si) 2 /Cr ratio in the base treatment layer on anticorrosion performance (representatively cathodic peeling resistance), and Table 1 shows the composition of the test materials.
表１ 試験材の構成
一方、処理液中のエチレングリコール、グリセリン等は
クロメート層形成時にＣｒの還元比を高め、クロメート
層を強固で水に対して難溶なものにする働きがある。し
かし過剰に存在すると元来水溶性であることから、逆に
クロメート層を溶は易くし、有機物自体が溶出した後の
クロメート層が網目状をなし、強度の弱いものとなる。Table 1 Composition of test material On the other hand, ethylene glycol, glycerin, etc. in the treatment liquid have the function of increasing the reduction ratio of Cr during the formation of the chromate layer and making the chromate layer strong and hardly soluble in water. However, since it is inherently water-soluble when present in excess, the chromate layer becomes easier to dissolve, and the chromate layer after the organic matter itself is eluted becomes network-like and weak in strength.
そのためクロメート処理液への添加はクロム酸１００重
量部に対し２００重量部以下がよい。Therefore, the addition to the chromate treatment solution is preferably 200 parts by weight or less per 100 parts by weight of chromic acid.
次に、本発明の有機被膜用下地処理方法について説明す
る。Next, a method for treating a base for an organic film according to the present invention will be explained.
上記クロメート処理液の塗イ１１量については、乾燥重
量で０．１ ｇ／＋２未満であると防食性能の向上効
果が小さく、１０ｇ／Ｉ！＋２を超えると、クロメート
層が有機被膜の庇部で端面方向からの水の侵入を受は易
くなり、また、上部被覆層にポリエチレンのように横方
向の収縮応力が働くと、鋼表面のアンカーパターンの効
果が少なくなり、剥離がいっそう起こり易くなる。従っ
て、クロメート処理液の塗布量は乾燥重量で０．１〜１
０ｇ／ｒｎ”とする。Regarding the coating amount of the above-mentioned chromate treatment liquid, if the dry weight is less than 0.1 g/+2, the effect of improving anticorrosion performance will be small, and 10 g/I! If it exceeds +2, the chromate layer will easily receive water intrusion from the end surface direction at the eaves of the organic coating, and if lateral shrinkage stress acts on the upper coating layer, as with polyethylene, the anchor on the steel surface will The pattern becomes less effective and peeling becomes more likely. Therefore, the amount of chromate treatment liquid applied is 0.1 to 1 on dry weight.
0g/rn".
クロメート処理液の乾燥温度は、５０〜３００℃が好適
である。５０℃より低温では、処理液と鋼面との間の反
応が不充分であり、３００℃を超えると、クロメート層
が急速に収縮して表面にクラックを生じるからである。The drying temperature of the chromate treatment liquid is preferably 50 to 300°C. If the temperature is lower than 50°C, the reaction between the treatment liquid and the steel surface is insufficient, and if the temperature exceeds 300°C, the chromate layer will rapidly shrink and cracks will occur on the surface.
上記のようにしてクロメート層を形成した後、その上に
施す有機被覆の被覆材料には、ポリエチレン、エポキシ
樹脂をはじめポリウレタン、ポリ塩化ビニル、ナイロン
、ポリエステル等のあらゆる樹脂が挙げられ、クロメー
ト層が破壊される３００℃までの温度範囲で塗覆装する
ことにより、密着性、防食性能に優れた有機被覆鋼材が
得られる。After forming the chromate layer as described above, the organic coating material to be applied on top of the chromate layer includes all kinds of resins such as polyethylene, epoxy resin, polyurethane, polyvinyl chloride, nylon, and polyester. By coating in a temperature range of up to 300°C, which causes destruction, organic coated steel materials with excellent adhesion and anticorrosion performance can be obtained.
〈実施例〉
以下に実施例を示し、本発明により得られた有機被覆鋼
材の優れた防食性能を説明する。<Example> Examples will be shown below to explain the excellent anticorrosion performance of the organic coated steel obtained by the present invention.
厚さ：１．２ ｍｎ＋Ｘ １５０ｍｍＸ １５０ｍ［１
１の酋通鋼板ＳＳ４１ （Ｃ： ０．１２． Ｓｉ：
０．２７． Ｍｎ： ０．４５． Ｐ ：０．０９
１．Ｓ ： ０．００４ 、 Ｃｒ： ０．４４
． 八１ ： ０．０３３゜Ｃｕ： ０．２６ｗ
Ｌ％）の鋼面をアルミナ＃４６を用いてブラスト処理し
表面を清浄化した後、下記表２に示す各下地処理液を室
温で塗布し、乾燥した。このときの乾燥温度および塗布
ｆｉｔ （乾燥重量）は表２に示す通りであった。その
後１６０℃の電気炉で１５分間予熱し、次いで、ホット
プレスを用いて１８０℃、１０分間、２．５ Ｋｇ／
ｃｍ２でポリエチレンを圧着した。Thickness: 1.2 mn+X 150mmX 150m [1
No. 1 steel plate SS41 (C: 0.12. Si:
0.27. Mn: 0.45. P:0.09
1. S: 0.004, Cr: 0.44
．． 81: 0.033゜Cu: 0.26w
After cleaning the surface by blasting the steel surface (L%) using alumina #46, each base treatment solution shown in Table 2 below was applied at room temperature and dried. The drying temperature and coating fit (dry weight) at this time were as shown in Table 2. After that, it was preheated in an electric furnace at 160°C for 15 minutes, and then heated at 180°C for 10 minutes using a hot press, 2.5 kg/
Polyethylene was crimped at cm2.
接着性ポリエチレンには無水マレイン酸２％導人により
変性したポリエチレンを、外層ポリエチレンには高密度
ポリエチレンを１＝４の膜厚比で用いた。エポキシ静電
粉体塗装は、１６０℃の電気炉で１５分間予熱、塗装後
、更に１６０℃で１０分間硬化した。塗料にはフェノー
ル硬化タイプのエポキシ樹ＪＦ７を用いた。The adhesive polyethylene was polyethylene modified with 2% maleic anhydride as a conductor, and the outer polyethylene layer was high-density polyethylene with a film thickness ratio of 1=4. The epoxy electrostatic powder coating was preheated in an electric furnace at 160°C for 15 minutes, and then cured at 160°C for 10 minutes. The paint used was phenol curing type epoxy JF7.
かくして得られた有機被覆鋼材の防食性能を評価するた
めに、
防食性能の評価は、１．塩水噴霧試験、２．混塩水浸漬
試験、３．陰極剥離試験を行フだ。その結果を表３に示
す。In order to evaluate the anti-corrosion performance of the organic coated steel material obtained in this way, the evaluation of anti-corrosion performance was as follows: 1. Salt spray test, 2. Mixed salt water immersion test, 3. Perform a cathode peel test. The results are shown in Table 3.
なお、各試験条件は、次の通りである。In addition, each test condition is as follows.
１、塩水噴霧試験
試片サイズ５０Ｘ５０ｍｍの被覆鋼板の被膜中央に３０
ｘ３０のクロスカットを鋼面まで入れ、被覆端面および
裏面はシールする。1. Salt spray test specimen size 50 x 50 mm coated steel plate with 30
Make a x30 cross cut up to the steel surface and seal the coated end and back surface.
ＪＩＳ ２２３７１条件ドで３０目間暴露し、庇部か
らの剥離距離を以って評価した。It was exposed for 30 times under JIS 22371 conditions and evaluated based on the peeling distance from the eaves.
２、温塩水浸漬試験
試片サイズ５０Ｘ１００ｍｍの被覆鋼板をそのまま、端
面、裏面のシールをせずに、８０℃の３％Ｎａ （ｄ２
水溶液に３０日間浸ｔ１１シた後、室温にて剥離強度を
測定し評価した。2. Warm salt water immersion test A coated steel plate with a specimen size of 50 x 100 mm was immersed in 3% Na (d2
After being immersed in an aqueous solution for 30 days, the peel strength was measured and evaluated at room temperature.
３、陰極剥離試験
試片サイズ１０１００Ｘ１００＋の被覆鋼板の被膜中央
に５ｍｍφの孔を鋼面まであけ、−１，５ＶｖｓＳ Ｃ
Ｅで電気防食を施しながら、室温の３％ＫＣＩＬ水溶液
に３０日間暴露し、その間に進行する剥離距離を測定し
評価した。3.Cathode peeling test Drill a 5mmφ hole in the center of the coating of a coated steel plate with sample size 10100x100+ to the steel surface and -1.5V vs S C
The specimens were exposed to a 3% KCIL aqueous solution at room temperature for 30 days while being electrolytically protected using E, and the peeling distance progressed during that period was measured and evaluated.
下記表３かられかるように、本発明例１〜３の有機被覆
鋼材は、塩水噴霧試験、温塩水浸漬試験および陰極剥離
試験のいずれにも高い評価を得ており、総合的に優れた
防食性能を有することが確認された。As can be seen from Table 3 below, the organic coated steel materials of Examples 1 to 3 of the present invention received high evaluations in all of the salt spray test, warm salt water immersion test, and cathode peeling test, and exhibited excellent corrosion protection overall. It was confirmed that the product had good performance.
表２４１−機被覆鋼材の構成（その１）表２４Ｔ機被覆
鋼材の構成（その２）
表３ 防食性能試験結果
〈発明の効果〉
本発明の有機被覆用下地処理液およびこれを用いた下地
処理方法にれば、従来の４ＴＩＩＵ被覆鋼材に比べて防
食性が格段に向上した有機被覆鋼材が得られる。Table 241 - Composition of machine coated steel material (part 1) Table 24 - Composition of machine coated steel material (part 2) Table 3 Corrosion resistance test results <Effects of the invention> Base treatment liquid for organic coating of the present invention and base treatment using the same According to the method, an organic coated steel material with significantly improved corrosion resistance compared to conventional 4TIIU coated steel material can be obtained.
従って、防食性に優れた外面被覆ラインパイプ川鋼管、
小径内談面被覆鋼管、重防食構造用鋼材（鋼管杭、鋼矢
板、鉄筋、鉄骨等）等を提供することができ。Therefore, the outer surface coating line pipe river steel pipe with excellent corrosion resistance,
We can provide small-diameter inner surface coated steel pipes, steel materials for heavy corrosion protection structures (steel pipe piles, steel sheet piles, reinforcing bars, steel frames, etc.).
第１図は、クロメート層中の（Ｓｂ＋Ｓ ｉ） ／Ｃｒ
比と防食性能との関係を示すグラフである。
氏ｒオ÷♀１１離１イ丁距離 （ｍｍ）手続ネｒｌ）正
立Ｆ（自発゛
昭和６２年 ２月２６日
昭和６１年特許願第２１８８４７号
２、発明の名称
有機被覆用下地処理方法および下地処理液３、補正をす
る者
事件との関係 特許出願人
住 所 兵庫県神戸市中央区北本町通１丁目１番２
８号名 称 （１２５）川崎製鉄株式会社４、代 理
人 〒１０１ 電話８６４−４４９８住 所
東京都千代田区岩本町３丁目２番２号５、補正の対象
６、補正の内容
（１）特許請求の範囲を別紙の通り差し代える。
（２）明細書第８頁３行目および同第８頁１５行目「し
た後、その上に有機被覆を施す」を「する」に訂正する
。
（３）同第１１頁１０行目「５ｍｍ」を「５ｎｍ」に訂
正する。
ｒ２、特許請求の範囲
（１） Ｃｒ３”／ Ｃｒ”″が１以下のクロム酸と、
該クロム酸中のＣｒに対し、原子比で（Ｓｂ＋ｓｉ）
／Ｃｒが０．１〜２．０であフて、酸化アンチモン粒子
の周囲をシリカで被覆してなるコロイド状酸化物粒子と
、水とを含有することを特徴とする鋼材の有機被覆用下
地処理液。
（２） Ｃｒ”／ Ｃｒ”″がｌ以下のクロム酸と、該
クロム酸中のＣｒに対し、原子比で（Ｓｂ＋Ｓｉ） ／
Ｃｒが０．１〜２．０であって、酸化アンチモン粒子の
周囲をシリカで被覆してなるコロイド状酸化物粒子と、
前記クロム酸１００重量部に対し、少なくとも１種の還
元性を有する水溶性有機物を２００重量部以下と、水と
を含有することを特徴とする鋼材の有機被覆用下地処理
液。
（３）清浄化処理した鋼材の表面にＣｒ”／Ｃｒ６＋が
１以下のクロム酸と、該クロム酸中のＣｒに対し原子比
で（Ｓｂ＋Ｓｉ） ／Ｃｒが０．１〜０．２であって、
酸化アンチモン粒子の周囲をシリカで被覆してなるコロ
イド状酸化物粒子と、水とを含有する下地処理液を、乾
燥重量で０．１〜１０ｇ／扉塗布し、これを５０〜３０
０℃の温度で乾燥１玉ことを特徴とする鋼材の有機被覆
用上地処理方法。
（４）清浄化処理した鋼材の表面にＣｒ’“／Ｃｒ’＋
がｌ以下のクロム酸と、該クロム酸中のＣ「に対し原子
比で（Ｓｂ十Ｓｉ） ／Ｃｒが０．１〜２．０であって
、酸化アンチモン粒子の周囲をシリカで被覆してなるコ
ロイド状酸化物粒子と、前記クロム酸１００重量部に対
し少なくとも１種の還元性を有する水溶性有機物を２０
０重量部以下と、水とを含有する下地処理液を、乾燥重
量で０．１〜１０ｇ／ｒｎ”塗布し、これを５０〜３０
０℃の温度で乾燥１玉ことを特徴とする鋼材の有機被覆
用下地処理方法。Figure 1 shows (Sb+S i) /Cr in the chromate layer.
It is a graph showing the relationship between the ratio and anticorrosion performance. Mr. r O ÷ ♀ 11 distance 1 distance (mm) Procedure Nerl) Upright F (Spontaneous) February 26, 1988 Patent Application No. 218847 2, Title of Invention Method for treating base for organic coating and Ground Treatment Liquid 3, Relationship with the Amendment Case Patent Applicant Address 1-1-2 Kitahonmachi-dori, Chuo-ku, Kobe City, Hyogo Prefecture
No. 8 Name (125) Kawasaki Steel Corporation 4, Agent 101 Telephone 864-4498 Address
3-2-2-5 Iwamoto-cho, Chiyoda-ku, Tokyo, Subject of amendment 6, Contents of amendment (1) The scope of the claims is replaced as shown in the attached sheet. (2) On page 8, line 3 and page 8, line 15 of the specification, "after applying an organic coating thereon" is corrected to "do". (3) On page 11, line 10, "5mm" is corrected to "5nm". r2, Claim (1) Chromic acid with Cr3"/Cr"" of 1 or less,
(Sb+si) in atomic ratio to Cr in the chromic acid
/Cr is 0.1 to 2.0, and contains colloidal oxide particles formed by coating antimony oxide particles with silica, and water. processing liquid. (2) Chromic acid with Cr"/Cr"" of 1 or less, and the atomic ratio of (Sb+Si)/to Cr in the chromic acid.
Colloidal oxide particles having Cr of 0.1 to 2.0 and comprising antimony oxide particles coated with silica;
A base treatment liquid for organic coating of steel, characterized in that it contains 200 parts by weight or less of at least one type of water-soluble organic substance having a reducing property and water based on 100 parts by weight of the chromic acid. (3) Chromic acid with Cr"/Cr6+ of 1 or less is applied to the surface of the cleaned steel material, and (Sb+Si)/Cr is 0.1 to 0.2 in atomic ratio to Cr in the chromic acid. ,
A base treatment liquid containing colloidal oxide particles formed by coating antimony oxide particles with silica and water is applied to the door at a dry weight of 0.1 to 10 g/door.
A surface treatment method for organic coating of steel, characterized by drying at a temperature of 0°C. (4) Cr'“/Cr'+ on the surface of the cleaned steel material
chromic acid having a chromic acid of 1 or less, and an atomic ratio of (Sb + Si) /Cr to C in the chromic acid of 0.1 to 2.0, and antimony oxide particles are coated with silica. colloidal oxide particles of
A base treatment liquid containing 0 parts by weight or less and water is applied at a dry weight of 0.1 to 10 g/rn'', and
A method for treating a surface for organic coating of steel, characterized by drying one layer at a temperature of 0°C.
Claims (4)
と、該クロム酸中のＣｒに対し、原子比で（Ｓｂ＋Ｓｉ
）／Ｃｒが０．１〜２．０であって、酸化アンチモン粒
子の周囲をシリカで被覆してなるコロイド状酸化物粒子
と、水とを含有することを特徴とする鋼材の有機被覆用
下地処理液。(1) Chromic acid with Cr^3^+/Cr^6^+ of 1 or less and the atomic ratio of (Sb+Si) to Cr in the chromic acid.
)/Cr is 0.1 to 2.0, and contains colloidal oxide particles formed by coating antimony oxide particles with silica, and water, a base material for organic coating of steel materials. processing liquid.
と、該クロム酸中のＣｒに対し、原子比で（Ｓｂ＋Ｓｉ
）／Ｃｒが０．１〜２．０であって、酸化アンチモン粒
子の周囲をシリカで被覆してなるコロイド状酸化物粒子
と、前記クロム酸１００重量部に対し、少なくとも１種
の還元性を有する水溶性有機物を２００重量部以下と、
水とを含有することを特徴とする鋼材の有機被覆用下地
処理液。(2) Chromic acid with Cr^3^+/Cr^6^+ of 1 or less and the atomic ratio of (Sb+Si) to Cr in the chromic acid.
)/Cr of 0.1 to 2.0, colloidal oxide particles formed by coating the periphery of antimony oxide particles with silica, and at least one reducing agent for 100 parts by weight of the chromic acid. 200 parts by weight or less of water-soluble organic substances,
A base treatment liquid for organic coating of steel materials, characterized by containing water.
＾６＾＋が１以下のクロム酸と、該クロム酸中のＣｒに
対し原子比で（Ｓｂ＋Ｓｉ）／Ｃｒが０．１〜０．２で
あって、酸化アンチモン粒子の周囲をシリカで被覆して
なるコロイド状酸化物粒子と、水とを含有する下地処理
液を、乾燥重量で０．１〜１０ｇ／ｍ＾２塗布し、これ
を５０〜３００℃の温度で乾燥した後、その上に有機被
覆を施すことを特徴とする鋼材の有機被覆用下地処理方
法。(3) Cr^3^+/Cr on the surface of the cleaned steel material
Chromic acid with ^6^+ of 1 or less, an atomic ratio of (Sb+Si)/Cr to Cr in the chromic acid of 0.1 to 0.2, and antimony oxide particles are coated with silica. A base treatment solution containing colloidal oxide particles and water is applied at a dry weight of 0.1 to 10 g/m^2, and after drying at a temperature of 50 to 300°C, A method for treating a steel material with an organic coating, the method comprising applying an organic coating.
＾６＾＋が１以下のクロム酸と、該クロム酸中のＣｒに
対し原子比で（Ｓｂ＋Ｓｉ）／Ｃｒが０．１〜２．０で
あって、酸化アンチモン粒子の周囲をシリカで被覆して
なるコロイド状酸化物粒子と、前記クロム酸１００重量
部に対し少なくとも１種の還元性を有する水溶性有機物
を２００重量部以下と、水とを含有する下地処理液を、
乾燥重量で０．１〜１０ｇ／ｍ＾２塗布し、これを５０
〜３００℃の温度で乾燥した後、その上に有機被覆を施
すことを特徴とする鋼材の有機被覆用下地処理方法。(4) Cr^3^+/Cr on the surface of the cleaned steel material
Chromic acid with ^6^+ of 1 or less, an atomic ratio of (Sb+Si)/Cr to Cr in the chromic acid of 0.1 to 2.0, and antimony oxide particles are coated with silica. A base treatment solution containing colloidal oxide particles consisting of; 200 parts by weight or less of at least one water-soluble organic substance having reducing properties per 100 parts by weight of the chromic acid; and water;
Apply 0.1 to 10 g/m^2 in terms of dry weight, and apply this to 50
A method for treating a steel material with an organic coating, which comprises drying at a temperature of ~300°C and then applying an organic coating thereon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21884786A JPS6376882A (en) | 1986-09-17 | 1986-09-17 | Pretreatment for organic coating and pretreating liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21884786A JPS6376882A (en) | 1986-09-17 | 1986-09-17 | Pretreatment for organic coating and pretreating liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6376882A true JPS6376882A (en) | 1988-04-07 |
Family
ID=16726271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21884786A Pending JPS6376882A (en) | 1986-09-17 | 1986-09-17 | Pretreatment for organic coating and pretreating liquid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6376882A (en) |
-
1986
- 1986-09-17 JP JP21884786A patent/JPS6376882A/en active Pending
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