Journal
APPLIED SURFACE SCIENCE
Volume 645, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2023.158849
Keywords
Magnesium alloy; Cold-sprayed coating; Corrosion resistance; Layered double hydroxide; Reduced graphene oxide
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In this study, layered double hydroxide (LDH) and reduced graphene oxide (rGO) were incorporated into a Zn/Ni matrix coating on the surface of Mg alloys. The resulting GLG@Zn/Ni coating showed excellent corrosion resistance due to the homogeneously dispersed LDH/rGO network and the presence of Ni, with a high self-corrosion potential and low self-corrosion current density, leading to prolonged protection against corrosion.
In this work, layered double hydroxide (LDH) and reduced graphene oxide (rGO) were incorporated into Zn/Ni matrix coating by cold-spraying on the surface of Mg alloys. Inside the resulting GLG@Zn/Ni coating, LDH/rGO are homogeneously dispersed and inner-connected to a protective network. Compared with other coatings without LDH or rGO nanosheets, the GLG@Zn/Ni coating shows the best corrosion resistance, with a high self-corrosion potential at - 1.174 V (vs. - 1.471 V for Mg), a decent self-corrosion current density of 344.7 mu A center dot cm(-2) (vs. 878.3 mu A center dot cm(-2) for Mg), and the longest available protection (>720 h) against corrosion. Electrochemical and morphological characterizations reveal a synergistic effect of the coating compositions in enhancing corrosion resistance. In detail, the LDH/rGO network inside the coating restricts the penetration of the corrosive medium, particularly for LDH, which has the capacity to capture corrosive Cl- ions. Meanwhile, Ni promotes the conversion of Zn into passivation layers, which then spread to fill the corrosion pores and interphase cracks. This transformation ultimately leads the GLG@Zn/Ni coating to become a unified whole, providing excellent corrosion resistance.
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