Corrosion of ultra-high-purity Mg in 3.5 % NaCl solution saturated with Mg(OH)₂

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• 作者：Fuyong Cao ; Zhiming Shi ; Joelle Hofstetter ; Peter J. Uggowitzer ; Guangling Song ; Ming Liu ; Andrej Atrens
• 关键词：A. Magnesium ; B. Weight loss ; B. SEM
• 刊名：Corrosion Science
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：75
• 期：Complete
• 页码：78-99
• 全文大小：4062 K

文摘

Corrosion was evaluated for ultra-high-purity magnesium (Mg) immersed in 3.5 % NaCl solution saturated with Mg(OH)₂. The intrinsic corrosion rate measured with weight loss, P_W = 0.25 ¡À 0.07 mm y^?1, was slightly smaller than that for high-purity Mg. Some specimens had somewhat higher corrosion rates attributed to localised corrosion. The average corrosion rate measured from hydrogen evolution, P_AH, was lower than that measured with weight loss, P_W, attributed to dissolution of some hydrogen in the Mg specimen. The amount of dissolution under electrochemical control was a small amount of the total dissolution. A new hydride dissolution mechanism is suggested.