틈 내 전위측정을 통한 Alloy 600 및 Alloy 690의 틈부식 거동과 재부동태 특성

• Published in: Biuletyn Uniejowski Vol. 40; no. 2; pp. 82 - 90
• Main Authors: 오세정(Se-Jung Oh), 이재봉(Jae-Bong Lee)
• Format: Journal Article
• Language: Korean
• Published: 한국표면공학회 2007
• Subjects: 기계공학; Repassivation rate parameter; Crevice corrosion; Passive film; Repassivation kinetics; Abrading electrode
• ISSN: 1225-8024; 2299-8403; 2288-8403

Crevice corrosion is the accelerated attack occurred in the occluded cell under a crevice on the metal surface. Crevice corrosion behaviors of nickel-based alloys such as Alloy 600 and Alloy 690 were investigated in acidic solution with different chloride ion concentrations. Tests were carried out using the specially designed crevice cell with a very narrow Luggin capillary assembly to measure the potential inside the crevice. It is believed that crevice corrosion in active/passive system like nickel-based alloys has much to do with the properties of passive film and its repassivation characteristics, investigated by the capacitance measurement and by the abrading electrode technique, respectively. An attempt was made to elucidate the relationship between crevice corrosion behaviors, properties of passive film and its repassivation kinetics. Results showed that repassivation rate parameter $n1{\leq}0.6$ and/or $n2{\leq}0.5$ indicated the possible occurrence of crevice corrosion.