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Corrosion Inhibitor Coated Refrigeration Insulation To Reduce Metal Corrosion

IP.com Disclosure Number: IPCOM000010987D
Original Publication Date: 2003-Feb-06
Included in the Prior Art Database: 2003-Feb-06
Document File: 1 page(s) / 38K

Publishing Venue

IBM

Abstract

The invention proposes corrosion inhibition of thermally insulated metallic hardware that has moisture condensation on it when its temperature goes below the dew point. Corrosion inhibition is achieved by coating the inner suface of the insulation, that comes in contact with the metallic hardware, with a corrosion inhibitor. The corrosion inhibitor may be simply brushed on the insulation surface and then air dried.

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Corrosion Inhibitor Coated Refrigeration Insulation To Reduce Metal Corrosion

  When refrigeration hardware cools below the dew point, condensation occurs. The moisture condensate corrodes the metallic hardware. Corrosion is more prevalent in hardware that stays below the dew point for long periods of time. One known solution to the corrosion problem is to choose hardware that is corrosion resistant. But corrosion resistant hardware is more costly. Generally, the material of choice from a cost point of view is brass, such as copper alloy C36000. It would be desirable to have a corrosion inhibition scheme built in to the insulation so the corrosion prone copper alloys such as brass are protected from corrosion.

  The invention proposes coating the inside of the insulation surfaces, that come in contact with the cold hardware, with benzotriazole. Benzotriazole is a copper-specific corrosion inhibitor. If the hardware is of metals other than copper, say, steel, then the coating can be of that metal- specific corrosion inhibitor. The advantage of this technique is that low-cost corrosion ihnhibition is obtained that allows the reliabile use of low-cost metal alloys.

  The coating of the inner surface of the insulation may be done by spraying or brushing with water saturated with the metal-specific corrosion inhibitor chemical. Or the aqueous solution can have a variety of corrosion-inhibition chemicals dissoloved in the water to protect a variety of metals and alloys. Afte...