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ZrO2 coatings

Time:2019-06-19 15:50:43  From:  Author:

 Carbon fibers reinforced magnesium matrix composites (Cf/Mgcomposites) have been broadly utilized in various domains due to their advantages of low density, excellent specific strength, and specific stiffness. There is an increasing interest in the use of Cf/Mg composites as structural materials for applications in aerospace and automotive industries where weight reduction is a critical factor, such as,the shell of rocket engines, the parabolic antenna skeleton of satellites,the automobile engine piston and the space anti-radiation components,etc. However, there is a big challenge in an exposure to moisture or saline environments because of a low standard electrode potential for magnesium-based materials . Cf/Mg composites are extremely vulnerable to be corroded. After corrosion, corrosion pits will appear on the surface of Cf/Mg composites, which will decrease the mechanical performance and greatly limits further applications. Additionally,regarding the Cf/Mg composites, severe micro-galvanic corrosion will occur between carbon fibers and magnesium substrate, causing a higher active state of Cf/Mg composites than magnesium alloys under the same corrosive conditions. As a result, Cf/Mg composites have a worse corrosion resistance than magnesium alloys. To solve this problem, application of coatings is one of the effective methods for the corrosion protection of Cf/Mg composites .Zirconium compounds, like ZrO2, are more resistant to corrosion because of their chemical inertness to most inorganic acids, hydroxides,and halides . It has been reported that ZrO2 coatings for anticorrosion applications are prepared by sol-gel , plasma spraying, plasma electrolytic deposition and sputtering . But pores and cracks are usually accompanied in these ZrO2 coatings, which cannot effectively prevent the matrix from the corrosion in a harsh corrosive environment. ZrB2 has the advantages of excellent corrosion resistance, good antioxidation properties and high strength at both normal and high temperatures, and thus could be introduced into ZrO2 coating, improving the corrosion performance. Onthe other hand, application of SiC to ZrB2 helps to improve the ability of thermal shock resistance and fracture toughness, as well as compactness.

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