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99465 GALVANIC CORROSION - EFFECT OF ENVIRONMENTAL AND EXPERIMENTAL VARIABLES

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Product Number: 51300-99465-SG
ISBN: 99465 1999 CP
Author: Ajit K. Roy, Dennis L. Fleming, Beverly Y. Lum
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Galvanic corrosion behavior of A 516 steel (UNS K01800) coupled to UNS N06022 and UNS R53400, respectively was evaluated in an acidic brine (pH = 2.75) at 30°C, 60°C and 80°C using zero resistance ammeter method. A limited number of experiments were also petiormed in a neutral brine involving A 516 steel/UNS N06022 couple. The steady-state galvanic current and galvanic potential were meaaured as fimctions of anode-to-cathode (A/C) area mtio and electrode distance. Results indicate that the galvanic current was gradually reduced as the A/C area ratio was increased. No systematic trend on the effect of A/C area ratio on the galvanic potential was observed. Also, no significant effect of electrode distance on the galvanic current and galvanic potential was evident. In generalj increased galvanic current was noticed with increasing temperature. The limited data obtained in the neutral brine indicate that the galvanic current was reduced in this environment compared to that in the acidic brine. Optical microscopic examination was performed on all tested specimens to evaluate the extent of surface damage resulting ffom galvanic interaction. A 516 steel suffered from general corrosion and crevice corrosion in all environments tested. Very light crevice corrosion mark was observed with UNS N06022 and R53400 in the acidic brine at 60°C and 80°C. However, this mark appears to be a surface discoloration and no actual crevice was detected. Keywords: Galvanic corrosion, carbon steel, nickel-base alloy, titanium alloy, galvanic current galvanic potential, area ratio, electrode distance, pH, and temperature effect.
Galvanic corrosion behavior of A 516 steel (UNS K01800) coupled to UNS N06022 and UNS R53400, respectively was evaluated in an acidic brine (pH = 2.75) at 30°C, 60°C and 80°C using zero resistance ammeter method. A limited number of experiments were also petiormed in a neutral brine involving A 516 steel/UNS N06022 couple. The steady-state galvanic current and galvanic potential were meaaured as fimctions of anode-to-cathode (A/C) area mtio and electrode distance. Results indicate that the galvanic current was gradually reduced as the A/C area ratio was increased. No systematic trend on the effect of A/C area ratio on the galvanic potential was observed. Also, no significant effect of electrode distance on the galvanic current and galvanic potential was evident. In generalj increased galvanic current was noticed with increasing temperature. The limited data obtained in the neutral brine indicate that the galvanic current was reduced in this environment compared to that in the acidic brine. Optical microscopic examination was performed on all tested specimens to evaluate the extent of surface damage resulting ffom galvanic interaction. A 516 steel suffered from general corrosion and crevice corrosion in all environments tested. Very light crevice corrosion mark was observed with UNS N06022 and R53400 in the acidic brine at 60°C and 80°C. However, this mark appears to be a surface discoloration and no actual crevice was detected. Keywords: Galvanic corrosion, carbon steel, nickel-base alloy, titanium alloy, galvanic current galvanic potential, area ratio, electrode distance, pH, and temperature effect.
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