On the substitution of conventional corrosion tests by an electrochemical potentiokinetic reactivation test

• Published in: Corrosion science Vol. 52; no. 5; pp. 1582 - 1592
• Main Authors: Prohaska, M., Kanduth, H., Mori, G., Grill, R., Tischler, G.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-05-2010; Elsevier
• Subjects: A. Alloy 625; Applied sciences; B. Polarization; C. Intergranular corrosion; Corrosion; Corrosion environments; Exact sciences and technology; Metals. Metallurgy; C. Intergranular corrosion; A. Alloy 625; B. Polarization; Corrosion test; Nickel base alloys; Intergranular corrosion
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2010.01.017

Nickel-based alloy 625 was investigated by means of a conventional corrosion test (Streicher-test according to ASTM G28A
[1]) and an electrochemical potentiokinetic reactivation test (according to ASTM G108
[1], with some modifications). Susceptibility to intergranular corrosion after various heat treatments was examined by using both test methods and the results were compared. Dependent on the type of heat treatment applied, both methods showed partially different results. Possibilities and limitations of replacing Streicher-test with EPR-test are pointed out and commentated. In conclusion, the EPR-test presents itself as a promising and quick investigation technique for detecting susceptibility to intergranular corrosion in nickel-based alloys.