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Studying the Effect of Wind Direction and Specimen Orientation on the Corrosion of 1018 Steel using an Octagonal Prism Portable Exposure Rack

A portable exposure rack (PER) was devised to assess atmospheric corrosion in a marine environment as a function of wind direction and specimen orientation. Specimens in quadruplet were oriented facing north northeast east southeast south southwest west northwest up and down. Wind direction and speed and chloride deposition rates were also monitored in all of the directions and orientations. Corrosion rates were determined as well as the identification of the corrosion products for all orientations using X-ray diffraction. Statistical analyses was conducted to determine if the corrosion rates were correlated to wind directions and specimen orientations. The PER was in the shape of an octagonal prism (OP) with eight vertical faces for each of the cardinal and intercardinal directions and two horizontal faces for the up and down orientations. The OP PER was sheltered under an octagonal roof and supported on a fiberglass rod in a concrete base with a footprint of approximately 30 cm x 30 cm. In this example the OR PER was very useful to characterize the corrosivity of a marine environment for 1018 plain carbon steel. The results indicated the most corrosive vertical orientation was northeast which corresponded to the predominant trade winds and the more corrosive horizontal orientation was facing up. The corrosion rates were also correlated to the chloride deposition rates for the various directions and orientations.

Product Number: 51319-12734-SG
Author: Lloyd Hihara
Publication Date: 2019
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$20.00
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