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

Journal Article · Thu May 01 00:00:00 EDT 1997 · Corrosion (Houston)

DOI:https://doi.org/10.5006/1.3280483· OSTI ID:900488

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

---

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/m2 (5.2 A-h/ft2). Bond strengths for all samples started to decrease after ≈ 600 kcoul/m2 (15.5 A-h/ft2). 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; Oregon Department of Transportation, Salem, OR
• Sponsoring Organization: Oregon Department of Transportation, Salem, OR; USDOE - Office of Fossil Energy (FE)
• OSTI ID: 900488
• Report Number(s): DOE/ARC-1997-007
• Journal Information: Corrosion (Houston), Journal Name: Corrosion (Houston) Journal Issue: 5 Vol. 53; ISSN 0010-9312
• Publisher: NACE International, Houston, TX
• 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
anode
arc-sprayed zinc
bond strength
bridges
cathodic protection
electrochemical impedance spectroscopy
impressed current
interfacial chemistry
reinforced concrete
thermal-sprayed zinc
water permeability