MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Use of Laser Irradiation to Form Anti-Corrosive Surface Oxide Layer on Mg Metal
Shogo IzumiMichiaki YamasakiMasaaki OtsuYoshihito Kawamura
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2007 Volume 48 Issue 7 Pages 1965-1968

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Abstract

Laser irradiation was used to improve the poor corrosion resistance of commercial grade pure magnesium (99.9 mass%) metal. The magnesium metal plates were immersed in a saturated Mg(OH)2 aqueous solution and the hydroxide layer formed on the plates was decomposed by laser-irradiation in air to form a uniform anti-corrosive oxide layer. Light scanning confocal microscopy (LSCM) was used to measure the thickness of the oxide layer and characterize the surface morphology of the laser-irradiated specimens. Corrosion resistance of the laser-irradiated specimens was evaluated by the method of hydrogen evolution during immersion using a 1 mass% NaCl aqueous solution. This study revealed that low speed-scanning with a low heat-input laser formed a thick, uniform MgO layer by decomposition of the Mg(OH)2 formed by primary immersion. The MgO layer prevented filiform corrosion and improved corrosion resistance of Mg metal.

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© 2007 The Japan Institute of Light Metals
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