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Corrosion action and passivation mechanism of magnesium alloy in fluoride solution

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文摘 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.
来源 Transactions of Nonferrous Metals Society of China ,2009,19(1):50-54 【核心库】
DOI 10.1016/s1003-6326(08)60227-7
关键词 magnesium alloy ; passive film ; corrosion ; fluoride ; nickel sulfate
地址

1. School of Metallurgy and Materials, Northeastern University, Liaoning, Shenyang, 110004  

2. Steel Sheet Cold Rolling Plant, Baosteel Branch, Baosteel Co., Ltd., Shanghai 200431, China, Shanghai, 200431

语种 英文
文献类型 研究性论文
ISSN 1003-6326
学科 金属学与金属工艺
基金 the Post-docotorate Fund of Northeastern University, China
文献收藏号 CSCD:3563621

参考文献 共 16 共1页

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引证文献 13

1 JIANG Yong-feng Microstructure and properties of oxalate conversion coating on AZ91D magnesium alloy Transactions of Nonferrous Metals Society of China,2009,19(6):1416-1422
被引 7

2 李绮 AZ31B镁合金表面氟涂层的生物相容性和抗菌性能 材料研究学报,2011,25(2):193-198
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