|
Vol.47, No.10, 635 ~ 644, 2009
|
| Title |
| Evaluation on Resistance to Pitting Corrosion of Fe-Cr Alloys via Measurement of the Critical Pitting Temperature (CPT) and Potentiodynamic Polarization According to KS D 0238 (wet, dry), ASTM G 61 and ISO 17475 Standards |
| 강수연 Su Yeon Kang , 이재봉 Jae Bong Lee , 김영호 Yeong Ho Kim |
|
|
|
| Abstract |
| The resistance to pitting corrosion of Fe-Cr alloys was evaluated by performing potentiodynamic polarization and critical pitting temperature (CPT) tests. For the potentiodynamic polarization tests, various standards were applied, i.e., KS D 0238 (wet, dry), ASTM G 61, and ISO 17475, showing different potentiodynamic polarization results including pitting potentials. ASTM G 61 and ISO 17475 standards presented relatively higher pitting potential while KS D 0238 (dry) indicated lower values than the others. Effects of surface roughness, scan rates, and exposure time to air before tests were also investigated. CPT tests were performed under two different applied potentials, 300 mV(SCE) and 200 mV(SCE) in deaerated 1 M NaCl aqueous solution. CPT values and the polarization test results showed a linear relationship. |
|
|
| Key Words |
| Fe-Cr alloys, potentiodynamic polarization, pitting potential, critical pitting temperature |
|
|
 |
|
