Improving the corrosion properties of magnesium AZ31 alloy GTA weld metal using microarc oxidation process
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第5期
论文作者：M.Siva Prasad M.Ashfaq N.Kishore Babu A.Sreekanth K.Sivaprasad V.Muthupandi
文章页码：566 - 573
摘 要：In this work,the morphology,phase composition,and corrosion properties of microarc oxidized（MAO） gas tungsten arc（GTA） weldments of AZ31 alloy were investigated.Autogenous gas tungsten arc welds were made as full penetration bead-on-plate welding under the alternating-current mode.A uniform oxide layer was developed on the surface of the specimens with MAO treatment in silicate-based alkaline electrolytes for different oxidation times.The corrosion behavior of the samples was evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy.The oxide film improved the corrosion resistance substantially compared to the uncoated specimens.The sample coated for 10 min exhibited better corrosion properties.The corrosion resistance of the coatings was concluded to strongly depend on the morphology,whereas the phase composition and thickness were concluded to only slightly affect the corrosion resistance.
M.Siva Prasad1,2，M.Ashfaq3，N.Kishore Babu4，A.Sreekanth5，K.Sivaprasad2，V.Muthupandi2
1. Department of Advanced Materials Engineering,Dong-Eui University2. Advanced Materials Processing Laboratory,Department of Metallurgical and Materials Engineering,National Institute of Technology3. FARCAMT,Advanced Manufacturing Institute,King Saud University4. Empa,Swiss Federal Laboratories for Materials Science and Technology,Laboratory for Advanced Materials Processing5. Department of Chemistry,National Institute of Technology
摘 要：In this work,the morphology,phase composition,and corrosion properties of microarc oxidized（MAO） gas tungsten arc（GTA） weldments of AZ31 alloy were investigated.Autogenous gas tungsten arc welds were made as full penetration bead-on-plate welding under the alternating-current mode.A uniform oxide layer was developed on the surface of the specimens with MAO treatment in silicate-based alkaline electrolytes for different oxidation times.The corrosion behavior of the samples was evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy.The oxide film improved the corrosion resistance substantially compared to the uncoated specimens.The sample coated for 10 min exhibited better corrosion properties.The corrosion resistance of the coatings was concluded to strongly depend on the morphology,whereas the phase composition and thickness were concluded to only slightly affect the corrosion resistance.
关键词：
