JPH0243876Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of the invention] The invention relates to a zinc foil anticorrosive tape that prevents corrosion of objects to be protected by utilizing cathodic protection and coating anticorrosion. By using zinc foil and providing a non-conductive adhesive layer so that some of the protrusions protrude, the zinc protrusions are brought into electrical contact with the object to be protected, ensuring cathodic protection. This invention relates to a zinc foil anticorrosion tape that can be used as a zinc foil anticorrosive tape.

[Prior Art] Generally, as a method for preventing corrosion of metal members, there is a cathodic protection method in which a metal that is electrochemically more base than the object to be protected, which is the metal member, is brought into electrical contact with the object to be protected and used as a sacrificial anode. It has been known. These cathodic protection methods, particularly the method using a tape-shaped sacrificial anode, are relatively simple to implement and have excellent corrosion protection effects, so they are widely practiced as a means of corrosion protection.

A sacrificial anode using this cathodic protection method was published in 1973.
-Disclosed in Publication No. 16854. This sacrificial anode has a conductive adhesive layer between it and the metal to be cathodically protected, bringing the sacrificial anode into electrical contact with the metal to be cathodically protected. As a result, there is little room for selecting non-conductive adhesives in terms of adhesive strength or price, and it is difficult to meet various demands such as high adhesive strength or adhesion to oil surfaces. Furthermore, the problem arises that metal particles that are usually mixed in to provide conductivity oxidize over time, resulting in deterioration of conductivity.

The inventors of the present invention have invented an anticorrosion tape that overcomes the drawbacks of using such a conductive adhesive or pressure-sensitive adhesive (Japanese Patent Application No. 52,777/1983). This anti-corrosion tape has a non-conductive adhesive layer applied on one side of a tape or strip made of a metal that is electrochemically more base than the object to be protected, such as iron, so as to leave an uncoated area.
Further, on the side to be applied to the object to be protected from corrosion, the non-conductive adhesive layer is protected by a release paper that is peeled off during use. When this anti-corrosion tape is applied to an object to be protected from corrosion, the portion to which the anti-corrosion tape is applied is first protected against corrosion by coating. Furthermore, in the unpainted area, the metal tape or strip is attached so that it is in contact with the object to be protected, so the electrochemically base metal acts as a sacrificial anode for the object to be protected, and is a cathode that preferentially corrodes. Anticorrosion effect can be expected.

[Problems with the prior art] However, in the anticorrosion tape disclosed in Japanese Patent Application No. 59-52777, after being applied to the object to be corroded, light pressure is applied to prevent uncoated areas from being exposed to the metal tape or strips. An electrical connection is made between the corrosion protectors, but the disadvantage is that the non-conductive adhesive flows in a direction that pulls the electrical contact points apart, making the contact at the electrical contact points unstable. In order to overcome this problem, a pressing method using a jig such as a rubber roll may be used, but this method has the disadvantage of lacking in simplicity.

[Purpose of the invention] The present invention has been made in order to eliminate the drawbacks of the above-mentioned conventional technology.It is easy to handle, and even when a non-conductive adhesive is used, it can be used with electrochemically base metals and objects to be protected. An object of the present invention is to provide a metal foil anticorrosion tape that provides reliable electrical contact between the metal foil and the metal foil.

As a result of various studies in line with the above objectives, the inventors of the present invention used electrolytic zinc foil with an uneven surface on one side, that is, the electrodeposited surface, as a sacrificial anode to ensure that the convex portions of the uneven surface were connected to the object to be protected. By applying a non-conductive adhesive or adhesive layer in contact,
We have discovered that it is possible to ensure a reliable electrical connection between zinc foil and the object to be protected, and have arrived at the present invention.

[Structure of the invention] That is, the invention provides a zinc foil anticorrosion tape characterized in that a non-conductive adhesive layer is provided on the electroplated side of the electrolytic zinc foil having an uneven surface so that the convex portions partially protrude. It is in.

Hereinafter, the present invention will be specifically explained based on the drawings.

FIG. 1 is a schematic diagram of a zinc foil anticorrosive tape according to the present invention, which is in the form of a roll. Also, the second
The figure is a plan view illustrating a state in which the zinc anticorrosion tape of the present invention is applied to an object to be protected from corrosion. In Figures 1 and 2, 1 is an electrolytic zinc foil, 2 is a convex portion of the uneven surface formed on the electrodeposition side of the electrolytic zinc foil 1, 3 is a non-conductive adhesive layer, and 4 is a non-conductive layer. Release paper protects the adhesive layer 3, and 5 indicates an object to be protected from corrosion.

The electrolytic zinc foil 1 used in the present invention shown in FIG. 1 is a zinc foil manufactured by an electrolytic method,
The electrodeposited surface side has an uneven surface formed during manufacturing. In other words, in the electrolytic zinc foil 1 manufactured by depositing from a zinc sulfate bath using a titanium drum or the like, the surface on the drum side is flat, but the surface on the electrodeposited side is due to the electrodeposited material deposited in the form of dendrites. , a bump-shaped protrusion 2 is formed. The electrolytic zinc foil 1 is used after being processed into a tape or strip-like shape, and its thickness is not particularly limited, but considering the lifespan as a metal foil tape, it is 0.01
The thickness is preferably 0.02 to 0.3 mm, which is preferably about 0.02 to 0.3 mm, which is highly flexible, and considering workability and the like.

In the present invention, a non-conductive adhesive layer 3 is provided on the electrodeposited surface side of the electrolytic zinc foil 1 obtained in this way.
is provided so that a part of the convex portion 2 of the uneven surface protrudes as shown in FIG. The non-conductive adhesive used in the present invention is appropriately selected from common inexpensive non-conductive adhesives such as acrylic adhesives, and a mixture of these and chlorinated rubber may be used. Also,
The thickness of the applied non-conductive adhesive layer is 0.01~0.1
mm is preferred.

Furthermore, in the present invention, depending on handling needs such as storage and transportation, a release paper 4 is attached to the side of the non-conductive adhesive layer 3 to be attached to the object 5 to be protected from corrosion, and the non-conductive adhesive is applied until just before use. It is desirable to protect the agent layer 3. As such a release paper 4, a paper tape made of paper laminated with polyethylene or the like and further subjected to silicon processing or the like or a tape made of polypropylene or the like is used.

The zinc foil anticorrosive tape obtained as described above is pasted on an object 5 to be protected from corrosion, such as iron, after peeling off the release paper 4, as shown in FIG. At the time of pasting, the protrusions 2 on the electrodeposition side, which protrude from the non-conductive adhesive layer 3, reliably contact the object to be protected 5, so that the electrolytic zinc foil 1 and the object to be Electrical contact with the body 5 will be reliably maintained.

In such a state, the electrolytic zinc foil 1 functions sufficiently as a sacrificial anode because it is electrochemically base to the object to be protected 5 such as iron, so it has a cathodic protection effect and is covered with a zinc foil anticorrosion tape. Because it does this, it also has an anti-corrosion coating effect, and also prevents corrosion of the object to be protected.

[Effects of the invention] As explained above, according to the zinc foil tape of the invention, the electrical contact point between the zinc foil and the object to be corroded can be reliably maintained without using a conductive adhesive. Therefore, various non-conductive adhesives can be used, and it is possible to provide zinc foil anticorrosive tapes that can meet various usage conditions, such as anticorrosive tapes with high adhesive strength and anticorrosive tapes with excellent oil resistance.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of the zinc foil anticorrosion tape according to the present invention, and FIG. 2 is a plan view showing the zinc foil anticorrosion tape of FIG. 1 applied to an object to be protected from corrosion. DESCRIPTION OF SYMBOLS 1... Electrolytic zinc foil, 2... Convex part, 3... Non-conductive adhesive layer, 4... Release paper, 5... Corrosion-protected object.

Claims (1)

[Scope of utility model registration request] A zinc foil anti-corrosion tape characterized in that a non-conductive adhesive layer is provided on the electrodeposited side of the electrolytic zinc foil having an uneven surface so that some of the convex portions protrude.