CN1210874A - Inorganic coating - Google Patents
Inorganic coating Download PDFInfo
- Publication number
- CN1210874A CN1210874A CN 97107671 CN97107671A CN1210874A CN 1210874 A CN1210874 A CN 1210874A CN 97107671 CN97107671 CN 97107671 CN 97107671 A CN97107671 A CN 97107671A CN 1210874 A CN1210874 A CN 1210874A
- Authority
- CN
- China
- Prior art keywords
- coating
- zinc
- aluminum
- phosphate
- powder
- 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.)
- Granted
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 221
- 239000011248 coating agent Substances 0.000 title claims abstract description 194
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000011701 zinc Substances 0.000 claims abstract description 53
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 53
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 36
- 239000000843 powder Substances 0.000 claims abstract description 36
- 239000010452 phosphate Substances 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 22
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003973 paint Substances 0.000 claims abstract description 15
- 239000000853 adhesive Substances 0.000 claims abstract description 11
- 230000001070 adhesive effect Effects 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- 229910003480 inorganic solid Inorganic materials 0.000 claims abstract description 6
- 239000002253 acid Substances 0.000 claims abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 65
- 229910052782 aluminium Inorganic materials 0.000 claims description 47
- 239000007788 liquid Substances 0.000 claims description 35
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 30
- 239000011230 binding agent Substances 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 22
- 238000005260 corrosion Methods 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 230000007797 corrosion Effects 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 15
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 14
- 230000002378 acidificating effect Effects 0.000 claims description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 229910021645 metal ion Inorganic materials 0.000 claims description 11
- 239000000758 substrate Substances 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 150000002576 ketones Chemical class 0.000 claims description 10
- 239000000395 magnesium oxide Substances 0.000 claims description 10
- 239000002736 nonionic surfactant Substances 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 10
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- -1 polyoxyethylene Polymers 0.000 claims description 9
- 150000002739 metals Chemical class 0.000 claims description 8
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 7
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 7
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 7
- 239000011651 chromium Substances 0.000 claims description 7
- 239000011777 magnesium Substances 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 5
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 5
- 239000012670 alkaline solution Substances 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910001430 chromium ion Inorganic materials 0.000 claims description 5
- 239000003112 inhibitor Substances 0.000 claims description 5
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 4
- 229910052582 BN Inorganic materials 0.000 claims description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 4
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 4
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 claims description 4
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 claims description 4
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 4
- 150000003013 phosphoric acid derivatives Chemical class 0.000 claims description 4
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 4
- NVKTUNLPFJHLCG-UHFFFAOYSA-N strontium chromate Chemical compound [Sr+2].[O-][Cr]([O-])(=O)=O NVKTUNLPFJHLCG-UHFFFAOYSA-N 0.000 claims description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 3
- 239000008199 coating composition Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- NDKWCCLKSWNDBG-UHFFFAOYSA-N zinc;dioxido(dioxo)chromium Chemical compound [Zn+2].[O-][Cr]([O-])(=O)=O NDKWCCLKSWNDBG-UHFFFAOYSA-N 0.000 claims description 3
- 229910001316 Ag alloy Inorganic materials 0.000 claims description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims description 2
- 239000003125 aqueous solvent Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 claims description 2
- 150000002191 fatty alcohols Chemical class 0.000 claims description 2
- PHTQWCKDNZKARW-UHFFFAOYSA-N isoamylol Chemical compound CC(C)CCO PHTQWCKDNZKARW-UHFFFAOYSA-N 0.000 claims description 2
- 229910000464 lead oxide Inorganic materials 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 150000004767 nitrides Chemical class 0.000 claims description 2
- 229920005862 polyol Polymers 0.000 claims description 2
- 150000003077 polyols Chemical class 0.000 claims description 2
- 229910021332 silicide Inorganic materials 0.000 claims description 2
- 229910052712 strontium Inorganic materials 0.000 claims description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 2
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000701 coagulant Substances 0.000 claims 2
- 229910000838 Al alloy Inorganic materials 0.000 claims 1
- 229910000861 Mg alloy Inorganic materials 0.000 claims 1
- 230000001476 alcoholic effect Effects 0.000 claims 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims 1
- 150000001845 chromium compounds Chemical class 0.000 claims 1
- 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 1
- 239000003292 glue Substances 0.000 claims 1
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 claims 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims 1
- 239000000347 magnesium hydroxide Substances 0.000 claims 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims 1
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 claims 1
- 239000004137 magnesium phosphate Substances 0.000 claims 1
- 229960002261 magnesium phosphate Drugs 0.000 claims 1
- 229910000157 magnesium phosphate Inorganic materials 0.000 claims 1
- 235000010994 magnesium phosphates Nutrition 0.000 claims 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 claims 1
- 150000001247 metal acetylides Chemical class 0.000 claims 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims 1
- 159000000008 strontium salts Chemical class 0.000 claims 1
- 239000000454 talc Substances 0.000 claims 1
- 229910052623 talc Inorganic materials 0.000 claims 1
- 150000003751 zinc Chemical class 0.000 claims 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 claims 1
- 229940007718 zinc hydroxide Drugs 0.000 claims 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 claims 1
- 239000011787 zinc oxide Substances 0.000 claims 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims 1
- 229910000165 zinc phosphate Inorganic materials 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 32
- 239000010959 steel Substances 0.000 abstract description 32
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 16
- 239000004576 sand Substances 0.000 abstract description 3
- 238000007591 painting process Methods 0.000 abstract 1
- 235000021317 phosphate Nutrition 0.000 description 27
- 238000012360 testing method Methods 0.000 description 17
- 238000006243 chemical reaction Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000000956 alloy Substances 0.000 description 9
- 230000015271 coagulation Effects 0.000 description 9
- 238000005345 coagulation Methods 0.000 description 9
- 238000001723 curing Methods 0.000 description 9
- 238000009472 formulation Methods 0.000 description 9
- 238000004210 cathodic protection Methods 0.000 description 8
- 239000010410 layer Substances 0.000 description 8
- 230000001737 promoting effect Effects 0.000 description 8
- 238000009835 boiling Methods 0.000 description 7
- 230000001050 lubricating effect Effects 0.000 description 7
- 239000003921 oil Substances 0.000 description 7
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 6
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 6
- 239000004411 aluminium Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 4
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical class [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- DHEQXMRUPNDRPG-UHFFFAOYSA-N strontium nitrate Chemical compound [Sr+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O DHEQXMRUPNDRPG-UHFFFAOYSA-N 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 150000001298 alcohols Chemical class 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 229910052755 nonmetal Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 150000001844 chromium Chemical class 0.000 description 2
- OOUMMVQQCICTGF-UHFFFAOYSA-K chromium(3+);dihydrogen phosphate Chemical compound [Cr+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O OOUMMVQQCICTGF-UHFFFAOYSA-K 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- MOUPNEIJQCETIW-UHFFFAOYSA-N lead chromate Chemical compound [Pb+2].[O-][Cr]([O-])(=O)=O MOUPNEIJQCETIW-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910001463 metal phosphate Inorganic materials 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- MCSXGCZMEPXKIW-UHFFFAOYSA-N 3-hydroxy-4-[(4-methyl-2-nitrophenyl)diazenyl]-N-(3-nitrophenyl)naphthalene-2-carboxamide Chemical compound Cc1ccc(N=Nc2c(O)c(cc3ccccc23)C(=O)Nc2cccc(c2)[N+]([O-])=O)c(c1)[N+]([O-])=O MCSXGCZMEPXKIW-UHFFFAOYSA-N 0.000 description 1
- 229910017119 AlPO Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 229920000388 Polyphosphate Polymers 0.000 description 1
- 239000004111 Potassium silicate Substances 0.000 description 1
- 241000221535 Pucciniales Species 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 150000008043 acidic salts Chemical class 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-M dihydrogenphosphate Chemical compound OP(O)([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-M 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- ZOIVSVWBENBHNT-UHFFFAOYSA-N dizinc;silicate Chemical compound [Zn+2].[Zn+2].[O-][Si]([O-])([O-])[O-] ZOIVSVWBENBHNT-UHFFFAOYSA-N 0.000 description 1
- QFXZANXYUCUTQH-UHFFFAOYSA-N ethynol Chemical group OC#C QFXZANXYUCUTQH-UHFFFAOYSA-N 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 229910052909 inorganic silicate Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- RLJMLMKIBZAXJO-UHFFFAOYSA-N lead nitrate Chemical compound [O-][N+](=O)O[Pb]O[N+]([O-])=O RLJMLMKIBZAXJO-UHFFFAOYSA-N 0.000 description 1
- 238000013035 low temperature curing Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- QQFLQYOOQVLGTQ-UHFFFAOYSA-L magnesium;dihydrogen phosphate Chemical compound [Mg+2].OP(O)([O-])=O.OP(O)([O-])=O QQFLQYOOQVLGTQ-UHFFFAOYSA-L 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229910000401 monomagnesium phosphate Inorganic materials 0.000 description 1
- 235000019785 monomagnesium phosphate Nutrition 0.000 description 1
- 239000004482 other powder Substances 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000001205 polyphosphate Substances 0.000 description 1
- 235000011176 polyphosphates Nutrition 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical class [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
Abstract
Inorganic paint consists of acid phosphate as the main component of adhesive and inorganic solid particles and it can become dry and cure at room temperature. The coating comprising the said adhesive and zinc or alumimium powder is used as victimized anode coating for iron and steel, and has excellent heat resistance, electric conductivity and cathode protecting function. The paint may be used directly onto the surface of iron and steel parts without sand blast treatment, and it can convert the surface rust or oxide film into paint component. The present invention simplifies the painting process and is suitable for protection of large iron and steel members.
Description
The present invention belongs to an inorganic paint, particularly to a paint which is composed of inorganic solid particles and acidic phosphate and can be dried and hardened at room temperature. It has excellent performances of corrosion resistance, heat resistance, electric conduction and the like, and has wide applicability.
In modern industrial society, metal corrosion is a serious problem, especially in large steel components used in severe corrosive environments, the painting methods usually adopted are not satisfactory for protection, and more effective measures must be taken.
Cathodic protection technology has long been used successfully in the field of corrosion protection of large steel components used in underwater or underground wet environments, but common cathodic protection is not effective for sites where large steel parts are on water or where the corrosive medium is discontinuous, where protection with sacrificial anodic coatings, which also serve as cathodic protection, is the most effective method. Hot dip galvanization (aluminum or zinc-aluminum alloy) is one example of a sacrificial anodic coating. Although it works well against corrosion of steel, it is difficult to implement large steel components, and the entire component must be carefully designed because each component can be hot-dip galvanized (aluminum or zinc-aluminum alloy) and then assembled. The component is hot dip galvanized (aluminum or zinc-aluminum alloy). Welding or other processing can not be carried out, otherwise, the damage of the plating layer is difficult to repair. Thermal spray zinc (or aluminum) is another example of a sacrificial anode coating. Although it can be used for integrally spraying assembled components, it is difficult to implement large steel components. Therefore people have hope ofInorganic zinc-rich coatings that cure spontaneously at room temperature. British patent 958787 and us patent 4219358 are two examples of such coatings. The inorganic zinc-rich coating has negative potential of zinc, so the inorganic zinc-rich coating is also a sacrificial anode coating, but the actual effect of the inorganic zinc-rich coating for large steel members is not ideal, and the reason is as follows: the first reason is that the coating has too high a resistance and thus the cathodic protection function is not fully performed, especially when the resistance of the corrosive medium is also high [ the bulk resistivity of the inorganic zinc-rich coating is 104～107Omega m, and the volume resistivity of the hot dip galvanized steel (aluminum or zinc-aluminum alloy) is less than 0.1 omega m](ii) a The second reason is that the bonding of the inorganic zinc-rich coating and the substrate is a mechanical occlusion, and no chemical bonding or metallurgical bonding exists, so that the steel member is required to be subjected to strict sand blasting coarsening and surface cleaning before coating, including strict oil removal and rust removal, which are difficult to achieve for large steel members in practice, such as sand blasting of concave areas such as groove gaps of the large steel member is difficult to achieve, rust is difficult to completely remove, the existing inorganic zinc-rich coating is difficult to adhere firmly in the areas, the development of rust in the areas can not be effectively inhibited, and finally the coating is also bubbled and falls off; the third reason is that the inorganic zinc-rich coating adopts silicate binder, which has poor toughness, is brittle, is easy to crack and fall off when being thick, and can only be coated thinly, thereby shortening the protection life. In response to the difficulty in thoroughly descaling large steel components, a coating called a primer with rust has come into force, and chinese patent CN87102047 and british patent GB2160877 are two examples of such coatings. The paint can react with the iron rust on the surface of steel (dissolving rust), so that the steel can be coated with rust, the process of blowing sand to remove rust is omitted, and the surface cleaning operation before coating is greatly simplified. However, the coating does not have the function of cathodic protection and has low corrosion resistance, so the coating can not meet the requirement of long-term protection of large steel components.
Us patent 3248251 discloses an inorganic aluminum coating (hereinafter referred to as inorganic aluminum coating) invented by Allen (Allen), which is a coating composed of phosphates, chromates and aluminum powders of +2 and +3 valent metals, is an inorganic (sacrificial) anode coating with excellent performance, and is widely used for protection of various steel parts of aircraft engines. It has excellent conductivity, and the volume resistivity of the coating is less than 1 omega.m, which is ten thousandth to ten thousandth of the volume resistivity of the inorganic zinc-rich coating. Its adhesion, toughness, heat resistance, oxidation resistance, oil resistance and anticorrosion ability are far superior to the inorganic zinc-rich coating and other anticorrosion coatings. Although it is as inorganic as the zinc rich coating, the binder of the former is phosphate and the binder of the latter is silicate, which is the main reason why the former is superior in performance to the latter. It is known that the phosphorization of steel is a surface treatment technology for steel parts, the iron phosphate salt protective film formed by the chemical reaction of the steel surface and phosphate plays a role in protecting, and the main function is to improve the binding force of the substrate and paint, the phosphate in the inorganic aluminum coating also plays a role in chemical binding with steel, but the silicate zinc-rich coating cannot play a role. The binding power of the phosphate inorganic coating is thus superior to that of the silicate inorganic coating
The main disadvantage of the inorganic aluminum coating is that it can not dry and solidify at room temperature like inorganic zinc-rich coatings, it must be heated to 650 ° F for solidification, and the solidified coating needs to be post-treated (glass bead blasting or reheating to 1000 ° F) for electrical conduction to have the function of cathodic protection. Such heating and post-treatment of large steel components is very difficult, thus limiting the range of applications.
The main purpose of the present invention is to create a coating composition and coating technique that has conductivity, cathodic protection, corrosion resistance, heat and oil resistance similar to those of the inorganic aluminum coatings, can be dried and cured at room temperature as well as the existing inorganic zinc-rich coatings, does not require harsh pretreatment of the coatings like the rusty primer, and can dissolve the slight rust on the steel surface and convert it into a coating composition. Therefore, the coating of the present invention is a new-generation inorganic coating which integrates the respective advantages of the three existing coatings. Other objects andadvantages of the present invention will be discussed later and will be described in some examples of use.
Observing the chemical reaction in the curing process of the inorganic aluminum coating of the Ironlily invention, the hexavalent chromium salt (namely chromate) originally contained in the coating can be almost completely reduced by the aluminum powder in the coating in the heating curing process and converted into trivalent chromium salt. The following ion equation can be used to express: as a result of the redox, a large amount of metal cations Cl is added to the coating3+And Al3+While H is+Greatly reduces the change of acidity to neutrality of the coating. The weakening of acidity causes the original acidic dihydrogen phosphate (i.e. the primary phosphate) contained in the coating which is easily soluble in water to be converted into water-insoluble neutral ortho phosphate (i.e. the tertiary phosphate), and simultaneously, the hexavalent chromium salt which is easily soluble in water is also converted into water-insoluble trivalent chromium salt, so that the coating is completely cured. Although there are also chemical changes from simple phosphates to complex polyphosphates during heating, their chemical reaction is similar to that of orthophosphates and still changes from soluble acidic salts to insoluble neutral salts. The oxidation-reduction reaction is completed under the condition of heating, and the aluminum powder is in a passivation state under the action of the hexavalent chromium salt at room temperature, so that the coating is also in a stable state and cannot be solidified. It is envisaged that if chromates are eliminated from the above coating, the aqueous acidic phosphate solution of the +2 and +3 valent metals will react with the aluminium powder (or zinc powder) at room temperature to form water-insoluble neutral compounds. The reaction of the acidic phosphate of a divalent metal (denoted by M) with the aluminum powder is now exemplified as follows:
the difficulty is that the chemical reaction is difficult to control, the acidic solution has no passivation effect on aluminum (or zinc), so that the reaction between the solution and aluminum (or zinc) is fast, and the chemical reaction is completed before the solvent water is not volatilized in the process of preparing the coating or just before the coating is coated on a substrate, so that the coating becomes a pile of water-insoluble waste residues and completely loses the adhesion.
It has been found that if the ratio of the phosphate content to the +2, +3 valent metal ion content in the acidic phosphate is maintained within a suitable range, the acidic phosphate can be dispersed or dissolved in a liquid alcohol, or a mixture of a liquid alcohol and water, or a mixture of a liquid alcohol, a liquid ketone and water, to form a viscous gel. The paint formed by mixing the aluminum powder, the zinc powder or other solid powder as a binder can keep a stable state in a storage tank for a period of time, namely the service life (also called the pot life) of the paint, and the coating operation can be completed in the period of time. The existence of liquid alcohol can delay the speed of chemical reaction between acid phosphate and aluminum (or zinc) powder or other powder, and the liquid ketone mainly acts to accelerate the volatilization speed of the solvent. When the coating is applied to a substrate, chemical reactions between the components of the coating are gradually accelerated as the solvent evaporates, and the coating dries and hardens. By adjusting the content of each component in the binder, the self-dryingand hardening (or curing) speed of the coating at room temperature and the service life of the coating can be effectively controlled.
In the binder, the mole ratio of phosphate radical to +2 and +3 valent metal ions is selected within the range of 1.4-9: 1, when the mole ratio of phosphate radical content to +2 and +3 valent metal ions is larger, the acidity of the coating is larger, and when the mole ratio is smaller, the weakness of the coating is weaker, for a steel substrate with rusty surface, a coating with high acidity is preferably coated firstly, for example, a coating with phosphate radical and +2 and +3 valent metal ions with the mole ratio of 9: 1 (binder formula IV), the coating has strong iron rust dissolving and converting effect, and after the coating is dried moderately, an acidic coating is coated (for example, a binder in formula I, wherein the mole ratio of phosphate radical to +2 and +3 valent metal ions is 5.88: 1). For passive solid particles, it is preferred to use a less acidic binder to formulate the coating. It is also desirable to coat non-metallic substrates or to coat passive metallic substrates with coatings having low acidity (e.g., as in formulation five)A binder, wherein the mole ratio of phosphate radical to +2 and +3 valence metal ions is 1.4: 1). For the more acidic binders, anhydrous or low-water liquid alcohols (or mixtures of low-water liquid alcohols and liquid ketones) are preferably used. This can extend the useful life of the coating. The coating is prepared using a weakly acidic binder, which has a low reaction rate with aluminum (or zinc) powder or other powders, in which case the coating can be prepared using either liquid alcohol or an aqueous solution of a nonionic surfactant containing no or a small amount of alcohol as a dispersant for the +2 and +3 valent metal phosphate. The nonionic surfactant functions to improve the dispersion effect of phosphate in a solvent and to improve the wettability and adhesion of a coating material.Among them, polyoxyethylene fatty alcohol ether is a preferable nonionic surfactant. In order to prolong the service life of the coating and improve the anti-corrosion effect, a metal corrosion inhibitor can be added into the coating, and the dosage of the metal corrosion inhibitor is less than 1molL, for example, hexavalent chromium compounds, such as chromic anhydride, chromate or dichromate, are added.
The +2 and +3 valent metal ions in the binder are mainly metal ions such as chromium, magnesium, zinc, calcium, strontium, aluminum, iron, manganese and the like, wherein the chromium is selected from the +3 valent chromium ions or the +3 valent chromium ions obtained by reducing the +6 valent chromium in a phosphoric acid solution by using a reducing agent. The liquid alcohol in the binder is selected from ethanol, methanol, n-propanol, isopropanol, n-butanol, isobutanol, n-pentanol, isopentanol, and liquid polyols, and the like, and mixtures thereof. The liquid ketone in the binder is selected from the group consisting of acetone, butanone, cyclohexanone, and the like, and mixtures thereof. The solvent content in the binder can be changed according to different requirements, and for the superfine solid particles with low density and small particle size, thinner binder is preferably used for preparing the coating, and the solvent content can be up to 95% of the binder content in some cases. Phosphate [ (PO) in binder4)3-]The content of (A) is 0.5 to 10molThe total amount of metal ions having a valence of 0.056 to 6.2molL, dissolvingThe content of the agent is 5-95%, in the solvent, 0-99.5% of liquid alcohol, no more than 40% of liquid ketone, no more than 2% of nonionic surfactant and the balance of water. In aqueous solvents free of alcohols and ketones, nonionic surfactantsThe content of the surfactant is not less than 0.01%.
The solid particles in the coating are metal powder such as magnesium, zinc, aluminum and the like or alloy powder based on the metals and passivated zinc powder or zinc alloy powder, zinc-coated aluminum powder and zinc-infiltrated aluminum powder for the anti-corrosion coating, graphite powder, silver or silver alloy powder, copper or copper alloy powder, zinc or zinc alloy powder and other conductive powder for the conductive coating, graphite, boron nitride, molybdenum disulfide, tungsten disulfide, talcum powder, lead oxide and other lubricating powder for the solid lubricating coating, and refractory oxide, refractory nitride, refractory carbide, refractory silicide and other heat-resistant powder for the heat-resistant coating. The paint may also contain superfine powder of zinc, aluminum, magnesium and other metal oxide, hydroxide or phosphate with diameter less than 1 micron for regulating the viscosity and curing the paint. In order to improve the corrosion resistance life of the coating, corrosion inhibitors, such as strontium chromate, zinc chromate or lead chromate, can be added into the coating to slow down the sacrificial loss of aluminum, zinc, magnesium and alloys thereof. All solid particles should pass through a 100 mesh screen, preferably a 325 mesh screen. The amount of the solid particles is determined according to different purposes, and the amount of the solid particles required to be added per liter of the binder is selected within the range of 10-2000 g, preferably 300-1000 g. For bonding, a smaller quantity of solid particles is used, for example only 10g per litre of binder.
After the metal (or alloy) powder of zinc, aluminum, magnesium and the like in the solid particles and the oxide and hydroxide powder of the metals react with the adhesive liquid, acidic primary phosphate in the adhesive liquid is converted into secondary phosphate (equation ②), and then the acidic primary phosphate is converted into completely water-insoluble tertiary phosphate (equation ③). The first step conversion is faster, and the second step conversion is slower.
The technical effect of the present invention is discussed below in connection with a coating process. The first advantage is that the coating process of the present invention is simple and convenient, and thus it has a very wide range of applications. The coating can dissolve slight rust or oxidation film and trace oil stain and water, so that sand blowing treatment on a base material before coating is allowed to be avoided, and the coating can be self-dried and cured at room temperature, so that the coating process is greatly simplified. The coating is coated by adopting a brush or spray method, the number of the coated layers and the thickness of the coating are determined according to actual requirements, the phenomenon that the coating is thick and can crack and fall off as the existing silicate zinc-rich coating does not exist, and the coating can be repeatedly coated according to the actual requirements to obtain a very thick coating, so that the higher cathode protection life is obtained. After the paint prepared by zinc powder is coated, the coating is dried and hardened after being placed in the air at room temperature for a plurality of minutes, and the coating is cured after about 2 hours. In order to accelerate or ensure the complete curing of the coating, a layer of coagulation promoting liquid can be coated on the surface of the coating after the coating is coated for 1-2 hours, and the coating is completely cured after 10-20 minutes. The zinc coating has good conductivity after room temperature curing. The aluminum coating is low in curing speed, after the aluminum coating is coated, the aluminum coating is dried and hardened at room temperature for about 1-2 hours, a layer of coagulation promoting liquid is coated after about 20 hours, and then the aluminum coating is completely cured after 20-30 minutes. In order to accelerate the curing speed of the aluminum coating, the dried and hardened aluminum coating can be rapidly heated to 400-650 DEG F, and the coating can be completely cured within a few minutes. The aluminium coating solidified by the method still has no electric conduction because of the compact oxide film on the surface of the aluminium powder, and the coating can be quickly heated to be close to the melting point of aluminium by adopting various heat sources, so that the aluminium coating can be electrically conducted within a few seconds. If the pure aluminum powder is replaced by the aluminum-zinc alloy powder, the zinc-coated aluminum powder or the zinc-infiltrated aluminum powder, the coating can have conductivity after being cured at room temperature, and has the advantages of both an aluminum coating and a zinc coating. The cured coating is not only insoluble in cold water and boiling water, but also resistant to long-term soaking in various organic media without swelling or deterioration. The coatings also have high heat resistance (e.g., the aluminum coatings of the present invention have a heat resistance of up to 1100F), oxidation resistance, and non-aging properties, which are comparable to organic coatings. The volume resistivity of the aluminum coating and the zinc coating is only 1 omega.m, is ten thousandth to ten thousandth of the volume resistivity of the existing inorganic zinc-rich coating, and due to the high conductivity and negative potential of the coating, the excellent cathode protection function is obtained.
The results of the performance measurements of the zinc coating and the aluminum coating of the present invention are presented below:
⑴ referring to the current inorganic aluminum coating technical conditions, the zinc coating and the aluminum coating of the invention are examined for their performance, except that the zinc coating has slightly lower heat resistance (because the melting point of zinc is lower than that of aluminum), all other properties meet or exceed the technical indexes of the current inorganic aluminum coating, and are detailed in the following table:
the coating is examined according to the current technical standard of aluminum coating
⑵ comparison of practical observations of the zinc coating of the invention and existing inorganic (silicate) zinc-rich coatings in an industrial atmospheric environment:
| Test items | Current technical index of inorganic aluminium coating | Results of coating test of the invention | |
| Zinc coating | Aluminum coating | ||
| Adhesion force | The coating is not loosened or peeled off when bent by 90 DEG | Qualified | Qualified |
| Heat resistance | 700 ℃ F. for 23 hours +1075 ° F4 hours, coating Without cracking or bubbling | 700°F 23 hours +780°F 4 hours Coating integrity | 700°F 23 hours +1075°F 4 hours Qualified |
| Hot water resistance | Boiling in water for 10 min, without cracking and foaming， No component is dissolved, and the adhesive force is still qualified | Boiling in boiling water for 60 min Qualified clock | Boiling in boiling water for 60 min Qualified |
| Fuel resistance | After the fuel oil is soaked for 4 hours, the adhesion force is still appropriate Grid (C) | Soaking for 1000 hours Is qualified | Soaking for 1000 hours Qualified |
| Hot oil resistance | Hot oil at 400 deg.C for 8 hr without peeling Does not bubble | Qualified | Qualified |
| Corrosion resistance | Coating compositionThe layer is cut along the diagonal of the test piece X-shaped, salt spray is sprayed for 100 hours, no corrosion of base metal | 1000 hours is close to Grid (C) | Qualified in 1000 hours |
two 70X 5X 0.3cm hot-rolled medium carbon steel strips, one of which is coated with the zinc coating of the invention and the other of which is coated with an inorganic silicate zinc-rich coating, are originally slightly rusted on the surface. The thickness of the two coatings is about 60 mu m, the steel strip coated with the silicate zinc-rich coating has a plurality of iron rusts and coating bubbles after being stored for three and a half years in an industrial urban atmospheric environment with the annual average relative humidity of 80 percent, the steel strip coated with the zinc coating has no rust, and the coating is intact as before.
The coating of the invention can be made into a corrosion-resistant coating, and can be made into other coatings with special functions by replacing the zinc powder or the aluminum powder with other solid powder according to different requirements. For example,graphite, molybdenum disulfide, boron nitride or other lubricating powder can be prepared into a high-temperature lubricating coating by using the binder of the invention; silver powder, graphite, copper powder, zinc powder or other conductive powder can be mixed to prepare the conductive coating; refractory oxide powders or other heat resistant powders are blended to form a heat resistant coating. These coatings have the common feature of low temperature cure and high temperature application, and can be applied not only to metals, but also to non-metallic substrates, such as plastics, glass or ceramics, and thus the present invention has a very wide range of applications.
The following describes some embodiments of the invention, which are merely exemplary representations, and do not contain the full scope of the invention, and therefore should not be construed as limiting the invention.
(1) Preparation of the Binder
Formulation I
Chromium dihydrogen phosphate [ Cr (H)2PO4)3]0.15mol
Phosphoric acid (H)3PO4) 0.55mol
0.02mol of magnesium oxide (MgO)
Water (H)2O) 30g
Adding ethanol (C) after the dissolution is finished2H5OH) to 1L
Formulation II
Aluminum phosphate (AlPO)4) 0.26mol
Magnesium dihydrogen phosphate [ Mg (H)2PO4)2·3H20]0.04mol
Phosphoric acid (H)3PO4) 0.66mol
0.03mol of zinc oxide (ZnO)
Water (H)2O) 11g
Ethanol (C)2H5OH) to 1L
Formulation III
Phosphoric acid (H)3PO)42.3mol
Aluminum hydroxide [ Al (OH)3]1.2mol
0.05mol of magnesium oxide (MgO)
0.2mol of zinc oxide (ZnO)
Nonionic surfactant [ RO (CH)2CH2O-)n-H]0.2g
Water (H)2O) to 1L
Formulation IV
Chromium dihydrogen phosphate [ Cr (H)2PO4)3]0.15mol
Phosphoric acid (H)3PO4) 1.08mol
0.02mol of magnesium oxide (MgO)
Water (H)2O) 30g
Adding ethanol (C) after the dissolution is finished2H5OH) to 1L
Recipe five
Phosphoric acid (H)3PO)42mol
Aluminum hydroxide [ Al (OH)3]1.2mol
0.03mol of magnesium oxide (MgO)
0.2mol of zinc oxide (ZnO)
Nonionic surfactant [ RO (CH)2CH2O-)n-H]0.2g
Water (H)2O) to 1L
(2) Preparation of gel-promoting liquid
Formulation I
Ethylene diamine (H)2NCH2CH2NH2) 10g
Water (H)2O) 20g
70g of industrial ethanol
Formulation II
Solution A and solution B
Chromic anhydride (CrO)3) 10g strontium nitrate [ Sr (NO)3)2]40g
Sodium hydroxide (NaOH) 10g Water (H)2O) 60g
Water (H)2O) 80g
Coating the solution A on the coating, drying, and coating the solution B. The second formula not only acts as an accelerator, but also can fill strontium chromate precipitates in the pores of the coating, thereby delaying the sacrificial loss of zinc or aluminum. The strontium nitrate in the solution B can be zinc nitrate[Zn(NO3)2]Or lead nitrate [ Pb (NO)3)2]Instead, the formation of zinc chromate or lead chromate precipitates in the pores of the coating plays the same role.
Formulation III
Sodium carbonate (Na)2CO3) 15g
Water (H)2O) to 100ml
Formulation IV
Saturated potassium carbonate (K)2CO3) Aqueous solution
Besides the four formulas, other various alkaline liquids with the pH value of 8-14, including aqueous solutions, alcohol solutions, other alkaline solutions and mixed solutions of the aqueous solutions, the alcohol solutions and the other alkaline solutions can be used as coagulation promoters.
(3) Examples of the application of the coating
Example one
1L of adhesive (according to formula I)
900g of zinc powder (particle size 5-10 μm)
After being stirred uniformly, the mixture is coated on 5 carbon steel test pieces with light rust, and the thickness of the coating is about 45-55 mu m. And (3) placing the coating in air at room temperature for 2 hours, then coating a layer of coagulation promoting liquid, airing for 20 minutes, wiping off residual liquid, and measuring the volume resistivity to be 0.6-1 omega-m. 2 test pieces are taken and boiled in boiling water for one hour, and the coating is intact. The remaining three pieces were marked with an "X" on the coating with a sharp instrument until the matrix steel was exposed, placed in a 5% NaCl salt spray cabinet at 95 ℃ F. and no rust appeared over 1000 hours.
Example two
Binder (according to formula II) 1L
330g of aluminum powder (spherical aluminum powder with particle size of 4-5 mu m)
After being stirred uniformly, the mixture is coated on 8 carbon steel test pieces with the thickness of 1mm, and the thickness of the coating is about 55-65 mu m. Drying at room temperature for 1 hour until the coating is dried and hardened and the nail cannot be scraped off, quickly burning the test piece to deep red by oxyacetylene flame, measuring the resistivity of the coating layer to be about 0.2-0.5 omega.m after cooling, bending 2 test pieces along the curvature with the diameter of 8mm for 90 degrees, and preventing the coating from falling off. Another 3 test pieces were subjected to the salt spray test for 1000 hours under the same conditions as in example 1 to prevent the occurrence of rust. The remaining 3 test pieces were subjected to a heat resistance test and baked at 1050 ℃ F. for 100 hours to leave the coating intact.
EXAMPLE III
Binder (according to formula II) 1L
Graphite (colloidal powder) 200g
0.2mol of magnesium oxide (particle size less than 1 μm)
0.15mol of aluminum hydroxide (particle size less than 1 μm)
500ml of ethanol
The coating is coated on the surface of nonmetal such as ceramics, glass or plastics, is placed for 24 hours at room temperature, is coated with a layer of coagulation promoting liquid (according to the formula IV) and is dried in the air, and the coating has good electric conduction and lubricating effect. The graphite coating coated on the ceramic can resist 1500 DEG F high temperature.
Example four
500g of boron nitride is used for replacing 200g of graphite to be coated on heat-resistant steel, the coating process is the same as that of example 3, the coating has good lubricating and antifriction effects, and the coating can resist 1800 DEG F50 hours and does not crack.
EXAMPLE five
500g of molybdenum disulfide is used for replacing graphite and is coated on a steel piece, the coating process is the same as that of example 3, and the coating has good lubricating and antifriction effects.
EXAMPLE six
600g of alumina is used for replacing graphite and is coated on stainless steel, the coating process is the same as that of the embodiment 3, and the coating can resist the high temperature of more than 1500 ℃ F and has the heat insulation effect.
EXAMPLE seven
The zinc powder was replaced by 700g (95% Zn 5% AL) of a zinc-aluminum alloy powder, and the corrosion resistance of the coating was superior to that of the zinc coating in the same manner as in example 1.
Example eight
460g (55% AL, 43.5% Zn, 1.5% Si) of a zinc-aluminum alloy powder was used in place of 330g of the aluminum powder, and the procedure was otherwise as in example 2. The properties of the coating are very similar to those of the aluminum coating of example 2, but the cathodic protection function is superior to that of the aluminum coating in a corrosive medium without chloride ions.
Example nine
The addition of 2g of strontium chromate in example 1, otherwise the same as in example 1, extended the protective life of the zinc coating.
Example ten
The formula of the paint is the same as that of example 1, but after the paint is coated and aired in air at room temperature for 2 hours, no coagulation promoting liquid is coated, a current potassium silicate zinc-rich coating is thinly coated on the coating, and the mutual coagulation promoting effect is realized by utilizing the different pH values of the two coatings.
EXAMPLE eleven
Binder (according to formula II) 1L
Silver powder (325 mesh) 1330g
Zinc powder (325 mesh) 6.4g
24g of aluminum hydroxide (colloidal powder)
And coating the coating on a non-metal substrate such as ceramic, plastic or glass, placing the non-metal substrate in air at room temperature for 24-72 hours after coating, coating a layer of coagulation promoting liquid (according to the formula IV), and scrubbing away coagulation promoting liquid residues after drying and curing, wherein the coating is good in conductivity.
Example twelve
The steel test piece is soaked in gasoline containing 0.1% of mechanical lubricating oil for a moment, a thin oil film is formed on the test piece after the steel test piece is taken out and dried, and the salt spray test is carried out after the coating is coated according to the same coating and method as the example 1, and the effect is the same as the example 1.
EXAMPLE thirteen
The test pieces coated with the coatings according to examples 1 and 2 were immersed in kerosene for 3000 hours and then taken out, the coatings were intact as before,
in the fourteenth embodiment, the adhesive (based on the third formula) 1L of aluminum powder (spherical aluminum powder with the particle size of 4-5 μm) has the same effect as the second embodiment except for 750 g.
Claims (12)
1. The paint consists of adhesive and inorganic solid particle, and features that the adhesive is prepared through dispersing the acid phosphate of +2 and +3 valent metals in solvent comprising liquid alcohol, liquid ketone and water solution of non-ionic surfactant to form adhesive glue, mixing the adhesive with the inorganic solid particle, coating on substrate, and drying and hardening to form the coating.
2. The coating composition of claim 1, wherein the acidic phosphate salts of metals having a valence of +2 and +3 are selected from acidic phosphate salts of metals such as magnesium, zinc, aluminum, calcium, strontium, iron, manganese, chromium, and mixtures thereof, and wherein the chromium is selected from the group consisting of +3 chromium ions or +3 chromium ions obtained by reducing +6 chromium ions in a phosphoric acid solution with a reducing agent.
3. The coating of claim1 wherein the nonionic surfactant is a polyoxyethylene fatty alcohol ether [ RO (CH)2CH2O-)n-H]。
4. The coating of claim 1, wherein the metal corrosion inhibitor is present in an amount less than 1mol/L。
5. The coating of claim 4 wherein the added metal corrosion inhibitor is a +6 valent chromium compound selected from the group consisting of chromic anhydride, chromic acid, chromate, and dichromate.
6. The coating of claim 1 wherein the binder is phosphate [ (PO)4)3-]The content of (A) is 0.5 to 10molThe total amount of metal ions having a valence of 0.056 to 6.2molThe solvent content is 5-95%, and the amount of inorganic solid particles to be blended per liter of binder is 10-2000 g.
7. The coating of claim 1 wherein the solvent comprises 0 to 99.5% liquid alcohol, no more than 40% liquid ketone, no more than 2% nonionic surfactant, and the balance water. In the aqueous solvent containing no alcohol and ketone, the content of the nonionic surfactant is not less than 0.01%.
8. The coating of claim 1, wherein the molar ratio of phosphate to the total of +2 and +3 valent metal ions in the binder is 1.4-9: 1.
9. The coating of claim 1 wherein the liquid alcohol is selected from the group consisting of ethanol, methanol, n-propanol, isopropanol, n-butanol, isobutanol, n-pentanol, isopentanol, and liquid polyols, and mixtures thereof, and wherein the liquid ketone is selected from the group consisting of acetone, butanone, cyclohexanone, and mixtures thereof.
10. The coating of claim 1 wherein the inorganic solid particles are selected from the group consisting of aluminum powder, aluminum alloy powder, zinc alloy powder, magnesium alloy powder, silver alloy powder, copper alloy powder, passivated zinc alloy powder, zinc coated aluminum powder, zinc infiltrated aluminum powder, graphite, molybdenum disulfide, tungsten disulfide, talc, lead oxide, boron nitride, magnesium oxide, magnesium hydroxide, zinc oxide, zinc hydroxide, aluminum oxide, aluminum hydroxide, magnesium phosphate, zinc phosphate, aluminum phosphate, strontium chromate, zinc chromate, refractory oxides, refractory nitrides, refractory carbides, refractory silicides, and mixtures of two or more of the foregoing solid particles. All solid particles should be able to pass through a 100 mesh screen.
11. The coating of claim 1, wherein the coating is applied, dried and cured, and then a thin layer of a coagulant is applied to the surface of the coating to accelerate the curing process of the coating, wherein the coagulant is an alkaline liquid having a pH of 8 to 14 and is selected from the group consisting of alkaline aqueous solutions, alkaline alcoholic solutions, other alkaline solutions, and mixtures thereof.
12. An accelerating solution as set forth in claim 11 which is an alkaline solution of a mixture of an alkaline solution and a soluble chromate solution, which is applied to the coating and dried, followed by applying an aqueous solution selected from the group consisting of soluble strontium salts, soluble zinc salts and soluble lead salts, thereby forming insoluble chromate precipitates in the pores of the coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97107671A CN1085709C (en) | 1997-09-09 | 1997-09-09 | Inorganic coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97107671A CN1085709C (en) | 1997-09-09 | 1997-09-09 | Inorganic coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1210874A true CN1210874A (en) | 1999-03-17 |
| CN1085709C CN1085709C (en) | 2002-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97107671A Expired - Fee Related CN1085709C (en) | 1997-09-09 | 1997-09-09 | Inorganic coating |
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| Country | Link |
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| CN (1) | CN1085709C (en) |
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