CN117904487A - Zinc-free lead-free multielement physical scale prevention alloy and manufacturing process thereof - Google Patents
Zinc-free lead-free multielement physical scale prevention alloy and manufacturing process thereof Download PDFInfo
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Abstract
The invention discloses a zinc-free lead-free multielement physical scale prevention alloy, which comprises the following components in percentage by mass: 60.5 to 76.0wt.% of Cu; 18.0 to 25.0wt.% of Ni; 2.0 to 5.0wt.% of Co; 0.5 to 5.0wt.% of Fe; AL 0.2 to 3.5wt.%. The materials are subjected to a specific smelting step to form an anti-scaling alloy with a dendrite metallographic structure, a countless micro-battery system is formed on the anti-scaling alloy, when oilfield produced water fluid is fully contacted with the alloy, the fluid and the alloy are subjected to solid-liquid-electronic interaction, physical properties (such as surface tension, electrostatic potential and the like) of shale oil are regulated, the bonding environment of scaling ions such as calcium ions and carbonate ions is severely disturbed and destroyed, the nucleation and growth process of scaling crystals is influenced, the morphology of the scaling crystals is changed, scaling matters are in a fraction state which is not easy to adhere, and excellent anti-scaling performance is achieved.
Description
Technical Field
The invention relates to the technical field of oilfield exploitation, transportation and water treatment scale prevention, and provides a zinc-free lead-free multielement physical scale prevention alloy and a manufacturing process thereof.
Background
Highly mineralized oil wells in petroleum extraction processes, the well fluids often contain large amounts of mineral elements that can have damaging effects on tubing, sucker rods, and other equipment in the well. Salt formation, scaling, paraffin deposition are detrimental to the efficient operation of the pumping equipment and during cleanup, the equipment may be shut down, resulting in lost production, labor costs, and other expenses.
The oilfield produced water often contains more Ca 2+、Ba2+、CO3 2-、SO4 2- plasma. As the solubility of the solution changes with changes in the environment, the concentration of cations and anions in the solution exceeds the saturation limit and the solution becomes supersaturated and crystallization and subsequent scale precipitation occur. The most common and most harmful scales in oil and gas development are mainly calcium carbonate scale (CaCO 3), calcium sulfate scale (CaSO 4), barium sulfate scale (BaSO 4), strontium sulfate scale (SrSO 4) and the like.
The formation of inorganic scale is roughly carried out through four processes of polymerization, nucleation, crystal growth and scaling. When the solute in the solution reaches supersaturation, anions and cations such as: ca 2+ collides with CO 3 2-/SO4 2- to form ion pairs. They then form polymers that become small crystal centers, embryos or micronuclei. These micro-polymers become the center of nucleation and play an important role in nucleation. The crystallites formed in the solution aggregate and/or adsorb to the solid surface, grow into larger crystallites, and then grow and fuse to form deposited crystallites. By further adsorbing additional scale ions in the solution, the crystallites formed start to grow continuously and the surface starts to form scale.
At present, the relatively wide scale prevention technology is applied and can be divided into a physical scale prevention technology and a chemical scale prevention technology. Physical scale control techniques, which utilize a physical field to control scale formation, are commonly known as electric field scale control, magnetic field scale control, ultrasonic scale control, and the like. The chemical scale prevention is realized by adding the scale inhibitor into water, but the addition of the scale inhibitor often makes the follow-up treatment process difficult, and meanwhile, the environment is also harmed to a certain extent, so that the multi-alloy scale prevention technology has excellent scale prevention performance, is environment-friendly, safe and stable, has no energy consumption, and is a potential scale prevention technology. The existing mature scale-proof alloy system has a plurality of elements, but generally contains a certain amount of zinc and a certain amount of lead, and the part of zinc and lead can enter water in an ionic state after contacting with oilfield produced water, so that even if the part of oilfield produced water is treated by sewage in the later stage, a large amount of zinc and lead still exist, and when the part of water is discharged into the environment in a large amount, domestic water is polluted, so that great potential safety hazards are caused to the treatment of domestic water.
Disclosure of Invention
In view of the above-mentioned shortcomings, the present invention aims to provide a zinc-free lead-free multi-element physical scale preventing alloy and a manufacturing process thereof, which are used for solving the scaling problem in fluid, relieving the maintenance pressure on equipment in oilfield exploitation and transportation, and saving the cost. Meanwhile, the pollution of zinc, lead and the like to the environment is greatly reduced, and the limit of the content of zinc and lead in civil water is met.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a zinc-free lead-free multi-element physical scale preventing alloy, which comprises the following components in percentage by mass:
Cu 60.5～76.0wt.％；
Ni 18.0～25.0wt.％；
Co 2.0～5.0wt.％；
Fe 0.5～5.0wt.％；
AL 0.2～3.5wt.％。
preferably, the multi-element physical scale preventing alloy material is a dendrite metallographic structure.
A process for manufacturing a zinc-free lead-free multi-element physical scale control alloy, comprising the steps of:
S1: according to the content of Cu 60.5-75.0 wt%, ni 18.0-25.0 wt%, co 2.0-5.0 wt%, fe 0.5-5.0 wt%, al 0.2-3.5 wt%, pure copper, pure nickel, pure cobalt, pure iron powder and pure aluminum particles are weighed, and surface stains and oxide skin are removed.
S2: putting the pure copper and the pure nickel in the step S1 into a clean graphite crucible with a quartz protective sleeve, then putting the crucible together with the pure copper and the pure nickel therein onto a medium frequency induction furnace, starting the medium frequency induction furnace to heat and preheat the pure copper and the pure nickel in the crucible in the medium frequency induction furnace, wherein the preheating temperature is 150-250 ℃ and the preheating time is 10-20 min so as to remove water in the crucible; simultaneously placing pure cobalt, pure iron powder and pure aluminum into a baking oven at 150 ℃ for constant temperature for standby;
S3: heating the medium frequency induction furnace in the step S2 to 1200-1250 ℃ at a heating rate of 50 ℃/h, and adding charcoal covering agent in the smelting process to ensure that the surface of the smelted metal is covered by charcoal to isolate air; adding preheated iron powder when the pure copper and the pure nickel are completely melted and the temperature of the melt reaches 1200 ℃, keeping the temperature and standing for 3-5 min, adding preheated pure cobalt, keeping the temperature for 5-10 min, stirring for 1-2 min, turning off a power supply of an intermediate frequency induction furnace, adding aluminum after the temperature is reduced to 700 ℃, keeping the temperature for 10min, and stirring for 1-2 min again after the aluminum is completely melted; then the molten alloy is quickly heated to 1200-1250 ℃ within 30 minutes;
S4: and (3) when the temperature of the induction furnace reaches 1200-1250 ℃, closing the induction furnace for heating, taking out the scum on the surface of the melt, taking out the crucible, pouring the melt into a graphite mold preheated to 200 ℃, and naturally cooling after solidification to obtain an ingot.
Compared with the prior art, the invention has the beneficial effects that: 1. the anti-scaling alloy disclosed by the invention only contains 5 elements in specific mass percent: the copper, nickel, cobalt, iron and aluminum have low element content, particularly no lead and zinc elements, can completely avoid the lead and zinc superscale problem of the water treatment scale-proof alloy, is more environment-friendly and pollution-free, and can be widely applied to the field of water treatment. 2. The introduction of aluminum element in the scheme greatly improves the processability and the scale prevention performance of the alloy.
Drawings
Fig. 1 is an as-cast optical micrograph of the antifouling alloy material of examples 1 and 2 of the present invention, (1) is a metallographic photograph of example 1, and (2) is a metallographic photograph of example 2.
Fig. 2 is an as-cast optical micrograph of the antifouling alloy material of examples 3 and 4 of the present invention, (3) is a metallographic photograph of example 3, and (4) is a metallographic photograph of example 4.
Fig. 3 is an as-cast optical micrograph of the antifouling alloy material of examples 5 and 6 of the present invention, (5) is a metallographic photograph of example 5, and (6) is a metallographic photograph of example 6.
FIG. 4 is an as-cast optical micrograph of the fouling preventive alloy material in example 7 of the invention, and (7) is a metallographic photograph of example 7.
FIG. 5 is a scanning electron micrograph of scale on a control panel hanger.
FIGS. 6-12 are scanning electron micrographs of scale on the hanging sheets of examples 1-7 of the present invention.
Scanning Electron Microscope (SEM) photographs (fig. 5 to 12) of the test results of the scale prevention test of the present invention, in which the spots are all calcium carbonate scale. It is evident from the figure that the scale on the N80 steel hanger plate treated with the multi-element anti-fouling alloy is significantly less than the untreated hanger plate.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
A zinc-free lead-free multi-element physical scale preventing alloy, which comprises the following components in percentage by mass:
Cu 71.0wt.％；
Ni 23.0wt.％；
Co 3.5wt.％；
Fe 1.5wt.％；
Al 1wt.％。
a process for manufacturing a zinc-free lead-free multi-element physical scale control alloy, comprising the steps of:
S1: according to the content of Cu 71.0wt.%, ni 23.0wt.%, co 3.5wt.%, fe 1.5wt.%, and Al1wt.%, pure copper, pure nickel, pure cobalt, pure iron powder, pure aluminum particles are weighed and surface stains and oxide scales are removed.
S2: putting the pure copper and the pure nickel in the step S1 into a clean graphite crucible with a quartz protective sleeve, then putting the crucible together with the pure copper and the pure nickel therein onto a medium frequency induction furnace, starting the medium frequency induction furnace to heat and preheat the pure copper and the pure nickel in the crucible in the medium frequency induction furnace, wherein the preheating temperature is 150-250 ℃ and the preheating time is 10-20 min so as to remove water in the crucible; simultaneously placing pure cobalt, pure iron powder and pure aluminum into a baking oven at 150 ℃ for constant temperature for standby;
S3: heating the medium frequency induction furnace in the step S2 to 1200-1250 ℃ at a heating rate of 50 ℃/h, and adding charcoal covering agent in the smelting process to ensure that the surface of the smelted metal is covered by charcoal to isolate air; adding preheated iron powder when the pure copper and the pure nickel are completely melted and the temperature of the melt reaches 1200 ℃, keeping the temperature and standing for 3-5 min, adding preheated pure cobalt, keeping the temperature for 5-10 min, stirring for 1-2 min, turning off a power supply of an intermediate frequency induction furnace, adding aluminum after the temperature is reduced to 700 ℃, keeping the temperature for 10min, and stirring for 1-2 min again after the aluminum is completely melted; then the molten alloy is quickly heated to 1200-1250 ℃ within 30 minutes;
S4: and (3) when the temperature of the induction furnace reaches 1200-1250 ℃, closing the induction furnace for heating, taking out the scum on the surface of the melt, taking out the crucible, pouring the melt into a graphite mold preheated to 200 ℃, and naturally cooling after solidification to obtain an ingot.
The metallurgical structure of the anti-scale alloy prepared by the process is a dendrite metallurgical structure, and a large amount of component differences exist between dendrites and branches of dendrites, so that the component segregation of the alloy in the metallurgical structure is caused, and the micro-battery system can be formed in a large amount in the anti-scale alloy when the segregation is caused, so that the anti-scale effect of the anti-scale alloy can be effectively improved. In addition, the effect of introducing aluminum into the components of the anti-scaling alloy in the scheme is that the electrode potential of aluminum is lower than the electrode potential of zinc in the traditional anti-scaling alloy of-1.660V, so that the micro battery system formed in the anti-scaling alloy containing aluminum has stronger electron release capacity than the anti-scaling alloy of the traditional zinc and lead system, and has extremely strong anti-scaling capacity improving effect.
Example 2
A zinc-free lead-free multi-element physical scale preventing alloy, which comprises the following components in percentage by mass:
Cu 68.0wt.％；
Ni 26.0wt.％；
Co 3.0wt.％；
Fe 2.0wt.％；
Al 1wt.％。
a process for manufacturing a zinc-free lead-free multi-element physical scale control alloy, comprising the steps of:
S1: pure copper, pure nickel, pure cobalt, pure iron powder, pure aluminum particles were weighed according to the weight percentages of the above contents of 68.0wt.% of Cu, 26.0wt.% of Ni, 3.0wt.% of Co, 2.0wt.% of Fe, and 1wt.% of Al, and surface stains and scale were removed.
S2: putting the pure copper and the pure nickel in the step S1 into a clean graphite crucible with a quartz protective sleeve, then putting the crucible together with the pure copper and the pure nickel therein onto a medium frequency induction furnace, starting the medium frequency induction furnace to heat and preheat the pure copper and the pure nickel in the crucible in the medium frequency induction furnace, wherein the preheating temperature is 150-250 ℃ and the preheating time is 10-20 min so as to remove water in the crucible; simultaneously placing pure cobalt, pure iron powder and pure aluminum into a baking oven at 150 ℃ for constant temperature for standby;
S3: heating the medium frequency induction furnace in the step S2 to 1200-1250 ℃ at a heating rate of 50 ℃/h, and adding charcoal covering agent in the smelting process to ensure that the surface of the smelted metal is covered by charcoal to isolate air; adding preheated iron powder when the pure copper and the pure nickel are completely melted and the temperature of the melt reaches 1200 ℃, keeping the temperature and standing for 3-5 min, adding preheated pure cobalt, keeping the temperature for 5-10 min, stirring for 1-2 min, turning off a power supply of an intermediate frequency induction furnace, adding aluminum after the temperature is reduced to 700 ℃, keeping the temperature for 10min, and stirring for 1-2 min again after the aluminum is completely melted; then the molten alloy is quickly heated to 1200-1250 ℃ within 30 minutes;
S4: and (3) when the temperature of the induction furnace reaches 1200-1250 ℃, closing the induction furnace for heating, taking out the scum on the surface of the melt, taking out the crucible, pouring the melt into a graphite mold preheated to 200 ℃, and naturally cooling after solidification to obtain an ingot.
The metallurgical structure of the anti-scale alloy prepared by the process is a dendrite metallurgical structure, and a large amount of component differences exist between dendrites and branches of dendrites, so that the component segregation of the alloy in the metallurgical structure is caused, and the micro-battery system can be formed in a large amount in the anti-scale alloy when the segregation is caused, so that the anti-scale effect of the anti-scale alloy can be effectively improved. In addition, the effect of introducing aluminum into the components of the anti-scaling alloy in the scheme is that the electrode potential of aluminum is lower than the electrode potential of zinc in the traditional anti-scaling alloy of-1.660V, so that the micro battery system formed in the anti-scaling alloy containing aluminum has stronger electron release capacity than the anti-scaling alloy of the traditional zinc and lead system, and has extremely strong anti-scaling capacity improving effect.
Example 3
A zinc-free lead-free multi-element physical scale preventing alloy, which comprises the following components in percentage by mass:
Cu 65.0wt.％；
Ni 26.0wt.％；
Co 4.5wt.％；
Fe 1.5wt.％；
Al 3wt.％。
a process for manufacturing a zinc-free lead-free multi-element physical scale control alloy, comprising the steps of:
s1: according to the weight percentages of 65.0wt.% of Cu, 26.0wt.% of Ni, 4.5wt.% of Co, 1.5wt.% of Fe and 3wt.% of Al, pure copper, pure nickel, pure cobalt, pure iron powder and pure aluminum particles are weighed, and surface stains and oxide scales are removed.
S2: putting the pure copper and the pure nickel in the step S1 into a clean graphite crucible with a quartz protective sleeve, then putting the crucible together with the pure copper and the pure nickel therein onto a medium frequency induction furnace, starting the medium frequency induction furnace to heat and preheat the pure copper and the pure nickel in the crucible in the medium frequency induction furnace, wherein the preheating temperature is 150-250 ℃ and the preheating time is 10-20 min so as to remove water in the crucible; simultaneously placing pure cobalt, pure iron powder and pure aluminum into a baking oven at 150 ℃ for constant temperature for standby;
S3: heating the medium frequency induction furnace in the step S2 to 1200-1250 ℃ at a heating rate of 50 ℃/h, and adding charcoal covering agent in the smelting process to ensure that the surface of the smelted metal is covered by charcoal to isolate air; adding preheated iron powder when the pure copper and the pure nickel are completely melted and the temperature of the melt reaches 1200 ℃, keeping the temperature and standing for 3-5 min, adding preheated pure cobalt, keeping the temperature for 5-10 min, stirring for 1-2 min, turning off a power supply of an intermediate frequency induction furnace, adding aluminum after the temperature is reduced to 700 ℃, keeping the temperature for 10min, and stirring for 1-2 min again after the aluminum is completely melted; then the molten alloy is quickly heated to 1200-1250 ℃ within 30 minutes;
S4: and (3) when the temperature of the induction furnace reaches 1200-1250 ℃, closing the induction furnace for heating, taking out the scum on the surface of the melt, taking out the crucible, pouring the melt into a graphite mold preheated to 200 ℃, and naturally cooling after solidification to obtain an ingot.
The metallurgical structure of the anti-scale alloy prepared by the process is a dendrite metallurgical structure, and a large amount of component differences exist between dendrites and branches of dendrites, so that the component segregation of the alloy in the metallurgical structure is caused, and the micro-battery system can be formed in a large amount in the anti-scale alloy when the segregation is caused, so that the anti-scale effect of the anti-scale alloy can be effectively improved. In addition, the effect of introducing aluminum into the components of the anti-scaling alloy in the scheme is that the electrode potential of aluminum is lower than the electrode potential of zinc in the traditional anti-scaling alloy of-1.660V, so that the micro battery system formed in the anti-scaling alloy containing aluminum has stronger electron release capacity than the anti-scaling alloy of the traditional zinc and lead system, and has extremely strong anti-scaling capacity improving effect.
Example 4
A zinc-free lead-free multi-element physical scale preventing alloy, which comprises the following components in percentage by mass:
Cu 70.0wt.％；
Ni 24.0wt.％；
Co 3.0wt.％；
Fe 2.0wt.％；
Al 1wt.％。
a process for manufacturing a zinc-free lead-free multi-element physical scale control alloy, comprising the steps of:
S1: according to the weight percentages of 70.0wt.% of Cu, 24.0wt.% of Ni, 3.0wt.% of Co, 2.0wt.% of Fe and 1wt.% of Al, pure copper, pure nickel, pure cobalt, pure iron powder and pure aluminum particles are weighed, and surface stains and oxide scales are removed.
S2: putting the pure copper and the pure nickel in the step S1 into a clean graphite crucible with a quartz protective sleeve, then putting the crucible together with the pure copper and the pure nickel therein onto a medium frequency induction furnace, starting the medium frequency induction furnace to heat and preheat the pure copper and the pure nickel in the crucible in the medium frequency induction furnace, wherein the preheating temperature is 150-250 ℃ and the preheating time is 10-20 min so as to remove water in the crucible; simultaneously placing pure cobalt, pure iron powder and pure aluminum into a baking oven at 150 ℃ for constant temperature for standby;
S3: heating the medium frequency induction furnace in the step S2 to 1200-1250 ℃ at a heating rate of 50 ℃/h, and adding charcoal covering agent in the smelting process to ensure that the surface of the smelted metal is covered by charcoal to isolate air; adding preheated iron powder when the pure copper and the pure nickel are completely melted and the temperature of the melt reaches 1200 ℃, keeping the temperature and standing for 3-5 min, adding preheated pure cobalt, keeping the temperature for 5-10 min, stirring for 1-2 min, turning off a power supply of an intermediate frequency induction furnace, adding aluminum after the temperature is reduced to 700 ℃, keeping the temperature for 10min, and stirring for 1-2 min again after the aluminum is completely melted; then the molten alloy is quickly heated to 1200-1250 ℃ within 30 minutes;
S4: and (3) when the temperature of the induction furnace reaches 1200-1250 ℃, closing the induction furnace for heating, taking out the scum on the surface of the melt, taking out the crucible, pouring the melt into a graphite mold preheated to 200 ℃, and naturally cooling after solidification to obtain an ingot.
The metallurgical structure of the anti-scale alloy prepared by the process is a dendrite metallurgical structure, and a large amount of component differences exist between dendrites and branches of dendrites, so that the component segregation of the alloy in the metallurgical structure is caused, and the micro-battery system can be formed in a large amount in the anti-scale alloy when the segregation is caused, so that the anti-scale effect of the anti-scale alloy can be effectively improved. In addition, the effect of introducing aluminum into the components of the anti-scaling alloy in the scheme is that the electrode potential of aluminum is lower than the electrode potential of zinc in the traditional anti-scaling alloy of-1.660V, so that the micro battery system formed in the anti-scaling alloy containing aluminum has stronger electron release capacity than the anti-scaling alloy of the traditional zinc and lead system, and has extremely strong anti-scaling capacity improving effect.
Example 5
A zinc-free lead-free multi-element physical scale preventing alloy, which comprises the following components in percentage by mass:
Cu 60.5wt.％；
Ni 26.0wt.％；
Co 5wt.％；
Fe 5wt.％；
Al 3.5wt.％。
a process for manufacturing a zinc-free lead-free multi-element physical scale control alloy, comprising the steps of:
S1: pure copper, pure nickel, pure cobalt, pure iron powder, pure aluminum particles are weighed according to the weight percentages of 60.5wt.% of Cu, 26.0wt.% of Ni, 5wt.% of Co and 5wt.% of Fe and 3.5wt.% of Al, and surface stains and oxide scales are removed.
S2: putting the pure copper and the pure nickel in the step S1 into a clean graphite crucible with a quartz protective sleeve, then putting the crucible together with the pure copper and the pure nickel therein onto a medium frequency induction furnace, starting the medium frequency induction furnace to heat and preheat the pure copper and the pure nickel in the crucible in the medium frequency induction furnace, wherein the preheating temperature is 150-250 ℃ and the preheating time is 10-20 min so as to remove water in the crucible; simultaneously placing pure cobalt, pure iron powder and pure aluminum into a baking oven at 150 ℃ for constant temperature for standby;
S3: heating the medium frequency induction furnace in the step S2 to 1200-1250 ℃ at a heating rate of 50 ℃/h, and adding charcoal covering agent in the smelting process to ensure that the surface of the smelted metal is covered by charcoal to isolate air; adding preheated iron powder when the pure copper and the pure nickel are completely melted and the temperature of the melt reaches 1200 ℃, keeping the temperature and standing for 3-5 min, adding preheated pure cobalt, keeping the temperature for 5-10 min, stirring for 1-2 min, turning off a power supply of an intermediate frequency induction furnace, adding aluminum after the temperature is reduced to 700 ℃, keeping the temperature for 10min, and stirring for 1-2 min again after the aluminum is completely melted; then the molten alloy is quickly heated to 1200-1250 ℃ within 30 minutes;
S4: and (3) when the temperature of the induction furnace reaches 1200-1250 ℃, closing the induction furnace for heating, taking out the scum on the surface of the melt, taking out the crucible, pouring the melt into a graphite mold preheated to 200 ℃, and naturally cooling after solidification to obtain an ingot.
The metallurgical structure of the anti-scale alloy prepared by the process is a dendrite metallurgical structure, and a large amount of component differences exist between dendrites and branches of dendrites, so that the component segregation of the alloy in the metallurgical structure is caused, and the micro-battery system can be formed in a large amount in the anti-scale alloy when the segregation is caused, so that the anti-scale effect of the anti-scale alloy can be effectively improved. In addition, the effect of introducing aluminum into the components of the anti-scaling alloy in the scheme is that the electrode potential of aluminum is lower than the electrode potential of zinc in the traditional anti-scaling alloy of-1.660V, so that the micro battery system formed in the anti-scaling alloy containing aluminum has stronger electron release capacity than the anti-scaling alloy of the traditional zinc and lead system, and has extremely strong anti-scaling capacity improving effect.
Example 6
A zinc-free lead-free multi-element physical scale preventing alloy, which comprises the following components in percentage by mass:
Cu 76wt.％；
Ni 18.0wt.％；
Co 2.0wt.％；
Fe 0.5wt.％；
Al 3.5wt.％。
a process for manufacturing a zinc-free lead-free multi-element physical scale control alloy, comprising the steps of:
S1: pure copper, pure nickel, pure cobalt, pure iron powder, pure aluminum particles were weighed according to the weight percentages of the above contents of Cu 76wt.%, ni 18.0wt.%, co 2.0wt.%, fe 0.5wt.%, and al3.5wt.%, and surface stains and scale were removed.
S2: putting the pure copper and the pure nickel in the step S1 into a clean graphite crucible with a quartz protective sleeve, then putting the crucible together with the pure copper and the pure nickel therein onto a medium frequency induction furnace, starting the medium frequency induction furnace to heat and preheat the pure copper and the pure nickel in the crucible in the medium frequency induction furnace, wherein the preheating temperature is 150-250 ℃ and the preheating time is 10-20 min so as to remove water in the crucible; simultaneously placing pure cobalt, pure iron powder and pure aluminum into a baking oven at 150 ℃ for constant temperature for standby;
S3: heating the medium frequency induction furnace in the step S2 to 1200-1250 ℃ at a heating rate of 50 ℃/h, and adding charcoal covering agent in the smelting process to ensure that the surface of the smelted metal is covered by charcoal to isolate air; adding preheated iron powder when the pure copper and the pure nickel are completely melted and the temperature of the melt reaches 1200 ℃, keeping the temperature and standing for 3-5 min, adding preheated pure cobalt, keeping the temperature for 5-10 min, stirring for 1-2 min, turning off a power supply of an intermediate frequency induction furnace, adding aluminum after the temperature is reduced to 700 ℃, keeping the temperature for 10min, and stirring for 1-2 min again after the aluminum is completely melted; then the molten alloy is quickly heated to 1200-1250 ℃ within 30 minutes;
S4: and (3) when the temperature of the induction furnace reaches 1200-1250 ℃, closing the induction furnace for heating, taking out the scum on the surface of the melt, taking out the crucible, pouring the melt into a graphite mold preheated to 200 ℃, and naturally cooling after solidification to obtain an ingot.
The metallurgical structure of the anti-scale alloy prepared by the process is a dendrite metallurgical structure, and a large amount of component differences exist between dendrites and branches of dendrites, so that the component segregation of the alloy in the metallurgical structure is caused, and the micro-battery system can be formed in a large amount in the anti-scale alloy when the segregation is caused, so that the anti-scale effect of the anti-scale alloy can be effectively improved. In addition, the effect of introducing aluminum into the components of the anti-scaling alloy in the scheme is that the electrode potential of aluminum is lower than the electrode potential of zinc in the traditional anti-scaling alloy of-1.660V, so that the micro battery system formed in the anti-scaling alloy containing aluminum has stronger electron release capacity than the anti-scaling alloy of the traditional zinc and lead system, and has extremely strong anti-scaling capacity improving effect.
Example 7
A zinc-free lead-free multi-element physical scale preventing alloy, which comprises the following components in percentage by mass:
Cu 76wt.％；
Ni 21.3wt.％；
Co 2.0wt.％；
Fe 0.5wt.％；
Al 0.2wt.％。
a process for manufacturing a zinc-free lead-free multi-element physical scale control alloy, comprising the steps of:
S1: pure copper, pure nickel, pure cobalt, pure iron powder, pure aluminum particles were weighed according to the weight percentages of the above contents of Cu 76wt.%, ni 21.3wt.%, co 2.0wt.%, fe 0.5wt.%, al0.2wt.%, and surface stains and scale were removed.
S2: putting the pure copper and the pure nickel in the step S1 into a clean graphite crucible with a quartz protective sleeve, then putting the crucible together with the pure copper and the pure nickel therein onto a medium frequency induction furnace, starting the medium frequency induction furnace to heat and preheat the pure copper and the pure nickel in the crucible in the medium frequency induction furnace, wherein the preheating temperature is 150-250 ℃ and the preheating time is 10-20 min so as to remove water in the crucible; simultaneously placing pure cobalt, pure iron powder and pure aluminum into a baking oven at 150 ℃ for constant temperature for standby;
S3: heating the medium frequency induction furnace in the step S2 to 1200-1250 ℃ at a heating rate of 50 ℃/h, and adding charcoal covering agent in the smelting process to ensure that the surface of the smelted metal is covered by charcoal to isolate air; adding preheated iron powder when the pure copper and the pure nickel are completely melted and the temperature of the melt reaches 1200 ℃, keeping the temperature and standing for 3-5 min, adding preheated pure cobalt, keeping the temperature for 5-10 min, stirring for 1-2 min, turning off a power supply of an intermediate frequency induction furnace, adding aluminum after the temperature is reduced to 700 ℃, keeping the temperature for 10min, and stirring for 1-2 min again after the aluminum is completely melted; then the molten alloy is quickly heated to 1200-1250 ℃ within 30 minutes;
S4: and (3) when the temperature of the induction furnace reaches 1200-1250 ℃, closing the induction furnace for heating, taking out the scum on the surface of the melt, taking out the crucible, pouring the melt into a graphite mold preheated to 200 ℃, and naturally cooling after solidification to obtain an ingot.
The metallurgical structure of the anti-scale alloy prepared by the process is a dendrite metallurgical structure, and a large amount of component differences exist between dendrites and branches of dendrites, so that the component segregation of the alloy in the metallurgical structure is caused, and the micro-battery system can be formed in a large amount in the anti-scale alloy when the segregation is caused, so that the anti-scale effect of the anti-scale alloy can be effectively improved. In addition, the effect of introducing aluminum into the components of the anti-scaling alloy in the scheme is that the electrode potential of aluminum is lower than the electrode potential of zinc in the traditional anti-scaling alloy of-1.660V, so that the micro battery system formed in the anti-scaling alloy containing aluminum has stronger electron release capacity than the anti-scaling alloy of the traditional zinc and lead system, and has extremely strong anti-scaling capacity improving effect.
It should be noted that, this experimental example is provided with 7 groups of experiments, and the scale preventing alloy blocks prepared in examples 1-7 are respectively hung in a simulated water sample, and blank control experiments are provided, and the control is an N80 steel hanging piece with the same size as the scale preventing alloy. The scale control alloy coupon and N80 coupon of examples 1-7 were placed into 14 beakers containing simulated water samples, and one beaker was taken to add only the stainless coupon as a control. The mass of the scale control alloy hanger and the N80 steel hanger of examples 1-7 was weighed before the experiment. And after the suspension time is 7 days and 7 days are finished, taking out the scale preventing alloy and the N80 steel hanging piece, and respectively testing the weights of the scale preventing alloy hanging piece and the stainless steel hanging piece at the end of the experiment to calculate the weight gain rate of the alloy, wherein the weight gain rate calculation formula is as follows:
Scale control= ((weight difference of N80 steel hanger of control group after end of experiment-weight difference of N80 steel hanger with scale control alloy hanger of examples 1-7 after end of experiment)/weight difference of N80 steel hanger of control group after end of experiment) ×100%
The simulated water quality used in this experiment is shown in the following table:
The experimental results are shown in the following table:
| Name of the name | Scale inhibition rate% |
| Example 1 fouling preventive alloy | 83.02 |
| Example 2 fouling preventive alloy | 94.58 |
| Example 3 fouling preventive alloy | 81.51 |
| Example 4 fouling preventive alloy | 85.62 |
| Example 5 fouling preventive alloy | 78.20 |
| EXAMPLE 6 Scale inhibitor alloy | 81.9 |
| Example 7 fouling resistant alloy | 88.7 |
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A zinc-free lead-free multi-element physical scale control alloy, characterized in that: the mass composition percentage of the multi-element physical scale prevention alloy material is as follows:
Cu 60.5～76.0wt.％；
Ni 18.0～25.0wt.％；
Co 2.0～5.0wt.％；
Fe 0.5～5.0wt.％；
AL 0.2～3.5wt.％。
2. A zinc-free lead-free multi-element physical antifouling alloy according to claim 1, wherein: the multi-element physical scale preventing alloy material is a dendrite metallographic structure.
3. A process for manufacturing a zinc-free lead-free multi-element physical scale control alloy, comprising the steps of:
S1: according to the content of Cu 60.5-75.0 wt%, ni 18.0-25.0 wt%, co 2.0-5.0 wt%, fe 0.5-5.0 wt%, al 0.2-3.5 wt%, pure copper, pure nickel, pure cobalt, pure iron powder and pure aluminum particles are weighed, and surface stains and oxide skin are removed.
S2: putting the pure copper and the pure nickel in the step S1 into a clean graphite crucible with a quartz protective sleeve, then putting the crucible together with the pure copper and the pure nickel therein onto a medium frequency induction furnace, starting the medium frequency induction furnace to heat and preheat the pure copper and the pure nickel in the crucible in the medium frequency induction furnace, wherein the preheating temperature is 150-250 ℃ and the preheating time is 10-20 min so as to remove water in the crucible; simultaneously placing pure cobalt, pure iron powder and pure aluminum into a baking oven at 150 ℃ for constant temperature for standby;
S3: heating the medium frequency induction furnace in the step S2 to 1200-1250 ℃ at a heating rate of 50 ℃/h, and adding charcoal covering agent in the smelting process to ensure that the surface of the smelted metal is covered by charcoal to isolate air; adding preheated iron powder when the pure copper and the pure nickel are completely melted and the temperature of the melt reaches 1200 ℃, keeping the temperature and standing for 3-5 min, adding preheated pure cobalt, keeping the temperature for 5-10 min, stirring for 1-2 min, turning off a power supply of an intermediate frequency induction furnace, adding aluminum after the temperature is reduced to 700 ℃, keeping the temperature for 10min, and stirring for 1-2 min again after the aluminum is completely melted; then the molten alloy is quickly heated to 1200-1250 ℃ within 30 minutes;
S4: and (3) when the temperature of the induction furnace reaches 1200-1250 ℃, closing the induction furnace for heating, taking out the scum on the surface of the melt, taking out the crucible, pouring the melt into a graphite mold preheated to 200 ℃, and naturally cooling after solidification to obtain an ingot.
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