A thermal sprayed titanium anode for cathodic protection of reinforced concrete structures

Book · Fri Dec 01 04:00:00 EST 1995

OSTI ID:128745

Bennett, J E; Schue, T J ^[1]; McGill, G ^[2]

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1. ELTECH Research Corp., Fairport Harbor, OH (United States)
2. Oregon Dept. of Transportation, Salem, OR (United States)

A thermally sprayed titanium-based anode has been developed for cathodic protection of reinforced concrete structures. A thin, tightly adherent coating of titanium may be applied to concrete by plasma spray, flame spray, or arc spray techniques. Deposit efficiency is high, generally between 60% and 80%, and titanium consumption ranges from 320 to 540 g/m{sup 2} (30 to 50 g/ft{sup 2}) for a coating with good current distribution. Deposit efficiency and titanium consumption are improved at low stand-off, high carrier gas pressure, and fast application rate. The use of nitrogen also improves efficiency. Bond strengths of the titanium coating are inherently high, and usually exceed the tensile strength of the base concrete. Safety and environmental concerns related to thermal spray of titanium appear to be minimal. A process has also been developed for catalysis of the titanium coating which results in long-term operation at low anodic potentials, about 500--600 mV versus a saturated calomel reference electrode. The catalyst is applied after the titanium is deposited, and may be easily re-applied in the future if necessary. This anode is expected to be especially useful where concrete overlays are undesirable and where long life and durability are important.

• OSTI ID: 128745
• Report Number(s): CONF-950304--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIR
ANODES
ARGON
BONDING
CATHODIC PROTECTION
EFFICIENCY
EXPERIMENTAL DATA
FLAME SPRAYING
HELIUM
MICROSCOPY
NITROGEN
PLASMA ARC SPRAYING
REINFORCED CONCRETE
SERVICE LIFE
TITANIUM