CN108914192B - Stainless steel matte treatment process - Google Patents
Stainless steel matte treatment process Download PDFInfo
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- CN108914192B CN108914192B CN201810830906.4A CN201810830906A CN108914192B CN 108914192 B CN108914192 B CN 108914192B CN 201810830906 A CN201810830906 A CN 201810830906A CN 108914192 B CN108914192 B CN 108914192B
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 106
- 239000010935 stainless steel Substances 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 35
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- 238000007254 oxidation reaction Methods 0.000 claims abstract description 29
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- 238000010438 heat treatment Methods 0.000 claims abstract description 6
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- 238000007743 anodising Methods 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 5
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- 239000012670 alkaline solution Substances 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 18
- 238000002791 soaking Methods 0.000 claims description 18
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- 239000008367 deionised water Substances 0.000 claims description 12
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- 238000009210 therapy by ultrasound Methods 0.000 claims description 6
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- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 4
- 229910000406 trisodium phosphate Inorganic materials 0.000 claims description 3
- 238000007730 finishing process Methods 0.000 claims 1
- 238000007602 hot air drying Methods 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 10
- 239000002932 luster Substances 0.000 abstract description 6
- 238000004381 surface treatment Methods 0.000 abstract description 2
- 239000010963 304 stainless steel Substances 0.000 description 32
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 32
- 229910052751 metal Inorganic materials 0.000 description 21
- 239000002184 metal Substances 0.000 description 21
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 15
- -1 salt potassium sulfate Chemical class 0.000 description 15
- 239000002253 acid Substances 0.000 description 12
- 229910019142 PO4 Inorganic materials 0.000 description 9
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- 239000003440 toxic substance Substances 0.000 description 5
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- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 229910001430 chromium ion Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 239000010407 anodic oxide Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010297 mechanical methods and process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910020489 SiO3 Inorganic materials 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 238000002048 anodisation reaction Methods 0.000 description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
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- 238000002310 reflectometry Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
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- 238000005868 electrolysis reaction Methods 0.000 description 1
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- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 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 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002696 manganese Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001463 metal phosphate Inorganic materials 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000008055 phosphate buffer solution Substances 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
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- 239000012266 salt solution Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
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- 230000002195 synergetic effect Effects 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/34—Anodisation of metals or alloys not provided for in groups C25D11/04 - C25D11/32
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention belongs to the technical field of surface treatment of medical equipment, and relates to a stainless steel matte treatment process, which mainly adopts the technical scheme that: connecting the stainless steel workpiece after oil removal with the positive electrode of a power supply, and placing the stainless steel workpiece after oil removal in a container containing 10-50 g/LH3PO4、10～30g/LC6H8O7、100～300g/LH2O2And 0.4-1g/LK2SO4Heating the solution to 60-80 ℃ in the anodic matte oxidation treatment solution of the mixture, simultaneously connecting a platinum-titanium net with an area ratio of 1:1 with a direct current power supply cathode, keeping the distance between the two electrodes at 6.0cm, and keeping the current density at 3.4-6.8A/dm2And anodizing for 30-60 min under the condition that the working voltage is 9.4-10.5V, so that the surface of the stainless steel workpiece is matt and has silvery white metallic luster, the hardness of the stainless steel is improved, and the pitting corrosion resistance is improved.
Description
Technical Field
The invention belongs to the technical field of surface treatment of medical equipment, and relates to a stainless steel matte treatment process.
Background
Because austenitic stainless steel has the advantages of strong corrosion resistance and low cost, the stainless steel is widely applied to the medical equipment industry. Stainless steel equipment is required to be processed to matt in the industry to avoid light pollution caused by indoor light reflection. At present, the stainless steel is processed into a product with a matte surface and uniform silvery white metallic luster by adopting a matte treatment technology. Most enterprises choose mechanical methods (such as wire drawing, sand blasting, rolling, etc.) and chemical milling techniques to process stainless steel.
The invention patent with the application number of CN201710991265.6 discloses a method for producing low-reflectivity surface stainless steel, which produces the low-reflectivity surface stainless steel by a twenty-high rolling mill rolling mode, but the stainless steel produced by the mechanical method has the problems of uneven matte or dark metal luster.
The invention patent with the application number of CN02138212.3 discloses a stainless steel surface electrochemical oxidation treatment method, which is to place degreased stainless steel material in the electrochemical oxygen of sulfuric acid, chromic acid, molybdate, manganese salt and waterChanging the current density of the mixed solution to 10-100 mA/dm through the alternate change of positive and negative currents2And under the condition of the temperature of 30-60 ℃, a thin layer of spinel oxide is formed after treatment for 5-20 minutes, and the obtained stainless steel has the characteristics of good corrosion resistance, no color change on the surface of the material, low cost, less pollution, simple process, easiness in control and the like.
The invention patent with the application number of CN201110178327.4 discloses a stainless steel surface nano-pore array film and a preparation method thereof, wherein stainless steel with a pretreated surface is used as an anode and is placed in a phosphate buffer solution for electrochemical anodic oxidation treatment, the time of the electrochemical anodic oxidation treatment is 0.1-4 h, and the nano-pore array film is obtained on the treated stainless steel surface; the voltage of the electrochemical anode oxidation is 10-80V, the temperature of the electrochemical anode oxidation is-5-40 ℃, the voltage of the electrochemical anode oxidation is high, the time of the anode oxidation treatment is long, and the applicability is poor.
The invention patent with the application number of CN200810031520.3 discloses a stainless steel surface modification method, which is characterized in that after a stainless steel product is pretreated by a conventional method, the stainless steel product is used as an anode to be subjected to anode polarization treatment, and in the treatment process, citrate and nitrate additives are added into an electrolyte solution of citric acid and boric acid, the current density and the polarization time are controlled, and the stainless steel surface is treated. The stainless steel obtained by the stainless steel surface modification method has improved corrosion resistance, but does not have a matte effect.
Compared with mechanical method, the chemical method can ensure metal matt and has certain metal luster and corrosion resistance. However, according to the chemical method, strong acids such as hydrochloric acid, nitric acid, hydrofluoric acid and sulfuric acid and toxic substances (such as hydrofluoric acid) are often selected as acid etching agents to treat stainless steel, and the strong acids and the toxic substances can bring harm to the environment and operators, and no environment-friendly matte treatment liquid is reported at present. Article [ wangya, zhao, chemical brightening treatment after low-temperature carburizing and hardening treatment of austenitic stainless steel, surface technique, 2016, 45 (1): 106-110, the surface hardness of the stainless steel is reduced after the treatment by the conventional chemical method, and the surface of the stainless steel has no matte effect. In order to improve the corrosion resistance of stainless steel, the stainless steel is treated by citric acid type passivation solution, so that the pitting corrosion resistance of 316L stainless steel and 304 stainless steel can be improved, but the reaction speed is low, and the matt effect is not achieved.
It can be seen from the present research that to solve the problem of containing strong acid and toxic substances in the matte treatment solution, an environment-friendly matte treatment solution containing neutral or weak acid is selected to replace the above-mentioned solution, but the problem of low dissolution rate of stainless steel in the environment-friendly matte treatment solution containing neutral or weak acid (such as citric acid) needs to be solved.
Disclosure of Invention
In view of the above, the present invention provides a stainless steel matte treatment process, which is used for treating stainless steel, and can solve the problem of low dissolution rate of stainless steel due to the fact that an environment-friendly matte treatment solution containing neutral or weak acid is selected to replace a strong acid etchant to treat stainless steel in the prior art.
In order to achieve the purpose, the invention provides a stainless steel matte treatment process, which comprises the following process steps:
(I) pretreatment:
A. soaking the stainless steel workpiece in an alkaline solution at 70 +/-5 ℃ for 5-10 min to remove oil stains on the surface of the stainless steel workpiece;
B. placing the stainless steel workpiece subjected to oil removal and decontamination in ultrasonic deionized water for ultrasonic rinsing for 5-10 min, so that dirt on the surface of the stainless steel workpiece is thoroughly cleaned;
C. placing the stainless steel workpiece subjected to ultrasonic treatment in absolute ethyl alcohol, soaking for 10-30 s, and drying;
(II) sub-photo anodic oxidation treatment:
D. connecting the pretreated stainless steel workpiece with the positive electrode of a power supply, and placing the stainless steel workpiece containing 10-50 g/LH3PO4、10～30g/LC6H8O7、100～300g/LH2O2And 0.4-1g/L K2SO4Heating the solution to 60-80 ℃ in the anodic matte oxidation treatment solution of the mixture, simultaneously connecting a platinum-titanium net with an area ratio of 1:1 with a direct current power supply cathode, keeping the distance between the two electrodes at 6.0cm, and keeping the current density at 3.4-6.8A/dm2And anodizing for 30-60 min under the condition that the working voltage is 9.4-10.5V, so that the surface of the stainless steel workpiece is matt.
(III) post-treatment:
E. and (3) post-treatment: and (3) placing the stainless steel workpiece subjected to the matte treatment in deionized water for washing for 2 times, soaking the stainless steel workpiece in absolute ethyl alcohol for 10-30 seconds, and drying.
Further, the alkaline solution in the step A is 64g/L NaOH and 20g/LNa2CO3、10g/L Na2SiO3And 50g/LNa3PO4One or more of the above-mentioned (B) and (C), wherein the pH value of the alkaline solution is 8-9.
And further, drying in the steps C and E is carried out by adopting an oven, hot air is dried in a purified environment, and a high-temperature-resistant high-efficiency filter is additionally arranged at an air inlet and an air outlet of an air duct of the oven.
The invention has the beneficial effects that:
1. the invention discloses a stainless steel matte treatment process, which selects an environment-friendly matte treatment solution of neutral acid phosphoric acid, weak acid citric acid, hydrogen peroxide and neutral salt potassium sulfate which do not contain toxic substances and strong acid substances as an etching agent of a stainless steel workpiece, wherein phosphoric acid and citric acid in the environment-friendly matte treatment solution provide hydrogen ions for etching an oxide film on a metal surface, the synergistic action of phosphate radicals and citrate radicals and iron ions and chromium ions generated by oxidation of a metal substrate are complexed to form a complex, the quantity of metal ions on a metal/solution interface is consumed, and the etching speed of the metal surface is accelerated. When metal ions at a metal/solution interface reach a certain concentration, the metal ions and phosphate radicals form colloidal particles to cover the metal surface to form a compact protective film; the colloid particle covering on the protruding part of the metal surface is thin, so that the loop resistance is small, and the dissolution speed of the protruding part is high; on the contrary, the loop resistance is large after the colloid particles cover the sunken part of the metal surface, the dissolution speed of the part is slow, and the phosphate radical has the leveling effect. The metal surface roughness is adjusted through the cooperation of phosphate radicals and citrate radicals, so that the metal surface is flat and matt, has a certain metal glossiness, and is good in corrosion effect. In addition, the complexing ability of citrate and phosphate to iron ions is stronger than that of chromium ions, so that the metal surface is rich in chromium, and the hardness of the metal surface is increased after the oxidation by hydrogen peroxide; since the interface oxide contains less iron oxide, pitting corrosion resistance is improved.
2. The reason that the anodic oxidation and the etching agent can accelerate the stainless steel matte treatment in the stainless steel matte treatment process disclosed by the invention is as follows: (1) the anodic oxidation stainless steel is connected with the positive electrode of a power supply, the platinum titanium mesh is connected with the negative electrode of the power supply, the stainless steel generates anodic polarization, the anodic oxidation reaction process of metal is accelerated, a large amount of metal iron ions and chromium ions enter a metal/solution interface, the roughness of the metal surface is increased, the dissolving speed is accelerated, the matte treatment time of the stainless steel is reduced, and matte is formed on the surface of the stainless steel in a short time. (2) Adding phosphate radical, citrate radical, phosphate radical and citrate radical to complex with iron ion and chromium ion to form complex compound for speeding the etching of metal surface. (3) Adding conductive salt K into conductive salt solution2SO4The solution resistance can be reduced, the migration speed of metal ions in an electric field is accelerated, the voltage of a groove between two electrodes is reduced, and the energy consumption is reduced.
3. According to the stainless steel matte treatment process disclosed by the invention, the matte treatment speed of a stainless steel workpiece is accelerated by adopting an anodic oxidation process, the dissolving speed of an environment-friendly matte treatment solution is greatly improved under the condition of externally adding an anodic current, the matte treatment time of the stainless steel workpiece can be reduced to 30-60 min, the voltage required by anodic oxidation is extremely low, the electrolysis time is extremely short, the energy consumption required by anodic oxidation is extremely low, no environmental pollution is caused, and the process is suitable for batch production. The technology can solve the environmental protection problem that the prior stainless steel matte treatment solution contains toxic substances and strong acid, can also solve the problem of low dissolution speed of the environmental protection solution, simultaneously has higher matte degree, hardness and pitting corrosion resistance than the prior art after anodic oxidation treatment, and provides a new way for the development of stainless steel matte treatment.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
FIG. 1 is a graph of the morphology of sub-photochemically treated 304 stainless steel of comparative example 1;
FIG. 2 is a graph of the morphology of the 304 stainless steel treated by the sub-photoanode oxidation in example 1;
FIG. 3 is a plot of pitting topography for sub-photochemically treated 304 stainless steel in comparative example 1;
FIG. 4 is a graph of the pitting topography of the 304 stainless steel treated by the sub-photo anodic oxidation in example 1.
Detailed Description
The preferred embodiments of the present invention will be described in detail below.
Example 1
A304 stainless steel matte treatment process comprises the following process steps:
(I) pretreatment:
A. soaking the 304 stainless steel workpiece in 70 deg.C alkaline solution for 5min to remove oil stain on the surface of the 304 stainless steel workpiece, wherein the alkaline solution is 64g/L NaOH and 20g/LNa2CO3、10g/L Na2SiO3And 50g/L Na3PO4The pH value of the alkaline solution is 9;
B. placing the degreased and decontaminated 304 stainless steel workpiece in ultrasonic deionized water for ultrasonic rinsing for 10min to thoroughly clean up the dirt on the surface of the 304 stainless steel workpiece;
C. soaking the 304 stainless steel workpiece subjected to ultrasonic treatment in absolute ethyl alcohol for 10s, and drying;
(II) sub-photo anodic oxidation treatment:
D. connecting the pretreated 304 stainless steel workpiece with the positive electrode of a power supply, and placing the workpiece with the content of 28g/LH3PO4、20g/LC6H8O7、200g/LH2O2And 0.4-1g/L K2SO4Anodic oxidation of the mixtureHeating the solution to 70 deg.C in the matte treatment solution, connecting platinum-titanium net with area ratio of 1:1 with DC power supply cathode, maintaining the distance between two electrodes at 6.0cm, and controlling current density at 3.4A/dm2And anodizing for 60min under the condition that the working voltage is 9.4V, so that the surface of the 304 stainless steel workpiece is matte.
(III) post-treatment:
E. and (3) post-treatment: and (3) placing the 304 stainless steel workpiece subjected to the matte treatment in deionized water for washing for 2 times, soaking the 304 stainless steel workpiece in absolute ethyl alcohol for 10s, and then drying, wherein the drying process in the steps C and E is carried out by adopting an oven, hot air is dried in a purified environment, and a high-temperature-resistant high-efficiency filter is additionally arranged at an air inlet and an air outlet of an air duct of the oven.
Comparative example 1
A304 stainless steel matte treatment process comprises the following process steps:
(I) pretreatment:
A. soaking the 304 stainless steel workpiece in 70 deg.C alkaline solution for 5min to remove oil stain on the surface of the 304 stainless steel workpiece, wherein the alkaline solution is 64g/LNaOH and 20g/LNa2CO3、10g/LNa2SiO3And 50g/LNa3PO4The pH value of the alkaline solution is 9;
B. placing the degreased and decontaminated 304 stainless steel workpiece in ultrasonic deionized water for ultrasonic rinsing for 10min to thoroughly clean up the dirt on the surface of the 304 stainless steel workpiece;
C. soaking the 304 stainless steel workpiece subjected to ultrasonic treatment in absolute ethyl alcohol for 10s, and drying;
(II) performing sub-photochemical treatment:
D. putting the pretreated 304 stainless steel workpiece into a container containing 28g/LH3PO4、20g/LC6H8O7And 200g/LH2O2Heating the solution in the mixture light treatment solution to 70 ℃ and preserving the temperature for 60min to obtain a layer of anodic oxide film on the surface of the 304 stainless steel workpiece;
(III) post-treatment:
E. and (3) post-treatment: and (3) placing the 304 stainless steel workpiece subjected to the matte treatment in deionized water for washing for 2 times, soaking the 304 stainless steel workpiece in absolute ethyl alcohol for 10s, and then drying, wherein the drying process in the steps C and E is carried out by adopting an oven, hot air is dried in a purified environment, and a high-temperature-resistant high-efficiency filter is additionally arranged at an air inlet and an air outlet of an air duct of the oven.
Calculating the sub-luminosity of a 304 stainless steel workpiece sample according to the formula 1, wherein gamma refers to the sub-luminosity; epsilon0The glossiness of the unanode oxidized stainless steel is shown; ε refers to the gloss of the anodized stainless steel.
FIG. 1 is a topographic map of 304 stainless steel which is not anodized in comparative example 1, FIG. 2 is a topographic map of 304 stainless steel which is subjected to a sub-photo anodization in example 1, FIG. 3 is a pitting topographic map of 304 stainless steel which is not anodized in comparative example 1, and FIG. 4 is a pitting topographic map of 304 stainless steel which is subjected to a sub-photo anodization in example 1. Detection shows that the matt degree of the 304 stainless steel after the matte anodic oxidation treatment is obviously improved (see table 1) compared with a chemical method, and the stainless steel keeps silvery white metallic luster; hardness (HV)0.2) The increase is 1.1 times of that of the untreated stainless steel; according to GB/T17899-1999 standard, the pitting potential of 304 stainless steel is obviously shifted up to about 380mV, and the pitting degree is obviously reduced.
TABLE 1.304 stainless steel Performance after different matte processing
Example 2
A316L stainless steel matte treatment process comprises the following process steps:
(I) pretreatment:
A. soaking the 316L stainless steel workpiece in 70 ℃ alkaline solution for 5min to remove oil stains on the surface of the 316L stainless steel workpiece, wherein the alkaline solution is 64g/LNaOH and 20g/LNa2CO3、10g/LNa2SiO3And 50g/LNa3PO4The pH value of the alkaline solution is 8;
B. placing the degreased and decontaminated 316L stainless steel workpiece in ultrasonic deionized water for ultrasonic rinsing for 10min to thoroughly clean up the dirt on the surface of the 316L stainless steel workpiece;
C. soaking the 316L stainless steel workpiece subjected to ultrasonic treatment in absolute ethyl alcohol for 10s, and drying;
(II) sub-photo anodic oxidation treatment:
D. connecting the pretreated 316L stainless steel workpiece with the positive electrode of a power supply, and placing the workpiece with the power supply at a position containing 28g/LH3PO4、20g/LC6H8O7And 200g/LH2O2And 0.4-1g/L K2SO4Heating the solution to 70 deg.C while connecting a platinum-titanium net with an area ratio of 1:1 with the negative electrode of a DC power supply, and maintaining the distance between the two electrodes at 6.0cm and the current density at 3.5A/dm2Anodizing for 60min under the condition that the working voltage is 10.5V, so that an anodic oxide film is obtained on the surface of the 316L stainless steel workpiece;
(III) post-treatment:
E. and (3) post-treatment: and (3) placing the 316L stainless steel workpiece subjected to the matte treatment in deionized water for washing for 2 times, soaking the 316L stainless steel workpiece in absolute ethyl alcohol for 10s, and then drying, wherein the drying process in the steps C and E is carried out by adopting an oven, hot air is dried in a purified environment, and a high-temperature-resistant high-efficiency filter is additionally arranged at an air inlet and an air outlet of an air duct of the oven.
Comparative example 2
A316L stainless steel matte treatment process comprises the following process steps:
(I) pretreatment:
A. soaking the 316L stainless steel workpiece in an alkaline solution at 70 ℃ for 5min to remove oil stains on the surface of the 316L stainless steel workpiece, wherein the alkaline solution is 64g/L NaOH and 20g/LNa2CO3、10g/L Na2SiO3And 50g/L Na3PO4The pH value of the alkaline solution is 8;
B. placing the degreased and decontaminated 316L stainless steel workpiece in ultrasonic deionized water for ultrasonic rinsing for 10min to thoroughly clean up the dirt on the surface of the 316L stainless steel workpiece;
C. soaking the 316L stainless steel workpiece subjected to ultrasonic treatment in absolute ethyl alcohol for 10s, and drying;
(II) performing sub-photochemical treatment:
D. putting the pretreated 304 stainless steel workpiece into a container containing 28g/LH3PO4、20g/LC6H8O7And 200g/LH2O2Heating the solution in the mixture light treatment solution to 70 ℃ and preserving the temperature for 60min to obtain a layer of anodic oxide film on the surface of a 316L stainless steel workpiece;
(III) post-treatment:
E. and (3) post-treatment: and (3) placing the 316L stainless steel workpiece subjected to the matte treatment in deionized water for washing for 2 times, soaking the 316L stainless steel workpiece in absolute ethyl alcohol for 10s, and then drying, wherein the drying process in the steps C and E is carried out by adopting an oven, hot air is dried in a purified environment, and a high-temperature-resistant high-efficiency filter is additionally arranged at an air inlet and an air outlet of an air duct of the oven.
The sub-luminosity of the 316L stainless steel workpiece sample was calculated according to equation 1 (see table 2). The detection shows that the matt degree of the 316L stainless steel after the matte anodic oxidation treatment is 17.1 percent compared with the chemical method, and the 316L stainless steel keeps silvery white metallic luster; hardness (HV) after matte anodic oxidation treatment0.2) 1.03 times of chemically treated stainless steel; after the sub-optical anodic oxidation treatment according to the GB/T17899-1999 standard, the pitting potential of 316L stainless steel obviously shifts forward by about 150mV, and the pitting degree is obviously reduced.
Performance of the stainless steel of Table 2.316L after being subjected to different matte technologies
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (3)
1. A stainless steel matte treatment process is characterized by comprising the following process steps:
(I) pretreatment:
A. soaking the stainless steel workpiece in an alkaline solution at 70 +/-5 ℃ for 5-10 min to remove oil stains on the surface of the stainless steel workpiece;
B. placing the stainless steel workpiece after oil stain removal in ultrasonic deionized water for ultrasonic rinsing for 5-10 min, so that dirt on the surface of the stainless steel workpiece is thoroughly cleaned;
C. placing the stainless steel workpiece subjected to ultrasonic treatment in absolute ethyl alcohol, soaking for 10-30 s, and drying;
(II) sub-photo anodic oxidation treatment:
D. connecting the pretreated stainless steel workpiece with the positive electrode of a power supply, and placing the stainless steel workpiece at a position containing 10-50 g/L H3PO4、10~30g/LC6H8O7、100~300g/L H2O2And 0.4-1g/L K2SO4Heating the solution to 60-80 ℃ in the anodic matte oxidation treatment solution of the mixture, and simultaneously connecting a platinum-titanium net with an area ratio of 1:1 with a direct current power supply cathode, wherein the distance between the two electrodes is kept at 6.0cm, and the current density is 3.4-6.8A/dm2Anodizing for 30-60 min under the condition that the working voltage is 9.4-10.5V, so that the surface of the stainless steel workpiece is matt;
(III) post-treatment:
E. and (3) post-treatment: and (3) placing the stainless steel workpiece subjected to the matte treatment in deionized water for washing for 2 times, soaking the stainless steel workpiece in absolute ethyl alcohol for 10-30 seconds, and drying.
2. The matte finishing process for stainless steel according to claim 1, wherein the alkaline solution in step a is 64g/LNaOH, 20g/LNa2CO3、10g/L Na2SiO3And 50g/L Na3PO4One or more of the above, wherein the pH value of the alkaline solution is 8-9.
3. The stainless steel matte treatment process according to claim 2, wherein the drying in the steps C and E is performed by using an oven, hot air drying is performed in a purified environment, and a high-temperature-resistant filter is additionally arranged at an air inlet and an air outlet of an air duct of the oven.
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