RU172U1 - Device for corrosion protection of metals with dielectric coating in conditions of periodic wetting - Google Patents

Abstract

A device for corrosion protection of metals with a dielectric coating under periodic wetting conditions, comprising a metal protector, characterized in that it is provided with a power source with a voltage determined from the expression: U> = Ep + (Na + Nk + Sum (iR)), where Ep is the decomposition voltage of the tread electrode; Na, Nk - anode and cathodic overvoltage; Sum (iR) - the sum of the voltage drops across the resistances of the contacts, electrodes, electrolyte, and the negative pole connected to the metal to be protected, and positive - to the tread fixed directly to the surface of the dielectric coating.

Description

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- v DEVICE FOR PROTECTION FROM METAL CORROSION. , C. DIELECTRIC HIDDING 1 / UNDER CONDITIONS OF PERIODIC HUMIDIFICATION. -. 23 P 13/00 The utility model relates to the field of the protection of metals from corrosion, and can be used in conditions of periodic deposition. A device for protecting against corrosion of metals immersed in an electrolyte / cm "Corrosion: Reference. Ed. L.L .. Schreyer, M: Metallurgy, 1981 / The device contains a voltage source, the negative pole of which is connected to the metal with a protective pole, and the positive pole is connected to an auxiliary electrode. A disadvantage of the known device is that protection is carried out only in the presence of an electrolyte. A device is also known (see. Corrosion and protection of metals. Rosenfeld IL.chL,: Metallurgy 1969 /, which contains a metal protector located with a protected metal in a metallurgical contact, Cathodic polarization of the protected metal is carried out by dissolving the metal protector in an electrolyte, for example, for a pair of Re-Z / protective potential, 25V. However, the range of the tread contact in the presence of an electrolyte film is very small / units of millimeters /. When the electrolyte film dries and breaks up into individual spots, the electric circuit is discharged altogether, while the corrosion intensifies as well; electrolyte-air is maximum on the meniscus. T.O. such protection under conditions of periodic wetting is ineffective. The aim of the proposed solution is to increase the efficiency of the tread protection of a metal with a dielectric coating against corrosion under conditions of periodic wetting. This goal is achieved by the fact that in the device for corrosion protection of metals with a dielectric coating containing a metal protector, a power source is connected, connected by a positive polkom with a protector, and a negative one with a protected metal. The tread is fixed directly to the surface of the dielectric coating. without metal contact with the protected metal. The voltage of the power source is determined from the conditions of electro-deposition of the metal-tread on the protected metal, i.e., and + .. -. . Ts is the voltage of the power source; EP-voltage decomposition of the tread electrode; "7-anode and cathodic overvoltage

The presence of the electric field of the source of nitride during the existence of a continuous film of electrolyte provides electrodeposition of the metal tread in the areas of damage to the continuity of the dielectric coating. The current distribution during dielectric coating of the metal is favorable for deposition, t, k, the area of continuity defects is hundreds of times fsi5 less than the area of the undamaged coating. During the decomposition of the electrolyte film into individual spots during drying, protection continues until the metal protector deposited earlier until the electrolyte completely dries in the places of defects continuity of the coating, where the electrolyte lasts the longest, creating centers of electrochemical corrosion, and the increased efficiency of tread protection, the device allows to obtain Using relatively low-cost paint corrosion protection, typical of a more expensive pokryt.iya tread. In this case, the continuity defects are healed by the metal-protector as they are. the appearance of that. saves metal protector and electrical energy of the power source.

The device contains a metal protector 1, a voltage source fixed on the surface of the dielectric coating, the positive pole of which is connected to the negative protective electrode with the protected metal,

. Under the action of a voltage source, during continuous humidification / atmospheric phenomena, tides / anodic dissolution of the tread metal occurs and it electro-coagulates onto the protected metal in places of dielectric continuity defects, - During the drying of the electrolyte film, the tread deposited in the continuity defects protects against corrosion.

Author h) .Ponomarenko

POSEP Director General j jA i.M., Eremin

Claims (1)

A device for corrosion protection of metals with a dielectric coating under periodic wetting conditions, comprising a metal protector, characterized in that it is provided with a power source with a voltage determined from the expression: U> = Ep + (Na + Nk + Sum (iR)), where Ep is the decomposition voltage of the tread electrode; Na, Nk - anode and cathodic overvoltage; Sum (iR) - the sum of the voltage drops across the resistances of the contacts, electrodes, electrolyte, and the negative pole connected to the metal to be protected, and positive - to the tread fixed directly to the surface of the dielectric coating.