CN116875905A - Antimicrobial and microbial corrosion resistant 17-4PH stainless steel and heat treatment method thereof - Google Patents
Antimicrobial and microbial corrosion resistant 17-4PH stainless steel and heat treatment method thereof Download PDFInfo
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 96
- 239000010935 stainless steel Substances 0.000 title claims abstract description 94
- 230000007797 corrosion Effects 0.000 title claims abstract description 67
- 238000005260 corrosion Methods 0.000 title claims abstract description 67
- 238000010438 heat treatment Methods 0.000 title claims abstract description 45
- 230000000813 microbial effect Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000000845 anti-microbial effect Effects 0.000 title claims description 20
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- 238000001816 cooling Methods 0.000 claims description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
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- 239000004599 antimicrobial Substances 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000003054 catalyst Substances 0.000 claims 1
- -1 wherein Substances 0.000 claims 1
- 230000000844 anti-bacterial effect Effects 0.000 abstract description 12
- 230000001580 bacterial effect Effects 0.000 abstract description 3
- 239000007769 metal material Substances 0.000 abstract description 3
- 206010034133 Pathogen resistance Diseases 0.000 abstract 1
- 241000589517 Pseudomonas aeruginosa Species 0.000 description 25
- 230000000052 comparative effect Effects 0.000 description 22
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- 229910052751 metal Inorganic materials 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
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- 239000013535 sea water Substances 0.000 description 3
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- 239000010963 304 stainless steel Substances 0.000 description 2
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 2
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 2
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- 229910000975 Carbon steel Inorganic materials 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
Abstract
The invention discloses an antibacterial and microbial corrosion-resistant 17-4PH stainless steel and a heat treatment method thereof, which relate to the technical field of metal material protection and comprise the following components in percentage by weight: 0.03-0.05%; si is less than or equal to 0.38%; mn is less than or equal to 0.76 percent; cu is less than or equal to 3.27%; cr is less than or equal to 15.71%; nb is less than or equal to 0.23 percent; ni is less than or equal to 3.87%; s is less than or equal to 0.02 percent; p is less than or equal to 0.03%; the balance of Fe and unavoidable impurities, and the heat treatment method comprises the steps of sequentially carrying out solution treatment, adjustment treatment and aging treatment on the 17-4PH stainless steel. The 17-4PH stainless steel prepared by the method for resisting the bacterial and the microbial corrosion not only effectively improves the microbial corrosion resistance, but also has excellent bacterial resistance, can well protect the 17-4PH stainless steel in a microbial corrosion environment, and can effectively prolong the service life of the stainless steel.
Description
Technical Field
The invention relates to the technical field of metal material protection, in particular to an antibacterial and microbial corrosion-resistant 17-4PH stainless steel and a heat treatment method thereof.
Background
Microbial corrosion is commonly found in various environments, such as the atmosphere, soil, sea water, and many engineering fields of marine transportation, oil exploitation, etc., and seriously threatens the service safety of metal materials. Attachment of microorganisms or biofilms to metal surfaces changes the properties of the solution/metal interface, such as pH, O 2 Gradient, ion concentration, and even kinetics of corrosion reactions. These changes can accelerate metal corrosion, resulting in significant economic losses, known as microbial corrosion (MIC).
Stainless steel has been widely used in ocean engineering and its susceptibility to microbial corrosion has become a hot topic. Pseudomonas aeruginosa is a typical gram-negative facultative aerobe, widely distributed in soil, fresh water and marine environments. Numerous studies have shown that pseudomonas aeruginosa biofilms can induce accelerated corrosion of various metals, including carbon steel, stainless steel and high entropy alloys. Xu et al report the corrosion behavior of 2205 duplex stainless steel affected by Pseudomonas aeruginosa and suggest that Pseudomonas aeruginosa can accelerate stainless steel corrosion by electron shuttling mediated extracellular electron transfer processes[D. Xu, E. Zhou, Y. Zhao, et al. Enhanced resistance of 2205 Cu-bearing duplex stainless steel towards microbiologically influenced corrosion by marine aerobic Pseudomonas aeruginosa biofilms, Journal of Materials Science&Technology, 2018, 34: 1325-1336.]. Huang et al first studied the important role of Pyocin (PYO) in the microscopic induction of the EET of 304 stainless steel MIC by Pseudomonas aeruginosa using SECM and they found that the Pseudomonas aeruginosa biofilm injected electrons into the passivation film with the help of PYO, resulting in Fe 3+ Reduction to soluble Fe 2+ A compound to promote deterioration of the passivation film [ l.huang, w.chang, d.zhang, et al Acceleration of corrosion of 304 stainless steel by outward extracellular electron transfer of Pseudomonas aeruginosa biofilm, corrosion Science, 2022, 199: 110159.]. Cui et al illustrate the electron injection process from a Single microbial cell to a passivation film by applying Transmission Electron Microscopy (TEM) and Atomic Force Microscopy (AFM) [ t.cui, h.qian, y.lou, et al, single-cell level investigation of microbiologically induced degradation of passive film of stainless steel via FIB-SEM/TEM and multi-mode AFM, corrosion Science, 2022, 206: 110543.]。
17-4PH (UNS S17400) is a precipitation hardening stainless steel with good corrosion resistance, high mechanical strength and hardness, and is widely applied to the fields of offshore platforms, aircraft fasteners, compressor impellers, medical instruments and the like. Zhao et al found that after solution annealing and conditioning treatment, the seawater corrosion resistance of the 17-4PH stainless steel was improved, and the comprehensive mechanical properties were excellent, mainly due to precipitation and growth of Cu-rich precipitates. As the aging temperature increases, the martensite plate tends to gradually refine and the intergranular precipitates gradually increase [ y. Zhao, f. Wang. Effect of heat treatment processes on seawater corrosion resistance property of 17-4PH steel, journal of Chinese Society of Corrosion and Protection, 2011, 31:473-477 ]. Malakshah et al studied the effect of heat treatment on the fatigue and corrosion fatigue properties of 17-4PH stainless steel under two different heat cycles of aging and overaging, and found that the steel after aging treatment had a higher corrosion rate, lower susceptibility to hydrogen embrittlement, and good corrosion and fatigue resistance [ M.Malakhah, A.Eslami, F.Astrazadeh, et al, effect of heat treatment on corrosion, fatigue, and corrosion fatigue behavior of-4 PH stainless steel, journal of Materials Engineering and Performance, 2022, 1-12 ].
The above studies on 17-4PH stainless steel have focused mainly on corrosion resistance, but lack of study on the problem of microbial corrosion thereof. Furthermore, the effect of commonly used heat treatment methods on microbial corrosion of 17-4PH stainless steel and the search for materials resistant to microbial corrosion have not been reported.
Disclosure of Invention
The invention aims to provide an antibacterial and microbial corrosion-resistant 17-4PH stainless steel and a heat treatment method thereof, so as to solve the problems that the researches on the 17-4PH stainless steel are mainly focused on corrosion resistance and lack of researches on microbial corrosion thereof.
To achieve the above object, the first aspect of the present invention provides an antimicrobial and microbiologically resistant 17-4PH stainless steel comprising, by weight: 0.03-0.05%; si is less than or equal to 0.38%; mn is less than or equal to 0.76 percent; cu is less than or equal to 3.27%; cr is less than or equal to 15.71%; nb is less than or equal to 0.23 percent; ni is less than or equal to 3.87%; s is less than or equal to 0.02 percent; p is less than or equal to 0.03%; the balance being Fe and unavoidable impurities.
The second aspect of the invention provides a heat treatment method of 17-4PH stainless steel with antibacterial and microbial corrosion resistance, which comprises the following steps:
sequentially carrying out solution treatment, adjustment treatment and aging treatment on the 17-4PH stainless steel, wherein,
solution treatment: heating to 1040-1050 ℃ under vacuum condition, preserving heat for 2-3 hours, and then introducing nitrogen into the furnace for cooling;
aging treatment: heating to 480-620 ℃ under vacuum condition, preserving heat for 2-3 hours, and then introducing nitrogen into the furnace for cooling.
Preferably, an adjustment treatment step is further provided between the solution treatment step and the aging treatment step, and the adjustment treatment step is as follows: heating to 780-800 ℃ under vacuum condition, preserving heat for 1-2 hours, and then introducing nitrogen into the furnace for cooling.
Preferably, the heating rate of the solution treatment is 120-150 ℃/h.
Preferably, 2Bar nitrogen is introduced into the furnace for cooling in the solid solution treatment, the cooling speed is 50-80 ℃/h, and the temperature is cooled to 40-60 ℃.
Preferably, the heating rate of the adjustment treatment is 100-120 ℃/h.
Preferably, 2Bar nitrogen is introduced into the furnace for cooling, the cooling speed is 50-80 ℃/h, and the temperature is cooled to 40-60 ℃.
Preferably, the heating rate of the aging treatment is 80-100 ℃/h.
Preferably, 2Bar nitrogen is introduced into the furnace for cooling in the aging treatment, the cooling speed is 50-80 ℃/h, and the temperature is cooled to 40-60 ℃.
Preferably, the heat treated 17-4PH stainless steel has an average grain size of 8.6-10.1 mu m, which is reduced by 43.4-54.5% compared with the as-cast size, and the size of the precipitated copper-rich phase is 20-50nm.
Preferably, the time-efficient treatment heating temperature is 620 ℃, the average grain size of the 17-4PH stainless steel is 8.6 mu m, and the size of the precipitated copper-rich phase is 20-30nm.
The invention provides an application of the prepared 17-4PH stainless steel, and the 17-4PH stainless steel is applied to the field of microbial corrosion protection.
Preferably, the thickness of the biological film is reduced by 63% after 17-4PH stainless steel is soaked in the culture medium inoculated with pseudomonas aeruginosa for 14 days; the corrosion potential and the pitting potential after being soaked in the culture medium inoculated with pseudomonas aeruginosa for 14 days respectively reach-504 mV and 475mV, and the maximum pit depth is 3.248 mu m.
Therefore, the 17-4PH stainless steel with the structure and the heat treatment method thereof have the following beneficial effects:
1. the antibacterial and microbial corrosion-resistant 17-4PH stainless steel prepared by the invention effectively regulates and controls the microstructure of the 17-4PH stainless steel, and the solution treatment can fully dissolve each phase, strengthen solid solution and eliminate stress; the crystal defects are obviously reduced, the grain size is thinned, the components are more uniform, and when the time-efficiency temperature is 620 ℃, the average grain size is reduced to 8.6 mu m, so that the adhesion of pseudomonas aeruginosa is hindered;
2. the antibacterial microbial corrosion resistant 17-4PH stainless steel prepared by the invention separates out nano copper-rich phase with the size of 20-50nm, and releases more Cu 2+ The bacterial activity is reduced, the colony number on the metal surface is obviously reduced, and the antibacterial performance and the microbial corrosion resistance are further improved;
3. the antibacterial and microbial corrosion resistant 17-4PH stainless steel prepared by the invention has better microbial corrosion resistance in pseudomonas aeruginosa environment. When the aging temperature is 620 ℃, the maximum pit depth is reduced to 3.248 mu m, and the pit potential and the corrosion potential reach-504 mV and 475mV respectively;
4. the heat treatment method for the antibacterial and microbial corrosion resistant 17-4PH stainless steel has the advantages of low cost, simple preparation process, controllable process, high production efficiency and the like.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a graph showing the distribution of EBSD grain size and composition of 17-4PH stainless steel prepared in example 1 of the present invention;
FIG. 2 is a transmission electron microscope image of 17-4PH stainless steel prepared in example 1 of the present invention;
FIG. 3 is a graph showing the distribution of fluorescence laser confocal biofilms of the 17-4PH stainless steels of examples 1-4 and comparative example 1 of the present invention;
FIG. 4 is a macroscopic view of the plate colonies of the 17-4PH stainless steel of examples 1-4 and comparative example 1 of the present invention;
FIG. 5 is a potentiodynamic polarization graph of the 17-4PH stainless steel of examples 1-4 and comparative example 1 of the present invention;
FIG. 6 is a graph of laser confocal pit morphology for the 17-4PH stainless steels of examples 1-4 and comparative example 1 of the present invention;
FIG. 7 is a graph showing the EBSD grain size versus composition distribution for an as-cast 17-4PH stainless steel of comparative example 1 of the present invention;
FIG. 8 is a transmission electron micrograph of an as-cast 17-4PH stainless steel of comparative example 1 of the present invention.
Detailed Description
The present invention will be further described below, and it should be noted that the present embodiment provides a detailed implementation manner and a specific operation procedure on the premise of the present technical solution, but the present invention is not limited to the present embodiment.
Example 1
A heat treatment method of antimicrobial and microbial corrosion resistant 17-4PH stainless steel comprises the following steps:
sequentially carrying out solution treatment and aging treatment on the 17-4PH stainless steel, wherein the solution treatment and the aging treatment are specifically as follows:
step 1) solution treatment: under vacuum, heating to 1040 ℃ at a heating rate of 120 ℃/hr. After 2 hours of heat preservation, 2Bar nitrogen is introduced into the furnace for cooling, the cooling speed is 50 ℃/hour, and the temperature is cooled to 40 ℃.
Step 2) aging treatment: heating to 620 ℃ under vacuum, wherein the heating speed is 80 ℃/h. After heat preservation for 2 hours, 2Bar nitrogen is introduced into the furnace for cooling, the cooling speed is 50 ℃/hour, and the temperature is cooled to 40 ℃, thus obtaining the antimicrobial and microbial corrosion resistant 17-4PH stainless steel.
Example 2
The difference from example 1 is that: the heating temperature of the aging treatment was 480 ℃.
Example 3
The difference from example 1 is that: the heating temperature for the aging treatment was 550 ℃.
Example 4
The difference from example 2 is that: one step of adjusting treatment is added between the solution treatment and the aging treatment, and the technological parameters are as follows: heating to 780 ℃ under vacuum, wherein the heating speed is 100 ℃/h, preserving heat for 1 h, introducing 2Bar nitrogen into the furnace for cooling, and cooling to 40 ℃ at the cooling speed of 50 ℃/h.
Comparative example 1
An as-cast 17-4PH stainless steel without heat treatment differs from example 1 only in that: the material was not heat treated.
Test example 1
To demonstrate the microstructure characteristics of the antimicrobial microbiologically resistant 17-4PH stainless steel, the microstructure of the 17-4PH stainless steel after heat treatment was observed by electron back scattering diffraction microscopy (EBSD) and Transmission Electron Microscopy (TEM), and it can be seen from FIGS. 1 and 2 that the average grain size of the 17-4PH stainless steel after heat treatment of example 1 was 8.6 μm, 54.5% smaller than the as-cast size, and the size of the precipitated copper-rich phase was 20-30nm. As can be seen from FIGS. 7 and 8, the average grain size of the 17-4PH stainless steel of comparative example 1, which was not heat-treated, was 18.9. Mu.m, and the grain size was not uniform; the crystal defects are more, the component segregation is more serious, and the nano copper-rich phase is not precipitated in the tissue. The internal crystal defect of the 17-4PH steel subjected to heat treatment prepared by the invention is obviously reduced, the dislocation density is reduced, the crystal grains are refined, the components are more uniform, and the adhesion of pseudomonas aeruginosa is hindered.
Test example 2
To demonstrate the effect of the heat treatment temperature of the antimicrobial microbiologically corrosion resistant 17-4PH stainless steel on the antimicrobial performance, fluorescent laser confocal tests were conducted on examples 1-4 and comparative example 1, and it can be seen from FIG. 3 that the surface biofilm thickness of the 17-4PH stainless steel of example 1 was 6 μm, the surface biofilm thickness of the 17-4PH stainless steel of example 2 was 12 μm, the surface biofilm thickness of the 17-4PH stainless steel of example 3 was 11 μm, the surface biofilm thickness of the 17-4PH stainless steel of example 4 was 7 μm, and the surface biofilm thickness of the 17-4PH stainless steel of comparative example 1 was 16 μm after soaking in the culture medium inoculated with Pseudomonas aeruginosa for 14 days. The apparent biofilm thickness of examples 1-4 is significantly less than that of comparative example 1, demonstrating that the heat treatment process of the present invention can improve the antimicrobial properties of 17-4PH stainless steel, also because the heat treated 17-4PH steel begins to precipitate nano copper-rich phases, more Cu 2+ The release of (2) results in a decrease in bacterial activity, a significant decrease in the number of colonies on the metal surface, and precipitation of copper-rich phases further enhances antibacterial properties.
As can be seen from FIG. 4, the stainless steel of comparative example 1, which had been immersed in the culture medium inoculated with Pseudomonas aeruginosa for 14 days, had a colony count of 735, the colony count of example 1 was reduced by 98% from the as-cast 17-4PH of comparative example 1, the colony count of example 2 was reduced by 74% from the as-cast 17-4PH of comparative example 1, the colony count of example 3 was reduced by 83% from the as-cast 17-4PH of comparative example 1, and the colony count of example 4 was reduced by 89% from the as-cast 17-4PH of comparative example 1. The apparent reduction in colony numbers for examples 1-4 compared to comparative example 1 demonstrates the antimicrobial properties of the present invention.
Test example 3
In order to demonstrate the effect of the heat treatment temperature of the antimicrobial and microbial corrosion resistant 17-4PH stainless steel on the microbial corrosion resistance, the potentiodynamic polarization curve test was conducted on the stainless steel of example 1-4 and comparative example 1, it can be seen from FIG. 5 and Table 1 that the corrosion potential of the stainless steel of example 1 after soaking in the culture medium inoculated with Pseudomonas aeruginosa for 14 days was increased to-504 mV, the corrosion potential of the stainless steel of example 4 after soaking in the culture medium inoculated with Pseudomonas aeruginosa was increased to 475mV, the corrosion potential and the corrosion potential of the stainless steel of example 2 after soaking in the culture medium inoculated with Pseudomonas aeruginosa for 14 days were-645 mV and 185mV, respectively, the corrosion potential of the stainless steel of example 3 after soaking in the culture medium inoculated with Pseudomonas aeruginosa for 14 days and the corrosion potential of the stainless steel of example 4 after soaking in the culture medium inoculated with Pseudomonas aeruginosa for 14 days were-627 mV and 199mV, respectively, the corrosion potential of the stainless steel of example 4 after soaking in the culture medium inoculated with Pseudomonas aeruginosa for 14 days was-532 mV and 335mV, the corrosion potential of the stainless steel of example 4 after soaking in the culture medium inoculated with Pseudomonas aeruginosa strain was 1, the corrosion potential of the stainless steel of example 1-4 after soaking in the Pseudomonas aeruginosa and the stainless steel of the invention was prepared, the stainless steel of example 1 was compared with the stainless steel of example 1, and the stainless steel of example 1 was prepared, and the stainless steel of example 1 has excellent corrosion resistance to the invention, and the invention has excellent corrosion resistance to the invention.
The laser confocal test was performed on examples 1 to 4 and comparative example 1 to observe the surface pits, and it can be seen from FIG. 6 that the maximum pit depth after soaking of the 17-4PH stainless steel of comparative example 1 in the culture medium inoculated with Pseudomonas aeruginosa for 14 days was 11.497 μm, the pit depth after soaking of the 17-4PH stainless steel of example 1 in the culture medium inoculated with Pseudomonas aeruginosa for 14 days was reduced to 3.248 μm, the maximum pit depth of example 2 was 8.259 μm, the maximum pit depth of example 3 was 7.328 μm, and the maximum pit depth of example 4 was 4.582 μm. The maximum pit depths of examples 1-4 are all less than comparative example 1, indicating that the microbial corrosion resistance of the heat treated 17-4PH stainless steel of the present invention is higher than that of the non-heat treated 17-4PH stainless steel of comparative example 1.
In conclusion, the thickness of the biological film of the heat-treated 17-4PH stainless steel is reduced by 25% -63% compared with that of the cast 17-4PH stainless steel; the colony quantity is reduced by 74% -98% compared with the cast 17-4 PH; the corrosion potential is increased by 92 mV-232 mV, the pitting potential is increased by 7 mV-297 mV, and the pit depth is reduced by 28% -72%. The heat treatment has good improvement effect on the antibacterial property and the microbial corrosion resistance of the 17-4PH stainless steel.
Therefore, the 17-4PH stainless steel with the structure and the heat treatment method thereof not only effectively improve the microbial corrosion resistance, but also have excellent antibacterial performance, can well protect the 17-4PH stainless steel in a microbial corrosion environment, and can effectively prolong the service life of the stainless steel.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting it, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the invention can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the invention.
Claims (10)
1. An antimicrobial, microbiologically resistant, 17-4PH stainless steel, characterized by: the weight percentage of the catalyst comprises C: 0.03-0.05%; si is less than or equal to 0.38%; mn is less than or equal to 0.76 percent; cu is less than or equal to 3.27%; cr is less than or equal to 15.71%; nb is less than or equal to 0.23 percent; ni is less than or equal to 3.87%; s is less than or equal to 0.02 percent; p is less than or equal to 0.03%; the balance being Fe and unavoidable impurities.
2. The method for heat treating an antimicrobial microbiologically resistant 17-4PH stainless steel according to claim 1, wherein: the method comprises the following steps:
sequentially carrying out solution treatment and aging treatment on the 17-4PH stainless steel, wherein,
solution treatment: heating to 1040-1050 ℃ under vacuum condition, preserving heat for 2-3 hours, and then introducing nitrogen into the furnace for cooling;
aging treatment: heating to 480-620 ℃ under vacuum condition, preserving heat for 2-3 hours, and then introducing nitrogen into the furnace for cooling.
3. The method for heat treating an antimicrobial microbiologically resistant 17-4PH stainless steel according to claim 2, characterized in that: an adjusting treatment step is further arranged between the solution treatment step and the aging treatment step, and is used for adjusting: heating to 780-800 ℃ under vacuum condition, preserving heat for 1-2 hours, and then introducing nitrogen into the furnace for cooling.
4. A method for heat treating an antimicrobial microbiologically resistant 17-4PH stainless steel according to claim 3, characterized in that: the heating speed of the solution treatment is 120-150 ℃/h, 2Bar nitrogen is introduced into the furnace for cooling, the cooling speed is 50-80 ℃/h, and the temperature is cooled to 40-60 ℃.
5. The method for heat treating an antimicrobial microbiologically resistant 17-4PH stainless steel according to claim 4, wherein: the heating speed of the adjustment treatment is 100-120 ℃/h.
6. The method for heat treating an antimicrobial microbiologically resistant 17-4PH stainless steel according to claim 5, wherein: and 2Bar nitrogen is introduced into the furnace for cooling, the cooling speed is 50-80 ℃/h, and the temperature is cooled to 40-60 ℃.
7. The method for heat treating an antimicrobial microbiologically resistant 17-4PH stainless steel according to claim 6, wherein: the heating speed of the aging treatment is 80-100 ℃/h.
8. The method for heat treating an antimicrobial microbiologically resistant 17-4PH stainless steel according to claim 7, wherein: and 2Bar nitrogen is introduced into the furnace for cooling in the aging treatment, the cooling speed is 50-80 ℃/h, and the temperature is cooled to 40-60 ℃.
9. The method for heat treating an antimicrobial microbiologically resistant 17-4PH stainless steel according to claim 8, wherein: when the heating temperature of the aging treatment is 620 ℃, the average grain size of the 17-4PH stainless steel is 8.6 mu m, and the size of the precipitated copper-rich phase is 20-30nm.
10. Use of the prepared 17-4PH stainless steel according to claims 2-9, characterized in that: the 17-4PH stainless steel is applied to the field of microbial corrosion protection.
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