CN111378302A - High-performance anti-electromagnetic wave interference normal-temperature cured phosphate anti-corrosion coating and preparation method thereof - Google Patents
High-performance anti-electromagnetic wave interference normal-temperature cured phosphate anti-corrosion coating and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating which is coated on the surface of metal and can effectively absorb electromagnetic waves. The raw materials comprise the following components: 25-30 parts of phosphate, 25-30 parts of alkaline modifier, 10-15 parts of silicate, 15-20 parts of electromagnetic wave absorbent precursor, 5-10 parts of carbonate, 3-5 parts of catalyst, 8-10 parts of thickener, 2-3 parts of retarder and 60-110 parts of water. The invention also discloses a preparation method of the high-performance anti-electromagnetic wave interference normal-temperature cured phosphate anticorrosive coating, which comprises the following steps: 1) preparing phosphate colloid; 2) blending to form a component A; 3) grinding the basic oxide; 4) blending to form a component B; 5) mixing the components A and B and stirring; 5) coating; 6) and (5) maintaining. The coating has the advantages of high corrosion resistance, effective absorption of external electromagnetic waves and good adhesive force.
Description
Technical Field
The invention belongs to the field of metal materials of steel structures, and particularly relates to a high-performance anti-electromagnetic wave interference normal-temperature cured phosphate anticorrosive coating and a preparation method thereof.
Background
Metals come into contact with the medium in the surrounding environment and undergo chemical reactions, which is the most common phenomenon of electrochemical corrosion of metals. As the metal surface is in contact with the surrounding medium (such as humid air, electrolyte solution, etc.), a metal anodic dissolution process occurs at the contact interface, while a corresponding cathodic process also exists, constituting a spontaneous corrosion cell, allowing the metal anodic dissolution to continue, thereby causing corrosion of the metal. According to investigation, the economic loss caused by global metal corrosion accounts for about 4 percent of the total amount of GDP every year, and the annual loss of metal corrosion far exceeds the sum of flood, fire, wind and earthquake losses. The corrosion not only causes economic loss, but also threatens the safety, and a plurality of catastrophic corrosion accidents occur at home and abroad.
People living or working in reinforced concrete structures in modern society face the hazards of invisible electromagnetic waves every day. When a human body is seriously radiated by electromagnetic waves, adverse reactions can occur, and the main symptoms are that people feel headache, vomit, alopecia accompanied with leucocyte reduction and general weakness can occur, and even people lose fertility.
In military technology, electronic devices for detecting targets using electromagnetic waves can emit electromagnetic waves to irradiate targets and receive echoes of the electromagnetic waves, so that information such as distances, distance change rates, directions, heights and the like from the targets to electromagnetic wave emission points can be obtained.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the normal temperature cured phosphate anticorrosive coating which is cured at normal temperature and used for a common building structure, can effectively absorb electromagnetic waves in the environment, and has high performance and electromagnetic wave interference resistance.
The technical scheme adopted by the invention for solving the technical problems is as follows: a high-performance normal temperature curing phosphate anti-corrosion coating resisting electromagnetic wave interference comprises the following components: 25-30 parts of phosphate, 25-30 parts of alkaline modifier, 10-15 parts of silicate, 15-20 parts of electromagnetic wave absorbent precursor, 5-10 parts of carbonate, 3-5 parts of catalyst, 8-10 parts of thickener, 2-3 parts of retarder and 60-110 parts of water; the electromagnetic wave absorber precursor reacts with the carbonate to form a protective layer for absorbing electromagnetic waves.
Preferably, the electromagnetic wave absorbent precursor is one or a combination of iron simple substance and ferric oxide.
Preferably, the carbonate is one or two of barium carbonate and strontium carbonate.
Preferably, the catalyst is one or more of hydrochloric acid, phosphoric acid, oxalic acid, sodium hydroxide and potassium hydroxide.
Preferably, the phosphate is one or more of potassium phosphate, potassium monohydrogen phosphate, potassium dihydrogen phosphate, sodium monohydrogen phosphate and sodium dihydrogen phosphate.
Preferably, the alkaline modifier is one or more of magnesium oxide, magnesium hydroxide, aluminum oxide, aluminum hydroxide, copper oxide, copper hydroxide, calcium oxide, calcium hydroxide, zirconium oxide, manganese dioxide, titanium dioxide, zinc dioxide, nickel monoxide, nickel sesquioxide, cobalt monoxide, cobaltous trioxide, barium oxide and strontium oxide. The metal elements in the alkaline modifier and the oxygen in the matrix coating form chemical connection, so that the density of the coating is improved; for example, the cobalt element and the nickel element can form chemical connection with oxygen in the base coating, so that the compactness of the coating is improved, and simultaneously can also perform chemical reaction with an oxide film on the surface of the base metal to form a cobalt-oxygen bond and a nickel-oxygen bond, so that the coating and the base metal form tighter adhesion.
Further, the zirconia is nano zirconia. The zirconium oxide, the aluminum oxide and the silicon dioxide are compounded, so that the performance parameters of the material can be greatly improved, the fracture toughness, the bending strength and the like of the material can be improved, and the flexural strength of the nano composite material can be obviously improved by the silane modified nano zirconium oxide particles.
Preferably, the silicate is any one or more of calcium silicate, potassium silicate, sodium silicate, magnesium silicate and aluminum silicate. The surface of the silicon oxide compound tightly adsorbs the catalyzed silicon oxide gel, and a three-dimensional network structure is formed after reaction, so that the density and the corrosion resistance of the coating are greatly improved. Preferably, the thickening agent is one or two of silicon dioxide and silica gel; the silicon dioxide is gas phase silicon dioxide, the particle size range of the spherical particles is 7-40nm, and the surfaces of the particles contain silanol groups. After the silicon oxide groups and the silicic acid groups on the surface of the thickening agent are dispersed in the coating, the silicon oxide groups and the silicic acid groups on the surface of the thickening agent are combined by hydrogen bonds between adjacent particles to generate loose lattices, a spatial three-dimensional network structure is formed, the gelling effect of the system can be endowed, and the viscosity of the coating system is increased. The silicon dioxide is gas phase silicon dioxide, the particle size of the spherical particles is 7-40nm, and the surfaces of the particles contain silanol groups. The gas phase silicon dioxide can improve the catalytic performance of the nano titanium dioxide.
Preferably, the retarder is one or more of sodium tetraborate, potassium tetraborate, sodium metaborate and potassium metaborate.
The invention also discloses a preparation method of the high-performance anti-electromagnetic wave interference normal-temperature cured phosphate anticorrosive coating, which comprises the following steps:
1) preparing phosphate colloid: mixing 25-30 parts of phosphate and 10-15 parts of silicate, adding 30-60 parts of water, uniformly stirring, and fully performing hydrolysis reaction;
2) material blending: adding 8-10 parts of thickening agent and 2-3 parts of retarder into the mixed material obtained in the step 1), and uniformly mixing to form a component A;
3) grinding: grinding 25-30 parts of alkaline modifier into powder, adding 15-20 parts of electromagnetic wave absorbent precursor, fully mixing and stirring, adding 5-10 parts of carbonate, and uniformly mixing;
4) material blending: adding 3-5 parts of catalyst into the mixed material obtained in the step 3), uniformly mixing, adding 30-50 parts of water, and stirring to form a component B;
5) stirring: stirring the component A obtained in the step 2) and the component B obtained in the step 4) to obtain the high-performance polyurethane adhesive.
Further, the temperature of the hydrolysis reaction in the step 1) is 15-25 ℃, and the reaction time is 0.4-1 h.
Further, the stirring speed in the step 5) is 300-400r/min, and the stirring time is 1-2 min.
In the invention, the electromagnetic wave absorbent precursor and carbonate have hydrolysis reaction and can generate complex physical change and chemical change with silicon oxide and phosphate, thereby forming the normal temperature curing modified phosphate inorganic anticorrosive coating. Because of the presence of the metal oxide, the raw material electromagnetic wave absorber forms a ferrite stably existing in the coating and is compounded with phosphate, and unlike a general metal magnetic material, the magnetic property of which is formed by the exchange of direct electron spins between adjacent magnetic atoms, the ferrite material has a relatively long distance between two magnetic ions and sandwiches oxygen ions, and in fact forms an exchange between ferromagnetic electron spins due to the presence of oxygen ions. When the electromagnetic wave passes through the coating, the ferrite with high magnetic conductivity can guide the electromagnetic wave, absorb the energy of the electromagnetic wave, and convert the energy into other forms of energy, such as heat energy, so as to achieve the purpose of absorbing the electromagnetic wave. The nano ferrite is wrapped by the silica compound particles, and after the nano ferrite is sprayed on the metal base material, micro-protrusions can be formed on the surface of the coating, so that the coating has the characteristic of high surface roughness, and when electromagnetic waves pass through the coating, the electromagnetic waves can be reflected for multiple times and pass through the ferrite on the surface of the coating, and the purpose of absorbing energy is achieved. The coating has the beneficial effects that as a large amount of ferrite exists in the coating, the coating has the capability of absorbing electromagnetic waves with wavelengths within a certain range, the coating can obviously lose the energy of the electromagnetic waves, can attenuate 8.5dB at a centimeter wave band, and can attenuate 24dB at 9 GHz; the attenuation reaches about 30dB at 5 GHz-10 GHz. The ferrite material is characterized by high coercive force, high magnetic energy product, good performance and low cost, and is suitable for large-area application and popularization. Tests prove that the hardness of the paint is stabilized between 80 and 90 (Shore hardness), the adhesive force of the coating is between 8 and 12MPa, and the paint completely meets the requirements of actual engineering.
The coating can be used for metal products such as iron plates, steel plates, reinforcing steel bars, various section steels, copper plates, aluminum plates and the like, and is applied to a plurality of fields such as civil buildings, military bases, airports, mechanical and chemical factories and the like.
Drawings
FIG. 1 is a photograph after coating and curing in example 1 of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A high-performance normal temperature curing phosphate anti-corrosion coating resisting electromagnetic wave interference comprises the following components: 30 parts of monopotassium phosphate, 20 parts of magnesium oxide, 5 parts of barium oxide, 2 parts of zinc dioxide, 2 parts of zirconium oxide, 5 parts of potassium silicate, 5 parts of sodium silicate, 5 parts of iron powder, 10 parts of iron oxide powder, 5 parts of barium carbonate, 5 parts of strontium carbonate, 2 parts of potassium hydroxide, 2 parts of sodium hydroxide, 8 parts of fumed silica (the particle size of spherical particles ranges from 7 nm to 40nm), 2 parts of silica gel, 2 parts of sodium tetraborate and 90 parts of water.
A preparation method of a high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating comprises the following steps:
1) preparing phosphate colloid: fully mixing and stirring 30 parts of monopotassium phosphate, 5 parts of potassium silicate and 5 parts of sodium silicate, adding 50 parts of water, uniformly stirring, and fully performing hydrolysis reaction at the temperature of 20 ℃ for 0.8 h;
2) material blending: adding 8 parts of fumed silica, 2 parts of silica gel and 2 parts of sodium tetraborate into the mixed material obtained in the step 1), and uniformly mixing to form a component A;
3) grinding: grinding 20 parts of magnesium oxide, 5 parts of barium oxide, 2 parts of zinc dioxide and 2 parts of zirconium oxide into powder, and uniformly mixing;
4) material blending: adding 5 parts of iron powder, 10 parts of iron oxide powder, 5 parts of barium carbonate, 5 parts of strontium carbonate, 2 parts of potassium hydroxide and 2 parts of sodium hydroxide into the mixed material obtained in the step 3), uniformly mixing, adding 40 parts of water, and stirring to form a component B;
5) stirring: stirring the component A obtained in the step 2) and the component B obtained in the step 4), and stirring for 1.5min at a stirring speed of 350r/min by using an electric paddle stirrer to obtain a high-performance anti-electromagnetic wave interference normal-temperature cured phosphate anticorrosive coating;
6) coating: coating the coating obtained in the step 5) on a metal substrate by adopting an electric airless sprayer, wherein the discharge pressure is 12MPa, the motor outputs 500W, 220V single phase and 50Hz to obtain a metal product with a normal-temperature cured phosphate anticorrosive coating which can resist electromagnetic wave interference with high performance;
7) and (5) maintenance: and (3) carrying out sodium chloride solution environmental curing on the metal product with the normal-temperature curing phosphate anticorrosive coating capable of resisting electromagnetic wave interference and having high performance obtained in the step 6).
Example 2
A high-performance normal temperature curing phosphate anti-corrosion coating resisting electromagnetic wave interference comprises the following components: 25 parts of sodium dihydrogen phosphate, 20 parts of magnesium oxide, 3 parts of barium oxide, 2 parts of zirconium oxide, 5 parts of potassium silicate, 5 parts of calcium silicate, 5 parts of iron powder, 10 parts of iron oxide powder, 5 parts of barium carbonate, 2 parts of potassium hydroxide, 2 parts of sodium hydroxide, 6 parts of fumed silica (the particle size of spherical particles ranges from 7 nm to 40nm), 2 parts of silica gel, 2 parts of potassium tetraborate and 60 parts of water.
A preparation method of a high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating comprises the following steps:
1) preparing phosphate colloid: fully mixing and stirring 25 parts of sodium dihydrogen phosphate, 5 parts of potassium silicate and 5 parts of calcium silicate, adding 30 parts of water, uniformly stirring, and fully performing hydrolysis reaction at the temperature of 25 ℃ for 1 hour;
2) material blending: adding 6 parts of phase silica, 2 parts of silica gel and 2 parts of potassium tetraborate into the mixed material obtained in the step 1), and uniformly mixing to form a component A;
3) grinding: grinding 20 parts of magnesium oxide, 3 parts of barium oxide and 2 parts of zirconium oxide into powder, and uniformly mixing;
4) material blending: adding 5 parts of iron powder, 5 parts of iron oxide powder, 5 parts of barium carbonate, 2 parts of potassium hydroxide and 2 parts of sodium hydroxide into the mixed material obtained in the step 3), uniformly mixing, adding 30 parts of water, and stirring to form a component B;
5) stirring: stirring the component A obtained in the step 2) and the component B obtained in the step 4), and stirring for 1min at a stirring speed of 300r/min by using an electric paddle stirrer to obtain a high-performance anti-electromagnetic wave interference normal-temperature cured phosphate anticorrosive coating;
6) coating: coating the coating obtained in the step 5) on a metal substrate by adopting an electric airless sprayer, wherein the discharge pressure is 12MPa, the motor outputs 500W, 220V single phase and 50Hz to obtain a metal product with a normal-temperature cured phosphate anticorrosive coating which can resist electromagnetic wave interference with high performance;
7) and (5) maintenance: and (3) carrying out sodium chloride solution environmental curing on the metal product with the normal-temperature curing phosphate anticorrosive coating capable of resisting electromagnetic wave interference and having high performance obtained in the step 6).
Example 3
A high-performance normal temperature curing phosphate anti-corrosion coating resisting electromagnetic wave interference comprises the following components: 10 parts of monopotassium phosphate, 20 parts of magnesium oxide, 5 parts of strontium oxide, 3 parts of magnesium hydroxide, 2 parts of zirconium oxide, 5 parts of potassium silicate, 5 parts of magnesium silicate, 5 parts of aluminum silicate, 10 parts of iron powder, 10 parts of iron oxide powder, 5 parts of strontium carbonate, 2 parts of potassium hydroxide, 2 parts of sodium hydroxide, 8 parts of fumed silica (the particle size of spherical particles ranges from 7 nm to 40nm), 2 parts of aluminum silicate, 1 part of potassium metaborate, 1 part of sodium metaborate and 110 parts of water.
A preparation method of a high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating comprises the following steps:
1) preparing phosphate colloid: fully mixing and stirring 10 parts of monopotassium phosphate, 20 parts of monopotassium phosphate, 5 parts of potassium silicate, 5 parts of magnesium silicate and 5 parts of aluminum silicate, adding 60 parts of water, uniformly stirring, and fully performing hydrolysis reaction at the temperature of 15 ℃ for 0.4 h;
2) material blending: adding 8 parts of fumed silica, 2 parts of aluminum silicate, 1 part of potassium metaborate and 1 part of sodium metaborate into the mixed material obtained in the step 1), and uniformly mixing to form a component A;
3) grinding: grinding 20 parts of magnesium oxide, 5 parts of strontium oxide, 3 parts of magnesium hydroxide and 2 parts of zirconium oxide into powder, and uniformly mixing;
4) material blending: adding 10 parts of iron powder, 10 parts of iron oxide powder, 5 parts of strontium carbonate, 2 parts of potassium hydroxide and 2 parts of sodium hydroxide into the mixed material obtained in the step 3), uniformly mixing, adding 50 parts of water, and stirring to form a component B;
5) stirring: stirring the component A obtained in the step 2) and the component B obtained in the step 4) for 2min at a stirring speed of 400r/min by using an electric blade stirrer to obtain a high-performance anti-electromagnetic wave interference normal-temperature cured phosphate anticorrosive coating;
6) coating: coating the coating obtained in the step 5) on a metal substrate by adopting an electric airless sprayer, wherein the discharge pressure is 12MPa, the motor outputs 500W, 220V single phase and 50Hz to obtain a metal product with a normal-temperature cured phosphate anticorrosive coating which can resist electromagnetic wave interference with high performance;
7) and (5) maintenance: and (3) carrying out sodium chloride solution environmental curing on the metal product with the normal-temperature curing phosphate anticorrosive coating capable of resisting electromagnetic wave interference and having high performance obtained in the step 6).
Example 4
A high-performance normal temperature curing phosphate anti-corrosion coating resisting electromagnetic wave interference comprises the following components: 10 parts of potassium phosphate, 15 parts of sodium phosphate, 10 parts of magnesium oxide, 5 parts of magnesium hydroxide, 5 parts of barium oxide, 5 parts of aluminum hydroxide, 2 parts of zirconium oxide, 5 parts of calcium silicate, 5 parts of magnesium silicate, 5 parts of aluminum silicate, 10 parts of iron powder, 5 parts of iron oxide powder, 5 parts of barium carbonate, 5 parts of strontium carbonate, 2 parts of hydrochloric acid, 2 parts of phosphoric acid, 8 parts of fumed silica (the particle size of spherical particles is 7-40nm), 2 parts of silica gel, 1 part of sodium tetraborate, 1 part of potassium metaborate, 1 part of sodium metaborate and 100 parts of water.
A preparation method of a high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating comprises the following steps:
1) preparing phosphate colloid: fully mixing and stirring 10 parts of potassium phosphate, 15 parts of sodium phosphate, 5 parts of magnesium silicate and 5 parts of aluminum silicate, adding 50 parts of water, uniformly stirring, and fully performing hydrolysis reaction at the temperature of 18 ℃ for 0.6 h;
2) material blending: adding 8 parts of fumed silica, 2 parts of silica gel, 1 part of sodium tetraborate, 1 part of potassium metaborate and 1 part of sodium metaborate into the mixed material obtained in the step 1), and uniformly mixing to form a component A;
3) grinding: grinding 5 parts of magnesium oxide, 5 parts of magnesium hydroxide, 5 parts of barium oxide, 5 parts of aluminum hydroxide and 2 parts of zirconium oxide into powder, and uniformly mixing;
4) material blending: adding 10 parts of iron powder, 5 parts of iron oxide powder, 5 parts of barium carbonate, 5 parts of strontium carbonate, 2 parts of hydrochloric acid and 2 parts of phosphoric acid into the mixed material obtained in the step 3), uniformly mixing, adding 50 parts of water, and stirring to form a component B;
5) stirring: stirring the component A obtained in the step 2) and the component B obtained in the step 4), and stirring for 1.5min at a stirring speed of 400r/min by using an electric blade stirrer to obtain a high-performance anti-electromagnetic wave interference normal-temperature cured phosphate anticorrosive coating;
6) coating: coating the coating obtained in the step 5) on a metal substrate by adopting an electric airless sprayer, wherein the discharge pressure is 12MPa, the motor outputs 500W, 220V single phase and 50Hz to obtain a metal product with a normal-temperature cured phosphate anticorrosive coating which can resist electromagnetic wave interference with high performance;
7) and (5) maintenance: and (3) carrying out sodium chloride solution environmental curing on the metal product with the normal-temperature curing phosphate anticorrosive coating capable of resisting electromagnetic wave interference and having high performance obtained in the step 6).
Example 5
A high-performance normal temperature curing phosphate anti-corrosion coating resisting electromagnetic wave interference comprises the following components: 10 parts of sodium monohydrogen phosphate, 20 parts of sodium dihydrogen phosphate, 10 parts of magnesium oxide, 5 parts of barium oxide, 5 parts of calcium oxide, 2 parts of zirconium oxide, 2 parts of cobalt monoxide, 2 parts of nickel monoxide, 5 parts of potassium silicate, 5 parts of sodium silicate, 5 parts of aluminum silicate, 5 parts of iron powder, 10 parts of iron oxide powder, 5 parts of barium carbonate, 2 parts of phosphoric acid, 2 parts of oxalic acid, 8 parts of fumed silica (the particle size range of spherical particles is 7-40nm), 2 parts of silica gel, 3 parts of sodium tetraborate and 80 parts of water.
A preparation method of a high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating comprises the following steps:
1) preparing phosphate colloid: fully mixing and stirring 10 parts of sodium monohydrogen phosphate, 20 parts of sodium dihydrogen phosphate, 5 parts of potassium silicate, 5 parts of sodium silicate and 5 parts of aluminum silicate, adding 45 parts of water, uniformly stirring, and fully performing hydrolysis reaction at the hydrolysis reaction temperature of 22 ℃ for 0.8 h;
2) material blending: adding 8 parts of fumed silica, 2 parts of silica gel and 2 parts of sodium tetraborate into the mixed material obtained in the step 1), and uniformly mixing to form a component A;
3) grinding: grinding 10 parts of magnesium oxide, 5 parts of barium oxide, 5 parts of calcium oxide, 2 parts of zirconium oxide, 2 parts of cobalt monoxide and 2 parts of nickel monoxide into powder, and uniformly mixing;
4) material blending: adding 5 parts of iron powder, 10 parts of iron oxide powder, 5 parts of barium carbonate, 2 parts of phosphoric acid and 2 parts of oxalic acid into the mixed material obtained in the step 3), uniformly mixing, and then adding 35 parts of water and stirring to form a component B;
5) stirring: stirring the component A obtained in the step 2) and the component B obtained in the step 4), and stirring for 1.5min at a stirring speed of 300r/min by using an electric paddle stirrer to obtain a high-performance anti-electromagnetic wave interference normal-temperature cured phosphate anticorrosive coating;
6) coating: coating the coating obtained in the step 5) on a metal substrate by adopting an electric airless sprayer, wherein the discharge pressure is 12MPa, the motor outputs 500W, 220V single phase and 50Hz to obtain a metal product with a normal-temperature cured phosphate anticorrosive coating which can resist electromagnetic wave interference with high performance;
7) and (5) maintenance: and (3) carrying out sodium chloride solution environmental curing on the metal product with the normal-temperature curing phosphate anticorrosive coating capable of resisting electromagnetic wave interference and having high performance obtained in the step 6).
Example 6
A high-performance normal temperature curing phosphate anti-corrosion coating resisting electromagnetic wave interference comprises the following components: 5 parts of potassium phosphate, 5 parts of monopotassium phosphate, 5 parts of sodium monohydrogen phosphate, 5 parts of sodium dihydrogen phosphate, 10 parts of aluminum oxide, 5 parts of strontium oxide, 3 parts of manganese dioxide, 3 parts of zinc dioxide, 2 parts of zirconium oxide, 2 parts of nickel monoxide, 2 parts of cobalt monoxide, 5 parts of potassium silicate, 5 parts of magnesium silicate, 5 parts of calcium silicate, 5 parts of iron powder, 10 parts of iron oxide powder, 5 parts of strontium carbonate, 2 parts of hydrochloric acid, 2 parts of oxalic acid, 8 parts of fumed silica (the particle size of spherical particles ranges from 7 nm to 40nm), 2 parts of silica gel, 1 part of potassium metaborate, 1 part of sodium metaborate and 70 parts of water.
A preparation method of a high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating comprises the following steps:
1) preparing phosphate colloid: fully mixing and stirring 5 parts of potassium phosphate, 5 parts of monopotassium phosphate, 5 parts of sodium monohydrogen phosphate, 5 parts of sodium dihydrogen phosphate, 5 parts of potassium silicate, 5 parts of magnesium silicate and 5 parts of calcium silicate, adding 40 parts of water, uniformly stirring, fully performing hydrolysis reaction at the temperature of 25 ℃ for 1 hour;
2) material blending: adding 8 parts of fumed silica, 2 parts of silica gel, 1 part of potassium metaborate and 1 part of sodium metaborate into the mixed material obtained in the step 1), and uniformly mixing to form a component A;
3) grinding: grinding 5 parts of aluminum oxide, 5 parts of strontium oxide, 3 parts of manganese dioxide, 3 parts of zinc dioxide, 2 parts of zirconium oxide, 2 parts of nickel monoxide and 2 parts of cobalt monoxide into powder, and uniformly mixing;
4) material blending: adding 5 parts of iron powder, 10 parts of iron oxide powder, 5 parts of strontium carbonate, 2 parts of hydrochloric acid and 2 parts of oxalic acid into the mixed material obtained in the step 3), uniformly mixing, and then adding 30 parts of water and stirring to form a component B;
5) stirring: stirring the component A obtained in the step 2) and the component B obtained in the step 4), and stirring for 1min at a stirring speed of 400r/min by using an electric blade stirrer to obtain a high-performance anti-electromagnetic wave interference normal-temperature cured phosphate anticorrosive coating;
6) coating: coating the coating obtained in the step 5) on a metal substrate by adopting an electric airless sprayer, wherein the discharge pressure is 12MPa, the motor outputs 500W, 220V single phase and 50Hz to obtain a metal product with a normal-temperature cured phosphate anticorrosive coating which can resist electromagnetic wave interference with high performance;
7) and (5) maintenance: and (3) carrying out sodium chloride solution environmental curing on the metal product with the normal-temperature curing phosphate anticorrosive coating capable of resisting electromagnetic wave interference and having high performance obtained in the step 6).
Comparative example 1
A high-performance normal temperature curing phosphate anti-corrosion coating resisting electromagnetic wave interference comprises the following components: 30 parts of monopotassium phosphate, 20 parts of magnesium oxide, 5 parts of barium oxide, 2 parts of zinc dioxide, 2 parts of zirconium oxide, 5 parts of potassium silicate, 5 parts of sodium silicate, 5 parts of iron powder, 10 parts of iron oxide powder, 5 parts of barium carbonate, 5 parts of strontium carbonate, 8 parts of fumed silica (the particle size of spherical particles ranges from 7 nm to 40nm), 2 parts of silica gel, 2 parts of sodium tetraborate and 90 parts of water.
A preparation method of a high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating comprises the following steps:
1) preparing phosphate colloid: fully mixing and stirring 30 parts of monopotassium phosphate, 5 parts of potassium silicate and 5 parts of sodium silicate, adding 50 parts of water, uniformly stirring, and fully performing hydrolysis reaction at the temperature of 20 ℃ for 0.8 h;
2) material blending: adding 8 parts of fumed silica, 2 parts of silica gel and 2 parts of sodium tetraborate into the mixed material obtained in the step 1), and uniformly mixing to form a component A;
3) grinding: grinding 20 parts of magnesium oxide, 5 parts of barium oxide, 2 parts of zinc dioxide and 2 parts of zirconium oxide into powder, and uniformly mixing;
4) material blending: adding 5 parts of iron powder, 10 parts of iron oxide powder, 5 parts of barium carbonate and 5 parts of strontium carbonate into the mixed material obtained in the step 3), uniformly mixing, adding 40 parts of water, and stirring to form a component B;
5) stirring: stirring the component A obtained in the step 2) and the component B obtained in the step 4), and stirring for 1.5min at a stirring speed of 350r/min by using an electric paddle stirrer to obtain a high-performance anti-electromagnetic wave interference normal-temperature cured phosphate anticorrosive coating;
6) coating: coating the coating obtained in the step 5) on a metal substrate by adopting an electric airless sprayer, wherein the discharge pressure is 12MPa, the motor outputs 500W, 220V single phase and 50Hz to obtain a metal product with a normal-temperature cured phosphate anticorrosive coating which can resist electromagnetic wave interference with high performance;
7) and (5) maintenance: and (3) carrying out sodium chloride solution environmental curing on the metal product with the normal-temperature curing phosphate anticorrosive coating capable of resisting electromagnetic wave interference and having high performance obtained in the step 6).
Comparative example 2
A high-performance normal temperature curing phosphate anti-corrosion coating resisting electromagnetic wave interference comprises the following components: 30 parts of monopotassium phosphate, 20 parts of magnesium oxide, 5 parts of barium oxide, 2 parts of zinc dioxide, 2 parts of zirconium oxide, 5 parts of potassium silicate, 5 parts of sodium silicate, 5 parts of iron powder, 10 parts of iron oxide powder, 2 parts of phosphoric acid, 2 parts of hydrochloric acid, 8 parts of fumed silica (the particle size of spherical particles ranges from 7 nm to 40nm), 2 parts of silica gel, 2 parts of sodium tetraborate and 90 parts of water.
A preparation method of a high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating comprises the following steps:
1) preparing phosphate colloid: fully mixing and stirring 30 parts of monopotassium phosphate, 5 parts of potassium silicate and 5 parts of sodium silicate, adding 50 parts of water, uniformly stirring, and fully performing hydrolysis reaction at the temperature of 20 ℃ for 0.8 h;
2) material blending: adding 8 parts of fumed silica, 2 parts of silica gel and 2 parts of sodium tetraborate into the mixed material obtained in the step 1), and uniformly mixing to form a component A;
3) grinding: grinding 20 parts of magnesium oxide, 5 parts of barium oxide, 2 parts of zinc dioxide and 2 parts of zirconium oxide into powder, and uniformly mixing;
4) material blending: adding 5 parts of iron powder, 10 parts of iron oxide powder, 2 parts of phosphoric acid and 2 parts of hydrochloric acid into the mixed material obtained in the step 3), uniformly mixing, adding 40 parts of water, and stirring to form a component B;
5) stirring: stirring the component A obtained in the step 2) and the component B obtained in the step 4), and stirring for 1.5min at a stirring speed of 350r/min by using an electric paddle stirrer to obtain a high-performance anti-electromagnetic wave interference normal-temperature cured phosphate anticorrosive coating;
6) coating: coating the coating obtained in the step 5) on a metal substrate by adopting an electric airless sprayer, wherein the discharge pressure is 12MPa, the motor outputs 500W, 220V single phase and 50Hz to obtain a metal product with a normal-temperature cured phosphate anticorrosive coating which can resist electromagnetic wave interference with high performance;
7) and (5) maintenance: and (3) carrying out sodium chloride solution environmental curing on the metal product with the normal-temperature curing phosphate anticorrosive coating capable of resisting electromagnetic wave interference and having high performance obtained in the step 6).
Comparative example 3
A high-performance normal temperature curing phosphate anti-corrosion coating resisting electromagnetic wave interference comprises the following components: 30 parts of monopotassium phosphate, 20 parts of magnesium oxide, 5 parts of barium oxide, 2 parts of zinc dioxide, 2 parts of zirconium oxide, 5 parts of potassium silicate, 5 parts of sodium silicate, 5 parts of iron powder, 10 parts of iron oxide powder, 8 parts of fumed silica (the particle size of spherical particles ranges from 7 nm to 40nm), 2 parts of silica gel, 2 parts of sodium tetraborate and 90 parts of water.
A preparation method of a high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating comprises the following steps:
1) preparing phosphate colloid: fully mixing and stirring 30 parts of monopotassium phosphate, 5 parts of potassium silicate and 5 parts of sodium silicate, adding 50 parts of water, uniformly stirring, and fully performing hydrolysis reaction at the temperature of 20 ℃ for 0.8 h;
2) material blending: adding 8 parts of fumed silica, 2 parts of silica gel and 2 parts of sodium tetraborate into the mixed material obtained in the step 1), and uniformly mixing to form a component A;
3) grinding: grinding 20 parts of magnesium oxide, 5 parts of barium oxide, 2 parts of zinc dioxide and 2 parts of zirconium oxide into powder, and uniformly mixing;
4) material blending: adding 5 parts of iron powder and 10 parts of iron oxide powder into the mixed material obtained in the step 3), uniformly mixing, adding 40 parts of water, and stirring to form a component B;
5) stirring: stirring the component A obtained in the step 2) and the component B obtained in the step 4), and stirring for 1.5min at a stirring speed of 350r/min by using an electric paddle stirrer to obtain a high-performance anti-electromagnetic wave interference normal-temperature cured phosphate anticorrosive coating;
6) coating: coating the coating obtained in the step 5) on a metal substrate by adopting an electric airless sprayer, wherein the discharge pressure is 12MPa, the motor outputs 500W, 220V single phase and 50Hz to obtain a metal product with a normal-temperature cured phosphate anticorrosive coating which can resist electromagnetic wave interference with high performance;
7) and (5) maintenance: and (3) carrying out sodium chloride solution environmental curing on the metal product with the normal-temperature curing phosphate anticorrosive coating capable of resisting electromagnetic wave interference and having high performance obtained in the step 6).
In order to verify the effectiveness of the coating and coating method for the corrosion protection of steel according to the present invention, the following tests were carried out:
1) electromagnetic wave absorption experiment
Nine groups of coated steel sheets of examples 1 to 6 and comparative examples 1 to 3, each of which was composed of 3 replicates, were selected, and the conditions of absorption of ambient electromagnetic waves by the coated steel sheets were measured according to the requirements of the specification GBZ/T189.2-2007 and evaluated according to the sanitation standard for ambient electromagnetic waves specified in GB 8702-2014. The experiment used a 9GHz frequency wave source.
TABLE 2 electromagnetic wave absorption test
From the results of the electromagnetic wave absorption experiments, the electromagnetic wave intensity attenuation ranges of examples 1 to 6 are 31 to 35dB, and it can be seen that the industrial requirements are satisfied, and the electromagnetic wave intensity attenuation ranges of comparative examples 1 to 3 are about 3 to 7dB, which are much lower than those of examples 1 to 6.
2) Coating adhesion test
During the test, a pull-off test is carried out according to the standard of GB/T5210-2006 adhesion test by a color paint and varnish pull-open method. The diameter of the test column is 20 mm, and double-component epoxy resin glue is adopted. The average of the results of each set of three samples is shown in Table 2.
The control group had no anti-electromagnetic wave related admixtures, i.e. no electromagnetic wave absorber precursor, carbonate, catalyst. It can be seen from the table that the resulting ferrite also has improved adhesion and hardness to the coating of the present invention, and the ferrite forms a denser bond at the bonding portion of the coating and the substrate. The adhesion and hardness of the coating of the invention are sufficient to meet the practical engineering requirements.
3) Example of coating
FIG. 1 is a photograph of comparative example 1 after coating and curing, which is similar to examples 2 and 3 and is represented by 1. As can be seen from the figure, the coated surface had a rough feel.
Claims (10)
1. A high-performance normal temperature curing phosphate anti-corrosion coating resisting electromagnetic wave interference is characterized by comprising the following components: 25-30 parts of phosphate, 25-30 parts of alkaline modifier, 10-15 parts of silicate, 15-20 parts of electromagnetic wave absorbent precursor, 5-10 parts of carbonate, 3-5 parts of catalyst, 8-10 parts of thickener, 2-3 parts of retarder and 60-110 parts of water; the electromagnetic wave absorber precursor reacts with the carbonate to form a protective layer for absorbing electromagnetic waves.
2. The high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating according to claim 1, which is characterized in that: the precursor of the electromagnetic wave absorbent is one or the combination of two of iron simple substance or ferric oxide.
3. The high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating according to claim 1, which is characterized in that: the carbonate is one or two of barium carbonate and strontium carbonate; the catalyst is one or more of hydrochloric acid, phosphoric acid, oxalic acid, sodium hydroxide and potassium hydroxide.
4. The high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating according to claim 1, which is characterized in that: the phosphate is one or more of potassium phosphate, potassium monohydrogen phosphate, potassium dihydrogen phosphate, sodium monohydrogen phosphate and sodium dihydrogen phosphate.
5. The high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating according to claim 1, which is characterized in that: the alkaline modifier is one or more of magnesium oxide, magnesium hydroxide, aluminum oxide, aluminum hydroxide, copper oxide, copper hydroxide, calcium oxide, calcium hydroxide, zirconium oxide, manganese dioxide, titanium dioxide, zinc dioxide, nickel monoxide, nickel sesquioxide, cobalt monoxide, cobalt sesquioxide, barium oxide and strontium oxide; the zirconia is nano zirconia.
6. The high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating according to claim 1, which is characterized in that: the silicate is one or more of calcium silicate, potassium silicate, sodium silicate, magnesium silicate and aluminum silicate.
7. The high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating according to claim 1, which is characterized in that: the thickening agent is one or two of silicon dioxide and silica gel; the silicon dioxide is gas phase silicon dioxide, the particle size range of the spherical particles is 7-40nm, and the surfaces of the particles contain silanol groups.
8. The high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating according to claim 1, which is characterized in that: the retarder is one or more of sodium tetraborate, potassium tetraborate, sodium metaborate and potassium metaborate.
9. A preparation method of a high-performance anti-electromagnetic wave interference normal temperature curing phosphate anti-corrosion coating comprises the following steps:
1) preparing phosphate colloid: adding 30-60 parts of water into 25-30 parts of phosphate and 10-15 parts of silicate as raw materials, uniformly stirring, and carrying out full hydrolysis reaction;
2) material blending: adding 8-10 parts of thickening agent and 2-3 parts of retarder into the mixed material obtained in the step 1), and uniformly mixing to form a component A;
3) grinding: grinding 25-30 parts of alkaline modifier into powder, adding 10-15 parts of electromagnetic wave absorbent precursor, fully mixing and stirring, adding 10-15 parts of carbonate, and uniformly mixing;
4) material blending: adding 3-5 parts of catalyst into the mixed material obtained in the step 3), uniformly mixing, adding 30-50 parts of catalyst, and stirring to form a component B;
5) stirring: stirring the mixed component A obtained in the step 2) and the component B obtained in the step 4) to obtain the composite material.
10. The preparation method of the high-performance anti-electromagnetic wave interference room temperature curing phosphate anti-corrosion coating according to claim 8, characterized in that: the temperature of the hydrolysis reaction in the step 1) is 15-25 ℃, and the reaction time is 0.4-1 h; the stirring speed in the step 5) is 300-400r/min, and the stirring time is 1-2 min.
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| CN116815188A (en) * | 2023-07-21 | 2023-09-29 | 深圳大学 | Corrosion inhibitor, preparation method thereof and corrosion inhibition component |
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Cited By (2)
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| CN116815188A (en) * | 2023-07-21 | 2023-09-29 | 深圳大学 | Corrosion inhibitor, preparation method thereof and corrosion inhibition component |
| CN116815188B (en) * | 2023-07-21 | 2024-05-28 | 深圳大学 | Corrosion inhibitor, preparation method thereof and corrosion inhibition component |
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