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00709 MIL-L-87177 AND A COMMERCIAL LUBRICANT IMPROVE ELECTRICAL CONNECTOR FRETTING CORROSION BEHAVIOR

Picture for 00709 MIL-L-87177 AND A COMMERCIAL LUBRICANT
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Product Number: 51300-00709-SG
ISBN: 00709 2000 CP
Author: Dr. James T. Hanlon, Dr. Neff R. Aukland
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We have conducted a fretting research project using MIL-L-87177 and a Commercial Lubricant on Nano-miniature Connectors. Fretted without lubricant, individual connectors first exceeded our 0.5 ohm failure criteria from 2,341 to 45,238 fretting cycles. With additional fretting, their contact resistance increased to more than 100,000 ohms. Unmodified MIL-L-87177 lubricant delayed the onset of first failure to between 430,000 and over 20 million fretting cycles. MIL-L-87177 modified by addition of 1 micron Teflon powder 2 delayed first failure to beyond 5 million fretting cycles. Best results were obtained when the modified lubricant was used and also when both straight and modified lubricants were poured into and then out of the connector. The Commercial Lubricant delayed onset of first failure to beyond 55 million cycles in one test where a failure was actually observed and to beyond 20 million cycles in another test terminated without failure. The Commercial Lubricant recovered an unlubricated connector driven deeply into failure, with six failed pins recovering immediately and four more recovering during an additional 420 thousand fretting cycles. MIL-L-87177 was not able to recover a connector under similar conditions.
We have conducted a fretting research project using MIL-L-87177 and a Commercial Lubricant on Nano-miniature Connectors. Fretted without lubricant, individual connectors first exceeded our 0.5 ohm failure criteria from 2,341 to 45,238 fretting cycles. With additional fretting, their contact resistance increased to more than 100,000 ohms. Unmodified MIL-L-87177 lubricant delayed the onset of first failure to between 430,000 and over 20 million fretting cycles. MIL-L-87177 modified by addition of 1 micron Teflon powder 2 delayed first failure to beyond 5 million fretting cycles. Best results were obtained when the modified lubricant was used and also when both straight and modified lubricants were poured into and then out of the connector. The Commercial Lubricant delayed onset of first failure to beyond 55 million cycles in one test where a failure was actually observed and to beyond 20 million cycles in another test terminated without failure. The Commercial Lubricant recovered an unlubricated connector driven deeply into failure, with six failed pins recovering immediately and four more recovering during an additional 420 thousand fretting cycles. MIL-L-87177 was not able to recover a connector under similar conditions.
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