ANODIC POLARIZATION OF TITANIUM IN FORMIC ACID
Abstract
The anodic behaviour of Ti in various concentra tions of formic acid was studied by means of voltage-time curves at constant current using a sensitive recorder to obtain the detailed shape of the curve. It was shown that, depending on electrolytic conditions, the Ti will either re main passive, micropit or corrode uniformly. The shape of the V-t curves in the micropitting region depends on concentration and temperature and many of the curves are characterized by a plateau in the region 7 - 12V. Optical studies of micropitting showed that different interfer ence colors form on different grains and that pits are initiated on the thinner oxide films. Elec tron microscopy revealed the formation of 'mounds' (solid or hollow) which appear to rupture at the breakdown potential at which mocropitting com mences. The uniform and dense distribution of micropits was explained on the basis of the for mation of blisters on the thinner oxide films resulting from stresses within the oxide.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1962
- Accession Number
- AD0410146
Entities
People
- H. Leckie
- L. L. Shreir