Study on the Electrochemical Polarization and Stress Corrosion Cracking Behaviors of Alloy 690 in 5M Chloride Solutions at 25℃

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Title:	Study on the Electrochemical Polarization and Stress Corrosion Cracking Behaviors of Alloy 690 in 5M Chloride Solutions at 25℃ 690合金在25℃的5M NaCl溶液中之電化學極化與應力腐蝕行為研究
Authors:	陳彥羽周良賓施漢章
Contributors:	化材系
Keywords:	電位與pH值關係圖 690合金循環極化孔蝕均勻腐蝕鈍態慢速應變拉伸試驗 Potential-pH diagram Cyclic polarization Pitting corrosion General corrosion Passivation, SSRT
Date:	2005-12
Issue Date:	2017-03-15 11:28:49 (UTC+8)
Abstract:	An experimental, potential-pH diagram was constructed for the nickel-based Alloy 690 in 25℃ concentrated (5M) sodium chloride solution, using an cyclic polarization method. The domains of immunity, general corrosion, passivation, and pitting in 5M NaCl solutions were defined. At pH＞4 the passive region subdivided into areas of perfect passivation, imperfect passivation, and pitting. After anodic polarization, the surface of each specimen was carefully examined metallographically. Pitting corrosion was observed over the entire pH range investigated (0.3-8.52) but general corrosion predominated at lower pH values (＜3). On the other hand, the mechanical properties, such as ultimate tensile strength (UTS), strain at fracture and the reduction area (RA) measured by the slow strain rate test (SSRT), decreased significantly at pH＜3. The SSRT results are consistent with fractography and side-view observations of the tested specimens by SEM.
Relation:	防蝕工程； 19卷4期 (2005 / 12 / 01) ， P523 - 539
Appears in Collections:	[Department of Chemical & Materials Engineering] journal articles

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