A novel electrical resistance (ER) probe is designed. It includes 4 coupons, 2 of them exposed in a corrosion environment and 2 sealed in epoxy for monitoring the environmental corrosion rates and deviations. A corrosion index P is introduced to eliminate the temperature influence. The mean corrosion rates within individual periods of time are calculated based on the P-t curves. The probe’s sensitivity in thickness is determined based on the P-Rx (corroded coupon’s resistance) curves. In addition, the influences of output line resistance and the pitting factors on the measure errors are investigated. Ratios of two contrast resistances are analyzed with a statistical method to determine the unusual fluctuation, and used as an index for sealing damage alarm. Comparison with weightlessness experiments shows that this kind of ER probes can offer approximately consistent results for quick estimation of the degree of environmental corrosion.
FENG Bei1,2, WENG Yong-ji1,3, LI Xiang-yi1,3, LI Jun-hao1, JIAO Zheng2
. A novel coupon-type electrical resistance probe for environmental corrosion monitoring[J]. Journal of Shanghai University, 2015
, 21(1)
: 88
-96
.
DOI: 10.3969/j.issn.1007-2861.2104.01.030
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