Journal
CORROSION SCIENCE
Volume 194, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109942
Keywords
Zinc powders; Zinc-rich coating; SVET; Self-corrosion; Active protection
Funding
- National Natural Science Foundation of China [21978036, 21703026, 21403030]
- Key R&D Project of Ningxia Hui Autonomous Region [2019BFG02016]
- Post-doctoral Initial Funding of Liaoning Province [2019-BS-046]
- Beijing Scholars Program [022]
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Research has shown that the self-corrosion of zinc fillers can influence the protective behavior of zinc-rich coatings and enhance their shielding effect. This finding is important for enriching the protective theory of zinc-rich coatings.
Protection performance of zinc-rich coatings is generally ascribed to sacrificial anode protection and physical shielding derived from corrosion products, neglecting the contribution of zinc fillers' self-corrosion. This work clarifies the fact that self-corrosion of zinc powders can induce active protection behaviour of zinc-rich coatings by chemical conversion for corrosive media, firstly building chemical shielding function, and then enhancing physical shielding protection during the formation of zinc corrosion products. Chemical and physical shielding effects enhance shielding performance of zinc-rich coatings and extend its cathodic protection life. The result is beneficial to enrich protection theory of zinc-rich coatings.
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