Titanium Anodes in Cathodic Protection.
Abstract
The objective of this investigation was to determine the environmental limitations of anode grade titanium used for impressed cathodic protection systems. The pitting behavior of titanium anode substrates (99 percent pure) was investigated as a function of chloride content in both distilled and tap water. This work provided information about the voltage limits of platinum- or ceramic-coated, titanium-impressed current anodes. At NaCl concentrations of up to 0.0055 percent, the breakdown voltage of titanium was found to be in excess of 80 V in tap water. It is recommended that anodic potential not exceed 9.17 V (SCE) when platinum- or ceramic-coated titanium anodes are used for impressed current cathodic protection. This voltage reflects the worst case pitting behavior encountered in high chloride solutions (3.5 percent or 35,000 ppm NaCl) and operation of anodes below this potential insures that pitting of titanium anodes will not occur in fresh water such as the Ohio River, which has much lower chloride content (28 ppm). (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1982
- Accession Number
- ADA111366
Entities
People
- Avinash Kumar
- E. G. Segan
- Jennie Bukowski
Organizations
- Construction Engineering Research Laboratory