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Open AccessArticle

Microstructure Evolution of a Magnesium Phosphate Protective Layer on Concrete Structures in a Sulfate Environment

1,2,3, 1,3,*, 1,3 and 1,3
1
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221008, China
2
School of Civil Engineering and Architecture, Kaifeng University, Kaifeng 475004, China
3
School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221008, China
*
Author to whom correspondence should be addressed.
Coatings 2018, 8(4), 140; https://doi.org/10.3390/coatings8040140
Received: 6 February 2018 / Revised: 2 April 2018 / Accepted: 2 April 2018 / Published: 14 April 2018
(This article belongs to the Special Issue Advanced Coatings for Corrosion Protection in Extreme Environments)
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Abstract

This study investigates the resistance of an uncoated magnesium phosphate cement (MPC) protective layer to sulfate attacks through changes in its compressive strength and appearance. X-ray Diffraction (XRD) and scanning electron microscopy (SEM) microanalyses are conducted on the MPC layer concrete both before and after etching, where changes in the microstructure of the magnesium phosphate protective layer are analyzed during the corrosion process. In addition, this study also explores the intrinsic mechanisms of the MPC protective layer in terms of the resistance of concrete to sulfate. The results showed that the erosion resistance of the concrete to sulfate can be dramatically improved by the MPC protective layer. The structure and composition of the MPC protective layer are different in the sulfate erosion environment compared with those exposed to other environments: the protective layer is more closely bonded to the concrete and has a more compact structure. Therefore, the MPC protective layer is verified to have a significant protective effect on concrete against sulfate corrosion. View Full-Text
Keywords: magnesium phosphate; coating; sulfate; corrosion; protection magnesium phosphate; coating; sulfate; corrosion; protection
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Li, J.; Ji, Y.; Huang, G.; Zhang, L. Microstructure Evolution of a Magnesium Phosphate Protective Layer on Concrete Structures in a Sulfate Environment. Coatings 2018, 8, 140.

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