The effect of method of preparation on the corrosion resistance and catalytic activity during corrosion of tungsten carbide II. Changes in the catalytic activity of tungsten carbides during the corrosion process

✍ Scribed by I. Nikolov; T. Vitanov

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 499 KB
• Volume: 5
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(80)80007-3

✦ Synopsis

Sedimented electrodes were used for the investigation of the changes in the catalytic activity during corrosion in 4.5 and 9.9N HsS04 of tungsten carbides synthesized under different conditions.1 It is shown that during corrosion the specific activity of all the samples #udied reaches a maximum after a certain exposure time. The same phenomenon is observed also during the periodic contact of the corroding samples with hydrogen. The catalytic activity decreases with increase in the quantity of tungsten oxides formed during corrosion. In 4.5N HzS04 the specific activity of the tested samples is subjected to more pronounced changes. Corrosion processes lead to some exceptions in the general rule that carbides synthesized from WOs display a higher specific activity than those synthesized from HzWOI (w).