Investigation on the Effects of Magnetic Field on Bromide-Induced Pitting of Commercially Pure Titanium
Publish place: 10th Iranian National Corrosion Congress
Publish Year: 1386
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
INCC10_057
تاریخ نمایه سازی: 4 اسفند 1387
Abstract:
In chloride salt solutions, titanium alloys exhibit reasonably high pitting potentials as high as +10 V (vs. AglAgCI) at room temperatures. On the other hand. anodic pitting potentials are significantly lower in bromide solutions. In this study, pitting corrosion of commercially pure titanium in aqueous NaBr solution of 0.1 M concentration at room
temperature was studied and the effect of an external magnetic field oriented both parallel and perpendicular to electrode surfilce was investigated. Cyclic potentiodynamic and potentiostatic polarization tests were carried out. Anodic breakdown potential of+1.4 V (w. AglAgCl) obtained in the absence of magnetic field, decreasing to +1.1 V in the presence of a 0.05 T parallel magnetic field. The perpendicular magnetic :field actually did not affect the breakdown potential. Applying of an external magnetic field, independent of its orientation, shifted the repassivation potential 100 mV in the positive direction. SEM microscopy observations of sample s1.u':taces indicated that applying of magnetic field results in some variations in the pit shapes and their sizes.
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Authors
Hassan Fattahi
MSc. Student, Department of Materials Science and Engineering,Shiraz University
Mohammad Hossain Shariat
Professor, Department of MDterials Science and Engineering. Shiraz University,