CN111020653A - Surface treatment process for high-strength corrosion-resistant fastener - Google Patents
Surface treatment process for high-strength corrosion-resistant fastener Download PDFInfo
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- CN111020653A CN111020653A CN201911277436.4A CN201911277436A CN111020653A CN 111020653 A CN111020653 A CN 111020653A CN 201911277436 A CN201911277436 A CN 201911277436A CN 111020653 A CN111020653 A CN 111020653A
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- fastener
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- temperature
- washing
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Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000007797 corrosion Effects 0.000 title claims abstract description 24
- 238000005260 corrosion Methods 0.000 title claims abstract description 24
- 238000004381 surface treatment Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 79
- 238000005406 washing Methods 0.000 claims abstract description 35
- 238000005422 blasting Methods 0.000 claims abstract description 22
- 238000005238 degreasing Methods 0.000 claims abstract description 22
- 238000009713 electroplating Methods 0.000 claims abstract description 19
- 238000005246 galvanizing Methods 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000011010 flushing procedure Methods 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000007598 dipping method Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 238000004806 packaging method and process Methods 0.000 claims abstract description 6
- 238000005554 pickling Methods 0.000 claims abstract description 6
- 239000000243 solution Substances 0.000 claims description 42
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims description 21
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 20
- PVNIIMVLHYAWGP-UHFFFAOYSA-N Niacin Chemical compound OC(=O)C1=CC=CN=C1 PVNIIMVLHYAWGP-UHFFFAOYSA-N 0.000 claims description 20
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 20
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 20
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 20
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 17
- 229910052725 zinc Inorganic materials 0.000 claims description 17
- 239000011701 zinc Substances 0.000 claims description 17
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 15
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 claims description 15
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 claims description 15
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 238000007747 plating Methods 0.000 claims description 12
- BWHOZHOGCMHOBV-UHFFFAOYSA-N Benzalacetone Natural products CC(=O)C=CC1=CC=CC=C1 BWHOZHOGCMHOBV-UHFFFAOYSA-N 0.000 claims description 10
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 10
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 10
- 230000003213 activating effect Effects 0.000 claims description 10
- 235000019270 ammonium chloride Nutrition 0.000 claims description 10
- VYLVYHXQOHJDJL-UHFFFAOYSA-K cerium trichloride Chemical compound Cl[Ce](Cl)Cl VYLVYHXQOHJDJL-UHFFFAOYSA-K 0.000 claims description 10
- ICAKDTKJOYSXGC-UHFFFAOYSA-K lanthanum(iii) chloride Chemical compound Cl[La](Cl)Cl ICAKDTKJOYSXGC-UHFFFAOYSA-K 0.000 claims description 10
- 229960003512 nicotinic acid Drugs 0.000 claims description 10
- 235000001968 nicotinic acid Nutrition 0.000 claims description 10
- 239000011664 nicotinic acid Substances 0.000 claims description 10
- 239000003960 organic solvent Substances 0.000 claims description 10
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 claims description 10
- -1 rare earth chloride Chemical class 0.000 claims description 10
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 claims description 10
- 239000004299 sodium benzoate Substances 0.000 claims description 10
- 235000010234 sodium benzoate Nutrition 0.000 claims description 10
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000004094 surface-active agent Substances 0.000 claims description 10
- QHGNHLZPVBIIPX-UHFFFAOYSA-N tin(ii) oxide Chemical compound [Sn]=O QHGNHLZPVBIIPX-UHFFFAOYSA-N 0.000 claims description 10
- BWHOZHOGCMHOBV-BQYQJAHWSA-N trans-benzylideneacetone Chemical compound CC(=O)\C=C\C1=CC=CC=C1 BWHOZHOGCMHOBV-BQYQJAHWSA-N 0.000 claims description 10
- 239000011592 zinc chloride Substances 0.000 claims description 10
- 235000005074 zinc chloride Nutrition 0.000 claims description 10
- 238000005282 brightening Methods 0.000 claims description 9
- 238000009833 condensation Methods 0.000 claims description 9
- 230000005494 condensation Effects 0.000 claims description 9
- 239000004902 Softening Agent Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 claims description 5
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 5
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 claims description 5
- KEZYHIPQRGTUDU-UHFFFAOYSA-N 2-[dithiocarboxy(methyl)amino]acetic acid Chemical compound SC(=S)N(C)CC(O)=O KEZYHIPQRGTUDU-UHFFFAOYSA-N 0.000 claims description 5
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 claims description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 claims description 5
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- 229920002472 Starch Polymers 0.000 claims description 5
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 5
- CNERRGRDMYRHEV-UHFFFAOYSA-H [Cl-].[La+3].[Ce+3].[Cl-].[Cl-].[Cl-].[Cl-].[Cl-] Chemical compound [Cl-].[La+3].[Ce+3].[Cl-].[Cl-].[Cl-].[Cl-].[Cl-] CNERRGRDMYRHEV-UHFFFAOYSA-H 0.000 claims description 5
- 239000000654 additive Substances 0.000 claims description 5
- 230000000996 additive effect Effects 0.000 claims description 5
- 239000002518 antifoaming agent Substances 0.000 claims description 5
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 5
- 239000004327 boric acid Substances 0.000 claims description 5
- WYYQVWLEPYFFLP-UHFFFAOYSA-K chromium(3+);triacetate Chemical compound [Cr+3].CC([O-])=O.CC([O-])=O.CC([O-])=O WYYQVWLEPYFFLP-UHFFFAOYSA-K 0.000 claims description 5
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 claims description 5
- STNGULMWFPMOCE-UHFFFAOYSA-N ethyl 4-butyl-3,5-dimethyl-1h-pyrrole-2-carboxylate Chemical compound CCCCC1=C(C)NC(C(=O)OCC)=C1C STNGULMWFPMOCE-UHFFFAOYSA-N 0.000 claims description 5
- 239000011790 ferrous sulphate Substances 0.000 claims description 5
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 5
- 239000011737 fluorine Substances 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims description 5
- 238000007654 immersion Methods 0.000 claims description 5
- 239000003112 inhibitor Substances 0.000 claims description 5
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 5
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 229910017604 nitric acid Inorganic materials 0.000 claims description 5
- CMOAHYOGLLEOGO-UHFFFAOYSA-N oxozirconium;dihydrochloride Chemical compound Cl.Cl.[Zr]=O CMOAHYOGLLEOGO-UHFFFAOYSA-N 0.000 claims description 5
- 239000001103 potassium chloride Substances 0.000 claims description 5
- 235000011164 potassium chloride Nutrition 0.000 claims description 5
- 150000002910 rare earth metals Chemical group 0.000 claims description 5
- 239000011775 sodium fluoride Substances 0.000 claims description 5
- 235000013024 sodium fluoride Nutrition 0.000 claims description 5
- 239000000176 sodium gluconate Substances 0.000 claims description 5
- 235000012207 sodium gluconate Nutrition 0.000 claims description 5
- 229940005574 sodium gluconate Drugs 0.000 claims description 5
- PHIQPXBZDGYJOG-UHFFFAOYSA-N sodium silicate nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-][Si]([O-])=O PHIQPXBZDGYJOG-UHFFFAOYSA-N 0.000 claims description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 5
- RYCLIXPGLDDLTM-UHFFFAOYSA-J tetrapotassium;phosphonato phosphate Chemical compound [K+].[K+].[K+].[K+].[O-]P([O-])(=O)OP([O-])([O-])=O RYCLIXPGLDDLTM-UHFFFAOYSA-J 0.000 claims description 5
- 238000002161 passivation Methods 0.000 abstract description 2
- 230000004913 activation Effects 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention discloses a surface treatment process of a high-strength corrosion-resistant fastener, which comprises the following steps: carrying out water bath on the fastener, removing oil after the water bath, taking out and washing; performing shot blasting treatment on the fastener; performing electrolytic degreasing on the fastener subjected to shot blasting, and then washing; pickling the washed fastener; carrying out water bath on the pickled fastener; flushing the fastener after water bath by using high-temperature steam; completely immersing the fastener in a galvanizing solution with the temperature of 35-40 ℃ for electroplating; washing with water after electroplating; immersing the fastener in an activation solution; washing with water; completely electroplating the fastener again; phosphating the galvanized metal component; removing excess liquid from the surface of the fastener; putting the fastener after the galvanization cooling into an oven for heating; immersing the fastener into a passivating solution for passivation; cleaning the passivated fastener; drying the fastener after washing by hot air; carrying out a water wax dipping process on the washed fastener; and (6) packaging.
Description
Technical Field
The invention belongs to the technical field of fastener surface treatment, and particularly relates to a high-strength corrosion-resistant fastener surface treatment process.
Background
The traditional surface treatment process flow generally comprises oil removal, acid cleaning rust removal, zinc plating and passivation, and because in the acid cleaning rust removal process, hydrogen can be generated by the reaction of iron and acid and permeates into parts, the parts can generate pretightening force in the assembly process, and the parts are easy to be hydrogen-embrittled under the action of the pretightening force.
In addition, the fastener is easy to rust due to the using environment of the fastener and the characteristics of the metal of the fastener, so that the service life of the fastener is shortened, and even safety accidents occur.
Disclosure of Invention
The object of the present invention is to provide a surface treatment process for a high-strength corrosion-resistant fastener, which is intended to overcome the problems of the background art.
In order to solve the technical problem, the invention aims to realize that:
a surface treatment process for a high-strength corrosion-resistant fastener comprises the following steps:
s1: firstly, carrying out water bath on the machined and formed fastener by water at the temperature of 80-100 ℃, then carrying out oil removal treatment on the fastener, taking out the fastener and washing the fastener by clean water;
s2: performing shot blasting treatment on the fastener, wherein the shot blasting material is steel shot, and the shot blasting time is 15-25min, so that the surface of the fastener is steel gray;
s3, performing electrolytic degreasing on the fastener after shot blasting, wherein the degreasing temperature is as follows: at 70-80 ℃, the current density is: 85A/dm 2-90A/dm 2 for 20-25 min;
s4: the fastener after electrolytic degreasing is washed by flowing water, the fastener is fully stirred in the washing process, and the washing water temperature is as follows: 60-65 ℃;
s5: pickling the washed fastener;
s6: carrying out water bath on the pickled fastener by water with the temperature of 80-100 ℃;
s7: flushing the fastener after water bath by using high-temperature steam, wherein the temperature of the high-temperature steam is 200-;
s8: the fastener is completely immersed in a zinc plating solution at the temperature of 35-40 ℃ for electroplating, wherein each liter of the zinc plating solution contains 60-70g of zinc chloride, 280-360g of ammonium chloride, 30-35g of potassium chloride, 30-38g of sodium hydroxide, 55-65g of triethanolamine, 28-30g of boric acid, 15-20ml of organic solvent, 1-2g of softener, 5-8ml of main brightener and 20-25ml of auxiliary brightener which are water; the main brightener is 50-100mg/L of benzalacetone, 250mg/L of sodium benzoate 200-10 mg/L, 5-10mg/L of nicotinic acid and 10-20mg/L of nonylphenol polyoxyethylene ether; the auxiliary brightening agent is imidazole propoxy condensation 40-90 mg/L; the softening agent is a rare earth additive which is lanthanum chloride or cerium chloride; the organic solvent is any one or combination of ethanol, butyl ether and ethylene glycol monomethyl ether; electroplating time is 3-5 minutes, and cathode current density: 2.0-3A/dm 2;
s9: washing with water after electroplating;
s10: immersing the fastener into an activating solution, and immersing at room temperature for 3-5 seconds;
s11: washing with water;
s12: completely immersing the fastener in a galvanizing solution at the temperature of 25-30 ℃ for electroplating for 5-6min, wherein the cathode current is 1.0-2.0A/dm 2;
s13: phosphating the galvanized metal component for 10-20min at 65-75 ℃;
s14: placing the fastener into a passivator with the temperature of 40-45 ℃ and the passivator concentration of 80-150ml/L for 30-50 s;
s15: removing redundant liquid on the surface of the fastener, and then placing the fastener in a dryer for drying at the temperature of 65-75 ℃;
s16: placing the fastener after the galvanization cooling into an oven, heating to 230-260 ℃, and preserving heat for 3-4 hours;
s17: the fastener is immersed in a passivating solution, wherein the dosage of sulfuric acid in the passivating solution is as follows: 10-15 ml/L, the dosage of nitric acid is: 20-30 ml/L, and the consumption of chromic anhydride is as follows: 150-180 g/L, and the dosage of ferrous sulfate is as follows: 5-10 g/L, 2-5g/L potassium dichromate, 10-15g/L hydrofluoric acid and 5-8g/L chromium acetate, wherein the immersion time is 15-18S, and then the mixture is taken out and kept stand for 10-15S in an air hole;
s18: cleaning the passivated fastener by using clear water at the temperature of 45-65 ℃;
s19: drying the fastener after washing by hot air;
s20: carrying out a water wax dipping process on the washed fastener, and baking the dipped metal component at the temperature of 65-70 ℃ for 60-70 min;
s21: and (6) packaging.
On the basis of the above scheme and as a preferable scheme of the scheme: the main brightener is 60-90mg/L of benzalacetone, 240mg/L of sodium benzoate, 6-8mg/L of nicotinic acid and 12-18mg/L of nonylphenol polyoxyethylene ether, and the auxiliary brightener is 45-80mg/L of imidazole propoxy condensation.
On the basis of the above scheme and as a preferable scheme of the scheme: the pH per liter of galvanizing bath is in the range of 6.5.
On the basis of the above scheme and as a preferable scheme of the scheme: the components and the weight percentage of the activating solution comprise 5 to 10 percent of zinc chloride, 15 to 30 percent of ammonium chloride, 0.1 to 2 percent of sodium fluoride, 0.05 to 0.2 percent of fluorine surfactant, 0.1 to 1 percent of stannous oxide, 0.5 to 2 percent of rare earth chloride and the balance of water; the rare earth chloride comprises at least one of lanthanum chloride, cerium chloride, lanthanum cerium chloride and zirconium oxychloride.
On the basis of the above scheme and as a preferable scheme of the scheme: the fastener is immersed into the electrolytic degreasing process, and the electrolytic degreasing process comprises the following steps: 2-5 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 3-6 parts of nonylphenol polyoxyethylene ether, 10-13 parts of silicate, 2-5 parts of lauryl sodium sulfate, 15-18 parts of sodium hydroxide, 3-7 parts of glycerol, 0.2-1 part of disodium ethylene diamine tetraacetate, 0.1-0.5 part of soluble starch, 2-3 parts of sodium metasilicate pentahydrate, 1.5-2.5 parts of sodium gluconate and 65-70 parts of water.
On the basis of the above scheme and as a preferable scheme of the scheme: the electrolytic degreasing mixed solution also comprises 5-15 parts of a surfactant, 0-5 parts of EDTA, 0-5 parts of sodium tetraborate pentahydrate, 3-10 parts of TKPP, 0-6 parts of sodium metasilicate nonahydrate, 4-6 parts of a corrosion inhibitor and 2-3 parts of a defoaming agent.
Compared with the prior art, the invention has the outstanding and beneficial technical effects that: 1. the risk of hydrogen embrittlement of high strength fasteners can be significantly reduced.
2. The uniformity of the zinc coating can be obviously improved, the adhesiveness of the zinc coating is improved, the protective performance of the zinc coating and the fastener is improved, and the weather resistance and the corrosion resistance of the fastener are improved.
3. The occurrence of plating missing defects is further reduced while the uniformity and the adhesiveness of a zinc coating are improved, the local corrosion of the fastener is avoided, and the strength of the fastener is reduced.
Detailed Description
To make the objects, technical solutions and advantages of the present application clearer, the technical solutions will be clearly and completely described below with reference to the embodiments,
in order to obviously reduce the hydrogen embrittlement risk of a high-strength fastener, improve the uniformity of a zinc coating and improve the adhesion of the zinc coating, thereby improving the protective performance of the zinc coating and the fastener, improving the weather resistance and the corrosion resistance of the fastener, further reducing the occurrence of plating missing defects while improving the uniformity and the adhesion of the zinc coating, avoiding the occurrence of local corrosion of the fastener and reducing the strength of the fastener.
Example one
The application discloses a surface treatment process for a high-strength corrosion-resistant fastener, which comprises the following steps:
s1: and (3) firstly carrying out water bath on the machined and formed fastener by water at 80 ℃, carrying out oil removal treatment on the fastener after the water bath, and washing the fastener by clear water after the fastener is taken out.
S2: performing shot blasting treatment on the fastener, wherein the shot blasting material is steel shot, and the shot blasting time is 15min, so that the surface of the fastener is steel gray.
S3, immersing the fastener after shot blasting into the mixture of the following components: 2 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 3 parts of nonylphenol polyoxyethylene ether, 10 parts of silicate, 2 parts of lauryl sodium sulfate, 15 parts of sodium hydroxide, 3 parts of glycerol, 0.2 part of disodium ethylene diamine tetraacetate, 0.1 part of soluble starch, 2 parts of sodium metasilicate pentahydrate, 1.5 parts of sodium gluconate and 65 parts of water, wherein the degreasing temperature is as follows: at 70 ℃, the current density is: 85A/dm2, time 20 min; preferably, the electrolytic degreasing mixed solution further comprises 5 parts of a surfactant, 0 parts of EDTA, 0 part of sodium tetraborate pentahydrate, 3 parts of TKPP, 0 part of sodium metasilicate nonahydrate, 4 parts of a corrosion inhibitor and 2 parts of a defoaming agent.
S4: the fastener after electrolytic degreasing is washed by flowing water, the fastener is fully stirred in the washing process, and the washing water temperature is as follows: at 60 ℃.
S5: and (4) pickling the washed fastener.
S6: the pickled fastener was passed through a water bath at 80 ℃.
S7: and (3) flushing the fastener after water bath by using high-temperature steam, wherein the temperature of the high-temperature steam is 200 ℃, the pressure is 1Mpa, and the flushing time is 15 min.
S8: the method comprises the following steps of completely immersing a fastener in a zinc plating solution at the temperature of 35 ℃ for electroplating, wherein each liter of the zinc plating solution contains 60g of zinc chloride, 280g of ammonium chloride, 30g of potassium chloride, 30g of sodium hydroxide, 55g of triethanolamine, 28g of boric acid, 15ml of organic solvent, 1g of softener, 5ml of main brightener and 20ml of auxiliary brightener, and the auxiliary brightener is water; the main brightening agent is 50mg/L of benzalacetone, 200mg/L of sodium benzoate, 5mg/L of nicotinic acid and 10mg/L of nonylphenol polyoxyethylene ether; the auxiliary brightening agent is imidazole propoxy condensed 40 mg/L; the softening agent is a rare earth additive which is lanthanum chloride or cerium chloride; the organic solvent is any one or combination of ethanol, butyl ether and ethylene glycol monomethyl ether; plating time 3 minutes, cathode current density: 2.0A/dm 2; preferably, the main brightener is benzalacetone 60mg/L, sodium benzoate 210mg/L, nicotinic acid 6mg/L and nonylphenol polyoxyethylene ether 12mg/L, the auxiliary brightener is imidazole propoxy condensation 45mg/L, and the pH value in each liter of galvanizing solution is within 6.5.
S9: and (4) washing after electroplating.
S10: immersing the fastener into an activating solution, and immersing for 3 seconds at room temperature, wherein the activating solution comprises 5% of zinc chloride, 15% of ammonium chloride, 0.1% of sodium fluoride, 0.05% of a fluorine surfactant, 0.1% of stannous oxide, 0.5% of rare earth chloride and the balance of water; the rare earth chloride comprises at least one of lanthanum chloride, cerium chloride, lanthanum cerium chloride and zirconium oxychloride.
S11: and (4) washing with water.
S12: the fastener was again electroplated by completely immersing it in a zinc bath at a temperature of 25 ℃ for 5min with a cathodic current of 1.0A/dm 2.
S13: and (3) carrying out phosphating treatment on the galvanized metal component, wherein the phosphating time is 10-20min, and the phosphating temperature is 65 ℃.
S14: the fastener is placed into a passivating agent with the temperature of 40 ℃, the concentration of the passivating agent is 80ml/L, and the time is 30 s.
S15: excess liquid was removed from the surface of the fasteners and the fasteners were placed in a dryer at a temperature of 65 c to dry.
S16: and (4) placing the fastener after the galvanization cooling into an oven, heating to 230 ℃, and preserving the heat for 3 hours.
S17: the fastener is immersed in a passivating solution, wherein the dosage of sulfuric acid in the passivating solution is as follows: 10ml/L, the dosage of nitric acid is: 20ml/L, the dosage of chromic anhydride is: 150g/L, the dosage of ferrous sulfate is as follows: 5g/L, 2g/L potassium dichromate, 10g/L hydrofluoric acid and 5g/L chromium acetate, wherein the immersion time is 15S, and then the solution is taken out and is kept stand for 10S in an air hole.
S18: and cleaning the passivated fastener by using clear water at 45 ℃.
S19: and drying the fastener after washing by hot air.
S20: and (3) carrying out a water wax dipping process on the washed fastener, and baking the dipped metal component at 65 ℃ for 60 min.
S21: and (6) packaging.
Example two
The application discloses a surface treatment process for a high-strength corrosion-resistant fastener, which comprises the following steps:
s1: and (3) firstly carrying out water bath on the machined and formed fastener by water at 90 ℃, carrying out oil removal treatment on the fastener after the water bath, and washing the fastener by clear water after the fastener is taken out.
S2: performing shot blasting treatment on the fastener, wherein the shot blasting material is steel shot, and the shot blasting time is 20min, so that the surface of the fastener is steel gray.
S3, immersing the fastener after shot blasting into the mixture of the following components: 3 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 4 parts of nonylphenol polyoxyethylene ether, 12 parts of silicate, 3 parts of lauryl sodium sulfate, 16.5 parts of sodium hydroxide, 5 parts of glycerol, 0.6 part of disodium ethylene diamine tetraacetate, 0.3 part of soluble starch, 2.5 parts of sodium metasilicate pentahydrate, 2 parts of sodium gluconate and 68 parts of water, wherein the degreasing temperature is as follows: at 75 ℃, the current density is: 87.5A/dm2 for 22.5 min; preferably, the electrolytic degreasing mixed solution also comprises 10 parts of surfactant, 2.5 parts of EDTA, 2.5 parts of sodium tetraborate pentahydrate, 6.5 parts of TKPP, 3 parts of sodium metasilicate nonahydrate, 5 parts of corrosion inhibitor and 2.5 parts of defoaming agent.
S4: the fastener after electrolytic degreasing is washed by flowing water, the fastener is fully stirred in the washing process, and the washing water temperature is as follows: 62.5 ℃.
S5: and (4) pickling the washed fastener.
S6: the pickled fastener was passed through a water bath at 90 ℃.
S7: and (3) flushing the fastener after water bath by using high-temperature steam, wherein the temperature of the high-temperature steam is 220 ℃, the pressure is 1.5Mpa, and the flushing time is 17.5 min.
S8: the fastener is completely immersed in a galvanizing solution at the temperature of 37.5 ℃ for electroplating, wherein each liter of the galvanizing solution contains 65g of zinc chloride, 320g of ammonium chloride, 32.5g of potassium chloride, 34g of sodium hydroxide, 60g of triethanolamine, 29g of boric acid, 17.5ml of organic solvent, 1.5g of softener, 7ml of primary brightener and 22.5ml of auxiliary brightener, and the solution is water; the main brightening agent is 75mg/L of benzalacetone, 225mg/L of sodium benzoate, 7.5mg/L of nicotinic acid and 15mg/L of nonylphenol polyoxyethylene ether; the auxiliary brightening agent is imidazole propoxy condensation 65 mg/L; the softening agent is a rare earth additive which is lanthanum chloride or cerium chloride; the organic solvent is any one or combination of ethanol, butyl ether and ethylene glycol monomethyl ether; plating time 4 minutes, cathode current density: 2.5A/dm 2; preferably, the main brightener is benzalacetone 75mg/L, sodium benzoate 230mg/L, nicotinic acid 7mg/L and nonylphenol polyoxyethylene ether 15mg/L, the auxiliary brightener is imidazole propoxy condensation 60mg/L, and the pH value in each liter of galvanizing solution is within 6.5.
S9: and (4) washing after electroplating.
S10: immersing the fastener into an activating solution, and immersing for 4 seconds at room temperature, wherein the activating solution comprises 7.5% of zinc chloride, 22.5% of ammonium chloride, 1.05% of sodium fluoride, 0.0125% of a fluorine surfactant, 0.55% of stannous oxide, 1.25% of rare earth chloride and the balance of water; the rare earth chloride comprises at least one of lanthanum chloride, cerium chloride, lanthanum cerium chloride and zirconium oxychloride.
S11: and (4) washing with water.
S12: the fasteners were again electroplated by completely immersing them in a galvanizing bath at a temperature of 27.5 ℃ for 5.5min with a cathodic current of 4.5A/dm 2.
S13: and (3) carrying out phosphating treatment on the galvanized metal component for 15min at the phosphating temperature of 70 ℃.
S14: the fastener was placed in a passivating agent at a temperature of 42.5 ℃ at a passivating agent concentration of 115ml/L for a period of 40 s.
S15: excess liquid on the surface of the fastener was removed and the fastener was placed in a dryer at a temperature of 70 c to dry.
S16: and (4) placing the fastener after the galvanization cooling into an oven, heating to 245 ℃, and preserving the heat for 3.5 hours.
S17: the fastener is immersed in a passivating solution, wherein the dosage of sulfuric acid in the passivating solution is as follows: 12.5ml/L, the dosage of nitric acid is: 25ml/L, the dosage of chromic anhydride is: 165g/L, the dosage of ferrous sulfate is: 7.5g/L, 3g/L potassium dichromate, 12.5g/L hydrofluoric acid and 6.5g/L chromium acetate, wherein the immersion time is 16.5S, and then the solution is taken out and is kept stand for 12.5S in an air hole.
S18: and cleaning the passivated fastener by using clear water at 50 ℃.
S19: and drying the fastener after washing by hot air.
S20: and (3) carrying out a water wax dipping process on the washed fastener, and baking the dipped metal component at the baking temperature of 67.5 ℃ for 65 min.
S21: and (6) packaging.
EXAMPLE III
The application discloses a surface treatment process for a high-strength corrosion-resistant fastener, which comprises the following steps:
s1: and (3) firstly carrying out water bath on the machined and formed fastener by water at 100 ℃, carrying out oil removal treatment on the fastener after the water bath, and washing the fastener by clear water after the fastener is taken out.
S2: performing shot blasting treatment on the fastener, wherein the shot blasting material is steel shot, and the shot blasting time is 25min, so that the surface of the fastener is steel gray.
S3, immersing the fastener after shot blasting into the mixture of the following components: 5 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 6 parts of nonylphenol polyoxyethylene ether, 13 parts of silicate, 5 parts of lauryl sodium sulfate, 18 parts of sodium hydroxide, 7 parts of glycerol, 1 part of disodium ethylene diamine tetraacetate, 0.5 part of soluble starch, 3 parts of sodium metasilicate pentahydrate, 2.5 parts of sodium gluconate and 70 parts of water, wherein the degreasing temperature is as follows: at 80 ℃, the current density is: 90A/dm2 for 25 min; preferably, the electrolytic degreasing mixed solution further comprises 15 parts of a surfactant, 5 parts of EDTA, 5 parts of sodium tetraborate pentahydrate, 10 parts of TKPP, 6 parts of sodium metasilicate nonahydrate, 6 parts of a corrosion inhibitor and 3 parts of a defoaming agent.
S4: the fastener after electrolytic degreasing is washed by flowing water, the fastener is fully stirred in the washing process, and the washing water temperature is as follows: and 65 ℃.
S5: and (4) pickling the washed fastener.
S6: the pickled fastener was passed through a water bath at 100 ℃.
S7: and (3) flushing the fastener after water bath by using high-temperature steam, wherein the temperature of the high-temperature steam is 230 ℃, the pressure is 3Mpa, and the flushing time is 20 min.
S8: the fastener is completely immersed in a galvanizing solution at the temperature of 40 ℃ for electroplating, wherein each liter of the solution in the galvanizing solution contains 70g of zinc chloride, 360g of ammonium chloride, 30-35g of potassium chloride, 30-38g of sodium hydroxide, 55-65g of triethanolamine, 28-30g of boric acid, 15-20ml of organic solvent, 1-2g of softening agent, 5-8ml of main brightening agent and 20-25ml of auxiliary brightening agent, which are water; the main brightener is 50-100mg/L of benzalacetone, 250mg/L of sodium benzoate 200-10 mg/L, 5-10mg/L of nicotinic acid and 10-20mg/L of nonylphenol polyoxyethylene ether; the auxiliary brightening agent is imidazole propoxy condensation 40-90 mg/L; the softening agent is a rare earth additive which is lanthanum chloride or cerium chloride; the organic solvent is any one or combination of ethanol, butyl ether and ethylene glycol monomethyl ether; electroplating time is 3-5 minutes, and cathode current density: 2.0-3A/dm 2; preferably, the main brightener is 60-90mg/L of benzalacetone, 240mg/L of sodium benzoate, 6-8mg/L of nicotinic acid and 12-18mg/L of nonylphenol polyoxyethylene ether, the auxiliary brightener is 45-80mg/L of propoxy condensation of imidazole, and the pH value in each liter of zinc plating solution is within 6.5.
S9: and (4) washing after electroplating.
S10: immersing the fastener into an activating solution, and immersing for 3-5 seconds at room temperature, wherein the activating solution comprises 5-10% of zinc chloride, 15-30% of ammonium chloride, 0.1-2% of sodium fluoride, 0.05-0.2% of a fluorine surfactant, 0.1-1% of stannous oxide, 0.5-2% of rare earth chloride and the balance of water; the rare earth chloride comprises at least one of lanthanum chloride, cerium chloride, lanthanum cerium chloride and zirconium oxychloride.
S11: and (4) washing with water.
S12: and completely immersing the fastener in a galvanizing solution with the temperature of 25-30 ℃ for electroplating for 5-6min, wherein the cathode current is 1.0-2.0A/dm 2.
S13: and (2) carrying out phosphating treatment on the galvanized metal component, wherein the phosphating time is 10-20min, and the phosphating temperature is 65-75 ℃.
S14: the fastener is put into a passivator with the temperature of 40-45 ℃, the concentration of the passivator is 80-150ml/L, and the time is 30-50 s.
S15: removing excessive liquid on the surface of the fastener, and drying the fastener in a dryer at 65-75 ℃.
S16: and (4) placing the fastener after the galvanization cooling into an oven, heating to 230-260 ℃, and preserving the heat for 3-4 hours.
S17: the fastener is immersed in a passivating solution, wherein the dosage of sulfuric acid in the passivating solution is as follows: 10-15 ml/L, the dosage of nitric acid is: 20-30 ml/L, and the consumption of chromic anhydride is as follows: 150-180 g/L, and the dosage of ferrous sulfate is as follows: 5-10 g/L, 2-5g/L potassium dichromate, 10-15g/L hydrofluoric acid and 5-8g/L chromium acetate, wherein the immersion time is 15-18S, and then the mixture is taken out and kept stand for 10-15S in an air hole.
S18: and cleaning the passivated fastener by using clear water at the temperature of 45-65 ℃.
S19: and drying the fastener after washing by hot air.
S20: and (3) performing a water wax dipping process on the washed fastener, and baking the dipped metal component at the temperature of 65-70 ℃ for 60-70 min.
S21: and (6) packaging.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (6)
1. A surface treatment process for a high-strength corrosion-resistant fastener is characterized by comprising the following steps: the method comprises the following steps:
s1: firstly, carrying out water bath on the machined and formed fastener by water at the temperature of 80-100 ℃, then carrying out oil removal treatment on the fastener, taking out the fastener and washing the fastener by clean water;
s2: performing shot blasting treatment on the fastener, wherein the shot blasting material is steel shot, and the shot blasting time is 15-25min, so that the surface of the fastener is steel gray;
s3, performing electrolytic degreasing on the fastener after shot blasting, wherein the degreasing temperature is as follows: at 70-80 ℃, the current density is: 85A/dm 2-90A/dm 2 for 20-25 min;
s4: the fastener after electrolytic degreasing is washed by flowing water, the fastener is fully stirred in the washing process, and the washing water temperature is as follows: 60-65 ℃;
s5: pickling the washed fastener;
s6: carrying out water bath on the pickled fastener by water with the temperature of 80-100 ℃;
s7: flushing the fastener after water bath by using high-temperature steam, wherein the temperature of the high-temperature steam is 200-;
s8: the fastener is completely immersed in a zinc plating solution at the temperature of 35-40 ℃ for electroplating, wherein each liter of the zinc plating solution contains 60-70g of zinc chloride, 280-360g of ammonium chloride, 30-35g of potassium chloride, 30-38g of sodium hydroxide, 55-65g of triethanolamine, 28-30g of boric acid, 15-20ml of organic solvent, 1-2g of softener, 5-8ml of main brightener and 20-25ml of auxiliary brightener which are water; the main brightener is 50-100mg/L of benzalacetone, 250mg/L of sodium benzoate 200-10 mg/L, 5-10mg/L of nicotinic acid and 10-20mg/L of nonylphenol polyoxyethylene ether; the auxiliary brightening agent is imidazole propoxy condensation 40-90 mg/L; the softening agent is a rare earth additive which is lanthanum chloride or cerium chloride; the organic solvent is any one or combination of ethanol, butyl ether and ethylene glycol monomethyl ether; electroplating time is 3-5 minutes, and cathode current density: 2.0-3A/dm 2;
s9: washing with water after electroplating;
s10: immersing the fastener into an activating solution, and immersing at room temperature for 3-5 seconds;
s11: washing with water;
s12: completely immersing the fastener in a galvanizing solution at the temperature of 25-30 ℃ for electroplating for 5-6min, wherein the cathode current is 1.0-2.0A/dm 2;
s13: phosphating the galvanized metal component for 10-20min at 65-75 ℃;
s14: placing the fastener into a passivator with the temperature of 40-45 ℃ and the passivator concentration of 80-150ml/L for 30-50 s;
s15: removing redundant liquid on the surface of the fastener, and then placing the fastener in a dryer for drying at the temperature of 65-75 ℃;
s16: placing the fastener after the galvanization cooling into an oven, heating to 230-260 ℃, and preserving heat for 3-4 hours;
s17: the fastener is immersed in a passivating solution, wherein the dosage of sulfuric acid in the passivating solution is as follows: 10-15 ml/L, the dosage of nitric acid is: 20-30 ml/L, and the consumption of chromic anhydride is as follows: 150-180 g/L, and the dosage of ferrous sulfate is as follows: 5-10 g/L, 2-5g/L potassium dichromate, 10-15g/L hydrofluoric acid and 5-8g/L chromium acetate, wherein the immersion time is 15-18S, and then the mixture is taken out and kept stand for 10-15S in an air hole;
s18: cleaning the passivated fastener by using clear water at the temperature of 45-65 ℃;
s19: drying the fastener after washing by hot air;
s20: carrying out a water wax dipping process on the washed fastener, and baking the dipped metal component at the temperature of 65-70 ℃ for 60-70 min;
s21: and (6) packaging.
2. The surface treatment process of a high-strength corrosion-resistant fastener according to claim 1, wherein: the main brightener is 60-90mg/L of benzalacetone, 240mg/L of sodium benzoate, 6-8mg/L of nicotinic acid and 12-18mg/L of nonylphenol polyoxyethylene ether, and the auxiliary brightener is 45-80mg/L of imidazole propoxy condensation.
3. The surface treatment process of a high-strength corrosion-resistant fastener according to claim 1, wherein: the pH per liter of galvanizing bath is in the range of 6.5.
4. The surface treatment process of a high-strength corrosion-resistant fastener according to claim 1, wherein: the components and the weight percentage of the activating solution comprise 5 to 10 percent of zinc chloride, 15 to 30 percent of ammonium chloride, 0.1 to 2 percent of sodium fluoride, 0.05 to 0.2 percent of fluorine surfactant, 0.1 to 1 percent of stannous oxide, 0.5 to 2 percent of rare earth chloride and the balance of water; the rare earth chloride comprises at least one of lanthanum chloride, cerium chloride, lanthanum cerium chloride and zirconium oxychloride.
5. The surface treatment process of a high-strength corrosion-resistant fastener according to claim 1, wherein: the fastener is immersed into the electrolytic degreasing process, and the electrolytic degreasing process comprises the following steps: 2-5 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 3-6 parts of nonylphenol polyoxyethylene ether, 10-13 parts of silicate, 2-5 parts of lauryl sodium sulfate, 15-18 parts of sodium hydroxide, 3-7 parts of glycerol, 0.2-1 part of disodium ethylene diamine tetraacetate, 0.1-0.5 part of soluble starch, 2-3 parts of sodium metasilicate pentahydrate, 1.5-2.5 parts of sodium gluconate and 65-70 parts of water.
6. The surface treatment process of a high-strength corrosion-resistant fastener according to claim 1, wherein: the electrolytic degreasing mixed solution also comprises 5-15 parts of a surfactant, 0-5 parts of EDTA, 0-5 parts of sodium tetraborate pentahydrate, 3-10 parts of TKPP, 0-6 parts of sodium metasilicate nonahydrate, 4-6 parts of a corrosion inhibitor and 2-3 parts of a defoaming agent.
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Application publication date: 20200417 |