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Materials 2017, 10(11), 1262; https://doi.org/10.3390/ma10111262

Evolution of Akaganeite in Rust Layers Formed on Steel Submitted to Wet/Dry Cyclic Tests

1
Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Wencui Rd. 62, Shenyang 110016, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Analysis and Testing Department (Testing Center), Institute of Metal Research, Chinese Academy of Sciences, Wenhua Rd. 72, Shenyang 110016, China
*
Author to whom correspondence should be addressed.
Received: 14 September 2017 / Revised: 26 October 2017 / Accepted: 28 October 2017 / Published: 2 November 2017
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Abstract

The evolution of akaganeite in rust layers strongly impacts the atmospheric corrosion behavior of steel during long-term exposure; however, the factors affecting the evolution of akaganeite and its mechanism of formation are vague. In this work, wet-dry cyclic corrosion tests were conducted to simulate long-term exposure. Quantitative X-ray diffraction analysis was employed to analyze variations in the relative amounts of akaganeite; scanning electron microscopy and electron probe microanalysis were used to study the migration of relevant elements in the rust layer, which could help elucidate the mechanism of akaganeite evolution. The results indicate that the fraction of akaganeite tends to decrease as the corrosion process proceeded, which is a result of the decrease in the amount of soluble chloride available and the ability of the thick rust layer to block the migration of relevant ions. This work also explores the location of akaganeite formation within the rust layer. View Full-Text
Keywords: atmospheric corrosion; accelerated experiments; chloride; carbon steel atmospheric corrosion; accelerated experiments; chloride; carbon steel
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Xiao, H.; Ye, W.; Song, X.; Ma, Y.; Li, Y. Evolution of Akaganeite in Rust Layers Formed on Steel Submitted to Wet/Dry Cyclic Tests. Materials 2017, 10, 1262.

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