Corrosion action and passivation mechanism of magnesium alloy in fluoride solution
查看参考文献16篇
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文摘
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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. |
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来源
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Transactions of Nonferrous Metals Society of China
,2009,19(1):50-54 【核心库】
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DOI
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10.1016/s1003-6326(08)60227-7
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关键词
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magnesium alloy
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passive film
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corrosion
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fluoride
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nickel sulfate
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地址
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1.
School of Metallurgy and Materials, Northeastern University, Liaoning, Shenyang, 110004
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Steel Sheet Cold Rolling Plant, Baosteel Branch, Baosteel Co., Ltd., Shanghai 200431, China, Shanghai, 200431
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1003-6326 |
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学科
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金属学与金属工艺 |
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基金
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the Post-docotorate Fund of Northeastern University, China
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文献收藏号
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CSCD:3563621
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