JP2008169438A - Rust preventive pigment composition for galvanized steel sheet - Google Patents
Rust preventive pigment composition for galvanized steel sheet Download PDFInfo
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Abstract
Description
本発明は、亜鉛メッキ鋼板用防錆顔料組成物、特に亜鉛メッキ鋼板を素材とするプレコートメタル(PCM)のプライマーに配合される防錆顔料組成物に関する。 The present invention relates to a rust preventive pigment composition for a galvanized steel sheet, and more particularly to a rust preventive pigment composition blended in a precoated metal (PCM) primer made of a galvanized steel sheet.
亜鉛メッキ鋼板を素材とするPCMは、メッキ層を化成処理した後、プライマー次いでトップコート層を塗装して製造される。PCMは塗装後に切断、曲げ等の機械加工が行われるので切断面では鋼板および亜鉛メッキ層が露出している。そのため切断面の亜鉛メッキ層に犠牲電極効果のない白錆が発生し、遂にはそこから鋼板部にまで錆が発生する。それ故亜鉛メッキ鋼板に使用される防錆顔料には一次的に亜鉛メッキ層に対する防錆性能が求められる。 PCM made of a galvanized steel sheet is manufactured by applying a primer and then a topcoat layer after chemical conversion treatment of the plating layer. Since PCM is subjected to machining such as cutting and bending after coating, the steel plate and the galvanized layer are exposed on the cut surface. Therefore, white rust having no sacrificial electrode effect is generated in the galvanized layer on the cut surface, and finally rust is generated from there to the steel plate portion. Therefore, the rust preventive pigment used for the galvanized steel sheet is primarily required to have a rust preventive performance for the galvanized layer.
この用途に対してはこれまでストロンチウムクロメート系防錆顔料が多く用いられて来たが、この顔料は有害な6価クロムを含むので、これに代わる無公害型防錆顔料の開発が望まれていた。 For this purpose, strontium chromate rust preventive pigments have been used so far. However, since this pigment contains harmful hexavalent chromium, the development of a pollution-free rust preventive pigment is desired. It was.
上記要望を満たすため、例えば、特開2000−273363号では、Mg/Si原子比が0.025〜1.0である無定形含水ケイ酸マグネシウム化合物よりなる亜鉛メッキ鋼板用防錆顔料が開示されている。また、特開2001−192869では、Mg/Si原子比が0.025〜1.0である無定形含水ケイ酸マグネシウム化合物により、緻密な無機担体の表面を被覆してなる亜鉛メッキ鋼板用防錆顔料が開示されている。 In order to satisfy the above demand, for example, JP 2000-273363 A discloses a rust preventive pigment for a galvanized steel sheet made of an amorphous hydrous magnesium silicate compound having an Mg / Si atomic ratio of 0.025 to 1.0. ing. Japanese Patent Laid-Open No. 2001-192869 discloses a rust preventive for a galvanized steel sheet in which a surface of a dense inorganic carrier is coated with an amorphous hydrous magnesium silicate compound having an Mg / Si atomic ratio of 0.025 to 1.0. Pigments are disclosed.
しかしながら、これら無定形含水ケイ酸マグネシウム化合物自体の防錆性能はストロンチウムクロメートに匹敵するものの、吸油量が高く、結果として粉体としてかさ高いものとなり、塗料として使用する場合には、その扱いが難しいという問題があった。 However, these amorphous hydrous magnesium silicate compounds themselves have rust prevention performance comparable to that of strontium chromate, but the oil absorption is high, resulting in a bulky powder, which is difficult to handle when used as a paint. There was a problem.
さらに本出願人の特許第3004486号公報には、トリポリリン酸二水素アルミニウム、メタリン酸アルミニウム、層状リン酸チタン、層状リン酸ジルコニウムまたは層状リン酸セリウムから選ばれた水に難溶性のリン酸化合物と、酸化マグネシウム、含水酸化マグネシウム、炭酸マグネシウムまたはホウ酸マグネシウムより選ばれたマグネシウム化合物よりなる亜鉛メッキ鋼板用防錆顔料組成物が記載されている。 Further, the present applicant's Patent No. 3004486 discloses a water-insoluble phosphate compound selected from aluminum dihydrogen triphosphate, aluminum metaphosphate, layered titanium phosphate, layered zirconium phosphate or layered cerium phosphate; In addition, a rust preventive pigment composition for a galvanized steel sheet made of a magnesium compound selected from magnesium oxide, hydrous magnesium oxide, magnesium carbonate or magnesium borate is described.
これら公知の亜鉛メッキ鋼板用防錆顔料組成物は、通常の溶融亜鉛メッキ鋼板に対する防錆性能は優れているが、建材用PCM素材として使われているアルミニウム55%の溶融アルミニウム亜鉛合金メッキ鋼板であるガルバリウム鋼板に対する防錆性能、特にPCM鋼板の切断部である端面からの腐食(エッヂクリープ)が不十分であり、ストロンチウムクロメートの代替として使用出来るものはなく、すぐれた無公害防錆顔料組成物の開発が要望されている。 These known anti-corrosion pigment compositions for galvanized steel sheets are superior in anti-corrosion performance to ordinary hot-dip galvanized steel sheets, but are 55% aluminum molten aluminum zinc alloy-plated steel sheets used as PCM materials for building materials. Rust prevention performance for a certain galvalume steel sheet, especially corrosion from the edge (cutting edge) of PCM steel sheet is insufficient, there is no substitute for strontium chromate, and it is an excellent pollution-free rust preventive pigment composition Development is demanded.
この要望を満たすため、本発明は以下の2成分よりなる亜鉛メッキ鋼板用防錆顔料組成物を提供する。 In order to satisfy this demand, the present invention provides a rust preventive pigment composition for galvanized steel sheet comprising the following two components.
(a)水に難溶性の縮合リン酸アルミニウム塩、または4価金属の層状リン酸塩、および
(b)酸化マグネシウムの2成分を含み;
重量基準で(a):(b)が1:0.5ないし1:10であることを特徴とする。
(A) a water-soluble condensed aluminum phosphate salt or a tetravalent metal layered phosphate, and (b) magnesium oxide, two components;
(A) :( b) is 1: 0.5 to 1:10 on a weight basis.
この組成比の防錆顔料組成物とすることで、公知の1成分系または2成分系防錆顔料組成物およびストロンチウムクロメートに比較してガルバリウム鋼板を含む亜鉛メッキ鋼板に対する防錆性能が向上する。 By setting it as the antirust pigment composition of this composition ratio, the antirust performance with respect to the galvanized steel plate containing a galvalume steel plate improves compared with a well-known 1 component or 2 component type antirust pigment composition and strontium chromate.
(a)成分
(a)成分は水に難溶性の縮合リン酸アルミニウム塩、または4価金属の層状リン酸塩である。
Component (a) Component (a) is a condensed aluminum phosphate salt that is sparingly soluble in water, or a layered phosphate of a tetravalent metal.
前者の典型例はトリポリリン酸二水素アルミニウムおよびメタリン酸アルミニウムである。トリポリリン酸二水素アルミニウムは主として鋼板用防錆顔料として市販されており、例えば出願人会社からK−フレッシュ#100Pの商品名で販売されている。メタリン酸アルミニウムは例えばトリポリリン酸二水素アルミニウムを高温で焼成し、粉砕することによって製造することができ、例えばK−ボンド#90の商品名で出願人会社から市販されている。 Typical examples of the former are aluminum dihydrogen triphosphate and aluminum metaphosphate. Aluminum dihydrogen triphosphate is commercially available mainly as a rust preventive pigment for steel sheets, and is sold, for example, under the trade name K-Fresh # 100P by the applicant company. Aluminum metaphosphate can be produced, for example, by calcining and grinding aluminum dihydrogen triphosphate at a high temperature, and is commercially available, for example, from the applicant company under the trade name K-Bond # 90.
縮合リン酸アルミニウム塩の代りに4価金属の層状リン酸を(a)成分として使用することができる。このものは本出願人の特許第3004486号公報に記載されている防錆顔料組成物の成分の一つであり、その製造法も該公報に記載されている。それらは一般に4価金属の酸化物、水酸化物などをオルトリン酸と反応させることによって製造することができ、生成物はM(IV)(HPO4)2・nH2Oの形の第二リン酸塩の形を取る。4価金属としてTi,ZrまたはCeが好ましい。 Instead of the condensed aluminum phosphate salt, a tetravalent metal layered phosphoric acid can be used as the component (a). This is one of the components of the rust preventive pigment composition described in Japanese Patent No. 3004486 of the present applicant, and its production method is also described in the publication. They can generally be produced by reacting tetravalent metal oxides, hydroxides, etc. with orthophosphoric acid, and the product is a secondary phosphorus in the form of M (IV) (HPO 4 ) 2 .nH 2 O. Takes the salt form. Ti, Zr or Ce is preferable as the tetravalent metal.
(b)成分
市販の酸化マグネシウムを(b)成分として使用することができる。
Component (b) Commercially available magnesium oxide can be used as component (b).
防錆顔料組成物
一般に本発明の防錆顔料組成物は、特許第3004486号の2成分系組成物の配合比率が異なるもので(a)水に難溶性の縮合リン酸アルミニウム塩、または4価金属の層状リン酸塩;および
(b)酸化マグネシウムの2成分を含み;
重量基準で(a):(b)が1:0.5ないし1:10である。
Rust Preventive Pigment Composition Generally, the rust preventive pigment composition of the present invention is different in the blending ratio of the two-component composition of Japanese Patent No. 3004486, and (a) a condensed aluminum phosphate salt that is hardly soluble in water, or tetravalent. A metal layered phosphate; and (b) containing two components of magnesium oxide;
(A) :( b) is 1: 0.5 to 1:10 on a weight basis.
2成分の混合方法は任意であり、混合順序および使用する装置のタイプは問わない。典型的には2成分を所定の比率で混合機に仕込み、均一になるまで乾式あるいは湿式で混合される。その際粉砕機能を有する混合装置、例えばジェットミル、サンドグライドミル、アトマイザー、スーパーミクロンミル、フィッツミル、レイモンドミル、ボールミル等を用いて組成物の混合と同時に微細に粉砕するのが好ましい。あるいは、室温から90℃までの水を入れた反応槽にこれらの成分を投入し、所定時間攪拌後、ろ過、乾燥後、上記の粉砕機で粉砕しても良い。
PCMでは、防錆顔料が配合される下塗り塗料は、一般的に3〜10μmと非常に薄膜に塗装され使われる為、微細な粒径の顔料がより適している。
塗料適性だけではなく、ジェットミルなどで超微細化することにより、防錆顔料組成物の比表面積が増大し有効成分が溶出しやすくなるとともに、塗膜中に均一に存在していることで腐食局部近傍に防錆顔料組成物が存在していることで、腐食時の防錆顔料組成物の反応速度が増大し、防錆性能が向上する。
The mixing method of two components is arbitrary, and the mixing order and the type of apparatus to be used are not ask | required. Typically, the two components are charged into a blender at a predetermined ratio and mixed dry or wet until uniform. At that time, it is preferable to finely grind the composition simultaneously with mixing using a mixing apparatus having a grinding function, such as a jet mill, a sand glide mill, an atomizer, a supermicron mill, a Fitz mill, a Raymond mill, or a ball mill. Alternatively, these components may be charged into a reaction vessel containing water from room temperature to 90 ° C., stirred for a predetermined time, filtered, dried, and then pulverized by the above pulverizer.
In PCM, a primer having a fine particle diameter is more suitable because an undercoating paint containing a rust preventive pigment is generally applied to a very thin film of 3 to 10 μm.
Not only the paint suitability but also the ultra-fine size with a jet mill etc. increases the specific surface area of the rust-preventive pigment composition, which makes it easier for the active ingredients to elute, and the presence of the anti-corrosion pigment in the coating uniformly corrodes it. The presence of the rust preventive pigment composition in the vicinity of the local area increases the reaction rate of the rust preventive pigment composition during corrosion and improves the rust preventive performance.
本発明の顔料組成物の塗料化および亜鉛メッキ鋼板への塗装方法は、先に引用した特開2001−192869号に開示した方法と同じである。 The method of making the pigment composition of the present invention into a paint and coating the galvanized steel sheet is the same as the method disclosed in JP 2001-192869 cited above.
以下の実施例は例証目的であって限定ではない。これらにおいて部および%は特記しない限り重量基準による。 The following examples are for purposes of illustration and not limitation. In these, parts and% are based on weight unless otherwise specified.
製造例1 メタリン酸アルミニウム
テイカ(株)製トリポリリン酸アルミニウム(商品名K−フレッシュ#100P)500gを箱形電気炉に入れ、500℃で2時間焼成し、粉砕することによって白色粉末409.3gを得た。X線回折の結果このものはメタリン酸アルミニウムであることが判明した。このものを(b2)とし、テイカ(株)製トリポリリン酸二水素アルミニウム、商品名K−フレッシュ#100Pを(b1)とした。
Production Example 1 Aluminum Metaphosphate 500 g of aluminum tripolyphosphate (trade name K-Fresh # 100P) manufactured by Teika Co., Ltd. was placed in a box-shaped electric furnace, calcined at 500 ° C. for 2 hours, and pulverized to obtain 409.3 g of white powder. Obtained. X-ray diffraction revealed that this was aluminum metaphosphate. This was designated as (b2), and Teika's aluminum dihydrogen tripolyphosphate, trade name K-Fresh # 100P was designated as (b1).
製造例2 結晶性リン酸チタン
水酸化チタンTi(OH)411.6gと85%リン酸34.6g(P2O5/TiO2モル比1.5)とを磁製ルツボ中で攪拌混合し、混合物をルツボごと210℃に温度設定された電気炉に入れ、210℃の加熱水蒸気を吹き込み、水蒸気の存在下210℃で5時間反応させた。この反応生成物を水洗、脱水、乾燥した後粉砕し、白色粉末を得た。X線回折の結果、このものは組成式Ti(HPO4)2・2H2Oを有する結晶性層状リン酸チタンであり、この層状リン酸チタンの層間距離を粉末X線回折により測定したところ11.6オングストロームであった。このものを(b3)とする。
Production Example 2 Crystalline titanium phosphate 11.6 g of titanium hydroxide Ti (OH) 4 and 34.6 g of 85% phosphoric acid (P 2 O 5 / TiO 2 molar ratio 1.5) were stirred and mixed in a magnetic crucible. Then, the mixture was placed in an electric furnace whose temperature was set to 210 ° C. together with the crucible, heated steam at 210 ° C. was blown, and reacted at 210 ° C. for 5 hours in the presence of water vapor. The reaction product was washed with water, dehydrated, dried and then pulverized to obtain a white powder. As a result of X-ray diffraction, this was a crystalline layered titanium phosphate having the composition formula Ti (HPO 4 ) 2 .2H 2 O, and the interlayer distance of the layered titanium phosphate was measured by powder X-ray diffraction. It was 6 angstroms. This is defined as (b3).
製造例3 結晶性リン酸ジルコニウム
水酸化ジルコニウム(ZrO2:85%)29.0gと85%リン酸46.1g(P2O5/ZrO2モル比2.0)とを磁製ルツボ中で1時間攪拌混合し、混合物をルツボごと150℃に温度設定された電気炉に入れ、150℃の加熱水蒸気を吹き込み、水蒸気の存在下150℃で20時間反応させた。この反応生成物を水洗、脱水、乾燥した後粉砕し、白色粉末を得た。X線回折の結果、このものは組成式Zr(HPO4)2・H2Oを有する結晶性層状リン酸ジルコニウムであり、この層状リン酸ジルコニウムの層間距離を粉末X線回折により測定したところ7.6オングストロームであった。このものを(b4)とする。
Production Example 3 Crystalline zirconium phosphate 29.0 g of zirconium hydroxide (ZrO 2 : 85%) and 46.1 g of 85% phosphoric acid (P 2 O 5 / ZrO 2 molar ratio 2.0) in a magnetic crucible The mixture was stirred and mixed for 1 hour, and the mixture was placed in an electric furnace set at 150 ° C. together with the crucible, heated steam at 150 ° C. was blown, and reacted at 150 ° C. for 20 hours in the presence of water vapor. The reaction product was washed with water, dehydrated, dried and then pulverized to obtain a white powder. As a result of X-ray diffraction, this was a crystalline layered zirconium phosphate having the composition formula Zr (HPO 4 ) 2 .H 2 O, and the interlayer distance of the layered zirconium phosphate was measured by powder X-ray diffraction. It was 6 angstroms. This is defined as (b4).
製造例4 結晶性リン酸セリウム
水酸化セリウム(CeO2:90%)76.6gと85%リン酸46.1g(P2O5/CeO2モル比1.0)とを磁製ルツボ中で1時間攪拌混合し、混合物をルツボごと150℃に温度設定された電気炉に入れ、150℃の加熱水蒸気を吹き込み、水蒸気の存在下150℃で20時間反応させた。この反応生成物を水洗、脱水、乾燥した後粉砕し、白色粉末を得た。X線回折の結果、このものは組成式Ce(HPO4)2・2H2Oを有する結晶性層状リン酸セリウムであり、この層状リン酸セリウムの層間距離を粉末X線回折により測定したところ18.0オングストロームであった。このものを(b5)とする。
Production Example 4 Crystalline cerium phosphate 76.6 g of cerium hydroxide (CeO 2 : 90%) and 85% phosphoric acid 46.1 g (P 2 O 5 / CeO 2 molar ratio 1.0) in a magnetic crucible The mixture was stirred and mixed for 1 hour, and the mixture was placed in an electric furnace set at 150 ° C. together with the crucible, heated steam at 150 ° C. was blown, and reacted at 150 ° C. for 20 hours in the presence of water vapor. The reaction product was washed with water, dehydrated, dried and then pulverized to obtain a white powder. As a result of X-ray diffraction, this was crystalline layered cerium phosphate having the composition formula Ce (HPO 4 ) 2 .2H 2 O, and the interlayer distance of the layered cerium phosphate was measured by powder X-ray diffraction. 18 It was 0.0 angstrom. This is defined as (b5).
実施例1−9、比較例2−4
表1に示す(a)成分と、(b)成分(協和化学工業(株)製酸化マグネシウムT)とを表に示す重量部の組成で80℃の温水中で2時間攪拌、混合し、本発明の防錆顔料組成物および比較例2−4の組成物を得た。
Example 1-9, Comparative Example 2-4
The component (a) shown in Table 1 and the component (b) (magnesium oxide T manufactured by Kyowa Chemical Industry Co., Ltd.) in the composition of parts by weight shown in the table are stirred and mixed in warm water at 80 ° C. for 2 hours. The rust preventive pigment composition of the invention and the composition of Comparative Example 2-4 were obtained.
比較例6
市販のCaイオン交換シリカ(グレース社製シールデックスC303)を使用した。
Comparative Example 6
Commercially available Ca ion exchange silica (Grace Shieldex C303) was used.
比較例7
市販のストロンチウムクロメート(キクチカラー社製)を使用した。
Comparative Example 7
A commercially available strontium chromate (manufactured by Kikuchi Color) was used.
塗料試験
1.塗料化および試験板作製
実施例および比較例の顔料を用いて、下表に示す配合組成の焼付型ポリエステル樹脂系塗料(下塗り)を調製し、被塗板の表裏両面に塗膜形成、焼き付け後、予め調製しておいた下表に示す配合組成の焼付型ポリエステル樹脂系塗料(上塗り)を片面のみ塗装、焼き付け塗装板を作製した。この塗装板の両面を切断し端面(切り上げ、切り下げ)とし、上部を2Tの厚みで折り曲げたものを試験板とし、防錆試験を実施した。
Paint test Preparation of paint and preparation of test plate Using the pigments of Examples and Comparative Examples, a baking type polyester resin-based paint (undercoat) having the composition shown in the following table was prepared. After coating and baking on both the front and back surfaces of the coated plate, Only a single side of a pre-prepared baking-type polyester resin-based paint (top coat) having the composition shown in the following table was applied to prepare a baked-on board. Both sides of this coated plate were cut into end surfaces (rounded up and down), and the top was bent at a thickness of 2T was used as a test plate, and a rust prevention test was performed.
塗料配合(下塗り)
スーパーベッコライト M−6801−30(NV=30%)1) 52.7%
スーパーベッカミン L−117−60(NV=60%)2) 1.8%
スーパーベッカミン L−105−60(NV=60%)3) 3.7%
酸化チタン JR−6034) 8.7%
試料 13.1%
溶剤(ソルベッソ1005)/シクロヘキサノン/n−ブタノール/ブチルセロ
ソルブ=60/30/6/10) 20.1%
合計 100.0%
P/B=1.1 PVC=26.9
1)大日本インキ化学社製 オイルフリーポリエステル樹脂
2)大日本インキ化学社製 ブチル化メラミン樹脂
3)大日本インキ化学社製 メチル化メラミン樹脂
4)テイカ社製 白色顔料
5)エクソン化学社製 芳香族溶剤
Paint formulation (undercoat)
Super Beckolite M-6801-30 (NV = 30%) 1) 52.7%
Super Becamine L-117-60 (NV = 60%) 2) 1.8%
Super Becamine L-105-60 (NV = 60%) 3) 3.7%
Titanium oxide JR-603 4) 8.7%
Sample 13.1%
Solvent (Solvesso 100 5) / cyclohexanone / n-butanol / butyl cello
Solve = 60/30/6/10) 20.1%
Total 100.0%
P / B = 1.1 PVC = 26.9
1) Dainippon Ink Chemical Co., Ltd. oil-free polyester resin 2) Dainippon Ink Chemical Co., Ltd. butylated melamine resin 3) Dainippon Ink Chemical Co., Ltd. methylated melamine resin 4) Teika Co., Ltd. White pigment 5) Exxon Chemical Co., Ltd. aroma Family solvents
塗料配合(上塗り)
スーパーベッコライト M−6401−50(NV=50%)6) 53.3%
スーパーベッカミン LJ820−60(NV=60%)7) 7.8%
酸化チタン JR−6034) 31.3%
溶剤(ソルベッソ1005)/シクロヘキサノン/n−ブタノール/ブチルセロ
ソルブ=60/30/6/10) 7.5%
合計 100.0%
P/B=1.0 PVC=20.0
1)大日本インキ化学社製 オイルフリーポリエステル樹脂
2)大日本インキ化学社製 ブチル化メラミン樹脂
3)大日本インキ化学社製 メチル化メラミン樹脂
4)テイカ社製 白色顔料
5)エクソン化学社製 芳香族溶剤
被塗板1:溶融亜鉛メッキ鋼板(GI) SGCC(日本テストパネル製)
目付244g/m2 厚み0.3mm
被塗板2:ガルバリウム鋼板(GL)(日本テストパネル製)
目付150g/m2 厚み0.6mm
塗装 :バーコーター
硬化条件:焼き付け温度 210℃(物温)
膜厚 :下塗り塗料 5μm、上塗り塗料 15μm
分散 :ペイントコンディショナー
Paint formulation (top coating)
Super Beckolite M-6401-50 (NV = 50%) 6) 53.3%
Super Becamine LJ820-60 (NV = 60%) 7) 7.8%
Titanium oxide JR-603 4) 31.3%
Solvent (Solvesso 100 5) / cyclohexanone / n-butanol / butyl cello
Solve = 60/30/6/10) 7.5%
Total 100.0%
P / B = 1.0 PVC = 20.0
1) Dainippon Ink Chemical Co., Ltd. oil-free polyester resin 2) Dainippon Ink Chemical Co., Ltd. butylated melamine resin 3) Dainippon Ink Chemical Co., Ltd. methylated melamine resin 4) Teika Co., Ltd. White pigment 5) Exxon Chemical Co., Ltd. aroma Family solvents
Coating plate 1: Hot-dip galvanized steel sheet (GI) SGCC (manufactured by Nippon Test Panel)
244 g / m 2 per unit weight 0.3 mm
Coating plate 2: Galvalume steel plate (GL) (manufactured by Nippon Test Panel)
Weight per unit area 150g / m 2 Thickness 0.6mm
Coating: Bar coater curing conditions: Baking temperature 210 ° C (material temperature)
Film thickness: undercoat paint 5μm, topcoat paint 15μm
Dispersion: Paint conditioner
2.防錆性試験(トータル140点満点)
被塗板1種類当たり70点、一般亜鉛メッキとガルバリウムとで別採点。
2.1 塩水噴霧試験(SST)(30点満点×2種類)
上記塗装条件で被塗板上に塗膜を形成することによって作成した試験板に、カッターナイフで被塗板表面に達するクロスカットを入れ、槽内温度を35℃に保った塩水噴霧試験器内に静置して、5%塩化ナトリウム水溶液を1kg/cm2の圧力で所定時間(GI1500時間、GL750時間)、塗膜に噴霧し、錆発生状況および塗膜の膨れを観察して、以下の評価基準に基づき評価した。なお、腐食状況は平面部の膨れと錆の発生面積、並びにカット部、端面切り上げ部、端面切り下げ部、折り曲げ部の腐食幅で評価した。いずれの評価においても、評価点が高いほど防錆能が優れている。
サビ発生防止効果の評価基準(ASTM D610−68(1970) に準拠)
平面部
サビ発生面積 0.1%未満 : 5点
サビ発生面積 0.1%以上〜1%未満 : 4点
サビ発生面積 1%以上〜10%未満 : 3点
サビ発生面積 10%以上〜33%未満 : 2点
サビ発生面積 33%以上 : 1点
フクレ発生防止効果の評価基準(ASTM D−714−59(1965)に準拠)
平面部
8F以下 : 5点
8M,6F : 4点
8MD,6M,F : 3点
8D,6MD,4M,2F : 2点
6D,4MD以上、2M以上 : 1点
カット部、端面部
腐食幅 0〜1mm : 5点
腐食幅 1〜2mm : 4点
腐食幅 2〜4mm : 3点
腐食幅 4〜7mm : 2点
腐食幅 7〜10mm : 1点
2.2 複合サイクル試験(CCT)(30点満点×2種類)
塩水噴霧試験と同様にカッターナイフで被塗板表面に達するクロスカットを入れた試験板を、複合サイクル試験器内に静置して、JIS H8502 めっきの耐食性試験に記載されている中性塩水噴霧サイクル試験の条件(1)塩水噴霧試験 5%NaCl溶液噴霧 35℃ 2時間 (2)乾燥 60℃ 4時間(3)湿潤 湿度95RH%以上 50℃ 2時間(8時間/1サイクル)で、所定時間(GI 1504時間 188サイクル、GL 800時間 100サイクル)、試験を行った。錆発生状況および塗膜の膨れを観察して、塩水噴霧試験と同様の評価基準に基づき評価した。
2.3 耐湿試験(HT)(10点満点×2種類)
クロスカットしていない上記試験板を槽内温度50℃,相対湿度95%以上に保った耐湿試験器内に500時間静置し、塗膜の膨れを観察し、塩水噴霧試験の平面部のフクレ発生防止効果と同様の評価基準により評価した。
2. Rust prevention test (total 140 points)
70 points for each type of coated plate, scored separately for general galvanizing and galvalume.
2.1 Salt spray test (SST) (30 points x 2 types)
A test plate created by forming a coating film on the coated plate under the above coating conditions is cross-cut reaching the coated plate surface with a cutter knife, and statically placed in a salt spray tester in which the temperature in the tank is maintained at 35 ° C. 5% aqueous solution of sodium chloride at a pressure of 1 kg / cm 2 for a predetermined time (GI 1500 hours, GL 750 hours), sprayed onto the coating film, and observed the rust generation and swelling of the coating film, and the following evaluation criteria Based on the evaluation. The corrosion state was evaluated based on the swelling area of the flat portion and the area where rust was generated, and the corrosion width of the cut portion, the end face cut-up portion, the end face cut-down portion, and the bent portion. In any evaluation, the higher the evaluation score, the better the rust prevention ability.
Evaluation standard of rust prevention effect (according to ASTM D610-68 (1970))
Flat part Rust generation area Less than 0.1%: 5 points Rust generation area 0.1% to less than 1%: 4 points Rust generation area 1% to less than 10%: 3 points Rust generation area 10% to 33% Less than: 2 points
Rust generation area 33% or more: 1 point
Evaluation criteria for the effect of preventing blistering (based on ASTM D-714-59 (1965))
Flat part 8F or less: 5 points 8M, 6F: 4 points 8MD, 6M, F: 3 points 8D, 6MD, 4M, 2F: 2 points 6D, 4MD or more, 2M or more: 1 point cut part, end face part Corrosion width 0 1 mm: 5 points Corrosion width 1-2 mm: 4 points Corrosion width 2-4 mm: 3 points Corrosion width 4-7 mm: 2 points
Corrosion width 7-10mm: 1 point
2.2 Combined cycle test (CCT) (30 points full scale x 2 types)
Neutral salt spray cycle described in the corrosion resistance test of JIS H8502 plating by leaving the test plate with the crosscut reaching the surface of the coated plate with a cutter knife in the same way as the salt spray test. Test conditions (1) Salt spray test 5% NaCl solution spray 35 ° C. 2 hours (2) Dry 60 ° C. 4 hours (3) Wet humidity 95RH% or more 50 ° C. 2 hours (8 hours / 1 cycle) for a predetermined time ( GI 1504 hours 188 cycles, GL 800 hours 100 cycles). The state of rust generation and the swelling of the coating film were observed and evaluated based on the same evaluation criteria as in the salt spray test.
2.3 Humidity resistance test (HT) (10 points full scale x 2 types)
The test plate, which is not cross-cut, is allowed to stand in a humidity resistance tester maintained at a temperature of 50 ° C. and a relative humidity of 95% or more for 500 hours. Evaluation was performed according to the same evaluation criteria as the generation prevention effect.
3.結果
結果は表2に示す。
3. Results The results are shown in Table 2.
Claims (5)
(b)酸化マグネシウムの2成分を含み;
重量基準で(a):(b)が1:0.5ないし1:10であることを特徴とする亜鉛メッキ鋼板用防錆顔料組成物。 (A) a water-soluble condensed aluminum phosphate salt or a tetravalent metal layered phosphate; and (b) two components of magnesium oxide;
A rust preventive pigment composition for galvanized steel sheets, wherein (a) :( b) is 1: 0.5 to 1:10 on a weight basis.
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JP2017122186A (en) * | 2016-01-08 | 2017-07-13 | 新日鐵住金株式会社 | Coating composition and coated member prepared therewith |
JP2018119242A (en) * | 2017-01-26 | 2018-08-02 | 新日鐵住金株式会社 | Steel cord and rubber-steel cord composite |
JP6838195B1 (en) * | 2020-12-10 | 2021-03-03 | 日本ペイント・インダストリアルコ−ティングス株式会社 | Method for manufacturing rust preventive paint composition and rust preventive coating film |
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JP3004486B2 (en) * | 1992-09-22 | 2000-01-31 | テイカ株式会社 | Rust prevention pigment composition |
JP2005162879A (en) * | 2003-12-02 | 2005-06-23 | Jfe Steel Kk | Coating composition for precoated steel plate and precoated steel plate |
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JP3004486B2 (en) * | 1992-09-22 | 2000-01-31 | テイカ株式会社 | Rust prevention pigment composition |
JP2005162879A (en) * | 2003-12-02 | 2005-06-23 | Jfe Steel Kk | Coating composition for precoated steel plate and precoated steel plate |
Cited By (5)
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JP2017122186A (en) * | 2016-01-08 | 2017-07-13 | 新日鐵住金株式会社 | Coating composition and coated member prepared therewith |
JP2018119242A (en) * | 2017-01-26 | 2018-08-02 | 新日鐵住金株式会社 | Steel cord and rubber-steel cord composite |
JP6838195B1 (en) * | 2020-12-10 | 2021-03-03 | 日本ペイント・インダストリアルコ−ティングス株式会社 | Method for manufacturing rust preventive paint composition and rust preventive coating film |
WO2022123802A1 (en) * | 2020-12-10 | 2022-06-16 | 日本ペイント・インダストリアルコーティングス株式会社 | Rust preventive coating composition and method for producing rust preventive coating film |
JP2022092424A (en) * | 2020-12-10 | 2022-06-22 | 日本ペイント・インダストリアルコ-ティングス株式会社 | Rustproof coating composition and manufacturing method of rustproof coating film |
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