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Application of Electrochemical Noise to Identify Corrosion Development of Steel with Galvanized Protective Coatings

Picture for Application of Electrochemical Noise to Identify Corrosion Development of Steel with Galvanized Protective Coatings
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Galvanized protective coatings have been used for structural steel to mitigate steel corrosion in atmospheric exposures and chloride-rich marine environments. The galvanizing process involves dipping steel elements free of surface mill scale in a molten zinc bath where the diffusion of zinc into the steel matrix allows for zinc-iron alloy layers of decreasing zinc concentrations by depth to form in the steel. Oher elements such as tin, antimony and aluminum may be added to the galvanizing bath to control reaction rates, surface appearance and corrosion behavior. Hot-dipped galvanizing provides corrosion protection by developing a barrier layer and in certain conditions provide beneficial galvanic coupling of the zinc-rich layers to the steel.

Product Number: 51322-17873-SG
Author: Samanbar Permeh, Kingsley Lau
Publication Date: 2022
Industries: Cathodic Protection , Coatings and Linings , Corrosion Monitoring and Control , Coatings
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$20.00
$20.00

Protective coatings for structural steel bridges include galvanized steel. The zinc alloy layers of galvanized steel provide beneficial galvanic coupling with the steel substrate to mitigate corrosion activity. However, coating defects exposing the steel substrate to the chloride exposure environments can affect the zinc corrosion activity and thus the mitigation of steel corrosion. Electrochemical measurements including open-circuit potential, linear polarization resistance, and the electrochemical noise (EN) technique were conducted on coated steel plates with defects subjected to various chloride solutions to identify the zinc activity and steel corrosion. The EN testing was used to identify the local electrochemical activity of the zinc and the steel substrate and corrosion mitigation afforded by the coatings when subjected to a chloride solution.

Protective coatings for structural steel bridges include galvanized steel. The zinc alloy layers of galvanized steel provide beneficial galvanic coupling with the steel substrate to mitigate corrosion activity. However, coating defects exposing the steel substrate to the chloride exposure environments can affect the zinc corrosion activity and thus the mitigation of steel corrosion. Electrochemical measurements including open-circuit potential, linear polarization resistance, and the electrochemical noise (EN) technique were conducted on coated steel plates with defects subjected to various chloride solutions to identify the zinc activity and steel corrosion. The EN testing was used to identify the local electrochemical activity of the zinc and the steel substrate and corrosion mitigation afforded by the coatings when subjected to a chloride solution.

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Aesthetic Issues With Spray-Applied Fluoropolymer Coating System

Product Number: 51322-17971-SG
Author: Kimberly Steiner
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A building, partially clad in fluoropolymer coated aluminum panels, was observed to have an aesthetically unacceptable appearance while still under construction. Once installed on the building, many of the panels exhibited a vertical streaked appearance under certain conditions. When the panels were at ground level, or when the sun was bright, the streaky appearance was not noticeable. However, in conditions of low light, such as during early morning, dusk, or on cloudy days the streaky appearance was reported to become apparent. A visual mock-up, consisting of multiple coated panels that had been approved by the architect as a guide to the anticipated appearance were also present on-site as a reference. This visual mock-up was used as a reference for acceptable appearance of the coated panels.  
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