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Comprehensive Laboratory Analysis Of AC Coupon Test Stations

Comprehensive Laboratory Analysis of AC Coupon Test Stations
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Several alternating current (AC) coupon test stations (CTS) located near AC power lines were investigated to assess the AC interference corrosion risk of the test coupons. Asstation consisted of two ½ inch (1.27 cm) diameter and 1received each AC test inch (2.54 cm) long carbon steel (CS ) coupons. Coupons are much larger than 1 cm 2 and current density measurements are not 100% relatable to the SP21424 or ISO 18086 criteria, since these refer to measurements on (typically) 1 cm2 . The current densities measured on the coupons in this study will underestimate the AC corrosion threat. 

Product Number: 51322-18151-SG
Author: Mehrooz Zamanzadeh, Martin Latona, George Bayer, Anil Kumar Chikkam
Publication Date: 2022
Industries: Science of Corrosion , Corrosion Monitoring and Control
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$20.00
$20.00

In this paper, a test protocol for the laboratory analysis of the coupon test stations (CTSs) exposed to alternating current (AC) interference from the adjacent power lines was discussed in detail. Corrosion of coupons from the CTSs are mainly du e to AC interference, corrosive soil, or microbiological induced corrosion (MIC). This paper provides an overview of corrosion issues commonly experienced by coupons and presents specific case histories involving AC interference, corrosive soil, and MIC. D uring the laboratory analysis, coupons were examined visually and photographed, studied under stereo microscope, and the coupons were also examined in detail using scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) in the as receiv ed condition and correspondingly after ultrasonic cleaning. The findings of the laboratory analysis are correlated with CTS historical data and relevant field inspection data to identify the actual cause of the corrosion of the CTSs.

In this paper, a test protocol for the laboratory analysis of the coupon test stations (CTSs) exposed to alternating current (AC) interference from the adjacent power lines was discussed in detail. Corrosion of coupons from the CTSs are mainly du e to AC interference, corrosive soil, or microbiological induced corrosion (MIC). This paper provides an overview of corrosion issues commonly experienced by coupons and presents specific case histories involving AC interference, corrosive soil, and MIC. D uring the laboratory analysis, coupons were examined visually and photographed, studied under stereo microscope, and the coupons were also examined in detail using scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) in the as receiv ed condition and correspondingly after ultrasonic cleaning. The findings of the laboratory analysis are correlated with CTS historical data and relevant field inspection data to identify the actual cause of the corrosion of the CTSs.

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