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Research and monitoring of corrosion in industrial chemical production has important consequences with regard to the safe and economic operation of the plant with accurate knowledge of global and local corrosion rates being critical to lifetime assessment. One of the most common methods of obtaining data about corrosion rates in aggressive media is to monitor weight loss from bulk samples during prolonged immersion testing. This method, although effective for determining the average rate of corrosion, is not appropriate where the corrosion rate is very low or where behaviour can vary locally such as may happen in compositionally or structurally modified regions such as welds and the surrounding heat affected zones. In order to allow an evaluation of the corrosion in such small, specific areas, a radiotracer-based method, thin layer activation, has been examined which permits high sensitivity, on-line, corrosion monitoring of precisely defined areas (smaller than 0.15cm{2}) of samples. In this work the method will be described in detail and results presented relating to its application to the measurement of corrosion rates in the bulk, the heat affected and in the fused zones of welded SAF 2507 and Sanicro 28 stainless steels. The results obtained by TLA will be compared with data obtained in complimentary studies conducted using conventional weight loss and electrochemical impedance and microscopy methods.

Additional information

Authors: GILLILAND D, JRC, IHCP, Ispra (IT);STROOSNIJDER M F, JRC, IHCP, Ispra (IT);SYMNIOTIS E, Swedish Institute for Metals Research (SE);FLYG J, Swedish Institute for Metals Research (SE)
Bibliographic Reference: An oral report given at: EUROCORR. Held in: Riva del Garda (IT), 30 September-4 October 2001
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