Paint and coating for promoting titanium or titanium alloy to form titanium hydride as well as preparation method and application of paint and coating

Abstract

The invention provides paint for promoting titanium or titanium alloy to form titanium hydride, a coating and a preparation method and application thereof, and belongs to the technical field of paint. The coating for promoting the titanium or the titanium alloy to form the titanium hydride comprises the following raw materials: an electrocatalyst, a solvent and a binder, the electrocatalyst is prepared from Ni3S2, Ni3N or Mo2C. The electrocatalyst Ni3S2, Ni3N or Mo2C has the property that hydrogen atoms can be easily adsorbed and difficultly desorbed, and the hydrogen atoms can be easily adsorbed to the surface of the coating during hydrogen charging, so that the concentration gradient of the hydrogen atoms on the surface of the coating is greatly increased, the permeation driving force of the hydrogen atoms is increased, more hydrogen atoms are promoted to enter titanium or titanium alloy, and the surface of the titanium or titanium alloy is protected. And then the titanium or the titanium alloy is converted into the titanium hydride.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and particularly relates to a coating, a coating layer for promoting the formation of titanium hydride on titanium or titanium alloy, and a preparation method and application thereof. Background Art

[0002] Due to their stable and excellent physical and chemical properties, titanium and titanium alloys have been widely used in the fields of aerospace, chemical engineering, and petrochemical industry. However, in extreme acid / alkali environments or hydrogen-containing environments, titanium hydride (TiH

[0004] , , 0 < x ≤ 2) will form on the surface of titanium and titanium alloys, resulting in a decrease in their mechanical properties and corrosion resistance, and further reducing the comprehensive service performance of titanium and titanium alloys. Therefore, researchers have carried out research on TiH x in order to clarify the formation process of titanium hydride on titanium and titanium alloys and its influence on performance. Laboratory research is very important. In the laboratory, the formation of titanium hydride on the surface of titanium and titanium alloys is mainly through electrochemical hydrogen charging. During the electrochemical hydrogen charging process, hydrogen atoms reach the surface of titanium and titanium alloys under the action of electrochemical potential / current. After being adsorbed on the surface, they penetrate, diffuse, and dissolve into the matrix. When supersaturated in the matrix, H reacts with Ti to form TiH x .

[0003] Generally, during the electrochemical hydrogen charging process of titanium or titanium alloy, parameters such as external H concentration, temperature, hydrogen charging current, or hydrogen charging time need to be determined, and the growth stage of titanium hydride is characterized by morphology, phase, or thickness. If the electrochemical hydrogen charging efficiency needs to be improved under the condition that the external conditions remain unchanged, that is, on the premise that the diffusion rate and solubility of H in the matrix of titanium and titanium alloys are basically unchanged, and more hydrogen atoms enter the metal matrix per unit time, then the H adsorption amount on the surface of the titanium or titanium alloy matrix needs to be increased, the H concentration gradient from the surface to the core is increased, and the penetration driving force is increased, so as to increase the H penetration amount to form more TiH x . Therefore, covering a layer of coating that is easy to adsorb H and through which H can easily penetrate on the surface of titanium or titanium alloy can achieve the above purpose. However, coating the surface of a metal matrix with a coating related to hydrogen atoms usually refers to a hydrogen-blocking coating, whose main purpose is to prevent hydrogen atoms from entering the metal matrix, prevent or delay the formation of titanium hydride and the occurrence of hydrogen damage. There is no report on a coating that promotes hydrogen atoms to penetrate into the metal matrix to form titanium hydride. Therefore, how to promote the formation of titanium hydride on titanium or titanium alloy during the electrochemical hydrogen charging process has become an urgent technical problem in this field. Summary of the Invention

[0004] The purpose of the present invention is to provide a coating, a coating layer for promoting the formation of titanium hydride on titanium or titanium alloy, and a preparation method and application thereof. The coating provided by the present invention can promote the formation of titanium hydride on titanium or titanium alloy.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a coating for promoting titanium or titanium alloy to form titanium hydride, the raw materials of which include an electrocatalyst, a solvent and a binder;

[0007] The electrocatalyst includes Ni3S2, Ni3N or Mo2C.

[0008] Preferably, the electrocatalyst is nano-scale; the particle size of the electrocatalyst is 10 to 25 nm.

[0009] Preferably, the solvent includes an alcohol solvent and an inorganic solvent; the volume ratio of the alcohol solvent to the inorganic solvent is (9.5-10.5):1.

[0010] Preferably, the binder comprises a perfluorosulfonic acid polytetrafluoroethylene copolymer solution, a sodium alginate solution or a sodium carboxymethyl cellulose solution.

[0011] Preferably, the ratio of the mass of the electrocatalyst to the volume of the solvent is (7-14) mg:1 mL.

[0012] Preferably, the ratio of the total volume of the electrocatalyst and the solvent to the volume of the binder is 1:(85-95).

[0013] The present invention also provides a method for preparing the coating for promoting titanium or titanium alloy to form titanium hydride as described in the above technical solution, comprising:

[0014] The electrocatalyst, solvent and binder are mixed to obtain a coating that promotes titanium or titanium alloy to form titanium hydride.

[0015] The present invention also provides a coating that promotes titanium or titanium alloy to form titanium hydride, which is obtained by drying the coating described in the above technical solution or the coating prepared by the preparation method described in the above technical solution.

[0016] Preferably, the coating has a thickness of 2 to 3 μm.

[0017] The present invention also provides the use of the coating described in the above technical solution, or the coating prepared by the preparation method described in the above technical solution, or the coating described in the above technical solution in electrochemical hydrogen charging of titanium or titanium alloy.

[0018] The present invention provides a coating that promotes the formation of titanium hydride on titanium or titanium alloys. The raw materials include an electrocatalyst, a solvent, and a binder; the electrocatalyst includes Ni3S2, Ni3N, or Mo2C. The present invention utilizes the electrocatalyst Ni3S2, Ni3N, or Mo2C, which has the property of easily adsorbing and difficultly desorbing hydrogen atoms. During hydrogen charging, hydrogen atoms are easily adsorbed to the surface of the coating, resulting in a significant increase in the hydrogen atom concentration gradient on the coating surface and a greater driving force for hydrogen atom penetration, which promotes the entry of more hydrogen atoms into the titanium or titanium alloy, thereby promoting the conversion of the titanium or titanium alloy into titanium hydride. Experimental results show that the thickness of the titanium hydride prepared by the method provided by the present invention is greater than 4μm. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of the coating provided by the present invention;

[0020] In the figure, 1 is the electrocatalyst, 2 is the binder, and 3 is the substrate titanium or titanium alloy;

[0021] Figure 2 This is the coating prepared in Example 2;

[0022] Figure 3 This is the coating prepared in Example 4;

[0023] Figure 4 This is the coating prepared in Example 6;

[0024] Figure 5 This is the cross section of the sample prepared in Application Example 1;

[0025] Figure 6 This is the cross section of the sample prepared in Application Example 2;

[0026] Figure 7 This is the cross section of the sample prepared in Application Example 3;

[0027] Figure 8 For comparison with the pure titanium sheet in Application Example 1;

[0028] Figure 9 This is the cross section of the sample prepared in Comparative Application Example 1;

[0029] Figure 10 This is the coating prepared in Comparative Example 2;

[0030] Figure 11 This is the cross section of the sample prepared in Comparative Application Example 2;

[0031] Figure 12 This is the coating prepared in Comparative Example 4;

[0032] Figure 13 This is the cross section of the sample prepared in Comparative Application Example 3;

[0033] Figure 14 is the thickness of titanium hydride in the samples prepared in Application Examples 1 to 3 and Comparative Application Examples 1 to 3. DETAILED DESCRIPTION

[0034] The present invention provides a coating for promoting titanium or titanium alloy to form titanium hydride, the raw materials of which include an electrocatalyst, a solvent and a binder;

[0035] The electrocatalyst includes Ni3S2, Ni3N or Mo2C.

[0036] The present invention has no particular limitation on the sources of the raw materials, and commercially available products known to those skilled in the art may be used.

[0037] The raw materials for preparing the coating provided by the present invention that promotes the formation of titanium hydride on titanium or titanium alloy include an electrocatalyst; the electrocatalyst includes Ni3S2, Ni3N or Mo2C; the electrocatalyst is preferably nanoscale; and the particle size of the electrocatalyst is preferably 10 to 25 nm. The present invention utilizes the electrocatalyst Ni3S2, Ni3N or Mo2C, which has the property of easily adsorbing and difficultly desorbing hydrogen atoms. During hydrogen charging, hydrogen atoms are easily adsorbed to the surface of the coating, resulting in a significant increase in the hydrogen atom concentration gradient on the coating surface, an increase in the driving force for hydrogen atom penetration, and the promotion of more hydrogen atoms into the titanium or titanium alloy, thereby promoting the conversion of the titanium or titanium alloy into titanium hydride.

[0038] The raw materials for preparing the coating for promoting the formation of titanium hydride on titanium or titanium alloys provided by the present invention also include a solvent; the solvent preferably includes an alcohol solvent and an inorganic solvent; the volume ratio of the alcohol solvent to the inorganic solvent is preferably (9.5-10.5):1. In the present invention, the solvent can dissolve the raw materials, and the use of an alcohol solvent and an inorganic solvent as the solvent can further promote the formation of titanium hydride on titanium or titanium alloys.

[0039] As an embodiment, the volume ratio of the alcohol solvent to the inorganic solvent may be 10:1.

[0040] In the present invention, the alcohol solvent is preferably isopropyl alcohol; and the inorganic solvent is preferably water.

[0041] The raw materials for preparing the coating provided by the present invention that promotes the formation of titanium hydride on titanium or titanium alloys also include a binder. The binder preferably includes a perfluorosulfonic acid polytetrafluoroethylene copolymer (Nafion) solution, a sodium alginate solution, or a sodium carboxymethyl cellulose solution, more preferably a perfluorosulfonic acid polytetrafluoroethylene copolymer solution. In the present invention, the binder facilitates the adhesion of the coating to the substrate. When the binder is a perfluorosulfonic acid polytetrafluoroethylene copolymer solution, it forms a proton exchange membrane after drying, allowing hydrogen atoms to permeate. This increases the hydrogen atom concentration gradient from the surface to the core of the titanium or titanium alloy, increases the driving force for hydrogen atom penetration, and allows more hydrogen atoms to enter the titanium or titanium alloy, further promoting the conversion of the titanium or titanium alloy into titanium hydride.

[0042] In the present invention, the mass concentration of the perfluorosulfonic acid polytetrafluoroethylene copolymer (Nafion) solution, the sodium alginate solution or the sodium carboxymethylcellulose solution is independently preferably 4 to 6%, more preferably 5%.

[0043] In the present invention, the ratio of the mass of the electrocatalyst to the volume of the solvent is preferably (7-14) mg:1 mL. As an embodiment, the ratio of the mass of the electrocatalyst to the volume of the solvent can be 8 mg:1 mL, 9 mg:1 mL, 10 mg:1 mL, 11 mg:1 mL, 12 mg:1 mL, or 13 mg:1 mL. The present invention limits the ratio of the mass of the electrocatalyst to the volume of the solvent to the above range, which can further promote the formation of titanium hydride by titanium or titanium alloy.

[0044] In the present invention, the ratio of the total volume of the electrocatalyst and the solvent to the volume of the binder is preferably 1:(85-95). As an embodiment, the ratio of the total volume of the electrocatalyst and the solvent to the volume of the binder can be 1:86, 1:87, 1:88, 1:89, 1:90, 1:91, 1:92, 1:93 or 1:94. The present invention limits the ratio of the total volume of the electrocatalyst and the solvent to the volume of the binder to the above range, which can further promote the formation of titanium hydride by titanium or titanium alloy.

[0045] The present invention utilizes electrocatalysts Ni3S2, Ni3N or Mo2C, which have the property of easily adsorbing but difficult to desorb hydrogen atoms. During hydrogen charging, hydrogen atoms are easily adsorbed to the surface of the coating, which greatly increases the hydrogen atom concentration gradient on the coating surface and the driving force for hydrogen atom penetration, thereby promoting more hydrogen atoms to enter the titanium or titanium alloy, thereby promoting the conversion of titanium or titanium alloy into titanium hydride.

[0046] The present invention also provides a method for preparing the coating for promoting titanium or titanium alloy to form titanium hydride as described in the above technical solution, comprising:

[0047] The electrocatalyst, solvent and binder are mixed to obtain a coating that promotes titanium or titanium alloy to form titanium hydride.

[0048] In the present invention, the operation of mixing the electrocatalyst, solvent and binder is preferably to mix the electrocatalyst and solvent, then add the binder and perform ultrasonic oscillation. The above mixing operation is conducive to more uniform mixing of the raw materials.

[0049] The present invention has no special limitation on the operation of mixing the electrocatalyst and the solvent, and the technical scheme for preparing the mixed material well known to those skilled in the art can be adopted.

[0050] In the present invention, the power of the ultrasonic oscillation is preferably 150-200 W, more preferably 180 W; the time of the ultrasonic oscillation is preferably 20-25 min. As an embodiment, the time of the ultrasonic oscillation can be 21 min, 22 min, 23 min or 24 min.

[0051] The preparation method provided by the invention has simple process.

[0052] The present invention also provides a coating that promotes titanium or titanium alloy to form titanium hydride, which is obtained by drying the coating described in the above technical solution or the coating prepared by the preparation method described in the above technical solution.

[0053] The present invention has no particular limitation on the drying operation, and the product may be dried to a constant weight.

[0054] In the present invention, the thickness of the coating layer is preferably 2 to 3 μm.

[0055] The structural diagram of the coating provided by the present invention is as follows Figure 1 As shown, in the figure, 1 is the electrocatalyst, 2 is the binder, and 3 is the matrix titanium or titanium alloy.

[0056] The present invention also provides the use of the coating described in the above technical solution, or the coating prepared by the preparation method described in the above technical solution, or the coating described in the above technical solution in electrochemical hydrogen charging of titanium or titanium alloy.

[0057] The present invention has no special limitation on the operation of the application, and operations well known to those skilled in the art may be used.

[0058] In the present invention, the titanium is preferably industrially pure titanium; the titanium alloy is preferably an α-type titanium alloy, a near-α-type titanium alloy, a β-type titanium alloy, a near-β-type titanium alloy, or an α+β-type titanium alloy. The present invention does not specifically limit the specific type of the industrially pure titanium; any titanium alloy well known to those skilled in the art can be used. The present invention does not specifically limit the specific type of the titanium alloy; any titanium alloy well known to those skilled in the art can be used.

[0059] The coating provided by the present invention is simple to prepare, can be prepared at room temperature, can effectively serve in an electrochemical hydrogen charging environment, and fully utilizes the cathode current during electrochemical hydrogen charging. Before electrochemical hydrogen charging, the coating can be applied to the surface of titanium or titanium alloy by spraying / brushing / spin coating / drip coating, etc. During electrochemical hydrogen charging, the coating promotes hydrogen atoms to enter the interior of the titanium or titanium alloy matrix under the action of the cathode current to form titanium hydride. After electrochemical hydrogen charging, the coating can be simply dissolved and removed without affecting the composition and structure of the formed titanium hydride.

[0060] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0061] Example 1

[0062] A coating for promoting titanium or titanium alloy to form titanium hydride, the raw materials of which are composed of an electrocatalyst, a solvent and a binder;

[0063] The electrocatalyst is Mo2C, nano-scale, with a particle size of 10 to 25 nm;

[0064] The solvent is isopropyl alcohol and water, and the volume ratio of isopropyl alcohol to water is 10:1;

[0065] The binder is Nafion solution with a mass concentration of 5%, and the domestic brand is Roen;

[0066] The ratio of the mass of the electrocatalyst to the volume of the solvent was 7 mg:1 mL;

[0067] The ratio of the total volume of the electrocatalyst and the solvent to the volume of the binder is 1:90;

[0068] The coating is prepared by adding an electrocatalyst into a solvent, then adding a binder, and performing ultrasonic oscillation at a power of 180 W for 20 minutes to obtain the coating.

[0069] Example 2

[0070] Pure titanium was cut into 20 mm × 10 mm × 1 mm sheet samples as a substrate, and then polished to 3000# with sandpaper, cleaned the surface, and then dried. The coating prepared in Example 1 was then applied to the surface of the substrate by drop coating, and then naturally dried to obtain a coating, wherein the coating had a thickness of 2 to 3 μm.

[0071] The coating prepared in Example 2 is as follows Figure 2 shown.

[0072] Example 3

[0073] Based on Example 1, the ratio of the mass of the electrocatalyst to the volume of the solvent was modified to 14 mg:1 mL, and other conditions remained unchanged.

[0074] Example 4

[0075] On the basis of Example 2, the coating was replaced with the coating of Example 3, and other conditions remained unchanged.

[0076] The coating prepared in Example 4 is as follows Figure 3 shown.

[0077] Example 5

[0078] Based on Example 3, the electrocatalyst was replaced with Ni3S2, and other conditions remained unchanged.

[0079] Example 6

[0080] On the basis of Example 4, the coating was replaced with the coating of Example 5, and other conditions remained unchanged.

[0081] The coating prepared in Example 6 is as follows Figure 4 shown.

[0082] Application Example 1

[0083] Two electrodes were used for hydrogen charging, that is, the Pt sheet was used as the anode, and the pure titanium coated with the coating prepared in Example 2 was used as the cathode. The electrolyte was a mixed solution of glycerol: phosphoric acid with a volume ratio of 1:1. The uncoated side of the cathode was covered with insulating silicone and did not contact the electrolyte. During the experiment, 50 mA / cm was applied between the cathode and the anode. 2 The hydrogen charging current was set at 1000 nm, the hydrogen charging was carried out for 24 hours, and the hydrogen charging area was 10 mm × 10 mm. After the hydrogen charging was completed, the sample was taken out, the coating was removed with acetone, and the thickness of the titanium hydride layer on the cross section of the sample was observed after washing and drying.

[0084] The cross section of the sample prepared in Application Example 1 is as follows: Figure 5 shown.

[0085] Application Example 2

[0086] Two electrodes were used for hydrogen charging, that is, the Pt sheet was used as the anode, and the pure titanium coated with the coating prepared in Example 4 was used as the cathode. The electrolyte was a mixed solution of glycerol: phosphoric acid with a volume ratio of 1:1. The uncoated side of the cathode was covered with insulating silicone and did not contact the electrolyte. During the experiment, 50 mA / cm was applied between the cathode and the anode. 2 The hydrogen charging current was set at 1000 nm, the hydrogen charging was carried out for 24 hours, and the hydrogen charging area was 10 mm × 10 mm. After the hydrogen charging was completed, the sample was taken out, the coating was removed with acetone, and the thickness of the titanium hydride layer on the cross section of the sample was observed after washing and drying.

[0087] The cross section of the sample prepared in Application Example 2 is as follows: Figure 6 shown.

[0088] Application Example 3

[0089] Two electrodes were used for hydrogen charging, that is, the Pt sheet was used as the anode, and the pure titanium coated with the coating prepared in Example 6 was used as the cathode. The electrolyte was a mixed solution of glycerol: phosphoric acid with a volume ratio of 1:1. The uncoated side of the cathode was covered with insulating silicone and did not contact the electrolyte. During the experiment, 50 mA / cm was applied between the cathode and the anode. 2 The hydrogen charging current was set at 1000 nm, the hydrogen charging was carried out for 24 hours, and the hydrogen charging area was 10 mm × 10 mm. After the hydrogen charging was completed, the sample was taken out, the coating was removed with acetone, and the thickness of the titanium hydride layer on the cross section of the sample was observed after washing and drying.

[0090] The cross section of the sample prepared in Application Example 3 is as follows: Figure 7 shown.

[0091] Comparative Application Example 1

[0092] Pure titanium was cut into 20mm×10mm×1mm sheet samples, polished to 3000# with sandpaper, cleaned and dried, and used as cathode, and Pt sheet as anode. The electrolyte was a mixed solution of glycerol: phosphoric acid with a volume ratio of 1:1. The other side of the cathode was covered with insulating silicone and did not contact the electrolyte. During the experiment, 50mA / cm was applied between the cathode and anode. 2 The hydrogen charging current was set at 1000 nm, the hydrogen charging time was 24 hours, the hydrogen charging area was 10 mm × 10 mm, and after the hydrogen charging was completed, the sample was taken out, cleaned and dried, and the thickness of the titanium hydride layer on the cross section of the sample was observed.

[0093] Comparative Application Example 1: Figure 8 As shown, the cross section of the sample prepared in Comparative Application Example 1 is as follows Figure 9 shown.

[0094] Comparative Example 1

[0095] Based on Example 1, the electrocatalyst was omitted and other conditions remained unchanged.

[0096] Comparative Example 2

[0097] On the basis of Example 1, the coating was replaced with the coating of Comparative Example 1, and other conditions remained unchanged.

[0098] The coating prepared in Comparative Example 2 is as follows Figure 10 shown.

[0099] Comparative Application Example 2

[0100] Two electrodes were used for hydrogen charging, that is, the Pt sheet was used as the anode, and the pure titanium coated with the coating prepared in Comparative Example 2 was used as the cathode. The electrolyte was a mixed solution of glycerol and phosphoric acid with a volume ratio of 1:1. The uncoated side of the cathode was covered with insulating silicone and did not contact the electrolyte. During the experiment, 50 mA / cm was applied between the cathode and the anode. 2 The hydrogen charging current was set at 1000 nm, the hydrogen charging was carried out for 24 hours, and the hydrogen charging area was 10 mm × 10 mm. After the hydrogen charging was completed, the sample was taken out, the coating was removed with acetone, and the thickness of the titanium hydride layer on the cross section of the sample was observed after washing and drying.

[0101] The cross section of the sample prepared in comparative application example 2 is as follows: Figure 11 shown.

[0102] Comparative Example 3

[0103] Based on Example 1, the electrocatalyst and solvent were omitted, and other conditions remained unchanged.

[0104] Comparative Example 4

[0105] On the basis of Example 1, the coating was replaced by the coating of Comparative Example 2, and other conditions remained unchanged.

[0106] The coating prepared in Comparative Example 4 is as follows Figure 12 shown.

[0107] Comparative Application Example 3

[0108] Two electrodes were used for hydrogen charging, that is, the Pt sheet was used as the anode, and the pure titanium coated with the coating prepared in Comparative Example 4 was used as the cathode. The electrolyte was a mixed solution of glycerol: phosphoric acid with a volume ratio of 1:1. The uncoated side of the cathode was covered with insulating silicone and did not contact the electrolyte. During the experiment, 50 mA / cm was applied between the cathode and the anode. 2 The hydrogen charging current was set at 1000 nm, the hydrogen charging was carried out for 24 hours, and the hydrogen charging area was 10 mm × 10 mm. After the hydrogen charging was completed, the sample was taken out, the coating was removed with acetone, and the thickness of the titanium hydride layer on the cross section of the sample was observed after washing and drying.

[0109] The cross section of the sample prepared in comparative application example 3 is as follows: Figure 13 shown.

[0110] The thickness of the titanium hydride in the samples prepared in Application Examples 1 to 3 and Comparative Application Examples 1 to 3 is as follows: Figure 14 As shown in the figure, 1# is comparative application example 1, 2# is comparative application example 2, 3# is comparative application example 3, 4# is application example 1, 5# is application example 2, and 6# is application example 3.

[0111] from Figures 2 to 14It can be seen that the use of a binder can further increase the thickness of titanium hydride; the use of an electrocatalyst can further increase the thickness of titanium hydride; and the electrocatalyst Mo2C can further increase the thickness of titanium hydride compared to Ni3S2.

[0112] Example 7

[0113] Based on Example 3, the electrocatalyst was replaced with Ni3N, and other conditions remained unchanged.

[0114] Example 8

[0115] On the basis of Example 4, the coating was replaced with the coating of Example 7, and other conditions remained unchanged.

[0116] Application Example 4

[0117] Two electrodes were used for hydrogen charging, that is, the Pt sheet was used as the anode, and the pure titanium coated with the coating prepared in Example 8 was used as the cathode. The electrolyte was a mixed solution of glycerol: phosphoric acid with a volume ratio of 1:1. The uncoated side of the cathode was covered with insulating silicone and did not contact the electrolyte. During the experiment, 50 mA / cm was applied between the cathode and the anode. 2 The hydrogen charging current was set at 1000 nm, the hydrogen charging time was 24 hours, the hydrogen charging area was 10 mm × 10 mm, and after the hydrogen charging was completed, the sample was taken out, the coating was removed with acetone, and the thickness of the titanium hydride layer on the cross section of the sample was observed after washing and drying, and the thickness of the titanium hydride layer was found to be 13 to 15 μm.

[0118] Example 9

[0119] On the basis of Example 1, the solvent was changed to isopropyl alcohol, and other conditions remained unchanged.

[0120] Example 10

[0121] On the basis of Example 1, the coating was replaced with the coating of Example 9, and other conditions remained unchanged.

[0122] Application Example 5

[0123] Two electrodes were used for hydrogen charging, that is, the Pt sheet was used as the anode, and the pure titanium coated with the coating prepared in Example 10 was used as the cathode. The electrolyte was a mixed solution of glycerol: phosphoric acid with a volume ratio of 1:1. The uncoated side of the cathode was covered with insulating silicone and did not contact the electrolyte. During the experiment, 50 mA / cm was applied between the cathode and the anode. 2 The hydrogen charging current was set at 1000 nm, the hydrogen charging time was 24 hours, and the hydrogen charging area was 10 mm × 10 mm. After the hydrogen charging was completed, the sample was taken out, the coating was removed with acetone, and the thickness of the titanium hydride layer on the cross section of the sample was observed after washing and drying, and the thickness of the titanium hydride layer was found to be 4 to 6 μm.

[0124] Example 11

[0125] On the basis of Example 1, the solvent was changed to water, and other conditions remained unchanged.

[0126] Example 12

[0127] On the basis of Example 1, the coating was replaced with the coating of Example 11, and other conditions remained unchanged.

[0128] Application Example 6

[0129] Two electrodes were used for hydrogen charging, i.e., a Pt sheet was used as the anode, and pure titanium coated with the coating prepared in Example 12 was used as the cathode. The electrolyte was a mixed solution of glycerol and phosphoric acid with a volume ratio of 1:1. The uncoated side of the cathode was covered with insulating silicone and did not contact the electrolyte. During the experiment, 50 mA / cm was applied between the cathode and the anode. 2 The hydrogen charging current was set at 1000 nm, the hydrogen charging time was 24 hours, and the hydrogen charging area was 10 mm × 10 mm. After the hydrogen charging was completed, the sample was taken out, the coating was removed with acetone, and the thickness of the titanium hydride layer on the cross section of the sample was observed after washing and drying, and the thickness of the titanium hydride layer was found to be 4 to 6 μm.

[0130] Example 13

[0131] On the basis of Example 1, the binder was changed to sodium alginate solution, and other conditions remained unchanged.

[0132] Example 14

[0133] On the basis of Example 1, the coating was replaced with the coating of Example 13, and other conditions remained unchanged.

[0134] Application Example 7

[0135] Two electrodes were used for hydrogen charging, that is, the Pt sheet was used as the anode, and the pure titanium coated with the coating prepared in Example 14 was used as the cathode. The electrolyte was a mixed solution of glycerol: phosphoric acid with a volume ratio of 1:1. The uncoated side of the cathode was covered with insulating silicone and did not contact the electrolyte. During the experiment, 50 mA / cm was applied between the cathode and the anode. 2 The hydrogen charging current was set at 1000 nm, the hydrogen charging was carried out for 24 hours, the hydrogen charging area was 10 mm × 10 mm, and after the hydrogen charging was completed, the sample was taken out, the coating was removed with acetone, and the thickness of the titanium hydride layer on the cross section of the sample was observed after washing and drying, and the thickness of the titanium hydride layer was found to be 10 to 12 μm.

[0136] Example 15

[0137] On the basis of Example 1, the binder was changed to sodium carboxymethyl cellulose solution, and other conditions remained unchanged.

[0138] Example 16

[0139] On the basis of Example 1, the coating was replaced with the coating of Example 15, and other conditions remained unchanged.

[0140] Application Example 8

[0141] Two electrodes were used for hydrogen charging, i.e., a Pt sheet was used as the anode, and pure titanium coated with the coating prepared in Example 16 was used as the cathode. The electrolyte was a mixed solution of glycerol and phosphoric acid with a volume ratio of 1:1. The uncoated side of the cathode was covered with insulating silicone and did not contact the electrolyte. During the experiment, 50 mA / cm was applied between the cathode and the anode. 2 The hydrogen charging current was set at 1000 nm, the hydrogen charging was carried out for 24 hours, the hydrogen charging area was 10 mm × 10 mm, and after the hydrogen charging was completed, the sample was taken out, the coating was removed with acetone, and the thickness of the titanium hydride layer on the cross section of the sample was observed after washing and drying, and the thickness of the titanium hydride layer was found to be 10 to 12 μm.

[0142] It can be seen from the above examples and comparative examples that the coating provided by the present invention can promote titanium or titanium alloy to form titanium hydride.

[0143] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A coating for promoting titanium or titanium alloy to form titanium hydride, the raw materials comprising an electrocatalyst, a solvent and a binder; The electrocatalyst includes Ni3S2, Ni3N or Mo2C.

2. The coating according to claim 1, characterized in that The electrocatalyst is nano-scale; the particle size of the electrocatalyst is 10-25 nm.

3. The coating according to claim 1, characterized in that The solvent includes an alcohol solvent and an inorganic solvent; the volume ratio of the alcohol solvent to the inorganic solvent is (9.5-10.5):

1.

4. The coating according to claim 1, characterized in that The binder includes perfluorosulfonic acid polytetrafluoroethylene copolymer solution, sodium alginate solution or sodium carboxymethyl cellulose solution.

5. The coating according to claim 1, characterized in that The ratio of the mass of the electrocatalyst to the volume of the solvent is (7-14) mg:1 mL.

6. The coating according to claim 1, characterized in that The ratio of the total volume of the electrocatalyst and the solvent to the volume of the binder is 1:(85-95).

7. The method for preparing the coating for promoting titanium or titanium alloy to form titanium hydride according to any one of claims 1 to 6, comprising: The electrocatalyst, solvent and binder are mixed to obtain a coating that promotes titanium or titanium alloy to form titanium hydride.

8. A coating for promoting titanium or titanium alloy to form titanium hydride, obtained by drying the coating according to any one of claims 1 to 6 or the coating prepared by the preparation method according to claim 7.

9. The coating according to claim 8, characterized in that The thickness of the coating is 2-3 μm.

10. Use of the coating according to any one of claims 1 to 6, or the coating prepared by the preparation method according to claim 7, or the coating according to claim 8 or 9 in electrochemical hydrogen charging of titanium or titanium alloy.

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