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首页> 外文期刊>Corrosion Engineering, Science and Technology >Laser cladding of Mg20Al80powder on ZM_5 magnesium alloy
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Laser cladding of Mg20Al80powder on ZM_5 magnesium alloy

机译：ZM_5镁合金上Mg20Al80粉体的激光熔覆

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摘要

Laser surface engineering can be used to alter the surface of alloys and produce a fine microstructure, usually improving the corrosion resistance and wear resistance. In the present paper, a CO_2 laser was used to melt preplaced Mg20Al80 powder with the objective of improving the corrosion resistance of ZM5 magnesium alloy in sea water solution. The corrosion behaviour of the ZM5 substrate and the laser cladding Mg20Al80 sample was studied with relating to their microstructures. Corrosion was studied in a 3.5 wt- percent NaCl solution at pH 7 by observing the corrosion morphology. The results showed that the Mg_(17)Al_(12) acted as galvanic cathode in both the ZM5 substrate and the cladding layer. The enhanced corrosion resistance was attributed to the fine dispersion of intermetailic phases and extended Al solid solutions by laser rapid solidification.
机译：激光表面工程可用于改变合金表面并产生精细的微观结构，通常可提高耐蚀性和耐磨性。为了提高ZM5镁合金在海水中的耐蚀性，本文采用CO_2激光熔化预放置的Mg20Al80粉末。研究了ZM5衬底和激光熔覆Mg20Al80样品的腐蚀行为及其微观结构。通过观察腐蚀形态，在pH为7的3.5 wt％NaCl溶液中研究了腐蚀。结果表明，Mg_（17）Al_（12）在ZM5衬底和覆层中均充当电流阴极。增强的耐腐蚀性归因于中间相的精细分散和通过激光快速凝固而扩展的Al固溶体。

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