JPS61113676A - Corrosionproof tape made of metal plate - Google Patents

Abstract

PURPOSE:To obtain a tape of good electrical conductivity and adhesivity useful for corrosionproof application to iron/steel products, by providing protrusions on the single side of corrosionproof metal plate with pressure-sensitive adhesive coated on said side. CONSTITUTION:The surface of a metal plate (e.g. made of zinc) 1 of pref. 50-200mu thick is provided with protrusions 2 when subjected, for example, to rolling, followed by coating or the surface pressure-sensitive adhesive 3 (e.g., of rubber-base) with a thickness, pref. 10-50mu, thus obtaining the objective tape. Said protrusions 2 are pref. of 30-70mu high, being provided at intervals of 20-50mm so as to come into contact with body 4 to be protected by penetrating through the adhesive layer to effect sticking.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an anti-corrosion tape that is used to prevent corrosion of steel products and has excellent anti-corrosion properties and workability.

BACKGROUND OF THE INVENTION Conventionally, metal plate anticorrosion tape (sometimes simply abbreviated as "anticorrosion tape") has been described in an article on page 7 of the Nikkan Kogyo Shimbun dated August 31, 1981.

For example, in the case of zinc foil anticorrosion tape, ensuring electrical conductivity was an important point in order to enhance the anticorrosion effect due to sacrificial anode action.

Two methods are known as countermeasures against this problem. One type is one in which metal particles such as zinc particles are mixed into the adhesive to make it conductive.

The other type is one in which metal contact is made electrically conductive through a special coating process, such as by leaving an uncoated area with adhesive, as shown in Figures 5 and 6. It is.

Of these, the ones in FIGS. 5 and 6 show aspects of the above-mentioned known zinc foil anticorrosive tape, in which adhesive 3 is placed at intervals on a metal plate 1 such as a zinc foil, It is applied in such a way that the space between them is left unpainted, and when it is applied to the object 4 to be protected from corrosion, the unpainted part of the metal plate 1 comes into direct contact with the object 4 to be protected, and continuity is maintained at the contact area 6. It turns out.
゛Problems to be Solved by the Invention However, although these conventional anti-corrosion methods can provide an anti-corrosion function, they still have the following problems.

In the former case, there is the problem of deterioration of conductivity over time due to oxidation of metal particles in the adhesive, and the problem of high cost of the adhesive itself.

In the latter case, there is a problem of a decrease in conductivity due to insufficient contact and a problem of a decrease in adhesive strength.

An object of the present invention is to provide a new anticorrosion tape that solves the problems of these conventional methods.

Means for Solving the Problems As a result of examining various means for solving the above-mentioned problems, the inventors of the present invention have found that corrosion protection can be achieved by providing protrusions on at least one side of the metal plate on the side to which the adhesive is applied. The present invention was made based on the discovery that the conductivity and adhesive properties of the tape can be significantly improved.

That is, the gist of the present invention is to provide a metal plate anti-corrosion tape, which is characterized in that a metal plate is coated with an adhesive on one side, and a protrusion is provided on at least one side of the metal plate on the side where the adhesive is applied. It is in.

The present invention will be explained in detail below.

1 and 2 show an example of the structure of the anticorrosion tape of the present invention. In FIG. 0, l is a metal plate, 3 is an adhesive, and the metal plate 1 is made of aluminum. Metals or alloys that are electrochemically active with respect to iron can be used, such as zinc, magnesium, manganese, chromium, titanium, or alloys thereof.

Moreover, as the type of adhesive 3, those having excellent water resistance and electrolytic corrosion resistance such as rubber-based, vinyl-based, epoxy-based, and bituminous-based adhesives are suitable.

Furthermore, in these figures, protrusions 2 are provided on the adhesive 3 coated surface of the metal plate 1. These protrusions 2 can be provided when processing the metal plate 1 such as rolling, and the protrusions 2 cover the layer of adhesive 3 when adhering to the object 4 to be protected from corrosion as shown in FIG. The metal plate 1 penetrates and comes into contact with the object 4 to be protected from corrosion at the contact portion 6, so that the metal plate 1 can maintain conduction with the object 4 to be protected.

In addition, since the metal plate 1 provided with such protrusions 2 can be coated with the adhesive 3 in a normal adhesive coating process, there is no need for complicated processes such as forming uncoated areas as in the prior art. . Moreover, since the protrusion 2 can maintain sufficient contact with the object 4 to be protected from corrosion, conductivity can be ensured without any problem.

Although not shown, it is of course possible that the protrusions 2 are on both sides of the metal plate l. However, in any case, the point is that if the protrusion 2 is provided at least on the side where the adhesive 3 is applied,
Sufficient electrical conductivity can be obtained even when anti-corrosion tape is layered.

Here, the thickness of the metal plate 1 must be such that the protrusions 2 do not disappear due to the tension during attachment, and from the viewpoint of anticorrosive effect, it is preferably about 50 to 200 g.

The protrusion 2 preferably has a conical tip with a sharp tip so as to penetrate through the adhesive layer and contact the object to be protected during adhesion, or a knife with a sharp tip.

Also, the height of protrusion 2 is 30w, which is slightly larger than the thickness of the adhesive layer.
~70 tiles is desirable.

In addition, the distribution of protrusions 2 should be at one or more locations on the surface of the anticorrosive tape, and since it is rolled,
Approximately one location per 01111 pitch is desirable.

The coating thickness of the adhesive 3 is suitably between lop and 50 l because it is necessary to ensure conductivity and adhesive strength.

Furthermore, FIGS. 3 and 4 show typical embodiments of the application of the anticorrosion tape of the present invention to actual steel structures. That is, FIG. 3 shows steel pipes covered with anti-corrosion tape, and FIG. 4 shows steel sheet piles covered with anti-corrosion tape.

The anticorrosion tape has a predetermined size determined by workability (for example, radius 2
0Gm x 0.1 mm thick), with knife-edge or cone-shaped protrusions formed by rolling at appropriate intervals (for example, 50 mm) in the width direction of the tape, with weather resistance, It is obtained by applying an adhesive with excellent water resistance and electrical corrosion resistance.

The effects of the present invention will be illustrated in more detail by way of examples below.

Example: During the rolling process of a metal plate made of zinc with a thickness of 0.11 mm, knife-edge protrusions with a height of 50 mm were provided at intervals of 50 mm, and then a rubber adhesive was applied to a metal plate with a thickness of 30 mm with protrusions. It was applied over the entire surface of one side. Length 100III11
, anti-corrosion tape of 50mm width, 200 layers long, 1 width 70m
After pasting the three layers in the center of a 3,111 m thick steel plate, the conductivity was investigated by spot welding.

As a result, the conductivity was maintained regardless of the roughness of the surface to which the anticorrosion tape was applied and the local dirt, and even when the steel plate was bent at an angle of 80° after the anticorrosion tape was applied.

On the other hand, as a comparative example, a similar experiment was conducted using a zinc plate anti-corrosion tape with a thickness of 0.1 m +++ coated with a rubber adhesive to a thickness of 30 tiles and a width of 50 mm, with a shape corresponding to the conventional one shown in Fig. 5. However, if local dirt or a bent part comes into contact with an uncoated area of the adhesive, conductivity may be lost.

Effects of the Invention According to the present invention, conductivity can be easily and reliably obtained in the anticorrosion tape, and adhesion can be obtained over the entire surface of the tape, significantly increasing the anticorrosion effect, and the industrial effect is extremely significant. There is something.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the structure of the anti-corrosion tape of the present invention, Fig. 2 is a sectional view showing the anti-corrosion tape of the invention applied to an object to be protected, and Fig. 3 shows the anti-corrosion tape of the invention applied to a steel pipe. 4 is a perspective view showing the state in which the anti-corrosion tape of the present invention is attached to a steel sheet pile, and FIGS. 5 and 6 respectively show the conventional anti-corrosion tape and the state in which it is attached to the object to be protected from corrosion. FIG. 1...Metal plate, 2. Fist meeting/protrusion, 3... Adhesive, 4.
... Corrosion protected object, 5... Corrosion protection tape, 6... Contact portion between the metal plate and the corrosion protected object.

Claims (1)

[Claims] 1. A metal plate anticorrosion tape, characterized in that a metal plate is coated with an adhesive on one side of the metal plate, and has protrusions on at least one side of the metal plate on the side where the adhesive is applied.