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Corrosimeter

IP.com Disclosure Number: IPCOM000076335D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

James, PM: AUTHOR

Abstract

The placing of computer hardware systems into corrosive environments presents corrosion problems. The corrosimeter is an instrument used to determine the relative corrosiveness of these environments. The atmosphere is drawn over a test card by an internal fan at a flow rate approximating representative gate velocities.

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Corrosimeter

The placing of computer hardware systems into corrosive environments presents corrosion problems. The corrosimeter is an instrument used to determine the relative corrosiveness of these environments. The atmosphere is drawn over a test card by an internal fan at a flow rate approximating representative gate velocities.

The test card has pairs of copper lines of various spacings to give the device a wide range of sensitivities. The instrument's principle of operation utilizes the change in insulation resistance, as a function of the formation of bridging corrosion between the pairs of copper lines. The copper is quite sensitive to the formation of bridging corrosion caused by the synergistic action of hydrogen sulfide and chlorine. This corrosion "grows" between the lines, causing the insulation resistance to drop precipitously when the gap is bridged.

The readout devices are elapsed time meters connected to the pairs of copper lines. These meters measure the time for the insulation resistance to drop to 10,000 ohms. Magnetic triggering switches are used in the electronic circuitry and designed such that no amount of self-cleaning or scrapping will allow the clocks to be turned back on, until the entire system is reset. Temporary power shutdown does not affect the function of the operation. The time-to- bridging is correlated with the relative "hostility" of the environment and predictions made concerning the types of systems that should be used, the ...