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Volume 6 Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212 Advanced Materials 2018
September 04-06, 2018
September 04-06, 2018 | Zürich, Switzerland
21st International Conference on
Advanced Materials & Nanotechnology
Anticorrosive performance of the scratched coating systems on carbon steel in marine environment
by electrochemical technique
Hongling Li, Xia Zhao and Baorong Hou
Chinese Academy of Science, China
In practice engineering, defects were inevitable for protective coating systems on steel surface. In this paper, a composite
coating system, including primer, middle coat as well as top coat were used to protect the carbon steel against corrosion
in marine environment. Among them, two environmental additives, glass fibers and thiourea were applied in middle coat to
modify the coating system. The long-term corrosion durability and the self-healing ability of the scratched coating system
were evaluated by multiple methods. Results of electrochemical technologies indicated that the coating system containing 0.5
wt.% fibers and 0.5 wt.% thiourea presented a good performance of corrosion protection and self-healing for carbon steel as
immersing in 3.5% NaCl for 120 days. The evolution of localized corrosion factor with time obtained from current distribution
showed that fibers combined with thiourea could effectively inhibit the occurrence of the local corrosion for the scratched
coating systems and greatly delay the development of corrosion process. Surface characterization suggested that adequate of
thiourea could be uniformly absorbed on fibers for a long time to play an important role in protecting the carbon steel. At last,
the schematic models were established to demonstrate the action of fibers and thiourea on the exposed surface of the carbon
steel and the scratched coating system in the whole deterioration process.
Res. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C3-021