United States Department of Transportation
i
Effects of Service Life of Aluminized Steel Corrugated Pipe with Visible and Not Visible Coating Deficiencies within the Lock System
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2021-07-01
[PDF-5.44 MB]
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Edition:Final report
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Abstract:The electrochemical behavior of aluminized and galvanized steel is investigated to determine the corrosion performance of coating deficiencies generated within the lock-seams during the fabrication of aluminized and galvanized steel corrugated pipe. Electrochemical techniques and visual and profilometric analysis are used to assess the ability of the aluminum and zinc coating to provide sufficient galvanic protection to the underlying steel in the presence of a crevice. Also, crevice coupons and lock-seam samples were used in this investigation in different environmental conditions simulating natural water conditions to relate the corrosion rate with the level of protection that the coating will provide. In addition, a model was developed to identify the influence of the confined geometry of the lock-seam on the corrosion rates at a defect location. The results have shown that defects in the aluminum coating can act as initiation sites for the corrosion of the steel. However, defects located external to the lock-seam may corrode at higher rates than those within the lock-seams due to the limited availability of oxygen.
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