| Corrosion action and passivation mechanism of magnesium alloy in fluoride solution | |
| Alternative Title | Corrosion action and passivation mechanism of magnesium alloy in fluoride solution |
| Li Jianzhong1; Huang Jiugui2; Tian Yanwen1; Liu Changsheng1 | |
| 2009 | |
| Source Publication | TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
 |
| ISSN | 1003-6326 |
| Volume | 19Issue:1Pages:50-54 |
| Abstract | 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. |
| Other Abstract | 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. |
| Keyword | magnesium alloy passive film corrosion fluoride nickel sulfate |
| Indexed By | CSCD |
| Language | 英语 |
| CSCD ID | CSCD:3563621 |
| Citation statistics |
Cited Times:12[CSCD]
[CSCD Record]
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| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/156407 |
| Collection | 中国科学院金属研究所 |
| Affiliation | 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 |
| 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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