Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Highly-Orientated Sericite Nanosheets in Epoxy Coating for Excellent Corrosion Protection of AZ31B Mg Alloy

Version 1 : Received: 6 June 2023 / Approved: 6 June 2023 / Online: 6 June 2023 (09:32:40 CEST)

A peer-reviewed article of this Preprint also exists.

Wu, H.; Xi, K.; Huang, Y.; Zheng, Z.; Wu, Z.; Liu, R.; Zhou, C.; Xu, Y.; Du, H.; Yin, Y. Highly Orientated Sericite Nanosheets in Epoxy Coating for Excellent Corrosion Protection of AZ31B Mg Alloy. Nanomaterials 2023, 13, 2310. Wu, H.; Xi, K.; Huang, Y.; Zheng, Z.; Wu, Z.; Liu, R.; Zhou, C.; Xu, Y.; Du, H.; Yin, Y. Highly Orientated Sericite Nanosheets in Epoxy Coating for Excellent Corrosion Protection of AZ31B Mg Alloy. Nanomaterials 2023, 13, 2310.

Abstract

The growing demands of material longevity in marine environments necessitate the development of highly efficient, low-cost and durable corrosion protective coatings. Although magnesium alloys are widely used in the automotive and aerospace industries, severe corrosion issues still hinder their long-term service in naval architecture. In present work, an epoxy composite coating containing sericite nanosheets is prepared on the AZ31B Mg alloy by one-step electrophoretic deposition method to improve corrosion resistance. Due to the PEI modification, positively-charged sericite nanosheets can be highly orientated in an epoxy coating under the influence of an electric field. The sericite-incorporated epoxy coating prepared in the emulsion with 4 wt.% sericite exhibits the highest corrosion resistance in 3.5 wt.% NaCl solution, as manifested by electrochemical corrosion and long-term immersion tests. The highly-orientated sericite nanosheets in epoxy coating provide excellent barrier effect against corrosive media, thereby significantly improving the long-term anti-corrosion performance of the epoxy coating. This work provides new insight toward the design of lamellar filler/epoxy coatings with superior anticorrosion performance and shows promise in the corrosion protection of magnesium alloys.

Keywords

Magnesium; sericite; epoxy; corrosion; electrochemical

Subject

Chemistry and Materials Science, Surfaces, Coatings and Films

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