Effect of The Oil Film Thickness on Corrosion Inhibition of Contact Surface in View of Contact Resistance Characteristics On the Stearic Acid Coating

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概要

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• Reactive gases such air pollution agents as H_2S or SO_2 usually corrode the electrical contact surfaces. Since corrosion products formed on the surface increase contact resistance, they harmfully degrades contact reliability. To prevent the corrosion of the surface, oil coating on it may be effective. The oil film acts basically as a barrier for reaction between the corrosive gas and the surface. For thin film coating, the corrosion inhibition can not be expected. However, effect of film thickness on the corrosion property has not been clarified. In the present study, in order to clarify the corrosion inhibition of the oil coating for the contacts, the stearic acid coating on Ag (silver) contact surface was studied from view-point of the relationship between the thickness of the coating film and the contact resistance. As results, the effect of the stearic acid coating on corrosion inhibition in the atmosphere contained with H_2S 3 ppm was found. However, the corrosion of the surface coated with thin stearic acid film occurred at microscopically scattered thin patiches in the specific pattern of the film. Existing of the optimum thickness of the stearic acid coating which gives both minimum contact resistance and effective corrosion inhibition was found. In the intermediate film thickness, this optimum thickness was induced by the increased contact resistance due to corrosion of the thin film region and insulation property of the stearic acid in the thick film region. Moreover, it was found that this optimum thickness was affected by corrosion time. At the early stage of corrosion, the optimum thickness was about 200 Å. However, the corrosion time becomes longer as 700 min, this optimum thickness changed to thick as 1000Å. With this increase in the thickness, the contact resistance in the optimum thickness rised to high level. Furthermore, the contact resistance in the optimum thickness decreased with increase in the contact load. However, dependence of the contact load on the optimum thickness was not recognized under a certain corrosion time.

• 社団法人電子情報通信学会の論文
• 1993-02-25

著者

• Tamai Terutaka

  Electronics Laboratory Graduate School Hyogo University Of Teacher Education

• Tamai Terutaka

  Electronics Institute Hyogo University Of Teacher Education

関連論文

• Effect of The Oil Film Thickness on Corrosion Inhibition of Contact Surface in View of Contact Resistance Characteristics On the Stearic Acid Coating
• Friction and Contact Resistance through True Contact Interface (国際セッション IS-EMD2005) -- (Contact Phenomena)
• Friction and Contact Resistance through True Contact Interface(Contact Phenomena,Recent Development of Electromechanical Devices (Selected Papers from IS-EMD2005))

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