JP4672391B2 - Method of anodizing pipe inner wall and structure of cathode member - Google Patents

Description

  The present invention relates to an anodizing method for aluminum and aluminum alloys, and more particularly to an anodizing method capable of forming an anodized film on an inner wall surface of a bent aluminum base alloy pipe.

In recent years, as a device for controlling the flow, a logic plate in which a complicated fluid passage is formed inside a plate member has come to be frequently used. In these logic plates, if the plate member is not corrosion resistant to the fluid flowing in the fluid passage, a corrosion prevention layer is formed on the wall surface of the fluid passage by fluororesin coating or aluminum film treatment, or the passage has corrosion resistance. A logic plate is disclosed in which a pipe is disposed so that a corrosive fluid passes through a pipe having corrosion resistance (see, for example, Patent Document 1).
In addition, in order to give the fluid passage corrosion resistance, it has also been proposed to configure the logic plate with a corrosion-resistant non-metallic material (for example, see Patent Document 2). Furthermore, although a method of anodizing the inner wall surface of the cylindrical body is disclosed, in order to prevent the film thickness of the oxide film formed on the inner surface during high-speed alumite treatment from becoming uneven, The surface of the oxide film is processed to be flat while forming an oxide film on the inner surface (see, for example, Patent Document 3), and is not applicable to anodic oxidation of the inner wall surface of a pipe having a bent portion.

JP 2002-305010 A (FIGS. 4 and 25) JP 2004-316663 A JP-A-7-90688

  However, the method for forming the anticorrosion layer by the aluminum oxide film treatment described in Patent Document 1 is the groove plate in the state before the closed passage is formed by covering the groove plate with the groove plate and the cover plate. After the anticorrosion layer is formed on the groove and the cover plate by anodic oxidation, the groove plate and the cover plate are joined to form a closed passage. The anodizing treatment uses an aluminum material as an anode, a cathode is placed facing the aluminum material that is used as the anode, and an aluminum material that is the anode is formed by oxygen generated on the anode side by electrolysis of an electrolyte solution that fills between both electrodes. Since it oxidizes to form an aluminum oxide film, in order to anodize the wall surface of the closed passage, a cathode must be placed in the closed passage, which is very difficult. Since it is practically impossible when bent, it has not been conventionally performed to anodize the wall surface of the closed passage.

In the present invention, as a method of anodizing the inner wall surface of a pipe, a wire member serving as a cathode is passed through the tube so as not to directly contact the inner wall of the tube, and a voltage is applied between the anode and the cathode using the tube member as an anode. A method for anodizing the inner wall of a pipe for anodizing the inner wall of the pipe is proposed.
According to the present invention, the wire member serving as the cathode comprises a stranded wire or a lead wire of a plurality of conductive wires, and the wire member is a pine needle-like member having a non-conductive tip member attached to at least the tip portion. Are radially attached to form a rod brush-like cathode member, and the wire member of the cathode member is supported in the tube by the pine needle-like member so as to pass through the substantially central portion of the conduit, and in the tube The electrolyte solution is filled in a state of flowing in one direction, and all the pine needle-like members are attached to the wire members that radially fall as the cathode in the flow direction of the electrolyte solution flowing in the tube. And
According to the present invention, the wire member serving as the cathode comprises a stranded wire or a lead wire of a plurality of conductive wires, and the wire member has a wide portion and an electrical insulating layer is formed at least on the surface of the tip portion. Or a bar-like cathode member attached at least in a radial manner with a thin plate-like member having a non-conductive tip member attached to the tip and a wide surface facing the electrolyte flow direction. A state in which the wire member of the cathode member is supported in the tube by a thin plate-like member having the wide portion so that it passes through a substantially central portion of the conduit, and the electrolyte flows in one direction in the tube In addition, all the thin plate-like members are attached to the wire member that becomes the cathode in a radial manner by falling in the flow direction of the electrolyte flowing in the tube.
Further, according to the present invention, the wire member serving as the cathode is composed of a plurality of conductive wire stranded wires or lead wires, and the wire member has a wide portion and an electrical insulating layer is formed on at least the surface of the tip portion. Or a bar-like cathode member attached at least in a radial manner with a thin plate-like member having a non-conductive tip member attached to the tip and a wide surface facing the electrolyte flow direction. A state in which the wire member of the cathode member is supported in the tube by a thin plate-like member having the wide portion so that it passes through a substantially central portion of the conduit, and the electrolyte flows in one direction in the tube The thin plate-like member having the wide portion is formed of a shape memory alloy in which an electrical insulating layer is formed on at least the surface of the tip portion, or at least a non-conductive tip member is attached to the tip portion. The temperature rises Characterized in that it is a member that is stored to fall in the flow direction of the electrolyte flowing through said tube and that.
According to these inventions, by forming the cathode wire member as a stranded wire, the outer peripheral surface area can be increased while giving flexibility, and the cathode member is inserted and pulled out along the conduit with the conduit being bent. Easy to do. Or when the said wire member is formed with a lead wire, a flexible wire member can be obtained. All of the pine needle-like members may be made of non-conductive material, but by making only the tip part a non-conductive material, the part other than the tip part can act as a cathode, so that the surface area of the cathode can be increased. Thus, the efficiency of the anodizing treatment can be improved.
When the pipe cross section is circular, the outer diameter of the pine needle-like member forming the rod-like brush is preferably slightly smaller than the pipe diameter. Then, the cathode member formed in the brush shape is in a floating state in the electrolyte flowing through the pipe, and the portion where the tip of the pine needle-like member strongly contacts the tube wall can be avoided and anodic oxidation is insufficient. Can be avoided.

In the present invention, pine needle-like member of said cathode member you formed radially collapsed in the flow direction of the electrolyte flowing through all the tubes. Then, if the pine needle-like member is formed to have such a strength that it bends in the flow direction due to the flow of the electrolyte, it is more reliably avoided that the tip of the pine needle-like member comes into contact with the inner wall of the tube due to this bending. Then, by inserting and pulling out the cathode member in the direction opposite to the direction in which the pine needle-shaped member is tilted, it becomes easy to insert the cathode member before anodizing and to pull out the cathode member after anodizing.

Further, in the present invention, the cathode member has a wide portion instead of the pine needle-like material, and an electrically insulating layer is formed at least on the surface of the tip portion, or at least a non-conductive tip member is provided at the tip portion. It is preferable that the attached thin plate-like member is configured in a rod-like brush shape with its wide surface falling in one direction along the linear member and radially attached to the linear member serving as the cathode . Since the electrolyte flowing through the conduit flows in a direction along the line member serving as the cathode, if the member constituting the brush portion is formed to have a wide surface, the member is directed in the downstream direction by the flow of the electrolyte. The force is greater than the case of the pine needle-like member, and it becomes easy to bend, and the buoyancy is also increased, the cathode member is easily floated in the flow of the electrolyte, and the tip of the member constituting the brush portion is in the tube. Contacting the wall can be more easily avoided. And since the wide part of the said thin plate-shaped member can be made to act as a cathode, the surface area of a cathode can be increased. The thin plate-like members may all be attached to the wire member that becomes the cathode in a radial manner by falling in the flow direction of the electrolyte flowing in the tube. As described above, when the thin plate-like member is disposed so as to fall in the flow direction of the electrolytic solution, the thin plate-like member is more easily bent in the flow direction of the electrolytic solution, and an area facing the inner wall surface of the wide surface. Increases, and the efficiency of the anodizing treatment is further improved.

Further, in the present invention, an electrical insulating layer is formed on the surface of at least the tip portion of the thin plate-like member having the wide portion attached to the wire member to be the cathode, or a non-conductive tip member is attached to at least the tip portion. The tip portion contacts the inner wall of the tube at the temperature at which the cathode member is attached, and the temperature inside the tube that is raised during the anodizing treatment is bent in one direction along the wire member that becomes the cathode, that is, the temperature. If the thin plate-like member is memorized so as to sag by rising, it is possible to reliably prevent the tip from coming into contact with the inner wall of the pipe even when the force due to the flow of the electrolyte described above is insufficient.

Further, in the present invention, when it is difficult to insert the cathode member having the brush portion into a complicated bent pipe, a wire or the like is previously passed through the pipe so that both ends come out of the pipe. In addition, one end of the cathode member is fixed to one end of the wire etc. and the other end of the wire etc. is pulled to introduce the cathode member into the conduit, and after the anodizing treatment, the cathode member is pulled out by pulling the wire etc. be able to.

Furthermore, in the present invention, when the brush portion, which is a pine needle member or a thin plate member, of the anode member is formed over the entire length, the tip of the brush portion is inserted when the cathode member is inserted into or pulled out of the conduit. When resistance increases due to contact with the inner wall of the pipe, the cathode member is formed so that the brush parts are arranged at intervals of a plurality of groups, and the brush part exists in the bent part of the pipe and in the vicinity of the front and rear thereof. However, the portion that can hold the conductive wire member of the cathode member without contacting the inner wall of the conduit substantially at the approximate center of the conduit without the need for the brush portion other than the bent portion of the conduit need not be provided with the brush portion. . Alternatively, if a conductive small-diameter bead is fixed to the wire member at an interval, the tip of the brush member is connected to the pipe line when the cathode member is inserted into the pipe line or pulled out from the pipe line. Resistance due to contact with the inner wall can be reduced. The beads are fixed to the wire member at an interval so as not to impair the flexibility of the wire member serving as a cathode. And since the said bead is electroconductive, it acts as a cathode with the wire member used as a cathode, and can increase the surface area of a cathode. Moreover, you may arrange | position the flexible tube which provided the hole of the pipe wall in the part which does not need to provide the said brush part. Since the wire rod serving as the cathode passing through the tube faces the wall surface of the pipeline serving as the anode through the hole, the portion of the pipeline wall facing the tube is also anodized.

Furthermore, in the present invention, in the case of a groove plate in which a groove serving as a fluid passage is formed and a logic plate in which the groove is covered with a cover plate to form a complicated pipe (fluid passage), the cover plate is joined to the groove plate. The cover plate can be joined in a state where the cathode member is mounted in the groove member groove before. In this case, the cathode member can be easily disposed in the groove of the groove plate, and the cathode member may be pulled out after the cover plate is joined and anodized. In particular, when the lid plate is joined to the groove plate by friction stir welding, the temperature of the groove rises due to heat generated at the time of joining. Therefore, a shape memory alloy in which a heat-resistant electric insulating layer is formed on the tip surface. It is advantageous to use a cathode member having a brush portion formed thereon.

  An anticorrosion layer can be formed on the inner wall surface by anodizing the inner wall surface of the pipeline, particularly a pipeline having a bent portion. Especially when anodized film is formed on the inner wall of the fluid passage of the logic plate, the groove and cover plate are not anodized separately, but after the groove plate and cover plate are joined to form a closed passage. The inner peripheral surface of the passage can be anodized.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

  FIG. 1 shows the method of the present invention in the case where an anodized film is formed on the inner wall surface of a straight pipe. Reference numeral 1 is a tube as a member to be treated, 2 is a cathode, 3 is an electrolytic bath, 4 is an electrolytic solution, 5 is A fixture for fixing the tube 1, 6 is an electrolyte circulation circuit, 7 is an electrolyte circulation pump, and 8 is an arrow indicating the flow direction of the electrolyte flowing in the tube. The circulation circuit 6 is provided with a nozzle 6a, and an electrolytic solution flows into the pipe 1 from the nozzle 6a. The cathode 2 is supported so as to pass through the central portion of the tube 2 by a method not shown, and the cathode 2 and the circulation circuit 6 are electrically insulated. A voltage is applied between the tube 1 serving as the anode and the cathode 2 by a method not shown. In this way, the inner wall surface of the elongated tube is anodized.

  When the tube is a bent tube, as shown in FIG. 2 (A), the electrolytic solution is put into the tube in the electrolytic solution tank in a state where the cathode member 10 is formed in a bar brush shape and penetrates the bent tube 13. The inner wall surface of the bent tube 13 is anodized by applying a voltage between the tube 13 and the cathode member 10. FIG. 2B shows an XX cross section in FIG. The cathode member 10 is formed in a bar brush shape by linearly attaching a linear member 11 serving as a cathode and a pine needle-like member 12 to the linear member 11, and the linear member 11 contacts the inner wall of the bent tube 13. Can be held to not.

  Although not clearly shown in FIG. 2, the non-conductive tip member is attached to at least the tip portion of the pine needle-like member, and even if the tip of the pine needle member contacts the inner wall surface of the tube, the cathode 11 and the anode The connection with a certain tube 13 is not conducted. The wire member 11 serving as the cathode is a stranded wire. By using a stranded wire, the surface area can be increased while maintaining flexibility. The wire member 11 is formed of a lead wire. By forming with a lead wire, it can be set as the wire member excellent in the softness | flexibility. The nonconductive tip member attached to at least the tip of the pine needle-like member is assumed to be easily bent. By doing so, the tip portion is bent by the flow of the electrolyte flowing in the tube 13, and the cathode member 10 is floated in the electrolyte flow in the tube. Contact with the inner wall surface of the tube is avoided, and a portion where the generation of the anodized film becomes insufficient is prevented. In addition, the pine needle-shaped member is made of a non-conductive material only at the tip and a conductor in the other parts, so that the conductor part acts as a cathode, so that the surface area of the cathode can be increased, and anodization treatment can be performed. Efficiency can be increased.

  FIG. 3 shows another embodiment of the cathode member. In this embodiment, all the pine needle-like members 22 are formed so as to be tilted in one direction along the line segment 21 that becomes a cathode. In this way, if the pine needle-shaped member is tilted and attached in one direction, and the cathode member 20 is inserted into and pulled out from the bent tube 23 in the direction opposite to that of the pine needle-shaped member 22, the resistance during insertion and extraction is reduced. The cathode member can be easily inserted and pulled out even in a bent tube having a small curvature radius or a complicated curvature.

  FIG. 4 shows still another embodiment. Since the pine needle-shaped member is for holding the cathode so as not to contact the inner wall surface of the tube, it is provided only in the vicinity of the bent portion of the bent tube 73 so that the cathode does not contact the inner wall surface of the tube in the straight tube portion. By the way, it is not particularly necessary to provide a pine needle-shaped member. In such a portion, as shown in FIG. 4, beads 74 made of a conductive material are attached to the cathode 1 at intervals, and a cathode member 70 made of a wire member 71, a pine needle-like member 72, and a bead 74 is inserted. By preventing the wire member 71 from coming into direct contact with the bent portion when it is pulled out, the resistance when the cathode member 70 is inserted and pulled out can be reduced. The beads 74 are fixed to the wire member 71 serving as a cathode at an interval so that the flexibility of the wire member 71 against bending is not impaired. Moreover, since the surface area of the cathode of the part can be increased by using the beads 74 as a conductive material, the efficiency of the cathode oxidation treatment can be improved.

  FIG. 5 shows still another embodiment. In this embodiment, instead of the beads 74 fixed to the wire member 71 in FIG. 4, a flexible tube 76 having a large number of holes 76a in the tube wall is arranged. As a result, the tube 76 can smoothly move through the pipeline even if it touches the inner wall of the pipeline at a sharp bend in the pipeline, and the cathode member 75 is positioned at a position where the tube 76 does not contact the inner wall of the pipeline. Stable placement. Since the wire member 71 serving as the cathode faces the inner wall of the bent tube 73 through these holes 76a, the anodic oxidation of the inner wall of the pipe line facing the tube 76 is performed without any trouble. The tube 76 is preferably formed of a non-conductive polymer material having a high flexibility and slipperiness. Needless to say, the portion for fixing the bead 74 in FIG. 4 and the portion for arranging the tube 76 in FIG. 5 may be mixed according to the shape of the duct.

  6A shows an arrangement state of the cathode member when the inner wall surface of the fluid passage of the logic plate is anodized, FIG. 6B is a YY cross section of FIG. 6A, and FIG. FIG. 5 is a partial cross-sectional view showing a state where a cover is attached to a logic plate on which a cathode member is arranged. In the case of a logic plate, the fluid passage generally has a quadrangular cross-sectional shape. 6A and 6B, reference numeral 51 is a groove plate, 52 is a groove formed in the groove plate, 53 is a lid plate joined to the groove plate 51, and 20 is shown in FIG. A similar negative electrode member is composed of a wire member 21 and a pine needle member 22. Reference numerals 54 and 55 denote holes provided in the lid plate communicating with the groove 52. In this case, the cathode member 20 is disposed in the groove 52 before the lid plate 53 is joined to the groove plate 51, and thereafter the lid plate 53 is joined. When the cathode member 20 is disposed, the groove 52 is open on the upper side, so that the cathode member 20 can be easily and appropriately disposed. When the cross-sectional shape of the groove 52 is rectangular as shown in FIG. 6B, the length of the cathode member 20 differs depending on whether the pine needle-like member extends radially on the groove side surface or on the groove upper and lower sides. Formed.

  After the cover plate is joined, the cover 100 is attached so that the line member 21 serving as the cathode passes through the hole 102 of the cover 100 as shown in FIG. 6C, and the space between the hole 102 and the line member 21 is not shown. Seal by means. 6C shows the communication hole 55 side, the cover 100 is similarly formed on the communication hole 54 side. As described above, since the portions on both ends of the line member 21 serving as the cathode passing through the hole of the cover 100 are sealed and fixed to the cover, the cathode member 21 is stably disposed in the groove 52. Then, the electrolytic solution flows into the groove 52 through the fluid passage 101 of the cover, and flows out through the fluid passage of the cover on the communication hole 54 side of the cover plate.

  In addition to 54 and 55, the lid plate 53 is often provided with a hole communicating with the groove 52. For example, in the case where there is a communication hole denoted by reference numeral 56 in FIG. 6C, a branch is made from the cathode member wire member arranged in the groove before joining the cover plate and passes through the central portion of the communication hole 56. The wire member 21a is erected. As a result, an oxide film is generated on the peripheral wall of the communication hole 56. Since the length of the communication hole is the thickness of the cover plate and is short, the wire member bends due to its flexibility when pulling out the cathode member, and does not become a great resistance when pulling out. Note that the communication holes other than the communication holes serving as the entrance and exit of the electrolyte are closed by the cover 100.

FIG. 7 shows a case where one hole is provided in the cover plate 63 and the other one is provided in the groove plate, which is formed in the groove plate 61 of the logic plate, and anodization is performed. The procedure is the same as that in FIG. In this case, the cover is attached to the back side of the groove plate 61 as well as the lid plate 63 side. The groove plate may be provided with a communication hole in addition to the communication hole 64 in the figure, and the branch line member passing through the central part of the communication is provided in the same manner as described above.
The cathode member in FIGS. 6 and 7 may be a cathode member as shown in FIGS. 2, 4 and 5, or a cathode member as shown in FIGS. Of course, it is also good.

  8A and 8B show another embodiment of the cathode member of the present invention, FIG. 8A is a side view, and FIG. 8B is a front view. In this embodiment, as shown in FIG. 8B, the member 32 attached to the line member 31 to be the cathode of the cathode member 30 is formed as a thin plate member having a wide portion on a plane perpendicular to the line member 31. ing. FIG. 8B shows three types of thin plate members 32a, 32b, and 32c, but these are examples of the shape and do not show the mounting arrangement. Although not clearly shown in the drawing, a non-conductive flexible tip member is attached to the tip portion of the thin plate member 32. Since the electrolyte flows along the line member serving as the cathode in the pipe line, the thin plate member 32 is easily deflected to the downstream side by the flow by having the wide portion.

In another embodiment shown in FIG. 9, a thin plate member 42 having a wide width portion is attached to the cathode member 40 so as to fall in one direction along the axis of the line member 41 serving as a cathode. ( That is, the wide surface of the thin plate member is attached to the linear member by being tilted to one direction along the linear member with respect to the plane perpendicular to the axis of the linear member ). If it is made to flow, the thin plate member becomes more easily bent by the flow. In this case as well, a non-conductive and flexible tip member is attached to the tip portion of the thin plate member 42.

  An inner wall surface of an elongated tube, particularly a bent tube, which has been impossible in the past can be anodized. Further, since the inner surface of the fluid passage of the logic plate can be anodized after the groove member and the lid member are joined, it is not necessary to anodize the unnecessary surface.

It is the schematic which shows the method of this invention in the case of making an anodic oxide film on the inner wall face of a straight pipe. The figure which shows the state by which the cathode member of this invention was arrange | positioned in a pipe | tube when anodizing the inner wall surface of a curved pipe, (A) is a sectional side view, (B) is a figure which shows the XX cross section in (A). It is. It is a figure which shows the state by which the cathode member by the other Example of this invention was arrange | positioned in the pipe | tube, when anodizing the inner wall surface of a bending pipe. It is a sectional side view which shows the state by which the cathode member by other Example of this invention was arrange | positioned in the pipe | tube, when anodizing the inner wall surface of a bending pipe. It is a sectional side view which shows the state by which the cathode member by other Example of this invention was arrange | positioned in the pipe | tube, when anodizing the inner wall surface of a bending pipe. It is the schematic which shows the case where the surrounding wall surface of the fluid channel | path of a logic plate is anodized by the method of this invention, (A) is a sectional side view, (B) is a YY cross section in (A), (C) is It is a figure which shows the state which attached the cover in order to flow electrolyte solution into a fluid channel | path. It is a sectional side view which shows the case where the peripheral wall surface of the fluid channel | path of the logic plate of another form is anodized by the method of this invention. It is a figure which shows another Example of the cathode member of this invention, (A) is a sectional side view, (B) is a front view. It is a sectional side view which shows another Example of the negative electrode member of this invention.

DESCRIPTION OF SYMBOLS 1 Tube 2 Cathode 3 Electrolyte tank 4 Electrolyte 5 Fixture 6 Circulating circuit 6a Nozzle 7 Circulating pump 8 Arrow line 10, 20, 30, 40, 70 Cathode member 11, 21, 31, 41, Wire member 12, 22 Matsuba Shaped member 32, 42 Thin plate member 51, 61 Groove plate 52, 62 Groove 53, 63 Cover plate 100 Cover

Claims (11)

A pipe inner wall in which a wire member serving as a cathode is passed directly into the tube so as not to contact the inner wall of the tube, an electrolyte is filled in the tube, and a voltage is applied between the anode and the cathode by using the tube member as an anode to anodize the inner wall surface of the tube In the anodizing method of
The wire member serving as the cathode is composed of a plurality of conductive wire strands or lead wires, and at least a pine needle-like member having a non-conductive tip member attached to the tip portion is radially attached to the wire member. A rod brush-like cathode member is formed, and the wire member of the cathode member is supported in the tube by the pine needle-like member so as to pass through a substantially central portion of the pipe line, and the electrolyte solution is unidirectional in the tube. An anode of an inner wall of a pipe, which is filled in a flowing state, and wherein all of the pine needle-like members are attached to a wire member that radially falls as the cathode in a flow direction of the electrolyte flowing in the pipe Oxidation method. A pipe inner wall in which a wire member serving as a cathode is passed directly into the tube so as not to contact the inner wall of the tube, an electrolyte is filled in the tube, and a voltage is applied between the anode and the cathode by using the tube member as an anode to anodize the inner wall surface of the tube In the anodizing method of
The wire member serving as the cathode comprises a stranded wire or a lead wire of a plurality of conductive wires, and the wire member has a wide portion, and an electric insulating layer is formed on the surface of at least the tip, or at least the tip A thin plate-like member with a non-conductive tip member attached to the part is attached radially so that its wide surface faces the flow direction of the electrolyte, and a rod brush-like cathode member is formed, The wire member of the cathode member is supported in the tube by a thin plate-like member having the wide portion so that it passes through the substantially central portion of the pipe line, and the electrolyte solution is filled in a state of flowing in one direction. In addition, the thin plate-like member is attached to the wire member that becomes the cathode in a radial manner by falling down in the flow direction of the electrolyte flowing in the pipe. A pipe inner wall in which a wire member serving as a cathode is passed directly into the tube so as not to contact the inner wall of the tube, an electrolyte is filled in the tube, and a voltage is applied between the anode and the cathode by using the tube member as an anode to anodize the inner wall surface of the tube In the anodizing method of
The wire member serving as the cathode comprises a stranded wire or a lead wire of a plurality of conductive wires, and the wire member has a wide portion, and an electric insulating layer is formed on the surface of at least the tip, or at least the tip A thin plate-like member with a non-conductive tip member attached to the part is attached radially so that its wide surface faces the flow direction of the electrolyte, and a rod brush-like cathode member is formed, The wire member of the cathode member is supported in the tube by a thin plate-like member having the wide portion so that it passes through the substantially central portion of the pipe line, and the electrolyte solution is filled in a state of flowing in one direction. In addition, the thin plate-like member having the wide portion is formed of a shape memory alloy in which an electrical insulating layer is formed at least on the surface of the tip portion, or at least a non-conductive tip member is attached to the tip portion, and the temperature rises. Then in the pipe Anodizing method of the pipe inner wall, characterized in that the electrolyte is a member that is stored to fall in the flow direction of the flow.   One end of the cathode member is fixed to one end of a guide wire previously passed through the tube, and the other end of the wire is pulled into the tube to introduce the guide wire after the inner wall surface of the tube is anodized. 3. The method for anodizing a pipe inner wall according to claim 1, wherein the pipe is pulled out by pulling.   After the cathode member is disposed in a groove formed in the groove plate of the logic plate, a lid plate is joined, and after the inner wall surface formed by the groove and the lid plate covering the groove is anodized, the cathode member is 4. The method for anodizing a pipe inner wall according to any one of claims 1 to 3, wherein the pipe is pulled out.   A pine needle-like member having a non-conductive member attached to at least a tip thereof is attached to a wire member serving as a cathode made of a plurality of stranded wires or lead wires of a plurality of conductive wires. A cathode member for an inner wall surface anodizing treatment, characterized in that all of the pine needle members are tilted in one direction along the wire member serving as the cathode and are radially attached to the wire member serving as the cathode. A wire member serving as a cathode made of a plurality of stranded wires or lead wires of a plurality of conductive wires has a wide portion, and an electrically insulating layer is formed at least on the surface of the tip portion, or at least a tip portion that is non-conductive at the tip portion pipe wall is thin plate member mounted, characterized in that the wide surface was constructed attached to the rod-shaped brush-like line member serving as the cathode radially collapsed in one direction along the line member Cathode member for anodizing treatment.   The thin plate-like member having the wide portion is formed of a shape memory alloy in which an electrically insulating layer is formed at least on the surface of the tip portion, or at least a non-conductive tip member is attached to the tip portion. The cathode member according to claim 7, wherein the cathode member is stored so as to fall in one direction along the wire member.   The pine needle-like member group or the thin plate-like member group forming the brush portion of the cathode member configured in the rod brush shape is formed with a plurality of groups, spaced apart from each other. The cathode member according to claim 1.   A plurality of pine needle-like member groups or thin plate member groups forming the brush portion of the cathode member configured in the shape of the bar brush are formed at intervals, and the line member serving as the cathode between these brush portion groups The cathode member according to any one of claims 6 to 8, wherein conductive small-diameter beads are fixed at intervals.   A plurality of pine needle-like member groups or thin plate member groups forming the brush portion of the cathode member configured in the shape of the bar brush are formed at intervals, and the line member serving as the cathode between these brush portion groups The cathode member according to any one of claims 6 to 8, wherein a flexible tube having a hole in the tube wall is disposed.

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