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Li對純Al在酸性NaCl水溶液中腐蝕行為的影響
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1沈陽航空航天大學(xué),沈陽航空航天大學(xué),1沈陽航空航天大學(xué),1沈陽航空航天大學(xué),1沈陽航空航天大學(xué)

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中圖分類號:

TG174.41

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國家自然科學(xué)基金資助(項目號51301113)


Influence of Li to Electrochemical Corrosion Behavior for Pure Al in Acidic NaCl Solution
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Shenyang Aerospace University,Institute of Materials Science and Technology,Shenyang Aerospace University,Institute of Materials Science and Technology,Shenyang Aerospace University,Institute of Materials Science and Technology,Shenyang Aerospace University,Institute of Materials Science and Technology,Shenyang Aerospace University

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    摘要:

    真空熔煉制備1wt%和2wt%Li的Al-Li二元模型合金，研究Li含量對其在0.1MNaCl+0.01MH2SO4酸性水溶液中電化學(xué)腐蝕行為的影響。采用自腐蝕電位和電化學(xué)阻抗（EIS）評價純Al、Al-1Li和Al-2Li合金的耐蝕性能，結(jié)合X射線光電子能譜（XPS）和Mott-Schottky（M-S）曲線對三種試樣表面腐蝕產(chǎn)物膜成分和半導(dǎo)體特征進(jìn)行分析。結(jié)果表明1wt%和2wt%Li使純Al自腐蝕電位負(fù)移的同時，耐蝕性有所提高。合金元素Li參與腐蝕產(chǎn)物膜的形成，以Li2O的形式摻雜于Al2O3為主要成分的腐蝕產(chǎn)物膜中，沒有改變腐蝕產(chǎn)物膜的n型半導(dǎo)體特征；但Li2O摻雜引起膜內(nèi)氧空位濃度的降低，是Li提高純Al耐蝕性的主要原因。

    Abstract:

    Influence of 1wt% and 2wt% Li addition on the electrochemical corrosion behavior of pure Al was studied in 0.1MNaCl+0.01MH2SO4 acidic solution. Corrosion resistance was tested by free corrosion potential and electrochemical impedance spectrum (EIS). The composition and semiconducting properti of corrosion product films for pure Al, Al-1Li alloy and Al-2Li alloy formed at free corrosion potential were respectively analyzed by X-ray photoelectron spectroscopy (XPS) and Mott-Schottky (M-S) approach. The results showed that free corrosion potential of pure Al shifted in more active direction by Li addition, while its corrosion resistance was improved. Li, with high chemical activity, could participate in the film formation process and Li2O together with Al2O3 were existed in the product films. M-S plots revealed that Li addition did not change n-type semiconductor of corrosion product film on pure Al. But, the increasing of corrosion resistance was attributed to the decreasing of oxygen vacancy concentration in corrosion product films by Li addition to pure Al.

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王赫男,劉春忠,魯玲,栗仁山,林地. Li對純Al在酸性NaCl水溶液中腐蝕行為的影響[J].稀有金屬材料與工程,2018,47(5):1445~1450.[Wang Henan, Liu Chunzhong, Lu Ling, Li Renshan, Lin Di. Influence of Li to Electrochemical Corrosion Behavior for Pure Al in Acidic NaCl Solution[J]. Rare Metal Materials and Engineering,2018,47(5):1445~1450.]
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  • 收稿日期:2016-04-18
  • 最后修改日期:2016-06-30
  • 錄用日期:2016-07-15
  • 在線發(fā)布日期: 2018-06-08
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