Open AccessEvaluation of coupons from Tank 50
Author(s) -
J.I. Mickalonis
Publication year - 1995
Language(s) - English
Resource type - Reports
DOI - 10.2172/162495
Subject(s) - corrosion , environmental science , waste management , coupon , degradation (telecommunications) , municipal solid waste , metallurgy , materials science , engineering , telecommunications , finance , economics
The coupons from the corrosion coupon rig (CCR) were removed from tank 50 after a ten-month exposure. The evaluation consisted of microscopic examination, weight losses, and pit depth measurements. The coupons were exposed in both the liquid waste and the air space above the waste. The corrosion in the air space was characterized by variable-depth degradation under adherent corrosion products. Corrosion degradation was not significant for coupons in the waste. The coupon areas exposed at the air-waste interface had pits; the deepest measuring 6 mils. These results provide cur-rent information on actual corrosion in the waste tank. Continued use of the CCR on tank 50 is recommended (i) to monitor pitting rates, (ii) to verify the low corrosion degradation of the tanks, and (iii) to complete the CCR development for future implementation in tanks 43 and 48