Process for application of an inorganic coating to an electrical

Details Process for application of an inorganic coating to an electrical Process for application of an inorganic coating to an electrical

1999-05-13

2000-11-28

Pianalto, Bernard

Coating processes

Direct application of electrical, magnetic, wave, or...

Polymerization of coating utilizing direct application of...

427120, 427124, 427309, 427318, 427328, 4273741, 427379, 427380, 427386, 4273881, 4273985, 4273981, 427409, 4274191, 427421, 427427, 427458, 427534, 427541, 427543, 427544, 427591, C08F 246

Patent

active

061532703

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a process of applying an inorganic coating to an electrically conducting body, in particular to a metallic work piece.
From practice, large varieties of processes for applying an inorganic coating to an electrically conducting body are known. In these processes, the buildup of the coating medium occurs under the influence of temperature, which causes a reaction of the coating medium after it is applied to the body or the surface thereof. The reaction leads to the buildup of a substantially inorganic network. Depending on the used coating medium, differently high reaction temperatures are needed. Such reactions differ with respect to thermodynamics and kinetics substantially from reactions with organic coating media. Frequently, the described coating serves to protect the often-metallic body against corrosion. The above-described reaction normally occurs in convection ovens after the coating medium is applied. Depending on the coating medium, the reaction temperature is between 180.degree. C. and 300.degree. C. At these temperatures, the coating medium fully reacts to form the coating.
The use of such convection ovens is problematic in that the heating process of the body being coated proceeds very sluggishly. In this process, a change of the temperature requires a great deal of time. Based on the sluggish temperature variation, thermal conduction causes in most cases that the entire body is unnecessarily heated at the same time when the coating medium fully reacts in the surface region of the body. This simultaneous heating of the entire body requires a large amount of energy without contributing to the reaction process.
Furthermore, the use of the known convection ovens is disadvantageous, inasmuch as it is necessary to make the convection ovens so voluminous that the furnace fully accommodates the body being coated. Consequently, the realization of the known coating process requires a large amount of space in an uneconomical manner.
It is therefore the object of the present invention to describe a process of applying an inorganic coating to an electrically conducting body, which facilitates a precisely controllable temperature variation with short temperature changes in an economic and energy-saving operation.
The foregoing object is accomplished by a method comprising the steps of claim 1. Accordingly, a process of applying an inorganic coating to an electrically conducting body is characterized by the following steps:
First, the body is prepared. Subsequently, if need be, the body is degreased, and/or chemically pretreated, and/or blasted or sandblasted. This allows preparing the surface of the body for the coating, if required. Thereafter, a coating medium is applied to at least the surface region of the body, which is to be coated.
Therefore, in accordance with the invention, at least the surface region of the body, which is to be coated, is heated by induction to a reaction temperature before and/or while and/or after applying the coating medium. This inductive heating of the present invention permits realizing a heating of the body that is energetically quite especially advantageous, since only the surface region to be coated is heated and not necessarily the entire body. In this connection, a direct coupling to the electrically conducting body causes in the body the generation of eddy currents that lead based on the electric resistance of the body material to a heating of the body. Energy losses resulting from the heating of a heating medium in the form of, for example, recirculated air and its unavoidable radiation of heat are here prevented. Consequently, the heating is purposefully caused in the body or in its surface region. With that, a suitable controlling of the induction device facilitates a precisely controllable temperature variation with therefrom-resultant short temperature changes. Because of the inductive heating, the body is heated quasi from the inside out. In this connection, a highly efficient heating of the coating medium is likewise effected.
In summary

REFERENCES:
patent: 3619231 (1971-11-01), Johnson
patent: 5325601 (1994-07-01), Brownewell et al.

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