Disclosure of Invention
The invention aims to provide an ocean steel anticorrosion paste and a preparation method thereof, and solves the following technical problems:
the corrosion-resistant paste falls off after being used for a long time in the marine environment, so that the corrosion-resistant effect of the corrosion-resistant paste is gradually lost.
The purpose of the invention can be realized by the following technical scheme:
the marine steel corrosion-resistant paste comprises the following components in parts by weight: 35-45 parts of base oil, 10-14 parts of oily anticorrosive agent, 20-50 parts of modified alumina solution and 0.5-2 parts of calcium oxide.
As a further scheme of the invention: the base oil is white oil.
As a further scheme of the invention: the oily anticorrosive agent is one or more of oil calcium sulfonate, dodecenyl succinic acid or aluminum distearate.
As a further scheme of the invention: the modified alumina is prepared by the following steps:
a1. calcining alumina with particle size of 0.1-1.5 μm at 800-1200 deg.C for 8-16h;
a2. placing the calcined alumina powder into a dispersion system consisting of tetrahydrofuran or acetone, adding a silane coupling agent containing an aliphatic chain into the dispersion system, refluxing for 2-4h at 70-80 ℃, cooling, fully mixing uniformly, and cooling to obtain a modified alumina solution.
As a further scheme of the invention: the silane coupling agent containing the aliphatic chain is octyl triethoxysilane.
As a further scheme of the invention: the preparation method of the marine steel corrosion-resistant paste comprises the following steps:
s1, weighing the raw materials in parts by weight, mixing and stirring the base oil, the oily anticorrosive agent and the modified alumina solution uniformly, and then placing the mixture in a reaction kettle to heat for 30-75min to obtain slurry;
s2, blending the reacted slurry and calcium oxide in a carbon dioxide-free atmosphere, gradually adding calcium oxide powder, continuously stirring and maintaining the temperature to be not higher than 60 ℃, steaming at a low temperature to remove water in a mixed system after the reaction is finished, and uniformly stirring again to obtain the marine steel corrosion-resistant paste.
As a further scheme of the invention: the heating temperature in the step S1 is 70-90 ℃.
The invention has the beneficial effects that:
(1) In the technical scheme of the invention, the base oil, the oily corrosion inhibitor, the modified alumina solution and the calcium oxide are contained in the base oil, and the effect of prolonging the long-term strength of the corrosion-resistant paste can be achieved through the synergistic effect of the substances.
(2) The anti-corrosion paste adopted by the invention adopts the silane coupling agent containing the aliphatic chain in the process of preparing the modified alumina, so that the full mixing of the modified alumina and the anti-corrosion paste system can be effectively improved, and particularly, the oily anti-corrosion paste material can be well combined with the modified alumina, thereby improving the comprehensive strength and the anti-corrosion effect of the anti-corrosion paste.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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
The marine steel corrosion-resistant paste comprises the following components in parts by weight: 35 parts of white oil, 14 parts of calcium oil sulfonate, 20 parts of modified alumina solution and 2 parts of calcium oxide.
The modified alumina is prepared by the following steps:
a1. calcining alumina with the particle size of 0.1 mu m at 1200 ℃ for 8h;
a2. placing the calcined alumina powder into a dispersion system consisting of tetrahydrofuran or acetone, adding octyl triethoxysilane into the dispersion system, refluxing for 2h at 80 ℃, cooling, fully mixing uniformly, and cooling to obtain a modified alumina solution.
The preparation method of the marine steel corrosion-resistant paste comprises the following steps:
s1, weighing the raw materials in parts by weight, mixing and stirring white oil, calcium sulfonate oil and a modified alumina solution uniformly, and then placing the mixture in a reaction kettle to heat at 90 ℃ for 30min to obtain slurry;
s2, blending the reacted slurry and calcium oxide in a carbon dioxide-free atmosphere, gradually adding calcium oxide powder, continuously stirring and maintaining the temperature to be not higher than 60 ℃, steaming at a low temperature after the reaction is finished, removing water in a mixed system, and uniformly stirring again to obtain the marine steel corrosion-resistant paste.
Example 2
The marine steel corrosion-resistant paste comprises the following components in parts by weight: 45 parts of white oil, 10 parts of dodecenyl succinic acid, 50 parts of modified alumina solution and 0.5 part of calcium oxide.
The modified alumina is prepared by the following steps:
a1. calcining alumina with the particle size of 1.5 mu m at 800 ℃ for 16h;
a2. placing the calcined alumina powder into a dispersion system consisting of tetrahydrofuran or acetone, adding octyl triethoxysilane into the dispersion system, refluxing for 4h at 70 ℃, cooling, fully mixing uniformly, and cooling to obtain a modified alumina solution.
The preparation method of the marine steel corrosion-resistant paste comprises the following steps:
s1, weighing the raw materials in parts by weight, mixing and stirring white oil, dodecenylsuccinic acid and a modified alumina solution uniformly, and then placing the mixture in a reaction kettle to heat at 90 ℃ for 30min to obtain slurry;
s2, blending the reacted slurry and calcium oxide in a carbon dioxide-free atmosphere, gradually adding calcium oxide powder, continuously stirring and maintaining the temperature to be not higher than 60 ℃, steaming at a low temperature after the reaction is finished, removing water in a mixed system, and uniformly stirring again to obtain the marine steel corrosion-resistant paste.
Example 3
The marine steel corrosion-resistant paste comprises the following components in parts by weight: 35-45 parts of white oil, 12 parts of aluminum distearate, 35 parts of modified alumina solution and 1 part of calcium oxide.
The modified alumina is prepared by the following steps:
a1. calcining alumina with the particle size of 0.5 mu m at 1000 ℃ for 12h;
a2. placing the calcined alumina powder into a dispersion system consisting of tetrahydrofuran or acetone, adding octyl triethoxysilane into the dispersion system, refluxing for 3h at 75 ℃, cooling, fully mixing uniformly, and cooling to obtain a modified alumina solution.
The preparation method of the marine steel corrosion-resistant paste comprises the following steps:
s1, weighing the raw materials in parts by weight, uniformly mixing and stirring white oil, aluminum distearate and a modified alumina solution, and then placing the mixture in a reaction kettle to heat at 80 ℃ for 50min to obtain slurry;
s2, blending the reacted slurry and calcium oxide in a carbon dioxide-free atmosphere, gradually adding calcium oxide powder, continuously stirring and maintaining the temperature to be not higher than 60 ℃, steaming at a low temperature to remove water in a mixed system after the reaction is finished, and uniformly stirring again to obtain the marine steel corrosion-resistant paste.
Comparative example 1
This comparative example differs from example 2 in that the modified alumina is replaced by alumina.
Comparative example 2
This comparative example differs from example 2 in that no calcium oxide was added.
Comparative example 3
The comparative example differs from example 2 in that the system is ventilated with air during the preparation of the anti-corrosive paste.
Test examples
The corrosion-resistant pastes of all the embodiments and the comparative examples are prepared and the actual effects are verified through experiments, the experimental method refers to the test data of the salt water resistance test in the appendix E of GB/T32119 and the long-term steel protection effect in the salt water test, wherein the long-term steel protection effect is calculated through the steel weight loss rate, after the steel coated with the corrosion-resistant paste of 2mm is soaked in salt water for a certain time, the corrosion-resistant paste is removed, the surface corrosion is removed by adopting dilute acetic acid, the weight change of the steel before and after the test is compared, namely the data is the ratio of the steel part subjected to corrosion to the total steel mass, and the steel used in the experimental example is Q370qE steel.
As can be seen from the above table, the difference between example 2 and comparative example 1 is whether the alumina is modified, and since the modified alumina is adopted in example 2, the steel loss caused by long-term corrosion of the steel is reduced, and the corrosion of the steel surface is effectively prevented; compared with the comparative example 2, the difference of the example 2 is that whether calcium oxide is added or not, and the calcium oxide is contained in the example 2, so that the steel loss caused by long-term corrosion of the steel is reduced, and the corrosion of the surface of the steel is effectively prevented; the difference between the embodiment 2 and the comparative example 3 lies in whether the preparation process of the corrosion inhibitor is carried out in the environment containing carbon dioxide, the embodiment 2 still contains a large amount of calcium hydroxide before coating because the carbon dioxide is isolated, the substance gradually contacts with the carbon dioxide in the air after coating, so that a hardened surface layer is formed, the corrosion of salt water to the coating is delayed, the calcium hydroxide can play thickening and shaping effects in the preparation and coating processes of the corrosion inhibitor, the coating effect can be improved, and the corrosion inhibitor containing calcium carbonate not only cannot play a thickening effect, but also is easy to separate from other components of the corrosion inhibitor because the calcium hydroxide is a solid phase substance, so that the storage capacity of the corrosion inhibitor is reduced.
Although one embodiment of the present invention has been described in detail, the description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.