CN111672729B - Preparation method of inner wall coating of pipe fitting with inner diameter not less than 30mm - Google Patents
Preparation method of inner wall coating of pipe fitting with inner diameter not less than 30mm Download PDFInfo
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- CN111672729B CN111672729B CN202010379010.6A CN202010379010A CN111672729B CN 111672729 B CN111672729 B CN 111672729B CN 202010379010 A CN202010379010 A CN 202010379010A CN 111672729 B CN111672729 B CN 111672729B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
- B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
- B05D7/225—Coating inside the pipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
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Abstract
The invention discloses a preparation method of an inner wall coating of a pipe fitting with an inner diameter not less than 30mm, which comprises the following steps: removing oil stain and dirt on the inner wall of the pipe fitting, fixedly installing insulating sealing end covers at two ends of the pipe fitting, and hermetically penetrating anodes through the insulating sealing end covers at the two ends, wherein liquid inlets and liquid outlets are respectively arranged on the insulating sealing end covers at the two ends; introducing dilute acid into the pipe fitting from a liquid inlet by using a circulating pump for pickling activation, discharging the dilute acid from the liquid outlet, introducing clean water into the pipe fitting, introducing a plating solution added with insulating ceramic microspheres into the pipe fitting from the liquid inlet by using the circulating pump, electrically connecting the anode and the pipe fitting with two stages of a power supply respectively, and after the power supply is switched on, adjusting parameters according to a set process to deposit a coating on the inner wall of the pipe fitting; and introducing clean water into the pipe fitting by using a circulating pump for circulation to obtain a layer of inner wall coating. The preparation method can prepare complete and uniform various coatings on the inner wall of the pipe fitting with the caliber of not less than 30mm, improve the corrosion resistance and wear resistance of the pipe fitting and further prolong the service life of the pipe fitting.
Description
Technical Field
The invention relates to the field of surface coatings, in particular to a preparation method of an inner wall coating of a pipe fitting with an inner diameter of not less than 30 mm.
Background
At present, various coating processes are used for surface strengthening of parts. The processes have good applicability to the outer surfaces of the parts. Process accessibility and coating quality uniformity are challenging for the inner surfaces of parts, especially the inner walls of elongated pipes.
The existing preparation method of the pipe fitting inner wall coating comprises thermal spraying, electroplating, chemical plating, vapor deposition and the like, for example, a special inner hole spray gun for thermal spraying can realize the preparation of an inner diameter coating with the diameter of more than 70mm, for example, Chinese patent with the publication number of CN110643925A discloses a multilayer inner hole coating and a spraying method thereof, which adopts an inner hole rotating plasma spraying method to prepare a metal and wear-resistant coating on the inner wall of an aluminum alloy cylinder, the minimum inner diameter of the aimed cylinder is about 70mm, and for the cylinder with smaller inner diameter, the preparation of the coating is difficult to realize due to the limitation of the equipment size and the process; for vapor deposition, the preparation of the coating is generally realized in vacuum or in a heated atmosphere, and the process applicability is narrow. For example, the chinese patent publication No. CN108559977A discloses a method and apparatus for low temperature coating on the inner wall of a slender metal tube, which is to deposit a protective coating on the inner wall of the slender metal tube by using a metal organic chemical vapor deposition method, the tube needs to be heated to 600 ℃, and the deposition time needs tens of hours; electroplating and electroless plating are advantageous because of their high solution accessibility and the ability to deposit coatings at near room temperature, but are important to control solution uniformity inside the pipe and the removal of gases from the electrochemical reaction.
Therefore, the preparation of the corrosion-resistant and wear-resistant coating on the inner wall of the pipe with the caliber of 30mm or more by using the electroplating technology can ensure the uniformity of the plating solution on the inner wall of the pipe and prevent gas from gathering in the preparation process, and is the key point of the current research of technical personnel.
Disclosure of Invention
In view of the above, the invention aims to provide a method for preparing an inner wall coating of a pipe fitting with an inner diameter of not less than 30mm, the method can prepare a metal composite coating with excellent performance on the inner wall of the pipe fitting with an inner diameter of not less than 30mm in an electroplating mode, so that the corrosion resistance and the wear resistance of the pipe fitting under the action of an internal medium are improved, and the service life is prolonged.
The technical scheme adopted by the invention to solve the technical problems is as follows:
a preparation method of an inner wall coating of a pipe fitting with an inner diameter not less than 30mm comprises the following steps:
(1) removing oil stains and dirt on the inner wall of the pipe fitting, wherein the cleaned inner wall of the pipe fitting can keep a continuous water film for more than 20 s;
(2) fixedly installing insulating seal end covers at two ends of the pipe fitting processed in the step (1), wherein anodes parallel to the pipe fitting are hermetically arranged in the insulating seal end covers at the two ends in a penetrating manner, liquid inlets and liquid outlets are respectively arranged on the insulating seal end covers at the two ends, and the liquid inlets and the liquid outlets are connected with a circulating pump pipeline;
(3) introducing dilute acid into the pipe fitting from the liquid inlet by using a circulating pump for acid pickling activation, discharging the acid-pickled dilute acid from the liquid outlet, circulating for 5-10 min, and introducing clear water into the pipe fitting for circulating for 3-5 min;
(4) introducing a plating solution added with insulating ceramic microspheres into the pipe fitting from a liquid inlet by using a circulating pump, electrically connecting the anode and the pipe fitting with two stages of a power supply respectively, and after the power supply is switched on, adjusting parameters according to a set process to deposit a coating on the inner wall of the pipe fitting;
(5) and introducing clean water into the pipe fitting by using a circulating pump for circulation so as to remove residual plating solution and insulating ceramic microspheres, thus obtaining a layer of inner wall coating.
Further, in the step (1), the method for removing the oil stains and dirt on the inner wall of the pipe fitting is a chemical reagent soaking and brushing method or a physical shot blasting method.
Further, in the step (2), the insulating sealing end cover is composed of an insulating sealing ring and a ring-shaped clamp installed inside the insulating sealing ring, wherein the outer diameter of the insulating sealing ring is consistent with the outer diameter of the pipe fitting, the outer diameter of the ring-shaped clamp is consistent with the inner diameter of the insulating sealing ring, and an anode parallel to the pipe fitting penetrates through the center of the ring-shaped clamp in a sealing mode.
Further, in the step (2), the height of the liquid inlet is lower than that of the liquid outlet.
Further, in the step (3), the dilute acid used is 5% by mass of dilute hydrochloric acid or 5% by mass of dilute sulfuric acid.
Further, in the step (4), the adding mass of the insulating ceramic microspheres is 0.5-1.5% of the mass of the plating solution, and the diameters of the insulating ceramic microspheres are 0.2-1 mm.
Further, in the step (4), the insulating ceramic microspheres are made of alumina or zirconia.
Further, the pipe fitting is made of carbon steel, and the preparation method of the coating on the inner wall of the pipe fitting comprises the following steps:
(1) removing oil stains and dirt on the inner wall of the pipe fitting, wherein the cleaned inner wall of the pipe fitting can keep a continuous water film for more than 20 s;
(2) fixedly installing insulating seal end covers at two ends of the pipe fitting processed in the step (1), wherein anodes parallel to the pipe fitting are hermetically arranged in the insulating seal end covers at the two ends in a penetrating manner, liquid inlets and liquid outlets are respectively arranged on the insulating seal end covers at the two ends, and the liquid inlets and the liquid outlets are connected with a circulating pump pipeline;
(3) introducing dilute acid into the pipe fitting from the liquid inlet by using a circulating pump for pickling activation, discharging the acid-washed acid out of the liquid outlet, circulating for 5-10 min, and then introducing clear water into the pipe fitting for circulating for 3-5 min;
(4) introducing a plating solution added with insulating ceramic microspheres into the pipe fitting from a liquid inlet by using a circulating pump, wherein the plating solution is prepared from 300g/L NiSO4.6H2O and 40g/L of H3BO3Prepared by switching on a power supply at 6A/dm2The current density of (a) was carried out for a 50min primary coating deposition;
(5) introducing clean water into the pipe fitting for 10min by using a circulating pump to remove residual plating solution and insulating ceramic microspheres;
(6) introducing a plating solution added with insulating ceramic microspheres into the pipe fitting from a liquid inlet by using a circulating pump, wherein the plating solution is prepared from 200g/L of NiSO4.6H2O, 70g/L Na2WO4.2H2O and 10g/L of H3BO3Prepared by switching on a power supply at 6A/dm2The current density of (a) was carried out for a secondary coating deposition of 200 min; and introducing clear water into the pipe fitting for 5min by using a circulating pump to finally obtain the double-layer coating with the thickness of 50-75 mu m.
Further, the pipe fitting is made of stainless steel, and the preparation method of the coating comprises the following steps:
(1) removing oil stains and dirt on the inner wall of the pipe fitting, wherein the cleaned inner wall of the pipe fitting can keep a continuous water film for more than 20 s;
(2) fixedly installing insulating seal end covers at two ends of the pipe fitting processed in the step (1), wherein anodes parallel to the pipe fitting are hermetically arranged in the insulating seal end covers at the two ends in a penetrating manner, liquid inlets and liquid outlets are respectively arranged on the insulating seal end covers at the two ends, and the liquid inlets and the liquid outlets are connected with a circulating pump pipeline;
(3) introducing dilute acid into the pipe fitting from the liquid inlet by using a circulating pump for acid pickling activation, discharging the acid-pickled dilute acid from the liquid outlet, circulating for 5-10 min, and introducing clear water into the pipe fitting for circulating for 3-5 min;
(4) by means of a circulating pumpIntroducing a plating solution added with insulating ceramic microspheres into the pipe fitting through a liquid port, wherein the plating solution is prepared from 60g/L ZnCl, 200g/L NaCl and 30g/L H3BO3Prepared by switching on a power supply at a rate of 3A/dm2Current density of 120min was performed for coating deposition;
(5) and introducing clean water into the pipe fitting for 3-5 min by using a circulating pump to obtain a coating with the thickness of 20-40 mu m.
Has the advantages that:
as mentioned above, the preparation method of the inner wall coating of the pipe fitting with the inner diameter not less than 30mm has the following beneficial effects:
1. by adopting the preparation method of the pipe inner wall coating provided by the invention, the circulation of the plating solution is increased by the circulating pump, and the insulating ceramic microspheres are added into the flowing plating solution to form the double functions of micro stirring, so that the components and the process temperature of the plating solution in the pipe are ensured, the activity of the plating solution is improved, and the aggregation of bubbles is avoided. The insulating ceramic microspheres are added into the plating solution, the insulating ceramic microspheres do not chemically react with the plating solution, the quality of the plating solution is guaranteed, the stability under the action of an external current for electroplating is also guaranteed in an insulating way, the insulating ceramic microspheres flow along with the plating solution under the action of a circulating pump, the flowing of the plating solution can be enhanced by the solid microspheres, meanwhile, the large bubbles generated on the inner wall are squeezed and broken, and the preparation quality and efficiency of the inner wall coating are improved. The preparation method can prepare complete and uniform various coatings on the inner wall of the pipe fitting with the caliber of not less than 30mm, improve the corrosion resistance and wear resistance of the pipe fitting and further prolong the service life of the pipe fitting.
2. In the invention, insulating sealing end covers are arranged at two end parts of the pipe fitting, a liquid inlet and a liquid outlet are respectively arranged on the insulating sealing end covers at the two end parts, and the liquid inlet and the liquid outlet are connected with a circulating pump pipeline, so that plating solution only circulates in the pipe fitting, and the electroplating reaction is limited to be carried out only on the inner wall of the pipe fitting. The height of the liquid inlet is lower than that of the liquid outlet, so that gas can be conveniently discharged, the gas is prevented from being accumulated on the inner wall of the pipe fitting, and finally, the complete and uniform preparation of the coating on the inner wall of the pipe fitting is realized.
The present invention will be described in further detail with reference to the drawings and specific examples.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic view of the structure of the pipe and the end cap, the anode, the liquid inlet and the liquid outlet.
The device comprises a graphic mark 1, an insulating sealing end cover 11, an insulating sealing ring 12, a ring-shaped clamp 2, an anode 3, a liquid inlet 4, a liquid outlet 5, insulating ceramic microspheres 6, a plating solution 7 and a pipe fitting.
Detailed Description
The core of the invention is to provide a preparation method of an inner wall coating of a pipe fitting 7 with an inner diameter not less than 30mm, which comprises the following steps:
(1) removing oil stains and dirt on the inner wall of the pipe fitting 7 by using a chemical reagent soaking and scrubbing method or a physical shot blasting method, wherein the inner wall of the cleaned pipe fitting 7 can keep a continuous water film for more than 20 s;
(2) fixedly installing insulating seal end covers 1 at two end parts of the pipe fitting 7 treated in the step (1), sealing and penetrating anodes 2 parallel to the pipe fitting 7 in the insulating seal end covers 1 at the two end parts, respectively arranging a liquid inlet 3 and a liquid outlet 4 on the insulating seal end covers 1 at the two end parts, connecting the liquid inlet 3 and the liquid outlet 4 with a circulating pump pipeline, and enabling the height of the liquid inlet 3 to be lower than that of the liquid outlet 4; in detail, referring to fig. 1, the insulating end cap 1 is composed of an insulating sealing ring 11 and a ring clamp 12 installed inside the insulating sealing ring 11, wherein an outer diameter of the insulating sealing ring 11 is identical to an outer diameter of the pipe 77, an outer diameter of the ring clamp 12 is identical to an inner diameter of the insulating sealing ring 11, an anode 2 parallel to the pipe 7 is hermetically inserted through a center of the ring clamp 12, and a liquid inlet 3 and a liquid outlet 4 are installed on the ring clamp 12;
(3) introducing 5 mass percent of dilute hydrochloric acid or 5 mass percent of dilute sulfuric acid into the pipe fitting 7 from the liquid inlet 3 by using a circulating pump for acid washing activation, discharging the acid-washed water out of the pipe fitting 7 for 5-10 min, and then introducing clean water into the pipe fitting 7 for 3-5 min after circulation;
(4) introducing a plating solution 6 added with insulating ceramic microspheres 5 into a pipe fitting 7 from a liquid inlet 3 by using a circulating pump, electrically connecting an anode 2 and the pipe fitting 7 at two stages of a power supply respectively, and after the power supply is switched on, adjusting parameters according to a set process to deposit a coating on the inner wall of the pipe fitting 7; the adding mass of the insulating ceramic microspheres 5 is 0.5-1.5% of the mass of the plating solution 6, and the diameter of the insulating ceramic microspheres 5 is 0.2-1 mm. The insulating ceramic microspheres 5 are made of alumina or zirconia;
(5) introducing clean water into the pipe fitting 7 by using a circulating pump for circulation so as to remove the residual plating solution 6 and the insulating ceramic microspheres 5;
(6) and (5) repeating the step (4) and the step (5) until the deposition of the coating is completed, and then removing the insulating sealing end cover 1 and the anode 2.
Example 1
A preparation method of a coating on the inner wall of a carbon steel pipe 7 with the size of phi 30 x 1000mm mainly comprises the following steps:
(1) removing oil stains and dirt on the inner wall of the pipe fitting 7 by using a physical shot blasting method, wherein the inner wall of the cleaned pipe fitting 7 can keep a continuous water film for more than 20 s;
(2) fixedly installing insulating seal end covers 1 at two end parts of the pipe fitting 7 treated in the step (1), sealing and penetrating anodes 2 parallel to the pipe fitting 7 in the insulating seal end covers 1 at the two end parts, respectively arranging a liquid inlet 3 and a liquid outlet 4 on the insulating seal end covers 1 at the two end parts, and connecting the liquid inlet 3 and the liquid outlet 4 with a circulating pump pipeline; specifically, the material of the anode 2 is nickel;
(3) introducing 5% dilute sulfuric acid into the pipe fitting 7 from the liquid inlet 3 by using a circulating pump for pickling and activating, discharging the acid-washed water is discharged from the liquid outlet 4, and is circulated for 5min, and then, introduced into the pipe fitting 7 for 5 min;
(4) according to NiSO4.6H2O 300g/L，H3BO340g/L of plating solution 6 is prepared, and alumina insulating ceramic microspheres 5 with the diameter of 0.4mm accounting for 1wt percent of the mass of the plating solution are added into the plating solution,introducing a plating solution 6 added with insulating ceramic microspheres 5 into a pipe fitting 7 from a liquid inlet 3 by using a circulating pump, electrically connecting the anode 2 and the pipe fitting 7 at two stages of a power supply respectively, and switching on the power supply at a ratio of 6A/dm2Current density of (a) was carried out for 50min of coating deposition;
(5) and after clean water is introduced into the pipe fitting 7 by using a circulating pump for 3min, the insulating sealing end cover 1 and the anode 2 are removed, and finally the inner wall of the pipe fitting 7 is uniformly and completely coated with a Ni coating with the thickness of 10-15 mu m.
Example 2
A preparation method of a coating on the inner wall of a stainless steel pipe fitting 7 with the size of phi 36 multiplied by 1500mm mainly comprises the following steps:
(1) soaking the pipe 7 by using the CKSO1 degreasing agent with the concentration of 5-10g/L and washing the pipe by using clean water to remove oil stains on the inner wall of the pipe 7, wherein the inner wall of the cleaned pipe 7 can keep a continuous water film for more than 20 s;
(2) fixedly installing insulating seal end covers 1 at two end parts of the pipe fitting 7 treated in the step (1), sealing and penetrating anodes 2 parallel to the pipe fitting 7 in the insulating seal end covers 1 at the two end parts, respectively arranging a liquid inlet 3 and a liquid outlet 4 on the insulating seal end covers 1 at the two end parts, and connecting the liquid inlet 3 and the liquid outlet 4 with a circulating pump pipeline; in detail, the anode 2 is made of zinc;
(3) introducing 5% HCl into the pipe fitting 7 from the liquid inlet 3 by using a circulating pump for acid washing activation, discharging the HCl from the liquid outlet 4, circulating for 10min, and introducing clean water into the pipe fitting 7 for circulating for 3 min;
(4) according to ZnCl 60g/L, NaCl 200g/L, H3BO330g/L of plating solution 6 is prepared, zirconia insulating ceramic microspheres 5 with the diameter of 0.3mm accounting for 2wt% of the mass of the plating solution are added into the plating solution, the plating solution 6 added with the insulating ceramic microspheres 5 is introduced into a pipe fitting 7 from a liquid inlet 3 by a circulating pump, the power supply is switched on, and the plating solution is heated to 3A/dm2Current density of 120min was performed for coating deposition;
(5) and introducing clear water into the pipe fitting 7 for 4min by using a circulating pump, removing the insulating sealing end cover 1 and the anode 2, and finally obtaining a uniform and complete Zn coating with the thickness of 20-40 mu m on the inner wall of the pipe fitting 7.
Example 3
The embodiment 3 is continued on the basis of the embodiment 1, after a Ni coating with the thickness of 10-15 mu m is deposited on the inner wall of the carbon steel pipe 7, clean water is introduced into the pipe 7 for 10min by using a circulating pump to remove the residual plating solution 6 and the insulating ceramic microspheres 5; according to NiSO4.6H2O 200g/L，Na2WO4.2H2O 70g/L，H3BO310g/L of plating solution 6 is prepared, alumina insulating ceramic microspheres with the diameter of 0.6mm accounting for 1.5wt% of the mass of the plating solution are added into the plating solution, the plating solution 6 added with the insulating ceramic microspheres 5 is introduced into a pipe fitting 7 from a liquid inlet 3 by a circulating pump, the power supply is switched on, and the plating solution is supplied at the power supply of 6A/dm2The current density of (a) was carried out for a secondary coating deposition of 200 min; and introducing clean water into the pipe fitting 7 by using a circulating pump for 5min, removing the insulating sealing end cover 1 and the anode 2, finally obtaining a uniform and complete Ni-W composite coating with the thickness of 40-60 mu m on the inner wall of the pipe fitting 7, and finally obtaining a Ni + Ni-W double-layer coating with the thickness of 50-75 mu m on the inner wall of the pipe fitting 7.
The method for preparing the inner wall coating of the pipe 7 having an inner diameter of not less than 30mm provided by the present invention is described in detail above, and the principle and the specific embodiment of the present invention are illustrated herein by using specific examples, which are only used to help understand the method and the core idea of the present invention. It should be noted that any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the protective scope of the present invention to those skilled in the art.
Claims (8)
1. A preparation method of an inner wall coating of a pipe fitting with an inner diameter not less than 30mm is characterized by comprising the following steps:
(1) removing oil stains and dirt on the inner wall of the pipe fitting, wherein the cleaned inner wall of the pipe fitting can keep a continuous water film for more than 20 s;
(2) fixedly mounting insulating sealing end covers at two ends of the pipe fitting processed in the step (1), and hermetically penetrating anodes parallel to the pipe fitting in the insulating sealing end covers at the two ends, wherein a liquid inlet and a liquid outlet are respectively arranged on the insulating sealing end covers at the two ends and are connected with a circulating pump pipeline;
(3) introducing dilute acid into the pipe fitting from the liquid inlet by using a circulating pump for acid pickling activation, discharging the acid-pickled dilute acid from the liquid outlet, circulating for 5-10 min, and introducing clear water into the pipe fitting for circulating for 3-5 min;
(4) introducing a plating solution added with insulating ceramic microspheres into the pipe fitting from a liquid inlet by using a circulating pump, respectively electrically connecting the anode and the pipe fitting with two poles of a power supply, and after the power supply is switched on, carrying out parameter adjustment according to a set process to deposit a coating on the inner wall of the pipe fitting;
(5) introducing clean water into the pipe fitting by using a circulating pump for circulation so as to remove residual plating solution and insulating ceramic microspheres, and obtaining a layer of inner wall coating;
in the step (4), the adding mass of the insulating ceramic microspheres is 0.5-1.5% of the mass of the plating solution, and the diameters of the insulating ceramic microspheres are 0.2-1 mm.
2. The method for preparing an inner wall coating of a pipe fitting having an inner diameter of not less than 30mm as claimed in claim 1, wherein the method for removing the oil stains on the inner wall of the pipe fitting in the step (1) is chemical agent immersion scrubbing or physical shot blasting.
3. The method for preparing an inner wall coating of a pipe fitting with an inner diameter not less than 30mm according to claim 1, wherein in the step (2), the insulating sealing end cover is composed of an insulating sealing ring and a ring-shaped clamp installed inside the insulating sealing ring, wherein the outer diameter of the insulating sealing ring is consistent with the outer diameter of the pipe fitting, the outer diameter of the ring-shaped clamp is consistent with the inner diameter of the insulating sealing ring, and an anode parallel to the pipe fitting penetrates through the center seal of the ring-shaped clamp.
4. The method for preparing an inner wall coating of a pipe fitting with an inner diameter of not less than 30mm as claimed in claim 1, wherein in the step (2), the liquid inlet is lower than the liquid outlet.
5. The method for preparing an inner wall coating of a pipe fitting having an inner diameter of not less than 30mm as claimed in claim 1, wherein the dilute acid used in the step (3) is dilute hydrochloric acid having a mass fraction of 5% or dilute sulfuric acid having a mass fraction of 5%.
6. The method for preparing an inner wall coating of a pipe fitting with an inner diameter not less than 30mm according to claim 1, wherein in the step (4), the insulating ceramic microspheres are made of alumina or zirconia.
7. The method for preparing the inner wall coating of the pipe fitting with the inner diameter not less than 30mm as claimed in claim 1, wherein the pipe fitting is made of carbon steel, and the method for preparing the inner wall coating comprises the following steps:
(1) removing oil stains and dirt on the inner wall of the pipe fitting, wherein the cleaned inner wall of the pipe fitting can keep a continuous water film for more than 20 s;
(2) fixedly mounting insulating sealing end covers at two ends of the pipe fitting processed in the step (1), and hermetically penetrating anodes parallel to the pipe fitting in the insulating sealing end covers at the two ends, wherein a liquid inlet and a liquid outlet are respectively arranged on the insulating sealing end covers at the two ends and are connected with a circulating pump pipeline;
(3) introducing dilute acid into the pipe fitting from the liquid inlet by using a circulating pump for acid pickling activation, discharging the acid-pickled dilute acid from the liquid outlet, circulating for 5-10 min, and introducing clear water into the pipe fitting for circulating for 3-5 min;
(4) introducing a plating solution added with insulating ceramic microspheres into the pipe fitting from a liquid inlet by using a circulating pump, wherein the plating solution is prepared from 300g/L NiSO4.6H2O and 40g/L of H3BO3Prepared by switching on a power supply at 6A/dm2The current density of (a) was carried out for a 50min primary coating deposition;
(5) introducing clean water into the pipe fitting for 10min by using a circulating pump to remove residual plating solution and insulating ceramic microspheres;
(6) introducing a plating solution added with insulating ceramic microspheres into the pipe fitting from a liquid inlet by using a circulating pump, wherein the plating solution is prepared from 200g/L of NiSO4.6H2O, 70g/L of Na2WO4.2H2O and 10g/L of H3BO3Prepared by switching on a power supply at 6A/dm2The current density of (a) was carried out for a secondary coating deposition of 200 min; and introducing clear water into the pipe fitting for 5min by using a circulating pump to finally obtain the double-layer coating with the thickness of 50-75 mu m.
8. The method for preparing the coating on the inner wall of the pipe fitting with the inner diameter not less than 30mm as claimed in claim 1, wherein the pipe fitting is made of stainless steel, and the coating preparation method comprises the following steps:
(1) removing oil stains and dirt on the inner wall of the pipe fitting, wherein the cleaned inner wall of the pipe fitting can keep a continuous water film for more than 20 s;
(2) fixedly installing insulating seal end covers at two ends of the pipe fitting processed in the step (1), wherein anodes parallel to the pipe fitting are hermetically arranged in the insulating seal end covers at the two ends in a penetrating manner, liquid inlets and liquid outlets are respectively arranged on the insulating seal end covers at the two ends, and the liquid inlets and the liquid outlets are connected with a circulating pump pipeline;
(3) introducing dilute acid into the pipe fitting from the liquid inlet by using a circulating pump for acid pickling activation, discharging the acid-pickled dilute acid from the liquid outlet, circulating for 5-10 min, and introducing clear water into the pipe fitting for circulating for 3-5 min;
(4) introducing a plating solution added with insulating ceramic microspheres into the pipe fitting from a liquid inlet by using a circulating pump, wherein the plating solution is prepared from 60g/L ZnCl, 200g/L NaCl and 30g/L H3BO3Prepared by switching on a power supply at a speed of 3A/dm2Current density of 120min was performed for coating deposition;
(5) and introducing clean water into the pipe fitting for 3-5 min by using a circulating pump to obtain a coating with the thickness of 20-40 mu m.
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| CN1096946C (en) * | 1996-06-20 | 2002-12-25 | 佳能株式会社 | Method for discharging liquid by communicating bubble with atmosphere, and apparatus |
| JP3723963B2 (en) * | 2003-06-06 | 2005-12-07 | 三井金属鉱業株式会社 | Plating apparatus and film carrier tape manufacturing method for electronic component mounting |
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