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Corrosion action and passivation mechanism of magnesium alloy in fluoride solution
Alternative TitleCorrosion action and passivation mechanism of magnesium alloy in fluoride solution
Li Jianzhong1; Huang Jiugui2; Tian Yanwen1; Liu Changsheng1
2009
Source PublicationTRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
ISSN1003-6326
Volume19Issue:1Pages:50-54
AbstractCorrosion 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.
Other AbstractCorrosion 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.
Keywordmagnesium alloy passive film corrosion fluoride nickel sulfate
Indexed ByCSCD
Language英语
CSCD IDCSCD:3563621
Citation statistics
Cited Times:11[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/156407
Collection中国科学院金属研究所
Affiliation1.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
Recommended Citation
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.
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