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Field Evaluation of Cathodic Protection Index for Bare and Coated Steel in Seawater

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Polarization measurements were conducted over a 21-year period on bare and coated steel "H" pilings 6 inch by 6 inch by 30 feet (15.2 cm by 15.2 cm by 9.1 m) installed in seawater. A DC power source was used to shift from the corrosion potential of each pile to -0.85V. The amount of potential shift was recorded as 6V. The current (6I) required to shift the potential was measured, and a nonlinear pseudoresistance (6V/6I), called the Cathodic Protection Index (CPI), was calculated. The CPI was compared with the coating condition of the steel pilings as determined visually using ASTM standards. Results of these tests will be presented and discussed.

Product Number: 51393-93528-SG
Author: V. Van Blaricum and A. Kumar
Publication Date: 1993
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Picture for Performance of Coatings in Seawater: A Field Study
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Performance of Coatings in Seawater: A Field Study

Product Number: 51393-93439-SG
Author: A. Beitelman, v. L. Van Blaricum, A. Kumar
Publication Date: 1993
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Various polymeric coatings have been exposed to natural saltwater environments in Buzzard' s Bay, MA and at La Costa Island, FL for the last 18 years and 21 years respectively.   The coating systems were applied to 8 inch (20.32 cm) by 8 inch (20.32 cm) by 40 feet (12.19 m) A36 steel "H" pilings. The depth of the water ranged from 4 feet (1.22 m) to 8 feet (2.44 m). Periodic visual inspections have been conducted to evaluate the performance of the coating/ primer systems in the splash zone and in the immersed zone.      The coatings had windows to evaluate the under film corrosion attack by saltwater present near the Cape Cod canal. The coatings were evaluated according to ASTM visual standards at low tide. Results of the coating inspections and an evaluation of their effectiveness in preventing the corrosion of steel pilings in seawater will be presented.
Picture for Corrosion Control of Pilings in Seawater: Buzzards Bay, Ma
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Corrosion Control of Pilings in Seawater: Buzzards Bay, Ma

Product Number: 51384-84345-SG
Author: A. Kumar, A. Beitelman, E. Meronyk
Publication Date: 1984
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This report assesses (1) the rate of corrosion of bare steel with and without cathodic protection, and (2) the effectiveness of various commercially avail­ able coating systems in preventing corrosion of steel piles in seawater. Eighteen coatings and four sacrificial anodes were tested on 24 sets (three piles per set) of ASTM A 36 or ASTM 690 steel H-piles exposed for 5 years at Buzzards Bay, Massachusetts. Performance ratings were established for the following coatings: organic, organic over metal-filled, organic over metal­ filled with cathodic protection, metallic organic over metallic, and organic with cathodic protection. It is concluded that sacrificial anodes of zinc and aluminum effectively reduced the corrosion rate of bare carbon steel (ASTM 36) piles in the immersed zone from 0.076-0.102 mm/yr (3-4 mils/yr) to zero, and the coating performing best was coal tar epoxy over zinc-rich primer.
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06516 EVALUATION OF ANTIFOULING COATINGS PERFORMANCE TO PROTECT CARBON STEEL AGAINST MIC AND BIOFOULING IN POLLUTED SEAWATER

Product Number: 51300-06516-SG
ISBN: 06516 2006 CP
Author: Liz Karen Herrera, Carlos A. Giudice, Héctor A.Videla
Publication Date: 2006
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Performance of formulations of antifouling coatings to protect carbon steel from effects of microbiologically influenced corrosion (MIC) and marine biofouling in a tropical harbor seawater was assessed by field and laboratory experiments.  • Scanning electron microscopy (SEM).  • Energy dispersive spectroscopy (EDS). • X-ray diffraction (XRD). • Seawater immersion.
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