JP2023145293A - Coating material and steel material - Google Patents
Coating material and steel material Download PDFInfo
- Publication number
- JP2023145293A JP2023145293A JP2022066616A JP2022066616A JP2023145293A JP 2023145293 A JP2023145293 A JP 2023145293A JP 2022066616 A JP2022066616 A JP 2022066616A JP 2022066616 A JP2022066616 A JP 2022066616A JP 2023145293 A JP2023145293 A JP 2023145293A
- Authority
- JP
- Japan
- Prior art keywords
- steel material
- mass
- coating film
- powder
- alkaline earth
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 121
- 239000010959 steel Substances 0.000 title claims abstract description 121
- 239000000463 material Substances 0.000 title claims abstract description 114
- 238000000576 coating method Methods 0.000 title claims abstract description 69
- 239000011248 coating agent Substances 0.000 title claims abstract description 67
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 36
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims abstract description 30
- 239000000843 powder Substances 0.000 claims abstract description 27
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 19
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 18
- 150000001342 alkaline earth metals Chemical class 0.000 claims abstract description 16
- 239000011230 binding agent Substances 0.000 claims abstract description 16
- 229910000027 potassium carbonate Inorganic materials 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims abstract description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000011701 zinc Substances 0.000 claims abstract description 7
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 7
- 229910001297 Zn alloy Inorganic materials 0.000 claims abstract description 6
- 239000003973 paint Substances 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims description 10
- 229910001860 alkaline earth metal hydroxide Inorganic materials 0.000 claims description 9
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- CSSYLTMKCUORDA-UHFFFAOYSA-N barium(2+);oxygen(2-) Chemical class [O-2].[Ba+2] CSSYLTMKCUORDA-UHFFFAOYSA-N 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims 2
- 238000004090 dissolution Methods 0.000 claims 2
- 238000005260 corrosion Methods 0.000 abstract description 51
- 230000007797 corrosion Effects 0.000 abstract description 50
- 229920005989 resin Polymers 0.000 description 23
- 239000011347 resin Substances 0.000 description 23
- 239000010410 layer Substances 0.000 description 20
- 235000017550 sodium carbonate Nutrition 0.000 description 15
- 238000012360 testing method Methods 0.000 description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- -1 alkaline earth metal cations Chemical class 0.000 description 14
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 12
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 238000007792 addition Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 150000004679 hydroxides Chemical class 0.000 description 6
- 239000000049 pigment Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 239000000292 calcium oxide Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 5
- 239000003822 epoxy resin Substances 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 235000010216 calcium carbonate Nutrition 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000004606 Fillers/Extenders Substances 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000003125 aqueous solvent Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 239000008096 xylene Substances 0.000 description 2
- CBECDWUDYQOTSW-UHFFFAOYSA-N 2-ethylbut-3-enal Chemical compound CCC(C=C)C=O CBECDWUDYQOTSW-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 241000316887 Saissetia oleae Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000003849 aromatic solvent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 description 1
- YXVFQADLFFNVDS-UHFFFAOYSA-N diammonium citrate Chemical compound [NH4+].[NH4+].[O-]C(=O)CC(O)(C(=O)O)CC([O-])=O YXVFQADLFFNVDS-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229960001545 hydrotalcite Drugs 0.000 description 1
- 229910001701 hydrotalcite Inorganic materials 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- JTHNLKXLWOXOQK-UHFFFAOYSA-N n-propyl vinyl ketone Natural products CCCC(=O)C=C JTHNLKXLWOXOQK-UHFFFAOYSA-N 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- UOURRHZRLGCVDA-UHFFFAOYSA-D pentazinc;dicarbonate;hexahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Zn+2].[Zn+2].[Zn+2].[Zn+2].[Zn+2].[O-]C([O-])=O.[O-]C([O-])=O UOURRHZRLGCVDA-UHFFFAOYSA-D 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000011684 sodium molybdate Substances 0.000 description 1
- 235000015393 sodium molybdate Nutrition 0.000 description 1
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 description 1
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000013008 thixotropic agent Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
本発明は高い防食性を有する塗膜を形成することができる塗料、および当該塗料を塗布し表面に塗膜を有することで高い耐食性を有する被覆鋼材、および耐食性鋼材に関する。 The present invention relates to a paint that can form a coating film with high corrosion resistance, a coated steel material that has high corrosion resistance by applying the paint and having a coating film on the surface, and a corrosion-resistant steel material.
鋼材の防食分野において、特許文献１及び２に開示されるように、鋼材上に種々の成分を含む膜を形成し、当該膜中あるいは当該膜と鋼材との界面に防食酸化物層を形成させ、この酸化物層によって鋼材の耐食性が高まることが知られている。 In the field of corrosion protection for steel materials, as disclosed in Patent Documents 1 and 2, a film containing various components is formed on the steel material, and a corrosion-protective oxide layer is formed in the film or at the interface between the film and the steel material. It is known that this oxide layer increases the corrosion resistance of steel materials.
しかし、防食酸化物層を形成させる思想は一定の大きさで鋼材の腐食を伴うものであり、さらに耐食性を向上させることが望まれている。本発明は、上記事情に鑑みてなされたものであり、鋼材に高い防食性を与える塗料および高い耐食性を有する被覆鋼材、さらには高い耐食性を有する鋼材を提供することを目的とする。 However, the idea of forming an anti-corrosion oxide layer involves corrosion of the steel material with a certain size, and it is desired to further improve the corrosion resistance. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a coating material that provides high corrosion resistance to steel materials, a coated steel material that has high corrosion resistance, and further a steel material that has high corrosion resistance.
本発明の塗料を用いた被覆鋼材は、鋼材と、該鋼材の表面上に形成された塗膜と、を備え、前記塗膜は、粉体と、結着剤と、を含み、前記粉体は、炭酸ナトリウム及び／または炭酸カリウムと、アルカリ土類金属の少なくとも１種の酸化物及び／または水酸化物を含み、含有される前記粉体の質量が、含有される前記結着剤の質量の１０倍以下であり、前記塗膜の厚みが５～３００μｍである。鋼材は、表面に金属面が露出しているものでもよく、表面にあらかじめ錆層が形成されているものでもよく、表面にめっき層や塗膜を有するものでもよい。 A coated steel material using the paint of the present invention includes a steel material and a coating film formed on the surface of the steel material, the coating film containing powder and a binder, and the coating film containing the powder and a binder. contains sodium carbonate and/or potassium carbonate and at least one oxide and/or hydroxide of an alkaline earth metal, and the mass of the powder contained is equal to the mass of the binder contained. 10 times or less, and the thickness of the coating film is 5 to 300 μm. The steel material may have a metal surface exposed on its surface, may have a rust layer formed on its surface in advance, or may have a plating layer or a coating film on its surface.
上記被覆鋼材において、前記塗膜は、亜鉛及び亜鉛合金からなる群から選択される少なくとも１種の金属を含むことができる。 In the above-mentioned coated steel material, the coating film may contain at least one metal selected from the group consisting of zinc and zinc alloy.
また、上記被覆鋼材を構成する鋼材には、３質量％以下のアルカリ土類金属から選択される少なくとも１種の元素を含有することができる。それらの元素を含有する鋼材は、表面に塗膜を形成させ被覆を施さなくても一定の良好な耐食性を示すものである。 Further, the steel material constituting the coated steel material may contain at least one element selected from alkaline earth metals in an amount of 3% by mass or less. Steel materials containing these elements exhibit a certain level of good corrosion resistance even without coating by forming a coating on the surface.
本発明によれば、腐食反応により炭酸塩からなる防食生成物を生成でき、かつｐＨを高く維持することができるため高い耐食性を有する被覆鋼材、および当該被覆鋼材を作製するための塗料、ならびに耐食性鋼材を提供することができる。 According to the present invention, a coated steel material that can generate an anticorrosion product made of carbonate through a corrosion reaction and has high corrosion resistance because it can maintain a high pH, a paint for producing the coated steel material, and a coating material that has corrosion resistance. We can provide steel materials.
（鋼材）
本発明の鋼材の鋼種は特に限定されず、普通鋼材であってもよく、低合金鋼材であってもよく、高合金鋼材であってもよい。鋼材は、表面に鋼の金属面が露出していてもよく、表面にあらかじめ錆層が形成されていてもよく、表面にめっき層を有するめっき鋼材であってもよい。めっき層の例は、アルミニウム、亜鉛及びこれらの合金等の金属によるめっき層である。(Steel)
The steel type of the steel material of the present invention is not particularly limited, and may be ordinary steel, low alloy steel, or high alloy steel. The steel material may have a metal surface exposed on its surface, may have a rust layer formed on its surface in advance, or may be a plated steel material having a plating layer on its surface. Examples of the plating layer are plating layers made of metals such as aluminum, zinc, and alloys thereof.
なお、本発明の塗料塗布前に鋼材の表面を電動工具等で研磨してもよく、表面に錆層が形成されている場合にはワイヤーブラシ等で容易に除去できる錆を除去してもよく除去しなくてもよい。また、鋼材が表面に有機層あるいは無機層を有している場合、これらを除去してもよく、これらを含めて鋼材表面に塗膜を設けてもよい。 Note that before applying the paint of the present invention, the surface of the steel material may be polished with a power tool, etc., and if a rust layer is formed on the surface, the rust that can be easily removed with a wire brush etc. may be removed. Does not need to be removed. Furthermore, if the steel material has an organic layer or an inorganic layer on its surface, these may be removed, or a coating may be provided on the surface of the steel material including these layers.
（塗料および塗膜）
本発明の塗料および塗膜は、粉体と、結着剤と、を含み、この粉体は、炭酸ナトリウム及び／または炭酸カリウムと、アルカリ土類金属の少なくとも１種の酸化物及び／または水酸化物を含み、含有される前記粉体の質量は、含有される前記結着剤の質量の１０倍以下であることが望ましいが、５倍以下でもよく、３倍以下でもよい。粉体の質量を前記結着剤の質量の５倍以下に抑えると塗膜の密着性が向上することが期待できる。粉体の平均粒径は１００μｍ以下に調整することが望ましいが、さらに望ましくは６０μｍ以下であり、４０μｍ以下であると腐食環境中におかれた塗膜中における電気化学的不均一性を回避できるため好適である。(Paint and coating film)
The paint and coating film of the present invention contain powder and a binder, and the powder contains sodium carbonate and/or potassium carbonate, at least one oxide of an alkaline earth metal, and/or water. The mass of the powder containing the oxide is desirably 10 times or less the mass of the binder contained, but may be 5 times or less, or 3 times or less. When the mass of the powder is suppressed to 5 times or less the mass of the binder, it can be expected that the adhesion of the coating film will be improved. The average particle size of the powder is preferably adjusted to 100 μm or less, more preferably 60 μm or less, and if it is 40 μm or less, electrochemical non-uniformity in the coating film placed in a corrosive environment can be avoided. Therefore, it is suitable.
（炭酸ナトリウム、炭酸カリウム、アルカリ土類金属の酸化物と水酸化物）
本発明の塗料に添加された炭酸ナトリウムや炭酸カリウムと、アルカリ土類金属の酸化物や水酸化物は、当該塗料を用いて作製される塗膜中に存在し、当該塗膜を有する被覆鋼材が腐食環境にさらされた場合に塗膜に侵入する水に溶解し、炭酸イオンとアルカリ土類金属のカチオンが生成する。その結果、塗膜中および鋼材表面のｐＨが上昇し、例えばｐＨが１１以上になることにより不働態皮膜を生成するなどの効果により、鋼材の腐食が著しく抑制される。さらにｐＨが低い場合でも、ｐＨを８以上にできるため、生成するさび層の防食性が高まる。(Sodium carbonate, potassium carbonate, alkaline earth metal oxides and hydroxides)
The sodium carbonate and potassium carbonate and the alkaline earth metal oxides and hydroxides added to the paint of the present invention are present in the coating film produced using the paint, and the coated steel having the coating film is When exposed to a corrosive environment, it dissolves in water that enters the coating, producing carbonate ions and alkaline earth metal cations. As a result, the pH in the coating film and on the surface of the steel increases. For example, when the pH increases to 11 or more, a passive film is formed, thereby significantly suppressing corrosion of the steel. Furthermore, even when the pH is low, the pH can be raised to 8 or higher, which increases the anticorrosion properties of the formed rust layer.
また、炭酸イオンとアルカリ土類金属のカチオンが反応し、極めて難溶性のアルカリ土類金属の炭酸塩、例えば炭酸カルシウムや炭酸バリウムが鋼材表面に形成し、腐食環境、例えば塩化物イオンや水あるいは酸素などの侵入を強く抑制することにより、被覆鋼材の防食性が高まる。 In addition, carbonate ions and alkaline earth metal cations react, and extremely poorly soluble alkaline earth metal carbonates, such as calcium carbonate and barium carbonate, are formed on the surface of the steel material. By strongly suppressing the intrusion of oxygen, etc., the corrosion resistance of coated steel increases.
ここで、アルカリ土類金属の酸化物や水酸化物が水に溶解し生成するアルカリ土類金属のカチオンは、大気中の二酸化炭素が水に溶解し生成する炭酸イオンと反応しても炭酸塩を生成することができるが、二酸化炭素が水に溶解する段階で水素イオンが生成するため、塗膜中および鋼材表面のｐＨが低下し中性近づき鋼材の腐食が加速する。 Here, the alkaline earth metal cations produced when alkaline earth metal oxides and hydroxides dissolve in water will not react with the carbonate ions produced when carbon dioxide in the atmosphere dissolves in water. However, since hydrogen ions are generated when carbon dioxide is dissolved in water, the pH in the coating film and on the surface of the steel material decreases and approaches neutrality, accelerating the corrosion of the steel material.
本発明においては、二酸化炭素が塗膜中の水に多く溶解する前に、炭酸ナトリウムや炭酸カリウムが水に溶解し生成する炭酸イオンとアルカリ土類金属のカチオンを優先的に反応させることができるため、極めて難溶性なアルカリ土類金属の炭酸塩を早期に形成する点が重要であり、その結果、塗膜中の水に溶解することでｐＨを低下させ得る大気中の二酸化炭素の塗膜中への侵入を抑制することができる。なお、炭酸ナトリウムや炭酸カリウムとアルカリ土類金属の酸化物や水酸化物が水に溶解し炭酸塩を生成する反応は、例えば炭酸ナトリウムと酸化カルシウムを例にとると、
ＣａＯ＋Ｎａ２ＣＯ３＋Ｈ２Ｏ → ＣａＣＯ３＋２ＮａＯＨ
であり、難溶性の炭酸カルシウムが生成する副反応では強いアルカリ性を示す水酸化ナトリウムが生成するため、鋼材表面で強いアルカリ領域にあるｐＨの低下を招かない。同様の効果は炭酸ナトリウムを炭酸カリウムに置き換えても成立する。In the present invention, carbonate ions generated when sodium carbonate and potassium carbonate are dissolved in water can preferentially react with alkaline earth metal cations before a large amount of carbon dioxide dissolves in the water in the coating film. Therefore, it is important to quickly form carbonates of alkaline earth metals, which are extremely poorly soluble. Intrusion inside can be suppressed. In addition, the reaction in which sodium carbonate or potassium carbonate and alkaline earth metal oxides or hydroxides dissolve in water to produce carbonate is, for example, taking sodium carbonate and calcium oxide as an example.
CaO+ Na2CO3 + H2O → CaCO3 + 2NaOH
In the side reaction in which poorly soluble calcium carbonate is produced, highly alkaline sodium hydroxide is produced, so that the pH, which is in the strongly alkaline range, on the surface of the steel material does not decrease. A similar effect can be obtained by replacing sodium carbonate with potassium carbonate.
このような効果を得るために、炭酸ナトリウムと炭酸カリウムの合計添加量は例えば０．１～５０．０質量％であることができる。上記含有量が０．１質量％以上であることにより炭酸ナトリウムや炭酸カリウムによって奏される効果が得られやすくなる。また、上記含有量が５０．０質量％以下であることにより、塗膜の鋼材への密着性が得られやすくなる。 In order to obtain such an effect, the total amount of sodium carbonate and potassium carbonate added can be, for example, 0.1 to 50.0% by mass. When the content is 0.1% by mass or more, the effects produced by sodium carbonate and potassium carbonate can be easily obtained. Further, when the content is 50.0% by mass or less, adhesion of the coating film to the steel material can be easily obtained.
また、アルカリ土類金属の酸化物や水酸化物の合計添加量は、同様に０．１～５０．０質量％であることができる。 Further, the total amount of alkaline earth metal oxides and hydroxides added may similarly be 0.1 to 50.0% by mass.
炭酸ナトリウムと炭酸カリウムの合計添加量と、アルカリ土類金属の酸化物と水酸化物の合計添加量は、それぞれ、より好ましくは１．０～４０．０質量％であり、さらに好ましくは２．０～３０．０質量％である。 The total addition amount of sodium carbonate and potassium carbonate and the total addition amount of alkaline earth metal oxide and hydroxide are each more preferably 1.0 to 40.0% by mass, and even more preferably 2.0% by mass. It is 0 to 30.0% by mass.
また、炭酸ナトリウムと炭酸カリウムの合計添加量と、アルカリ土類金属の酸化物と水酸化物の合計添加量の比率が、前者を後者で除した値が０．２から５．０の範囲にすることが、反応に寄与するそれぞれのモル比を制御することができ好適である。さらに望ましくは、０．５から２．０の範囲が好適である。 In addition, the ratio of the total addition amount of sodium carbonate and potassium carbonate to the total addition amount of alkaline earth metal oxides and hydroxides, the former divided by the latter, is in the range of 0.2 to 5.0. It is preferable to control the molar ratio of each component contributing to the reaction. More preferably, the range is from 0.5 to 2.0.
なお、塗膜中に金属の硫酸塩が含有されると、腐食にともないアルカリ土類金属の難溶性の硫酸塩が生成し防食性に寄与するが、アルカリ土類金属の硫酸塩が生成されることにより、アルカリ土類金属の炭酸塩の生成を阻害する恐れがあり、また、金属の硫酸塩が加水分解するとｐＨを低下させる可能性が高く、一定の溶解度を有する金属の硫酸塩は含まない方が有利である場合がある。 Furthermore, when metal sulfates are contained in the coating film, sparingly soluble sulfates of alkaline earth metals are generated as a result of corrosion, contributing to corrosion protection, but sulfates of alkaline earth metals are also generated. This may inhibit the formation of alkaline earth metal carbonates, and hydrolysis of metal sulfates is likely to lower the pH, so do not include metal sulfates that have a certain solubility. may be more advantageous.
（亜鉛、亜鉛合金の粉末）
さらに、塗膜中には、亜鉛及び亜鉛合金からなる群から選択される少なくとも１種の金属を含むことができる。これらの金属粉体は、炭酸ナトリウムや炭酸カリウムが水に溶解し生成する炭酸イオンと反応し、塩基性炭酸亜鉛を生成することにより、腐食環境の塗膜への侵入を阻害し、防食性を高める効果を示す。これらの金属粉体の塗膜中の質量割合は、塗膜の密着性を阻害しない８８質量％以下であることが望ましく、８０質量％以下でもよく、７０質量％以下でも良く、３０質量％以下でもよく、５質量％以下でもよい。(zinc, zinc alloy powder)
Furthermore, the coating film may contain at least one metal selected from the group consisting of zinc and zinc alloys. These metal powders react with carbonate ions produced when sodium carbonate and potassium carbonate are dissolved in water, producing basic zinc carbonate, which prevents corrosive environments from penetrating the paint film and improves corrosion resistance. Shows the effect of increasing. The mass proportion of these metal powders in the coating film is preferably 88% by mass or less, which does not inhibit the adhesion of the coating film, may be 80% by mass or less, may be 70% by mass or less, and may be 30% by mass or less. It may be 5% by mass or less.
（鋼材への添加成分）
さらに、鋼材は３質量％以下のアルカリ土類金属から選択される少なくとも１種の元素を含有することができる。それらの元素を３質量％以上添加しても耐食性には効果を示すが、鋼材の強度靭性の低下を招く恐れがあり、添加量は３質量％以下、望ましくは２質量％以下、さらに望ましくは１質量％以下が好適である。アルカリ土類金属の鋼中での形態は、例えばそれらの酸化物であることができ、カルシウムやバリウムの酸化物が例示される。このようなアルカリ土類金属あるいはアルカリ土類金属の酸化物を含有する鋼材は、腐食反応にともないアルカリ土類金属のカチオンを生成し、炭酸ナトリウムなどが水に溶解し生成する炭酸イオンと反応することにより、防食的なアルカリ土類金属の炭酸塩を生成することで、鋼材の耐食性を向上させる。なお、それらのアルカリ土類金属やそれらの酸化物を含有する鋼材は、被覆を有さなくても腐食反応にともないアルカリ土類金属のカチオンを生成するため、鋼材表面をアルカリ性にして鋼材の耐食性を向上させる効果を有する。(Ingredients added to steel)
Furthermore, the steel material can contain at least one element selected from alkaline earth metals in an amount of 3% by mass or less. Adding 3% or more of these elements by mass will have an effect on corrosion resistance, but there is a risk of reducing the strength and toughness of the steel material, so the amount added should be 3% or less, preferably 2% or less, and more preferably 2% or less. The content is preferably 1% by mass or less. The form of alkaline earth metals in steel can be, for example, their oxides, such as calcium and barium oxides. Steel materials containing such alkaline earth metals or alkaline earth metal oxides generate alkaline earth metal cations as a result of corrosion reactions, which react with carbonate ions generated when sodium carbonate and other substances dissolve in water. This improves the corrosion resistance of steel by producing anti-corrosive alkaline earth metal carbonates. In addition, steel materials containing alkaline earth metals and their oxides generate alkaline earth metal cations as a result of corrosion reactions even if they are not coated, so the corrosion resistance of steel materials can be improved by making the surface of the steel alkaline. It has the effect of improving.
（樹脂）
本実施形態に係る塗料および塗膜はさらに結着剤を含むことができる。結着剤の例は樹脂であるが、樹脂としては、特に制限されず、ビニルブチラール樹脂（ポリビニルブチラール樹脂等）、エポキシ樹脂、変性エポキシ樹脂、ウレタン樹脂、アクリル樹脂、フタル酸樹脂、メラミン樹脂、ニトロセルロース樹脂、ビニル樹脂（ポリ塩化ビニル、ポリ酢酸ビニル、及びポリビニルアルコール等）、及びフッ素樹脂等が挙げられ、これらの樹脂の混合物であってもよい。また、これらの樹脂は溶剤系でも良く、水系でも良い。これらの樹脂は熱硬化性樹脂の硬化物であっても熱可塑性樹脂であってもよい。上記樹脂を含む塗料は必要に応じて硬化剤をさらに含むことができ、通常、塗料は乾燥中及び乾燥後に硬化する。熱硬化性樹脂の重量平均分子量は特に限定されないが、１００～２００００程度である。また、熱可塑性樹脂の重量平均分子量は特に限定されないが、１００００～５００００００程度である。(resin)
The paint and coating film according to this embodiment can further contain a binder. An example of the binder is a resin, but the resin is not particularly limited and includes vinyl butyral resin (polyvinyl butyral resin, etc.), epoxy resin, modified epoxy resin, urethane resin, acrylic resin, phthalic acid resin, melamine resin, Examples include nitrocellulose resin, vinyl resin (polyvinyl chloride, polyvinyl acetate, polyvinyl alcohol, etc.), and fluororesin, and mixtures of these resins may be used. Further, these resins may be solvent-based or water-based. These resins may be cured thermosetting resins or thermoplastic resins. The paint containing the above-mentioned resin can further contain a curing agent if necessary, and the paint usually hardens during and after drying. The weight average molecular weight of the thermosetting resin is not particularly limited, but is approximately 100 to 20,000. Further, the weight average molecular weight of the thermoplastic resin is not particularly limited, but is approximately 10,000 to 5,000,000.
（その他の成分）
塗膜は、必要に応じて、着色顔料、体質顔料、防錆顔料、リン酸、特殊機能顔料等の顔料、及び、分散剤、チキソ剤、及び酸化防止剤等の添加剤を含むことができる。また、特に塩化物対策が必要な場合、ハイドロカルマイト、ハイドロタルサイト、モリブデン酸ナトリウム、タングステン酸ナトリウムを含むことができる。これらの添加量は、例えば合計で６０質量％以下とすることができ、３０質量％以下とすることができ、５質量％以下とすることができる。(Other ingredients)
The coating film may contain pigments such as coloring pigments, extender pigments, antirust pigments, phosphoric acid, special functional pigments, and additives such as dispersants, thixotropic agents, and antioxidants, as necessary. . In addition, when measures against chloride are particularly required, hydrocalumite, hydrotalcite, sodium molybdate, and sodium tungstate can be included. The amount of these additions can be, for example, 60% by mass or less, 30% by mass or less, and 5% by mass or less in total.
本実施形態において、塗料に含まれる粒子状の材料の平均粒子径は８０μｍ以下であることができ、好ましくは４０μｍ以下である。 In this embodiment, the average particle diameter of the particulate material contained in the paint can be 80 μm or less, preferably 40 μm or less.
塗膜の厚みは、１～１０００μｍとすることができるが、厚さが５μｍ以上であることにより、塗膜中の各成分が鋼材上に十分保持される。また、塗膜の厚さが３００μｍ以下であることにより、経済的に有利であるばかりでなく、下地の鋼材に何らかの影響で発生した応力により塗膜に曲げモーメントが発生した場合でも塗膜の割れ又は鋼材表面からの剥離を抑制することができる。塗膜の厚さの下限値は、５μｍであってもよく、１０μｍであってもよく、２０μｍであってもよい。塗膜の厚さの上限値は、１００μｍであってもよく、２００μｍであってもよい。 The thickness of the coating film can be 1 to 1000 μm, but by having a thickness of 5 μm or more, each component in the coating film is sufficiently retained on the steel material. Furthermore, since the thickness of the coating film is 300 μm or less, it is not only economically advantageous, but also prevents the coating film from cracking even if a bending moment is generated in the coating film due to stress generated due to some influence on the underlying steel material. Alternatively, peeling from the surface of the steel material can be suppressed. The lower limit of the thickness of the coating film may be 5 μm, 10 μm, or 20 μm. The upper limit of the thickness of the coating film may be 100 μm or 200 μm.
（上塗膜）
また、上記の各被覆鋼材は、塗膜の上に設けられた上塗膜を有していていることができる。(Top coat)
Moreover, each of the above-mentioned coated steel materials can have an overcoat film provided on the coating film.
このような上塗膜が形成されることにより、意匠性を付与することが可能になるとともに、防食効果を補助することができ、鋼材の耐食性をさらに向上することが可能となる。上塗膜の厚さには特に制限はないが、３００μｍ以下に設定することが経済的に有利であり、２００μｍ以下でもよく、１００μｍ以下でもよい。上塗膜は具体的には樹脂膜が例示でき、各種顔料などの添加物を含んでいてもよい。樹脂は、ポリビニルブチラール樹脂、ポリエチレン樹脂、エポキシ樹脂、ポリビニルアルコール樹脂、又はこれらの混合物等であることができる。 By forming such an overcoat film, it becomes possible to impart design properties, and also to assist in the anticorrosion effect, thereby making it possible to further improve the corrosion resistance of the steel material. The thickness of the top coating film is not particularly limited, but it is economically advantageous to set it to 300 μm or less, and it may be 200 μm or less, or 100 μm or less. A specific example of the top coating film is a resin film, and may contain additives such as various pigments. The resin can be a polyvinyl butyral resin, a polyethylene resin, an epoxy resin, a polyvinyl alcohol resin, a mixture thereof, or the like.
（被覆鋼材の製造方法）
このような被覆鋼材は例えば、各層の構成成分を含有する塗料を調製し、塗布し、乾燥させることで製造できる。塗料の調整時には適宜溶剤を使用することができる。(Method for manufacturing coated steel)
Such a coated steel material can be manufactured, for example, by preparing a paint containing the constituent components of each layer, applying it, and drying it. A solvent can be used as appropriate when preparing the paint.
（溶剤）
溶剤の例は、としては、イソプロピルアルコール及びノルマルブタノール等の炭素数３以上のアルコール系、キシレン及びトルエン等の芳香族系、並びに、酢酸エチル等のエステル系等の非水系溶剤；水、メチルアルコール及びエチルアルコール等の水系溶剤である。(solvent)
Examples of solvents include alcohols with 3 or more carbon atoms such as isopropyl alcohol and n-butanol, aromatic solvents such as xylene and toluene, and non-aqueous solvents such as esters such as ethyl acetate; water, methyl alcohol. and aqueous solvents such as ethyl alcohol.
２０℃においてＢ型粘度計によって測定される塗料の粘度は、例えば１００～２０００ｃｐｓであることができる。塗料中の溶剤の含有量は、塗料の粘度が上記範囲となるように調整することができる。 The viscosity of the paint, measured by a Type B viscometer at 20° C., can be, for example, 100 to 2000 cps. The content of the solvent in the paint can be adjusted so that the viscosity of the paint falls within the above range.
塗料の塗布方法としては、刷毛塗り及びローラー塗り、エアスプレー、エアレススプレー等が挙げられる。また、上記塗料の乾燥は、例えば、常温常圧の空気中での自然乾燥等により行われる。乾燥時間は、通常１時間～８時間程度である。上記塗布方法によれば、被覆鋼材が使用される現場での塗布もでき、現場での鋼材の切断及び溶接等の加工後にも対応できる。各膜は、塗料を１回塗布することにより得られるが、複数回重ねて塗布することもできる。 Examples of the coating method include brush coating, roller coating, air spray, and airless spray. Further, the above-mentioned paint is dried by, for example, natural drying in air at room temperature and pressure. Drying time is usually about 1 to 8 hours. According to the above coating method, coating can be performed at the site where the coated steel material is used, and it can also be applied after processing such as cutting and welding of the steel material at the site. Each film is obtained by applying a single coat of paint, but it is also possible to apply multiple coats.
本発明の被覆鋼材あるいは鋼材は、一般腐食環境のみならず、塩化物を含む厳しい腐食環境やｐＨが低下する環境においてもその効果を発揮するものである。 The coated steel material or steel material of the present invention exhibits its effects not only in a general corrosive environment but also in a severe corrosive environment containing chlorides and an environment where the pH decreases.
以下、実施例を示して、本発明をさらに具体的に説明するが、本発明はこれらの実施例に限定されるものではなく、本発明の技術的思想を逸脱しない範囲で種々の変更が可能である。 Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples, and various changes can be made without departing from the technical idea of the present invention. It is.
＜鋼材の準備＞
鉄以外に、０．０５質量％の炭素、０．０２質量％のケイ素，０．３５質量％のマンガン、０．００５質量％のリン、０．００３質量％の硫黄を含み、７０×１５０×３ｍｍの寸法を有する鋼材Ａを準備した。また、０．１質量％のＣａＯ，１．０質量％のＣａＯ，０．１質量％のＢａＯ，１．０質量％のＢａＯをさらに添加した同じ寸法を有する鋼材を準備し、それぞれ鋼材Ｂ，鋼材Ｃ，鋼材Ｄ，鋼材Ｅとした。それぞれの鋼材の表面は、研磨により、黒皮、汚れ、錆等が除去され、表面に清浄な金属表面を有していた。<Preparation of steel materials>
In addition to iron, it contains 0.05% by mass of carbon, 0.02% by mass of silicon, 0.35% by mass of manganese, 0.005% by mass of phosphorus, and 0.003% by mass of sulfur, 70×150× Steel material A having a dimension of 3 mm was prepared. In addition, steel materials having the same dimensions were prepared with further additions of 0.1% by mass of CaO, 1.0% by mass of CaO, 0.1% by mass of BaO, and 1.0% by mass of BaO, respectively. Steel material C, steel material D, and steel material E were used. The surface of each steel material was polished to remove black scale, dirt, rust, etc., and had a clean metal surface.
＜塗料の調製＞
表１～表４に示す組成の塗膜を作製するためにそれぞれの金属化合物および金属の粉体、樹脂を用いた結着剤を、溶剤として適当量のキシレン、トルエン及びイソプロピルアルコールとともに混合し、塗料を作製した。その際、体質顔料として腐食反応に関与しない硫酸バリウムを適宜添加した。当該塗料を用いて鋼材表面にエアレススプレーで塗膜を作製した。塗膜作成時の温度は２５℃、相対湿度は４０％であった。塗料および塗膜に用いた結着剤には樹脂αあるいは樹脂βを用いた。樹脂αはポリビニルブチラール（積水化学（株）製のエスレックＢ、分子量２５，０００）であり、樹脂βはエポキシ樹脂（三菱化学（株）製のエピコート、エポキシ当量１６０～１７０）でポリアミノアミド樹脂を添加することにより硬化させた。塗膜作製後７日間常温空気中で乾燥させることにより、被覆鋼材を得た。乾燥後の各塗膜の１０点平均厚さも表１～表４に示す。なお、被覆していない鋼材も一部用意した。<Preparation of paint>
In order to produce coating films with the compositions shown in Tables 1 to 4, the respective metal compounds, metal powders, and binders using resin are mixed with appropriate amounts of xylene, toluene, and isopropyl alcohol as solvents, The paint was made. At that time, barium sulfate, which does not participate in corrosion reactions, was appropriately added as an extender. Using the paint, a coating film was created on the surface of the steel material by airless spraying. The temperature during coating film creation was 25° C. and the relative humidity was 40%. Resin α or resin β was used as the binder for the paint and coating film. The resin α is polyvinyl butyral (S-LEC B manufactured by Sekisui Chemical Co., Ltd., molecular weight 25,000), and the resin β is an epoxy resin (Epicoat manufactured by Mitsubishi Chemical Co., Ltd., epoxy equivalent weight 160-170), which is a polyaminoamide resin. It was cured by adding it. A coated steel material was obtained by drying the coating film in air at room temperature for 7 days after the coating film was prepared. The 10-point average thickness of each coating film after drying is also shown in Tables 1 to 4. In addition, some uncoated steel materials were also prepared.
＜腐食試験＞
得られた各種鋼材を以下の連続する（ａ）（ｂ）（ｃ）（（ｃ）の後（ａ）に戻る）の工程からなる腐食試験サイクルに２年間供した。
（ａ）温度５０℃、相対湿度９５％の環境に６時間、鋼材を水平に静置する。
（ｂ）２５℃の腐食液に１時間鋼材を浸漬する。
（ｃ）温度６０℃、相対湿度５０％の環境に１７時間、鋼材を水平に静置する。
ここで、腐食液は０．５％ＮａＣｌ＋０．１％ＣａＣｌ２＋０．０７５％ＮａＨＣＯ３の水溶液である。なお、土日祝日はサイクル（ｃ）のまま保持した。<Corrosion test>
The various steel materials obtained were subjected to a corrosion test cycle for two years consisting of the following consecutive steps (a), (b), and (c) (returning to (a) after (c)).
(a) The steel material is left horizontally in an environment with a temperature of 50° C. and a relative humidity of 95% for 6 hours.
(b) Immerse the steel material in a corrosive solution at 25°C for 1 hour.
(c) The steel material is left horizontally in an environment with a temperature of 60° C. and a relative humidity of 50% for 17 hours.
Here, the etchant is an aqueous solution of 0.5% NaCl + 0.1% CaCl 2 + 0.075% NaHCO 3 . Note that cycle (c) was maintained on weekends and holidays.
＜耐腐食性評価＞
試験終了後、塗膜剥離剤による表面の塗膜と、クエン酸二アンモニウム及び微量の腐食抑制液の混合水溶液中に浸漬することにより腐食生成物の除去を行い、金属表面を露出させた。金属露出後の鋼材の質量と、腐食試験前の鋼材の質量とを比較することにより、腐食試験前後での鋼材の板厚減少量を求め耐食性を評価した。なお、鋼材厚さの減少量は、鋼材厚さが、鋼材の全表面で均一に減少していると仮定して求めたものである。<Corrosion resistance evaluation>
After the test, the metal surface was exposed by removing the paint film on the surface with a paint film remover and immersing it in a mixed aqueous solution of diammonium citrate and a trace amount of corrosion inhibiting liquid. By comparing the mass of the steel material after metal exposure with the mass of the steel material before the corrosion test, the amount of reduction in the plate thickness of the steel material before and after the corrosion test was determined and the corrosion resistance was evaluated. Note that the amount of decrease in the steel material thickness was determined on the assumption that the steel material thickness is uniformly reduced over the entire surface of the steel material.
＜腐食試験結果＞
腐食試験結果を表１～表４に示す。比較例である試験番号０～１２では、試験終了直後の鋼材表面は鉄さび層などによる腐食生成物に全面が覆われており、塗膜と腐食生成物を除去する操作を行った後も、容易には除去しきれず表面に鉄さび層がわずかに残存していたため、さらに除去する操作を鉄さび層が除去できるまで継続した。この間に母材の鋼材が溶解しないことは確認している。これらの比較例においては一定の板厚減少量が認められ、鋼材の腐食が進行し鉄さび層が生成していたと考えられる。特に試験番号０の被覆していない鋼材Ａは大きな板厚減少量を示し、激しく腐食した。<Corrosion test results>
The corrosion test results are shown in Tables 1 to 4. In test numbers 0 to 12, which are comparative examples, the entire surface of the steel material immediately after the test was covered with corrosion products such as a layer of iron rust, and even after the operation to remove the coating film and corrosion products, the surface of the steel material was easily covered. Since the iron rust layer could not be completely removed and a slight layer of iron rust remained on the surface, further removal operations were continued until the iron rust layer could be removed. It has been confirmed that the base steel does not melt during this time. In these comparative examples, a certain amount of plate thickness reduction was observed, and it is thought that corrosion of the steel material progressed and an iron rust layer was formed. In particular, uncoated steel material A with test number 0 showed a large decrease in plate thickness and was severely corroded.
一方、本発明の実施例である試験番号１３～４５の被覆鋼材の板厚減少量は極めて小さく、鋼材の耐食性が非常に高いことがわかる。これらの被覆鋼材の塗膜と腐食生成物を除去する操作中に鉄さび層の生成が伺える痕跡は見られなかった。 On the other hand, the reduction in plate thickness of the coated steel materials in test numbers 13 to 45, which are examples of the present invention, was extremely small, indicating that the corrosion resistance of the steel materials was extremely high. No trace of iron rust layer formation was observed during the operation of removing the coating film and corrosion products from these coated steel materials.
なお、本発明の実施例の被覆鋼材について試験終了直後の表面をそのまま乾燥させ、Ｘ線回折装置（株式会社リガク製ＲＩＮＴ－ＵｌｔｉｍａＩＩＩ）を用いて低角入射Ｘ線回折測定を、Ｃｕターゲットで４０ｋＶ－４０ｍＡの条件で行った結果、防食性を高める炭酸塩の存在が認められた。 In addition, the surface of the coated steel material of the example of the present invention was dried as it was immediately after the test, and low-angle incidence X-ray diffraction measurement was performed using an X-ray diffraction device (RINT-Ultima III manufactured by Rigaku Co., Ltd.) at 40 kV with a Cu target. As a result of carrying out the test under the condition of -40 mA, the presence of carbonate, which enhances corrosion resistance, was observed.
また、試験番号４６～４９に示す、被覆していない鋼材Ｂ，鋼材Ｃ，鋼材Ｄ，鋼材Ｅの腐食試験結果から、これらの鋼材の板厚減少量は鋼材Ａのそれに比べると非常に小さく、ＣａＯやＢａＯを鋼材に添加することで耐食性が向上することが明らかとなった。 In addition, from the corrosion test results of uncoated steel B, steel C, steel D, and steel E shown in test numbers 46 to 49, the amount of reduction in plate thickness of these steel materials is very small compared to that of steel material A. It has become clear that corrosion resistance is improved by adding CaO or BaO to steel materials.
以上のように、本発明により、鋼材に高い防食性を与える塗料および高い耐食性を有する被覆鋼材、さらには高い耐食性を有する鋼材を提供することができる。 As described above, the present invention can provide a coating material that imparts high corrosion resistance to steel materials, a coated steel material that has high corrosion resistance, and furthermore, a steel material that has high corrosion resistance.
Claims (12)
前記粉体は、炭酸ナトリウム及び／または炭酸カリウムと、アルカリ土類金属の少なくとも１種の酸化物及び／または水酸化物を含み、
含有される前記粉体の質量が、含有される前記結着剤の質量の１０倍以下である、塗料。A paint containing powder and a binder,
The powder contains sodium carbonate and/or potassium carbonate and at least one oxide and/or hydroxide of an alkaline earth metal,
A coating material in which the mass of the powder contained is 10 times or less the mass of the binder contained.
前記塗膜は、粉体と、結着剤と、を含み、
前記粉体は、炭酸ナトリウム及び／または炭酸カリウムと、アルカリ土類金属の少なくとも１種の酸化物及び／または水酸化物を含み、含有される前記粉体の質量が、含有される前記結着剤の質量の１０倍以下であり、
前記塗膜の厚みが５～３００μｍである、被覆鋼材。comprising a steel material and a coating film formed on the surface of the steel material,
The coating film includes powder and a binder,
The powder contains sodium carbonate and/or potassium carbonate, and at least one oxide and/or hydroxide of an alkaline earth metal, and the mass of the powder contained is equal to the amount of the binder contained. 10 times or less the mass of the agent,
A coated steel material, wherein the coating film has a thickness of 5 to 300 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022066616A JP2023145293A (en) | 2022-03-28 | 2022-03-28 | Coating material and steel material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022066616A JP2023145293A (en) | 2022-03-28 | 2022-03-28 | Coating material and steel material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2023145293A true JP2023145293A (en) | 2023-10-11 |
Family
ID=88253540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2022066616A Pending JP2023145293A (en) | 2022-03-28 | 2022-03-28 | Coating material and steel material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2023145293A (en) |
-
2022
- 2022-03-28 JP JP2022066616A patent/JP2023145293A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3130057B2 (en) | Organic coatings, especially for active metals, using ion-reactive pigments | |
| JP5681332B2 (en) | Paint and coated steel | |
| JP6609725B2 (en) | Reactive paint for steel that provides high corrosion resistance | |
| JP4637978B2 (en) | Corrosion-resistant paint and corrosion-resistant steel material coated with the same | |
| JP2009078263A (en) | Metallic member being subjected to rust-preventive treatment and coating paint | |
| JP3345023B2 (en) | Surface treatment agent for steel and surface treated steel | |
| JP5186644B2 (en) | Anticorrosion film and anticorrosion paint | |
| JP2007284600A (en) | Coating composition containing high corrosion-proof zinc powder | |
| JP2006083464A (en) | Rust-preventive metallic component, and its manufacturing method | |
| JP2006272768A (en) | Surface-treated metal sheet | |
| JP4455712B2 (en) | Coated steel with atmospheric corrosion resistance | |
| JP6587775B2 (en) | Paint and coated steel | |
| JP2023145293A (en) | Coating material and steel material | |
| US20220298364A1 (en) | Corrosion-Inhibiting Coatings for Metal Mesh Gaskets and Metallic Particles | |
| KR100727694B1 (en) | Surface-treated metal sheet and surface-treating agent | |
| JP3414269B2 (en) | Surface-treated steel with excellent weather resistance | |
| KR100979950B1 (en) | Chromium-Free Surface Treatment Composition for Zn-coated steel sheet | |
| JP6623543B2 (en) | Organic resin coated steel | |
| WO2021206048A1 (en) | Coating material and coated steel material | |
| JP6376912B2 (en) | Rust treatment agent for galvanized steel and repair method using the same | |
| JP3607188B2 (en) | Weather-resistant surface-treated steel and treatment method | |
| JP3642511B2 (en) | Organic resin paint and surface-treated steel | |
| JP3997809B2 (en) | Anticorrosion surface treatment method and steel | |
| JP2020169379A (en) | Coated steel material | |
| JP2001234351A (en) | Coated steel excellent in corrosion resistance |