• 专利附录
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    • 专利摘要:
    Enamelled steel plate (1) provided with one or more enamel layers (2) on the front, characterized in that the steel plate (4) is provided on the back with a metal layer of a second metal (6) with a more negative electrode potential than the steel plate (4).
    公开号:BE1022830B1
    申请号:E2015/0104
    申请日:2015-03-12
    公开日:2016-09-15
    发明作者:DE BROEK Wout Bert K. VAN
    申请人:Polyvision Naamloze Vennootschap；
    IPC主号:
    专利说明:

    Corrosion protection for enamelled steel.
    The present invention relates to corrosion protection for enamelled steel.
    More specifically, the invention is intended to prevent corrosion in enamelled steel.
    It is known that corrosion is the attack of metal by chemical or electrochemical reactions between metal and elements from the environment. One way to protect steel against corrosion is to enamel the steel plate, whereby the enamel layer protects the underlying steel against attack by environmental factors.
    A problem with an enamelled steel plate is that its edges are not covered by enamel and therefore remain susceptible to corrosion.
    Even when cutting smaller pieces from a larger enamelled steel plate, edges also form around the smaller pieces that are not protected by enamel and become susceptible to corrosion.
    A disadvantage of these enamelled plates or pieces thereof is that they are not resistant to corrosion along the edges, and this where enamelled steel is just used for its corrosion resistance. These applications are found in heat exchangers, tanks for storing corrosive products, panels for wall protection and the like.
    Protection of the edges of enamelled steel is already known by providing it with edge protectors as described in PCT 2014/08574. The edges are hereby encircled by a protection that is inert to corrosion, such as, for example, a protection from polytetrafluoroethylene or another chemically inert material.
    A disadvantage of this protection is that it is not easy to apply and foresee everywhere and generates additional costs for the application to be protected.
    Another disadvantage of this protection is that the seam between protection and enamelled steel can still be broken by corrosive products and over time can lead to corrosion of the edges of the enamelled steel.
    A further disadvantage of this protection is that contemporary aesthetic standards no longer allow the use of such a framework.
    The present invention has for its object to provide a solution to the aforementioned and other disadvantages in that it provides passive protection against corrosion of the enamelled steel.
    To this end the invention relates to an enamelled steel plate provided with one or more enamel layers on the front side, wherein the steel plate is provided on the back side with a backing layer of a second metal with a more negative electrode potential than the steel plate. The backing layer must here be glued with an adhesive containing metal particles, preferably with the same or even more negative electrode potential than the backing layer.
    An advantage of such an enamelled steel plate is that the edges of the steel plate remain free from corrosion because the second metal preferentially undergoes corrosion and sacrifices itself by offering passive cathodic protection to the steel.
    The second metal from the backing layer is preferably zinc.
    An advantage of using zinc is that its potential relative to a Cu: CuSO 4 electrode at neutral pH is - 1.1 V, which is considerably lower than the potential of steel, which is usually between - 0.5 and -0. 8 V. The electrochemically more active zinc acts as a galvanic anode that also makes the potential of the steel surface more negative until the surface has a uniform potential. At that time, the driving force behind the corrosion reaction for the protected steel is removed and corrosion of the steel is prevented. The galvanic anode in zinc continues to corrode and is used up until it may need to be replaced.
    The metal layer of a second metal is preferably adhered to the steel plate by means of an electrically conductive adhesive layer, the electrical conductivity being obtained by adding metal particles with an electronegative potential that is more negative or equal to that of the second metal.
    An advantage of such an electrically conductive adhesive layer is that it ensures good electrical contact between the steel and the second metal, whereby the electric current can flow from the anode to the cathode that is necessary to polarize and protect the steel.
    Preferably, the electrically conductive adhesive layer comprises conductive microparticles of the second metal which are adhered to the steel plate and embedded in an adhesive matrix.
    An advantage of these microparticles is that they ensure good electrical contact between the steel and the second metal in a permanent manner.
    The glue matrix preferably comprises neoprene glue, or another plastic glue, which holds the conductive particles in place, and also ensures good adhesion of the second metal layer on the back of the enamelled steel plate.
    Preferably, the electrode potential of the second metal relative to a Cu: CuSC> 4 electrode in a neutral pH environment is at least 0.3 V more negative than that of steel.
    An advantage of this more negative potential is that this more negative potential allows the second metal to act as a galvanic anode, and causes an electric current from the anode to the cathodic steel plate.
    With the insight to better demonstrate the features of the invention, a preferred embodiment of an enamelled steel plate according to the invention is described below as an example without any limiting character, with reference to the accompanying drawings, in which: figure 1 shows diagrammatically and in perspective view of an enamelled steel plate according to the invention; figure 2 represents a detail indicated by F2 of figure 1 on a larger scale.
    Figure 1 schematically and in perspective shows an enamelled steel plate 1 according to the invention, consisting of an enamel layer 2, a base layer 3, a steel plate 4, an electrically conductive adhesive layer 5, and a backing layer in a second metal 6 that is different made of steel.
    Figure 2 shows the layer structure in the intersection surface of the edge 7 of the enamelled steel plate 1 in more detail, showing that the electrically conductive adhesive layer 5 is made up of electrically conductive microparticles 8 of the second metal 6 which is on the steel plate is glued, embedded in a glue matrix 9.
    The operation of the enamelled steel plate 1 according to the invention is very simple and as follows.
    A simple way to protect a metal against corrosion is to transform the surface of that metal into a cathode of an electrochemical cell by connecting this metal to an easier to corrode second metal that acts as an anode of the electrochemical cell. In this case the steel 4 to be protected is electrically conductively connected to a second metal 6 to be sacrificed, namely zinc, by means of an electrically conductive layer of glue 5 between the steel plate to be protected and the zinc layer 6 to be sacrificed on the back of the steel plate 4.
    The front side of the enamelled steel plate is protected by an enamel layer 2 against corrosion caused by electrolytes that can come into contact with the steel.
    However, the sides or cut surfaces of the enamelled plate are not covered by an enamel layer and are therefore subject to the corrosive action of electrolytes.
    The second metal 6 present on the back, in this case zinc, has a significantly more negative potential, for example at least - 0.3 V lower than the potential of the steel plate 4, measured with respect to a Cu: CuSO 4 reference electrode in a neutral pH environment.
    This second metal 6 pushes the potential of the steel plate to a more negative value until the potential of the side or the cutting surface of the enamelled steel plate 4 is uniform, resulting in a cathodic protection of the steel 4 that no longer corrodes. The galvanic anode, in this case the zinc 6, does corrode and is used up, until it may have to be replaced.
    The driving force behind the cathodic protection current is the difference in electrical potential between anode (the zinc 6) and cathode (the steel 4). It is therefore necessary to maintain an electrically conductive contact between the anode and cathode at all times, and this is achieved by the electrically conductive adhesive layer 5, which is provided with zinc particles 8, which ensure the electrical contact between the steel plate and the zinc plate.
    An advantage associated with this cathodic protection of the enamelled steel is that such enamelled steel can be used as architectural building material, both inside and outside and without the need for edge protection. Also newly cut edges in the enamelled steel or construction panel will not result in corrosion of the steel on the cutting edges. This means that the processability of the panels is not limited by the risk of corrosion, such as when drilling holes for electrical cabling and so on.
    It goes without saying that metals other than zinc can also be used for the cathodic protection of the enamelled steel plates, and for making the conductive adhesive layer 5 conductive between the steel and the second metal, provided that they have a sufficiently negative electrical potential compared to steel.
    It is also self-evident that this cathodic protection can also be applied to enamelled steel that is not flat in shape but has curves to be used in certain places.
    The present invention is by no means limited to the embodiment described by way of example and shown in the figures, but an enamelled steel plate according to the invention can be realized in all shapes and sizes without departing from the scope of the invention as it is claimed described.
    权利要求:
    Claims (8)
    [1]
    Conclusions.
    Enamelled steel plate (1) provided with one or more enamel layers (2) on the front, characterized in that the steel plate (4) is provided on the back with a metal layer of a second metal (6) with a more negative electrode potential than the steel plate (4).
    [2]
    Enamelled steel plate (1) according to claim 1, characterized in that the second metal (6) from the metal layer is zinc.
    [3]
    Enamelled steel plate according to claim 2, characterized in that the metal layer from a second metal (6) is adhered to the steel plate by means of an electrically conductive adhesive layer (5).
    [4]
    Enamelled steel plate according to claim 3, characterized in that the electrically conductive adhesive layer (5) comprises conductive microparticles (8) of the second metal adhered to the steel plate, or of another metal with an electronegative potential that is more negative then those of the second metal, embedded in an adhesive matrix (9).
    [5]
    Enamelled steel plate according to claim 4, characterized in that the glue matrix (9) comprises a plastic glue.
    [6]
    Enamelled steel plate according to claim 5, characterized in that the plastic glue is a neoprene glue.
    [7]
    The enamelled steel plate according to claim 1, characterized in that the electrode potential of the second metal (6) is at least 0.3 V more negative than that of steel relative to a Cu: CuSO 4 electrode in a neutral pH environment ( 4).
    [8]
    The enamelled steel plate according to claim 1, characterized in that the plate (1) is not flat in shape but has curves to be used in certain places.
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