JP6116332B2 - Sacrificial anode panel and sacrificial anode panel construction method - Google Patents

Description

  The present invention relates to a sacrificial anode panel and a method for constructing the sacrificial anode panel for corrosion protection of steel materials.

  There is a sacrificial member for roofs that is placed at the boundary between the tile roof and the copper roof under the water, and further protects metal roofs, valley plates, rain gutters, etc. located under the water from acid rain. (See Patent Document 1).

  Regarding corrosion protection of steel materials, Patent Document 2 has a magnet that is fixed to the steel material, and the sacrificial anode material body is made of a metal material that is electrically base and porous compared to the steel material. The technology of a sacrificial anode panel in which a magnet is installed on a contact surface where the sacrificial anode material main body and the steel material come into contact with each other is described.

Japanese Patent Laid-Open No. 11-124960 JP 2011-026673 A

  Steel materials such as bridges and pipes for chemical plants are installed on the assumption that they will be used for a long time. Coating or metal spraying is effective for preventing rust or delaying the progress of corrosion of steel. And sufficient surface treatment is required for coating or metal spraying.

  When a surface treatment is applied to a steel material having rust on the surface, and coating or metal spraying is performed, rust may occur again. In order to suppress the progress of rust, the sacrificial anode described in Patent Document 1 or 2 described above is effective.

  The technique described in Patent Document 1 describes that a large number of slit holes are provided at regular intervals, thereby increasing the contact area between rainwater and a zinc plate and providing a more prominent anti-corrosion effect. However, the technique described in Patent Document 1 describes a sacrificial member for draining, and does not consider holding moisture in order to suppress the progress of rust.

  The technique described in Patent Document 2 describes that the sacrificial anode material body can absorb and hold liquid by capillary action. However, the sacrificial anode panel is required to retain moisture for a longer time in order to suppress the progress of rust.

  The present invention has been made in view of the above, and an object of the present invention is to provide a sacrificial anode panel that can retain moisture for a longer time and a sacrificial anode panel construction method in order to suppress the progress of rust or corrosion products. To do.

  In order to solve the above-described problems and achieve the object, the sacrificial anode panel according to the present invention includes a mounting surface that includes a metal material having a higher ionization tendency than iron and is attached to the steel material through a moisturizing material having moisturizing properties. A plate member having an outer surface opposite to the mounting surface, the plate having a plurality of moisture introduction holes penetrating between the mounting surface and the outer surface, and appearing on the outer surface At least one of the opening on the outer surface side of the hole and the mounting surface side opening of the moisture introduction hole appearing on the mounting surface has a portion that does not overlap the other when viewed in plan. .

  With this structure, moisture can be retained by the moisturizing material and the inner wall of the moisture introduction hole. For this reason, even if the moisture content of the moisturizing material decreases, the moisture is supplied from the moisture introduction hole. As a result, the sacrificial anode panel can retain moisture for a longer time to suppress the progression of rust or corrosion products.

  As a desirable mode of the present invention, it is preferable that an inner wall of the moisture introduction hole is inclined with respect to the thickness direction of the plate material. With this structure, the sacrificial anode panel can easily introduce components such as rainwater from the outside. For this reason, even if the moisture content of the moisturizing material decreases, the moisture is supplied from the moisture introduction hole. As a result, the sacrificial anode panel can retain moisture for a longer time to suppress the progression of rust or corrosion products.

  In order to solve the above-described problems and achieve the object, the sacrificial anode panel according to the present invention includes a mounting surface that includes a metal material having a higher ionization tendency than iron and is attached to the steel material through a moisturizing material having moisturizing properties. A plate member having an outer surface opposite to the mounting surface, having a plurality of moisture introduction holes penetrating between the mounting surface and the outer surface, and when attached to the steel material, The moisture introduction hole is inclined upward in the vertical direction from the mounting surface toward the outer surface.

  With this structure, the sacrificial anode panel can easily introduce components such as rainwater from the outside. For this reason, even if the moisture content of the moisturizing material decreases, the moisture is supplied from the moisture introduction hole. As a result, the sacrificial anode panel can retain moisture for a longer time to suppress the progression of rust or corrosion products.

  As a desirable aspect of the present invention, it is preferable that the plate member includes a marker indicating a direction in which the plate member is directed upward in the vertical direction when the plate member is attached. With this structure, an operator can easily attach the sacrificial anode panel to the steel material.

  As a desirable mode of the present invention, it is preferable that the mounting surface side opening has a larger area than the outer surface side opening when seen in a plan view. With this structure, the operator does not have to worry about the mounting direction of the sacrificial anode panel with respect to the steel material, and mounting becomes easy.

  In order to solve the above-described problems and achieve the object, the sacrificial anode panel according to the present invention includes a mounting surface that includes a metal material having a higher ionization tendency than iron and is attached to the steel material through a moisturizing material having moisturizing properties. A plate member having an outer surface opposite to the mounting surface, and having a plurality of moisture introduction holes penetrating between the mounting surface and the outer surface, The cross-sectional area increases from the surface toward the mounting surface.

  With this structure, the operator does not have to worry about the mounting direction of the sacrificial anode panel with respect to the steel material, and mounting becomes easy. Further, moisture can be retained by the moisturizing material and the inner wall of the moisture introduction hole. For this reason, even if the moisture content of the moisturizing material decreases, the moisture is supplied from the moisture introduction hole. As a result, the sacrificial anode panel can retain moisture for a longer time to suppress the progression of rust or corrosion products.

  As a desirable mode of the present invention, it is preferable that the outer surface side opening has a larger area than the attachment surface side opening in a plan view. With this structure, the sacrificial anode panel has more space for storing more water and can hold more water.

  In order to solve the above-described problems and achieve the object, the sacrificial anode panel according to the present invention includes a mounting surface that includes a metal material having a higher ionization tendency than iron and is attached to the steel material through a moisturizing material having moisturizing properties. A plate member having an outer surface opposite to the mounting surface, the plate having a plurality of moisture introduction holes penetrating between the mounting surface and the outer surface. A cross-sectional area increases from a surface toward the outer surface.

  With this structure, the sacrificial anode panel has more space for storing more water and can hold more water. As a result, the sacrificial anode panel can retain moisture for a longer time to suppress the progression of rust or corrosion products.

  As a desirable mode of the present invention, it is preferable that the plurality of moisture introduction holes are arranged in a staggered manner. With this structure, a large amount of moisture such as rainwater flowing down from above in the vertical direction can be guided to the moisture introduction hole.

  As a desirable mode of the present invention, the water introduction hole is preferably a long hole in a plan view. With this structure, a large amount of moisture such as rainwater flowing down from above in the vertical direction can be guided to the moisture introduction hole.

  As a desirable mode of the present invention, it is preferable that the outer surface has a groove portion connected to the moisture introduction hole. With this structure, a large amount of moisture such as rain water around the moisture introduction hole can be guided to the moisture introduction hole.

  As a desirable aspect of the present invention, the metal material preferably contains at least one of zinc, aluminum, and magnesium. This structure makes the sacrificial anode panel easier to ionize than iron. As a result, it is possible to suppress corrosion of the steel material mainly composed of iron.

  As a desirable aspect of the present invention, the metal material is preferably an aluminum alloy containing zinc. This structure makes the sacrificial anode panel easier to ionize than iron. As a result, it is possible to suppress corrosion of the steel material mainly composed of iron. Further, the sacrificial anode panel can suppress corrosion products other than electrolytic corrosion, and can extend the life of the sacrificial anode panel.

  As a desirable aspect of the present invention, the plate material is preferably cast. With this structure, the sacrificial anode panel can suppress corrosion products other than electrolytic corrosion and extend the life of the sacrificial anode panel.

  As a desirable aspect of the present invention, the plate material is preferably porous including voids. With this structure, it is possible to retain moisture in the voids included in the sacrificial anode panel.

  As a desirable mode of the present invention, it is preferable that the plate material is curved along the surface of the steel material. With this structure, the sacrificial anode panel can also be attached to a curved surface.

  In order to solve the above-described problems and achieve the object, the sacrificial anode panel construction method of the present invention includes a procedure for performing a cleaning process for removing rust or corrosion products on the surface of the steel material, and a cleaning process. A procedure for determining the mounting direction of the sacrificial anode panel according to any one of claims 4 to 7, and a procedure for fixing the sacrificial anode panel in the mounting direction determined on the steel material, with respect to the surface. , Including.

  By this method, the sacrificial anode panel can easily introduce components such as rainwater from the outside. For this reason, even if the moisture content of the moisturizing material decreases, the moisture is supplied from the moisture introduction hole. As a result, the sacrificial anode panel can retain moisture for a longer time to suppress the progression of rust or corrosion products.

  ADVANTAGE OF THE INVENTION According to this invention, in order to suppress progress of a rust or a corrosion product, the construction method of the sacrificial anode panel which can hold | maintain a water | moisture longer, and a sacrificial anode panel can be provided.

FIG. 1 is an explanatory view showing an example in which a sacrificial anode panel according to Embodiment 1 is installed on a steel material. FIG. 2 is a plan view of the sacrificial anode panel according to the first embodiment. 3 is a cross-sectional view taken along line A1-A2 shown in FIG. 2 when the sacrificial anode panel according to Embodiment 1 is attached to a steel material. 4 is a cross-sectional view taken along line B1-B2 shown in FIG. 2 when the sacrificial anode panel according to Embodiment 1 is attached to a steel material. FIG. 5 is a flowchart for explaining a construction procedure in which the sacrificial anode panel according to the first embodiment is installed on a steel material. 6 is a cross-sectional view taken along line A1-A2 of FIG. 2 when the sacrificial anode panel according to the first modification of the first embodiment is attached to a steel material. FIG. 7 is an explanatory diagram for explaining a method of manufacturing the sacrificial anode panel according to the first modification of the first embodiment. FIG. 8 is a plan view of a sacrificial anode panel according to the second modification of the first embodiment. 9 is a cross-sectional view taken along line C1-C2 of FIG. 8 when the sacrificial anode panel according to the second modification of the first embodiment is attached to a steel material. 10 is a plan view of a sacrificial anode panel according to Modification 3 of Embodiment 1. FIG. FIG. 11 is a partially enlarged plan view of the sacrificial anode panel according to the fourth modification of the first embodiment. FIG. 12 is a partially enlarged plan view of a sacrificial anode panel according to Modification 5 of Embodiment 1. FIG. 13 is an explanatory view showing an example in which the sacrificial anode panel according to Embodiment 2 is installed on a steel material. FIG. 14 is a plan view of a sacrificial anode panel according to the second embodiment. 15 is a cross-sectional view taken along line D1-D2 of FIG. 14 when the sacrificial anode panel according to Embodiment 2 is attached to a steel material. FIG. 16 is a partially enlarged plan view of a sacrificial anode panel according to Modification 1 of Embodiment 2. 17 is a cross-sectional view taken along line E1-E2 of FIG. 18 is a cross-sectional view taken along line F1-F2 of FIG. FIG. 19 is an explanatory diagram illustrating another example in which the sacrificial anode panel according to the second modification of the second embodiment is installed on a steel material.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined.

(Embodiment 1)
FIG. 1 is an explanatory view showing an example in which a sacrificial anode panel according to Embodiment 1 is installed on a steel material. The steel material 6 is, for example, a girder for a bridge, and is an H-shaped steel including a lower flange (projection edge) 6NS, an upper flange 6US, and a web (belt plate) 6WS. As long as the steel material 6 is a steel structure, the steel material 6 is not limited to the H-shaped steel but may be an I-shaped steel or a steel material such as a pipe of a chemical plant. In the first embodiment, the vertical direction is the Z direction, and the plane orthogonal to the vertical direction is represented by an XY plane defined by the X direction and the Y direction. In FIG. 1, the steel material 6 has a longitudinal direction as the Y direction, a short direction as the X direction, and a web 6WS extending in the Z direction.

  The steel material 6 is formed of a metal material such as a general structural rolled steel material (JIS standard: SS400, etc.) having iron (Fe) as a main component. For this reason, there are places where the steel material 6 is likely to corrode (where rust is likely to be generated) due to corrosion factors such as rainwater, atmospheric moisture, and sea breeze containing salt. The steel material 6 is installed on the assumption that it will be used for a long time. For this reason, coating or metal spraying is applied to a place where corrosion is likely to occur (where rust is likely to occur) in order to prevent corrosion of the steel material 6 or to delay the progress of corrosion. And sufficient surface treatment is required for coating or metal spraying. However, in a place where rust is progressing, it takes too much man-hours to completely remove rust with kelen or blast.

  The sacrificial anode panel 1 according to Embodiment 1 can delay the progress of corrosion of the steel material 6 by being attached to the surface of the web 6WS. The sacrificial anode panel 1 includes a metal material that has a higher ionization tendency (electrically base) than iron (Fe), which is the main component of the steel material 6. Specifically, the metal material having a higher ionization tendency (electrically base) than iron (Fe) is zinc, aluminum, magnesium, or an alloy thereof. The sacrificial anode panel 1 according to Embodiment 1 is, for example, an AlZn alloy that contains 80% by mass of Al, 20% by mass of Zn, and may contain inevitable impurities. When the sacrificial anode panel 1 according to Embodiment 1 is an AlZn alloy, the Al component suppresses self-corrosion not caused by electrolytic corrosion as compared with Zn, and the life of the sacrificial anode panel 1 according to Embodiment 1 is reduced. It can extend and suppress the generation of corrosion products not caused by electrolytic corrosion. Note that the AlZn alloy is an example, and the sacrificial anode panel 1 according to Embodiment 1 has a higher ionization tendency than iron (Fe), which is the main component of the steel material 6, even if it is a metal material other than the AlZn alloy (electricity). Any metallic material may be used.

  Next, the sacrificial anode panel 1 according to Embodiment 1 will be described with reference to FIGS. FIG. 2 is a plan view of the sacrificial anode panel according to the first embodiment. 3 is a cross-sectional view taken along line A1-A2 shown in FIG. 2 when the sacrificial anode panel according to Embodiment 1 is attached to a steel material. 4 is a cross-sectional view taken along line B1-B2 shown in FIG. 2 when the sacrificial anode panel according to Embodiment 1 is attached to a steel material.

  As shown in FIGS. 2 and 3, the sacrificial anode panel 1 is a plate-like member having a predetermined thickness (for example, 5 mm), and is attached to the surface of the web 6WS via the moisturizing material 3.

  The moisturizing material 3 may be any material that is excellent in water retention and moisture retention. The moisturizing material 3 is formed of, for example, a material having hygroscopicity and water absorption, such as a sheet made of polyvinyl alcohol, a polymer water-absorbing gel, or a material containing voids such as fibers. Moreover, it is desirable that the moisturizing material 3 has a deformability that deforms following unevenness or a welded portion. The thickness of the moisturizing material 3 is 3 mm, for example.

  The sacrificial anode panel 1 according to the first embodiment has a plurality of moisture introduction holes 2 penetrating between the mounting surface 1BS facing the moisturizing material 3 and the outer surface 1FS opposite to the mounting surface 1BS. Yes. The diameter of the water introduction hole 2 is, for example, φ6.5 mm. As shown in FIG. 2, the sacrificial anode panel 1 is provided with fixing holes 4 </ b> A and 4 </ b> B for attachment to the steel material 6 in addition to the moisture introduction hole 2.

  The moisture introduction hole 2 is opened with a tool such as a drill so as to be drilled obliquely with respect to the outer surface 1FS of the sacrificial anode panel 1. As shown in FIGS. 2 and 3, the outer surface side opening 2FSE of the moisture introduction hole 2 appearing on the outer surface 1FS and the attachment surface side opening 2BSE of the moisture introduction hole 2 appearing on the attachment surface 1BS are planar. When viewed (when viewed from the thickness direction of the sacrificial anode panel 1), the position is shifted. The outer surface side opening 2FSE and the attachment surface side opening 2BSE have the same area. For this reason, the sacrificial anode panel 1 according to Embodiment 1 has a portion in which the outer surface side opening 2FSE does not overlap the attachment surface side opening 2BSE in a plan view. In the sacrificial anode panel 1 according to the first embodiment, it is only necessary that the outer surface side opening 2FSE does not completely coincide with the attachment surface side opening 2BSE in a plan view. The outer surface side opening 2FSE partially overlaps the mounting surface side opening 2BSE or does not completely overlap in a plan view. In addition, although the planar view shape of the outer surface side opening part 2FSE illustrates circular, it can be changed suitably. For example, the planar view shape of the front-side opening 2FSE may be a polygon such as a triangle or a quadrangle.

  When the sacrificial anode panel 1 according to the first embodiment is attached to the web 6WS, the attachment surface side opening 2BSE is attached so as to be lower in the vertical direction than the outer surface side opening 2FSE. Therefore, the moisture introduction hole 2 has an angle α formed by the thickness direction Fp of the sacrificial anode panel 1 (a virtual line parallel to the normal of the mounting surface 1BS or the outer surface 1FS) and the inner wall 2P of the moisture introduction hole 2. The inner wall 2P is inclined with respect to the thickness direction Fp. When the sacrificial anode panel 1 according to the first embodiment is attached to the web 6WS, the inner wall 2P from the attachment surface 1BS toward the outer surface 1FS is inclined upward in the vertical direction (Z direction). As a result, the moisture introduction hole 2 has a storage space in which moisture W such as rainwater can be retained by the moisture retaining material 3 and the inner wall 2P of the moisture introduction hole 2. The thickness direction Fp of the sacrificial anode panel 1 is parallel to the normal line of the mounting surface 1BS or the outer surface 1FS.

  The above-described moisturizing material 3 can maintain the state in which electricity easily flows from the steel material 6 to the sacrificial anode panel 1 because rainwater or the like wets the sacrificial anode panel 1 because the rainwater or the like can be retained. . Since the sacrificial anode panel 1 according to the first embodiment holds the moisture W supplied through the moisture introduction hole 2 by rainwater or the like, the moisture retaining material 3 can absorb the moisture W. And since sacrificial anode panel 1 itself turns into an anode with the flow of electricity, the steel material 6 can be corrosion-protected. In particular, if the moisture retaining material 3 is a material that is easily deformed, the state of electrical continuity with the surface of the web 6WS is improved, and the anticorrosion effect can be improved.

  Fixing holes 4A and 4B shown in FIG. 2 are through-holes through which stud bolts 5 which are conductive metal rods shown in FIG. The fixing holes 4A and 4B are opened in parallel with the thickness direction Fp of the sacrificial anode panel 1 shown in FIG. The stud bolt 5 is attached to the surface of the steel material 6 by fillet welding with a joint material 5 m of a weld joint. When the opening diameter of the fixed hole 4A is 4R, the fixed hole 4B is preferably opened so as to have an opening width 4W longer than the opening diameter 4R. With this structure, the position of the stud bolt 5 that passes through the fixing hole 4B is shifted, so that the sacrificial anode panel 1 has the moisturizing material 3 in a state in which the variation in the position of the stud bolt 5 that is fillet welded at two locations is absorbed. Is attached to the surface of the web 6WS.

  The stud bolt 5 passes through the moisture retaining material 3 and the fixing hole 4A (4B) of the sacrificial anode panel 1 and is fastened by a nut 5n screwed into a male screw (not shown) on the outer peripheral surface. A conductive washer 5w is interposed between the nut 5n and the sacrificial anode panel 1. The washer 5w stabilizes the fixed state of the moisturizing material 3 and the sacrificial anode panel 1. The washer 5w and the outer surface 1FS of the sacrificial anode panel 1 are in close contact with each other and are electrically connected. And the insulating silicone resin 5b is apply | coated to the inner wall of fixing hole 4A (4B), and the stud bolt 5 and the inner wall of fixing hole 4A (4B) are insulated.

The stud bolt 5, the washer 5w, and the nut 5n are, for example, a metal material of general structural rolled steel (JIS standard: SS400, etc.), and have conductivity. For this reason, the stud bolt 5 becomes a conductive path for electrons e ⁻ , and a current flows between the steel material 6 and the sacrificial anode panel 1. Since the stud bolt 5 and the inner wall of the fixing hole 4A (4B) are insulated, corrosion of the inner wall of the fixing hole 4A (4B) is suppressed. In addition, the electrons e move from the surface of the steel material 6 (web 6WS) toward the mounting surface 1BS facing the moisturizing material 3, and the electrolytic corrosion of the sacrificial anode panel 1 proceeds. For example, zinc contained in the sacrificial anode panel 1 is ionized as shown in the following reaction formula (1).

Zn → Zn ²⁺ + 2e ⁻ (1)

And Zn < ²⁺ > elutes in the water | moisture content W which the moisturizing material 3 contains, and the electron e moves. Thereby, corrosion of iron (Fe) which is the main component of the steel material 6 is suppressed.

  Moreover, it is preferable that the sacrificial anode panel 1 which concerns on Embodiment 1 is given the silicone sealing process which covers the washer 5w and the nut 5n with the silicone resin 5a. For this reason, the sacrificial anode panel 1 which concerns on Embodiment 1 can improve maintainability. In addition, although the sacrificial anode panel 1 which concerns on Embodiment 1 is fixed to the steel material 6 with the stud bolt 5, a fixing means is not restricted to the stud bolt 5, You may use the magnet of patent document 2. FIG.

  FIG. 5 is a flowchart for explaining a construction procedure in which the sacrificial anode panel according to the first embodiment is installed on a steel material. As shown in FIG. 5, the worker first investigates the state of rust or corrosion on the steel material 6 and selects an application location where the sacrificial anode panel 1 is installed on the steel material 6 (step S1).

  An operator performs the cleaning process which removes a rust or a corrosion product about the application location selected by procedure S1 (procedure S2). For example, even if the operator does not completely remove rust by means of keren or blasting, the worker may remove the rust to some extent and treat the surface of the steel material 6 to such an extent that the stud bolt 5 can be welded. Next, the operator attaches the stud bolt 5 by fillet welding (procedure S3).

  The operator passes the stud bolt 5 through the fixing hole 4A and the fixing hole 4B, and the sacrificial anode panel 1 so that the outer surface side opening 2FSE is above the mounting surface side opening 2BSE in the vertical direction (Z direction). Is determined (step S4). The sacrificial anode panel 1 has a marker 7 that indicates a direction in which the sacrificial anode panel 1 is directed upward in the vertical direction when the sacrificial anode panel 1 is attached, and the operator determines the mounting direction of the sacrificial anode panel 1 using the marker 7 as a clue (step S4). It may be. With this structure, the operator can efficiently determine the mounting direction of the sacrificial anode panel 1.

  The operator passes the washer 5w and the nut 5n through the stud bolt 5, and screws and fixes the nut 5n (procedure S). By this procedure, the steel material 6 and the moisturizing material 3 and the moisturizing material 3 and the sacrificial anode panel 1 can be narrowed and brought into close contact with each other.

  Alternatively, a moisturizing material 3 having a larger area than the area of the sacrificial anode panel 1 may be installed, and this moisturizing material 3 may cover a wide range of corroded portions. With this configuration, corrosion protection can be performed in a wider range than the area of the sacrificial anode panel 1. That is, since electricity flows from the corroded portion in contact with the moisturizing material 3 to the sacrificial anode panel 1 via the moisturizing material 3, the anticorrosion effect can be obtained in a wide range.

  Moreover, the sacrificial anode panel 1 may be porous having, for example, 10 to 40% voids with respect to the entire volume. The porous void has a property (water retention) capable of retaining a liquid such as rainwater by a capillary phenomenon. For this reason, water absorbency, such as rain water, and hygroscopicity can be improved. When the sacrificial anode panel 1 is a porous material, the sacrificial anode panel 1 is formed by powder sintering.

  The sacrificial anode panel 1 may be formed by casting. The porous material can also retain moisture on the outer surface 1FS of the sacrificial anode panel 1. And since the porous material has a large external surface area of the outer surface 1FS, that is, the surface area of the portion not in contact with the steel material 6 or the moisturizing material 3, there is a possibility that self-corrosion not caused by electrolytic corrosion occurs on the outer surface 1FS side. is there. In contrast, the cast sacrificial anode panel 1 suppresses self-corrosion that is not caused by electrolytic corrosion as compared with the porous material, and the life of the sacrificial anode panel 1 according to Embodiment 1 is extended and is not caused by electrolytic corrosion. The generation of corrosion products can be suppressed. The diameter of the water introduction hole 2 is preferably φ3 mm or more. When the diameter of the water introduction hole 2 is larger than φ3 mm, the external surface area of the outer surface 1FS becomes small. As a result, the cast sacrificial anode panel 1 can further suppress the possibility of self-corrosion not caused by electrolytic corrosion on the outer surface 1FS side. In addition, since the cast sacrificial anode panel 1 does not have voids in the sacrificial anode panel 1 itself as compared with the porous material, moisture W such as rain water as shown in FIG. The inner wall 2P of the hole 2 can be held. The cast sacrificial anode panel 1 can efficiently supply the moisture W stored in comparison with the porous material to the moisturizing material 3.

  As described above, the sacrificial anode panel 1 according to Embodiment 1 includes a mounting surface 1BS that includes a metal material that has a higher ionization tendency than iron and is attached to the steel material 6 via the moisturizing material 3 having moisture retention. A plate material having a surface 1BS and an outer surface 1FS opposite to the surface 1BS, and a plurality of moisture introduction holes 2 penetrating between the mounting surface 1BS and the outer surface 1FS are formed, and moisture introduction that appears on the outer surface 1FS is performed. At least one of the outer surface side opening 2FSE of the use hole 2 and the attachment surface side opening 2BSE of the moisture introduction hole 2 appearing on the attachment surface 1BS has a portion that does not overlap the other when seen in a plan view.

  With this structure, moisture W such as rainwater as shown in FIG. 3 can be retained by the moisture retaining material 3 and the inner wall 2P of the moisture introduction hole 2. For this reason, even if the moisture content of the moisturizing material 3 decreases, the moisture W is supplied from the moisture introduction hole 2. As a result, the sacrificial anode panel 1 according to the first embodiment can hold the moisture W for a longer time in order to suppress the progress of rust or corrosion products.

(Modification 1 of Embodiment 1)
6 is a cross-sectional view taken along line A1-A2 of FIG. 2 when the sacrificial anode panel according to the first modification of the first embodiment is attached to a steel material. FIG. 7 is an explanatory diagram for explaining a method of manufacturing the sacrificial anode panel according to the first modification of the first embodiment. The same members as those in the first embodiment described above are denoted by the same reference numerals, and redundant description is omitted.

  The moisture introduction hole 2A shown in FIG. 6 has the same shape as the moisture introduction hole 2 shown in FIG. The sacrificial anode panel 1 according to the first modification of the first embodiment has a portion where the outer surface side opening 2FSE does not overlap with the attachment surface side opening 2BSE in a plan view. The moisture introduction hole 2A has an angle α formed by the thickness direction Fp of the sacrificial anode panel 1 (a virtual line parallel to the normal of the mounting surface 1BS or the outer surface 1FS) and the inner wall 2P of the moisture introduction hole 2A. The inner wall 2P is inclined with respect to the thickness direction Fp. As shown in FIG. 7, in the moisture introduction hole 2A, the inner wall 2Q of the moisture introduction hole 2A is a recess on the mounting surface 1BS side. As shown in FIG. 7, the cast sacrificial anode panel 1 is cast with a mold 8 having a protrusion 8P smaller than the thickness of the sacrificial anode panel 1 to be cast. A tool such as a drill is formed so that a part of the recess formed after the mold peeling Fn becomes the inner wall 2Q, and the moisture introduction hole 2A is bored in the oblique direction Fd with respect to the outer surface 1FS of the sacrificial anode panel 1 so as to leave the recess. Can be opened.

  As described above, the cast sacrificial anode panel 1 can hold moisture W such as rainwater as shown in FIG. 6 between the moisture retaining material 3 and the inner wall 2Q of the moisture introduction hole 2A. As a result, in the moisture introduction hole 2A, the storage space is widened, and the amount of moisture W retained can be increased.

(Modification 2 of Embodiment 1)
FIG. 8 is a plan view of a sacrificial anode panel according to the second modification of the first embodiment. 9 is a cross-sectional view taken along line C1-C2 of FIG. 8 when the sacrificial anode panel according to the second modification of the first embodiment is attached to a steel material. The same members as those in the first embodiment described above are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 8 and FIG. 9, the moisture introduction hole 2B has a cross section (mounting surface 1BS or outer surface perpendicular to the direction from the outer surface 1FS toward the mounting surface 1BS, that is, from the outer surface 1FS to the mounting surface 1BS. The cross-sectional area of the cross section when cut by a plane orthogonal to 1FS is widened. If the moisture introduction hole 2B has a circular outer shape, for example, the diameter increases from the outer surface 1FS toward the mounting surface 1BS. Therefore, when viewed in plan from the outer surface side opening 2FSE of the moisture introduction hole 2B appearing on the outer surface 1FS and the attachment surface side opening 2BSE of the moisture introduction hole 2B appearing on the attachment surface 1BS (sacrificial anode panel) 1), the area is large. And the sacrificial anode panel 1 which concerns on the modification 2 of Embodiment 1 has a part which the attachment surface side opening part 2BSE does not overlap with the outer surface side opening part 2FSE seeing in planar view.

  And the sacrificial anode panel 1 which concerns on the modification 2 of Embodiment 1 is attached to the position where the Z direction lowest end of the attachment surface side opening part 2BSE is lower than the Z direction lowest end of the outer surface side opening part 2FSE. . Therefore, an angle α is formed between the thickness direction Fp of the sacrificial anode panel 1 (a virtual line parallel to the normal line of the mounting surface 1BS or the outer surface 1FS) and the inner wall 2P of the moisture introduction hole 2B. A storage space capable of holding W by the moisturizing material 3 and the inner wall 2P of the moisture introduction hole 2B is formed.

  And the sacrificial anode panel 1 which concerns on the modification 2 of Embodiment 1 and the thickness direction Fp (virtual line parallel to the normal line of the mounting surface 1BS or the outer surface 1FS) of the sacrificial anode panel 1 and whichever direction it attaches In addition, an angle α formed with the inner wall 2P of the moisture introduction hole 2B is formed, and a storage space in which moisture W such as rain water can be held by the moisture retaining material 3 and the inner wall 2P of the moisture introduction hole 2B is formed. As a result, the operator can attach the sacrificial anode panel 1 according to the second modification of the first embodiment to the surface of the web 6WS without worrying about the attaching direction.

(Modification 3 of Embodiment 1)
10 is a plan view of a sacrificial anode panel according to Modification 3 of Embodiment 1. FIG. The same members as those in the first embodiment described above are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 10, the moisture introduction hole 2 </ b> C is opened with a tool such as a drill so as to be drilled obliquely with respect to the outer surface 1 </ b> FS of the sacrificial anode panel 1. For this reason, as shown in FIG. 10, the outer surface side opening 2FSE that is the inner wall of the moisture introduction hole 2C that appears on the outer surface 1FS and the attachment surface side opening that is the inner wall of the moisture introduction hole 2C that appears on the attachment surface 1BS. The portion 2BSE is displaced in a plan view (when viewed from the thickness direction of the sacrificial anode panel 1). The outer surface side opening 2FSE and the attachment surface side opening 2BSE have the same area. For this reason, the sacrificial anode panel 1 according to the third modification of the first embodiment has a portion where the outer surface side opening 2FSE does not overlap the attachment surface side opening 2BSE in a plan view. As shown in FIG. 10, the position of the attachment surface side opening 2BSE is shifted in multiple directions (four directions in FIG. 10) with respect to the outer surface side opening 2FSE. For this reason, the operator can attach the sacrificial anode panel 1 according to the third modification of the first embodiment to the surface of the web 6WS without worrying about the attaching direction. Further, in the sacrificial anode panel 1 according to the third modification of the first embodiment, the outer surface side opening 2FSE does not have to completely coincide with the attachment surface side opening 2BSE in a plan view. As shown in FIG. 10, the moisture introduction hole 2 </ b> C may have a different ratio in which the outer surface side opening 2 </ b> FSE partially overlaps the attachment surface side opening 2 </ b> BSE in a plan view.

(Modification 4 of Embodiment 1)
FIG. 11 is a partially enlarged plan view of the sacrificial anode panel according to the fourth modification of the first embodiment. The same members as those in the first embodiment described above are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 11, when the sacrificial anode panel 1 is attached to the surface of the web 6WS, the moisture introduction hole 2a is a long hole that is longer in the Y direction in the width direction than in the Z direction. The moisture introduction hole 2a has a length 2W in the Y direction that is longer than a length 2R in the Z direction. Thus, although the planar view shape of the outer surface side opening part 2FSE illustrates an oval shape, it can be changed as appropriate. The moisture introduction hole 2a can guide moisture such as rain water flowing down from above in the vertical direction (Z direction) to the moisture introduction hole 2a. The water introduction hole 2a can be applied to the shapes of the water introduction holes 2, 2A, 2B, and 2C described above. For this reason, the sacrificial anode panel 1 according to the fourth modification of the first embodiment has a portion where the outer surface side opening 2FSE does not overlap with the attachment surface side opening 2BSE (not shown) in plan view.

(Modification 5 of Embodiment 1)
FIG. 12 is a partially enlarged plan view of a sacrificial anode panel according to Modification 5 of Embodiment 1. The same members as those in the first embodiment described above are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 12, when the sacrificial anode panel 1 is attached to the surface of the web 6WS, the moisture introduction holes 2b and 2c are long holes that are longer in the Y direction in the width direction than in the Z direction. The moisture introduction hole 2c has a length 2W in the Y direction that is longer than a length 2R in the Z direction. Thus, although the planar view shape of the outer surface side opening part 2FSE illustrates an oval shape, it can be changed as appropriate. The moisture introduction hole 2b according to the fifth modification of the first embodiment has the same shape as the moisture introduction hole 2c, but may have a shape having a different length. In the sacrificial anode panel 1 according to the fifth modification of the first embodiment, the moisture introduction hole 2b and the moisture introduction hole 2c are arranged at positions shifted in the vertical direction (Z direction), and the adjacent moisture introduction holes 2b are arranged. It is a staggered arrangement in which the moisture introduction holes 2c are alternately arranged at half the pitch. Moisture such as rain water flowing down from above in the vertical direction (Z direction) to the middle portion 2t of the adjacent moisture introduction hole 2b can be guided to the moisture introduction hole 2c. The staggered arrangement of the water introduction holes 2b and 2c can be applied to the shapes of the water introduction holes 2, 2A, 2B, and 2C described above. For this reason, the sacrificial anode panel 1 according to the fifth modification of the first embodiment has a portion where the outer surface side opening 2FSE does not overlap with the attachment surface side opening 2BSE (not shown) in plan view. The moisture introduction holes 2b and 2c may be circular, and the shape is not limited.

(Embodiment 2)
FIG. 13 is an explanatory view showing an example in which the sacrificial anode panel according to Embodiment 2 is installed on a steel material. The same members as those in the first embodiment described above are denoted by the same reference numerals, and redundant description is omitted.

  The sacrificial anode panel 1 according to Embodiment 2 is attached to the surface of the lower flange (protruding edge) 6NS, so that the location of the lower flange 6NS that is likely to be corroded (where rust is likely to occur) is locally rust-prevented or corroded. Progression can be delayed.

  FIG. 14 is a plan view of a sacrificial anode panel according to the second embodiment. 15 is a cross-sectional view taken along line D1-D2 of FIG. 14 when the sacrificial anode panel according to Embodiment 2 is attached to a steel material. As shown in FIGS. 14 and 15, the moisture introduction hole 2D has a cross-section (mounting surface 1BS or outer surface orthogonal to the direction from the mounting surface 1BS toward the outer surface 1FS, that is, from the mounting surface 1BS to the outer surface 1FS. The cross-sectional area of the cross section when cut by a plane orthogonal to 1FS is widened. If the moisture introduction hole 2D has, for example, a circular outer shape, the diameter increases from the mounting surface 1BS toward the outer surface 1FS. For this reason, when the outer surface side opening 2FSE of the moisture introduction hole 2D appearing on the outer surface 1FS is viewed in plan view more than the attachment surface side opening 2BSE of the moisture introduction hole 2D appearing on the attachment surface 1BS (sacrificial anode panel) 1), the area is large. And the sacrificial anode panel 1 which concerns on Embodiment 2 has a part which the outer surface side opening part 2FSE does not overlap with the attachment surface side opening part 2BSE seeing by planar view.

  And the sacrificial anode panel 1 which concerns on Embodiment 2 is the thickness direction Fp (virtual line parallel to the normal line of the attachment surface 1BS or the outer surface 1FS) of the sacrificial anode panel 1, and the inner wall 2P of the water introduction hole 2D. An angle β is formed, and a storage space is formed in which moisture W such as rain water is held by the moisturizing material 3 and the inner wall 2P of the moisture introduction hole 2D.

  The above-described moisturizing material 3 can maintain a state in which electricity easily flows from the steel material 6 to the sacrificial anode panel 1 when rainwater or the like is retained and the sacrificial anode panel 1 is wetted. Since the sacrificial anode panel 1 according to Embodiment 2 holds the moisture W supplied through the moisture introduction hole 2D by rainwater or the like, the moisture W can be absorbed by the moisturizing material 3. And since sacrificial anode panel 1 itself turns into an anode with the flow of electricity, steel material 6 itself can be corroded. In particular, if the moisturizing material 3 is a material that easily deforms, the state of electrical continuity with the surface of the lower flange 6NS is improved, and the anticorrosion effect can be improved.

(Modification 1 of Embodiment 2)
FIG. 16 is a partially enlarged plan view of a sacrificial anode panel according to Modification 1 of Embodiment 2. 17 is a cross-sectional view taken along line E1-E2 of FIG. 18 is a cross-sectional view taken along line F1-F2 of FIG. The same reference numerals are given to the same members as those of the first embodiment, the first to fifth modifications of the first embodiment, and the second embodiment, and a duplicate description is omitted.

  As shown in FIG. 15, since the water introduction hole 2D retains the water W, it is preferable to introduce as much water W as rainwater as possible into the water introduction hole 2D. Therefore, the sacrificial anode panel 1 according to the first modification of the second embodiment is provided with the groove 9 connected to the moisture introduction hole 2D on the outer surface 1FS. As shown in FIGS. 15 and 16, the outer surface 1FS has a plurality of grooves 9 around the moisture introduction hole 2D, so that more moisture W can be introduced into the moisture introduction hole 2D. it can. In addition, although the planar view shape of the outer surface side opening part 2FSE illustrates circular, it can be changed suitably. For example, when the plan view shape of the front side opening 2FSE is a polygon such as a triangle or a quadrangle, the groove 9 is connected to the corner of the polygon, so that the moisture W is introduced into the moisture introduction hole 2D. It becomes easy.

  The groove 9 only needs to be connected to the moisture introduction hole 2D. In order to facilitate introduction into the moisture introduction hole 2D, as shown in FIG. 17, the bottom 9B of the groove 9 is inclined toward the moisture introduction hole 2D so as to be deeper than the outer surface 1FS. With this structure, it is possible to increase the possibility that the moisture W entering the groove 9 is introduced into the moisture introduction hole 2D. The bottom 9B of the groove 9 may have the same depth parallel to the outer surface 1FS toward the moisture introduction hole 2D.

  As shown in FIG. 18, the groove part 9 illustrates a triangular cross section. The bottom 9B of the groove 9 may be U-shaped. With this structure, the volume of the groove 9 can be increased. Further, the groove 9 may be a rectangular cross section or a semicircular arc cross section.

  In addition, the groove part 9 is provided in the outer surface 1FS in any one of the first embodiment and the first to fifth modifications of the first embodiment and the moisture introduction holes 2, 2A, 2B, 2C, 2a, 2b, 2c. You may make it connect with at least one of these.

(Modification 2 of Embodiment 2)
FIG. 19 is an explanatory diagram illustrating another example in which the sacrificial anode panel according to the second modification of the second embodiment is installed on a steel material. The same reference numerals are given to the same members as those of the first embodiment, the first to fifth modifications of the first embodiment, and the second embodiment, and a duplicate description is omitted.

  As shown in FIG. 19, the steel material may be a steel material 6A such as a pipe of a chemical plant. Since the surface of the steel material 6A is a curved surface, the sacrificial anode panel 1A according to Modification 2 of Embodiment 2 may also be curved along the surface of the steel material 6A in accordance with the curvature of the surface of the steel material 6A. Similarly, the sacrificial anode panel 1 of any one of the first embodiment, the first modification to the fifth modification, the second modification, and the first modification of the second embodiment is also adapted to the curvature of the surface of the steel 6A. It may be curved.

1, 1A sacrificial anode panel 1FS outer surface 1BS mounting surface 2, 2a, 2b, 2c, 2A, 2B, 2C, 2D moisture introduction hole 2FSE outer surface side opening 2BSE mounting surface side opening 2t intermediate portion 2P, 2Q inner wall 3 Moisturizing material 4A, 4B Fixing hole 5 Stud bolt 5a, 5b Silicone resin 5n Nut 5w Washer 5m Joining material 6, 6A Steel material 6WS Web 6NS Lower flange 7 Marker 8 Mold 8P Protrusion 9 Groove

Claims (17)

A plate material that includes a metal material that has a greater ionization tendency than iron and has a mounting surface that is attached to a steel material via a moisturizing material having moisture retention, and an outer surface opposite to the mounting surface.
Having a plurality of moisture introduction holes penetrating between the mounting surface and the outer surface;
At least one of the outer surface side opening of the moisture introduction hole appearing on the outer surface and the attachment surface side opening of the moisture introduction hole appearing on the attachment surface is a portion that does not overlap the other when viewed in plan view. has,
The sacrificial anode panel, wherein the moisture introduction hole has an inner wall inclined with respect to the thickness direction of the plate material . The sacrificial anode panel according to claim 1 , wherein the mounting surface side opening has a larger area than the outer surface side opening when viewed in a plan view . A plate material that includes a metal material that has a greater ionization tendency than iron and has a mounting surface that is attached to a steel material via a moisturizing material having moisture retention, and an outer surface opposite to the mounting surface.
Having a plurality of moisture introduction holes penetrating between the mounting surface and the outer surface;
The sacrificial anode panel, wherein when attached to the steel material, the moisture introduction hole is inclined upward in the vertical direction from the attachment surface toward the outer surface. The sacrificial anode panel according to any one of claims 1 to 3, wherein the plate member includes a marker indicating a direction in which the plate member is directed upward in a vertical direction when the plate member is attached. The mounting surface side opening portion of the moisture introduction hole that appears on the attachment surface has a larger area than the outer surface side opening portion of the moisture introduction hole that appears on the outer surface in a plan view. Item 4. The sacrificial anode panel according to Item 3 . A plate material that includes a metal material that has a greater ionization tendency than iron and has a mounting surface that is attached to a steel material via a moisturizing material having moisture retention, and an outer surface opposite to the mounting surface.
Having a plurality of moisture introduction holes penetrating between the mounting surface and the outer surface;
The sacrificial anode panel characterized in that the moisture introduction hole has a cross-sectional area that increases from the outer surface toward the mounting surface. A plate material that includes a metal material that has a greater ionization tendency than iron and has a mounting surface that is attached to a steel material via a moisturizing material having moisture retention, and an outer surface opposite to the mounting surface.
Having a plurality of moisture introduction holes penetrating between the mounting surface and the outer surface;
At least one of the outer surface side opening of the moisture introduction hole appearing on the outer surface and the attachment surface side opening of the moisture introduction hole appearing on the attachment surface is a portion that does not overlap the other when viewed in plan view. Have
Viewed in plan view, the outer surface side opening, it characterized by a larger area than the mounting surface side opening portion sacrificial牲陽pole panel. A plate material that includes a metal material that has a greater ionization tendency than iron and has a mounting surface that is attached to a steel material via a moisturizing material having moisture retention, and an outer surface opposite to the mounting surface.
Having a plurality of moisture introduction holes penetrating between the mounting surface and the outer surface;
The sacrificial anode panel, wherein the moisture introduction hole has a cross-sectional area that increases from the mounting surface toward the outer surface.   The sacrificial anode panel according to any one of claims 1 to 8, wherein the plurality of moisture introduction holes are arranged in a staggered manner.   The sacrificial anode panel according to any one of claims 1 to 9, wherein the moisture introduction hole is a long hole in a plan view.   The sacrificial anode panel according to any one of claims 1 to 10, wherein the outer surface has a groove connected to the moisture introduction hole.   The sacrificial anode panel according to any one of claims 1 to 11, wherein the metal material includes at least one of zinc, aluminum, and magnesium.   The sacrificial anode panel according to claim 12, wherein the metal material is an aluminum alloy containing zinc.   The sacrificial anode panel according to any one of claims 1 to 13, wherein the plate material is cast.   The sacrificial anode panel according to any one of claims 1 to 13, wherein the plate material is porous including voids.   The sacrificial anode panel according to any one of claims 1 to 15, wherein the plate material is curved along a surface of the steel material. A procedure for performing a cleaning process for removing rust or corrosion products on the surface of the steel material,
A procedure for determining the mounting direction of the sacrificial anode panel according to any one of claims 1 to 4, with respect to the cleaned surface.
And a procedure for fixing the sacrificial anode panel in the attachment direction determined on the steel material.

Images