Uniform corrosion of titanium in alkaline hydrogen peroxide conditions: influence of transition metals and inhibitors calcium and silicate
✍ Scribed by J. Rämö; K. Saarinen; M. Sillanpää
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- German
- Weight
- 127 KB
- Volume
- 53
- Category
- Article
- ISSN
- 0947-5117
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Uniform corrosion of titanium was studied in alkaline hydrogen peroxide environments simulating pulp bleaching conditions. Corrosion rates of unalloyed Grade 2 and alloyed Grade 5 were determined as a function of hydrogen peroxide anion (HOO^−^) concentration. Influences of calcium and silicate inhibitors and iron and manganese were investigated. Without inhibition titanium corroded at HOO^−^ content of 200 mg/l: Grade 2 0.4 mm/y and Grade 5 1.4 mm/y. Addition of calcium (Ca^2+^) and silicate (SiO~3~^2−^) diminished the corrosion of Grade 2 to critical anion level 400 mg/l, but could not protect Grade 5 even at the HOO^−^ concentration of 300 mg/l. Presence of iron and manganese raised the critical levels of the both grades. High HOO^−^ anion level was observed as a notable potential difference between titanium and platinum.