Corrosion action and passivation mechanism of magnesium alloy in fluoride solution

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	Corrosion action and passivation mechanism of magnesium alloy in fluoride solution
其他题名	Corrosion action and passivation mechanism of magnesium alloy in fluoride solution
	Li Jianzhong 1; Huang Jiugui 2; Tian Yanwen 1; Liu Changsheng 1
	2009
发表期刊	TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
ISSN	1003-6326
卷号	19 期号:1 页码:50-54
摘要	Corrosion action and passive mechanism of magnesium alloy in the fluoride solution were studied by means of scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy(EDS), and electrochemistry methods. The results show that an insoluble MgF(2) film is generated on the surface of magnesium alloy activated in the hydrofluoric acid. And the mass of the deposited MgF(2) film may reach a constant value, when the mass ratio of Mg/F on the magnesium alloy surface is fixed at 11.3:1. The activated magnesium alloy gains a 'passivation state' in a mixture of sulfuric acid and hydrofluoric acid at a volume ratio of less than 1.2. At the same time the mass of magnesium alloy is maintained as a function of the time. When the ratio is above 1.4, the mass of magnesium alloy rapidly decreases. The passive film formed through adsorption of HF(2)(-) (or H(2)F(3)(-), H(3)F(4)(-)) ions by the deposited MgF(2) film can protect the magnesium alloy from corrosion in fluoride solution, but not in non-fluoride solutions. The passive state is maintained for activated magnesium alloy in an acidic sulfuric nickel solution with added fluoride. If fluoride and carbonate are added to the acidic sulfuric nickel solution, a replacement reaction between magnesium alloy and solution takes place.
其他摘要	Corrosion action and passive mechanism of magnesium alloy in the fluoride solution were studied by means of scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy(EDS), and electrochemistry methods. The results show that an insoluble MgF_2 film is generated on the surface of magnesium alloy activated in the hydrofluoric acid. And the mass of the deposited MgF_2 film may reach a constant value, when the mass ratio of Mg/F on the magnesium alloy surface is fixed at 11.3-1. The activated magnesium alloy gains a 'passivation state' in a mixture of sulfuric acid and hydrofluoric acid at a volume ratio of less than 1.2. At the same time the mass of magnesium alloy is maintained as a function of the time. When the ratio is above 1.4, the mass of magnesium alloy rapidly decreases. The passive film formed through adsorption of HF_2~- (or H_2F_3~-, H_3F_4~-) ions by the deposited MgF_2 film can protect the magnesium alloy from corrosion in fluoride solution, but not in non-fluoride solutions. The passive state is maintained for activated magnesium alloy in an acidic sulfuric nickel solution with added fluoride. If fluoride and carbonate are added to the acidic sulfuric nickel solution, a replacement reaction between magnesium alloy and solution takes place.
关键词	magnesium alloy passive film corrosion fluoride nickel sulfate
收录类别	CSCD
语种	英语
CSCD记录号	CSCD:3563621
引用统计	被引频次：13[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/156407
专题	中国科学院金属研究所
作者单位	1.中国科学院金属研究所 2.Baosteel Co Ltd, Steel Sheet Cold Rolling Plant, Baosteel Branch, Shanghai 200431, Peoples R China
推荐引用方式 GB/T 7714	Li Jianzhong,Huang Jiugui,Tian Yanwen,et al. Corrosion action and passivation mechanism of magnesium alloy in fluoride solution[J]. TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,2009,19(1):50-54.
APA	Li Jianzhong,Huang Jiugui,Tian Yanwen,&Liu Changsheng.(2009).Corrosion action and passivation mechanism of magnesium alloy in fluoride solution.TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,19(1),50-54.
MLA	Li Jianzhong,et al."Corrosion action and passivation mechanism of magnesium alloy in fluoride solution".TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA 19.1(2009):50-54.