Bond strength of electrochemically-aged arc-sprayed zinc coatings on concrete

Conference · Mon Jan 01 04:00:00 EST 1996

OSTI ID:900579

Covino, Jr, Bernard S; Bullard, Sophie J; Cramer, Stephen D; McGill, G E ^[1]; Cryer, C B ^[1]

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1. Oregon Dept. of Transportation, Salem, OR

Research was conducted to determine the effect of electrochemical aging on large-area arc-sprayed Zn anodes for cathodic protection (CP) of bridges and other reinforced concrete structures. The study focused on the influences of total charge passed and concrete surface preparation on bonding of Zn to the concrete. Half the samples were preheated prior to being arc-sprayed with Zn. The preheated samples had initial bond strengths 80% higher than the unheated samples. This difference became insignificant after = 200 kcoul/m[2] (5.2 A-h/ft[2]). Bond strengths for all samples started to decrease after = 600 kcoul/m[2] (15.5 A-h/ft[2]). Changes in bond strength were correlated with observed changes in permeability of the Zn coating to water, electrical behavior of the Zn-concrete interface, charge-transfer resistance, and chemical composition at the Zn- concrete interface.

• Research Organization: Albany Research Center (ARC), Albany, OR
• Sponsoring Organization: USDOE - Office of Fossil Energy (FE); U.S. Bureau of Mines
• OSTI ID: 900579
• Report Number(s): DOE/ARC-1996-006
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
ANODES
BONDING
CATHODIC PROTECTION
CHEMICAL COMPOSITION
COATINGS
CONCRETES
PERMEABILITY
REINFORCED CONCRETE
WATER
ZINC
adhesion
application
arc spraying
bridges
cathodic protection
chemical composition
corrosion protection
interface
reinforced concrete
sacrificial anode