An Experimental Consideration on Electrostatic Discharges from Abnormally Charged Bumpers Having conductive primer layer

DOI Web Site

Bibliographic Information

Other Title
  • <b>導電性プライマー層をもつバンパーの異常帯電時における</b><b>着火性放電の発生条件に関する実験的考察 </b>
  • 導電性プライマー層をもつバンパーの異常帯電時における着火性放電の発生条件に関する実験的考察
  • ドウデンセイ プライマーソウ オ モツ バンパー ノ イジョウ タイデンジ ニ オケル チャッカセイ ホウデン ノ ハッセイ ジョウケン ニ カンスル ジッケンテキ コウサツ

Search this article

Abstract

<p>It is always concerned that if plastic bumpers with conductive primer surface are not properly grounded when they are subjected to electrostatic spray coating, incendiary electrostatic discharges may occur, resulting in explosion and fire. In order to investigate electrostatic phenomena in relation with the electrification of conductive bumpers, we made an experimental set-up consisting of a high-voltage power supply, a digital oscilloscope, a high-sensitive camera, and an ignition probe system. Five bumper samples were subjected to the experiment. It was made clear that the electrostatic potential of an ungrounded bumper will reach a saturation point determined by the onset of corona discharges which occur on edges of the bumper, and there are negative correlation between the surface resistivity of the primer coating and the discharged static charge. As a result of direct ignition test using an explosive mixture of ethylene and air (minimum ignition energy 0.09 mJ), no ignition was observed at the surface voltage less than or equal to 3.0 kV. It is concluded that if it is necessary to give a bumper static charges to check whether the grounding is secured or not, the maximum potential should be 2 kV or smaller, considering a safety margin.</p>

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top