最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

+高級檢索
燒結(jié)NdFeB永磁體的腐蝕行為研究
DOI:
作者:
作者單位:

中南大學 材料科學與工程學院,中南大學 材料科學與工程學院,湖南稀土新能源材料有限責任公司,湖南稀土新能源材料有限責任公司,湖南稀土新能源材料有限責任公司,中南大學 材料科學與工程學院

作者簡介:

通訊作者:

中圖分類號:

TG 172.9

基金項目:

長沙市科技計劃項目(項目號K1502018-11)


Corrosion behavior of sintered Nd-Fe-B magnets
Author:
Affiliation:

School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University,,,,School of Materials Science and Engineering,Central South University

Fund Project:

  • 摘要
    • |
  • 圖/表
    • |
  • 訪問統(tǒng)計
    • |
  • 參考文獻
    • |
  • 相似文獻
    • |
  • 引證文獻
    • |
  • 資源附件
    • |
  • 文章評論
    摘要:

    通過靜態(tài)腐蝕實驗,研究了燒結(jié)釹鐵硼磁體在3.5 wt.% NaCl溶液中浸泡不同時間段的腐蝕特征。采用掃描電鏡、拉曼光譜分析各個階段的腐蝕形貌和腐蝕產(chǎn)物組成,通過動電位極化曲線、電化學阻抗譜研究不同腐蝕階段磁體表面結(jié)構(gòu)的變化及腐蝕機理,采用等效電路模型模擬各階段的腐蝕行為。研究結(jié)果表明,燒結(jié)NdFeB磁體在3.5 wt.% NaCl溶液中依次發(fā)生點蝕、選擇性晶間腐蝕、全面腐蝕行為,形成的腐蝕產(chǎn)物層結(jié)構(gòu)疏松,只能產(chǎn)生短時減緩腐蝕速率的效果,而富釹相優(yōu)先溶解會造成主相顆粒脫落,導致磁體粉化、破壞。腐蝕產(chǎn)物類型隨腐蝕時間延長而有所變化,主要為鐵和釹的氧化物或氫氧化物。

    Abstract:

    The corrosion behavior of Nd-Fe-B magnets was studied through immersion test in 3.5 wt.% NaCl solution. The morphology and composition of corrosion product were characterized by scanning electron microscope (SEM) and Raman spectroscopy. The corrosion behavior of the specimens were investigated by means of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The electrochemical equivalent circuits were used for fitting the EIS data. Results are as follows: Pitting corrosion, intergranularScorrosion and StotalScorrosion occurred in sequence during the immersion period. However, the corrosion product layer ofSlooseSstructure could only temporarily slow down the corrosion rate. At the initial stage, the Nd-rich phase atStheSgrain boundary preferentially dissolved into the media. Later the main phase particles were exposed to the corrosive solution and quicklyScorroded, causing a damage to the magnets. The corrosion products were mainly iron and neodymium oxides or hydroxides which was evolving with the immersion period.

    參考文獻
    相似文獻
    引證文獻
引用本文

李紅英,郝壯志,劉宇暉,朱望偉,陳云志,段俊穎.燒結(jié)NdFeB永磁體的腐蝕行為研究[J].稀有金屬材料與工程,2018,47(5):1451~1458.[Li Hongying, Hao Zhuangzhi, Liu Yuhui, Zhu Wangwei, Chen Yunzhi, Duan Junying. Corrosion behavior of sintered Nd-Fe-B magnets[J]. Rare Metal Materials and Engineering,2018,47(5):1451~1458.]
DOI：[doi]

復制
文章指標
  • 點擊次數(shù):
  • 下載次數(shù):
  • HTML閱讀次數(shù):
  • 引用次數(shù):
歷史
  • 收稿日期:2016-04-19
  • 最后修改日期:2016-09-02
  • 錄用日期:2016-09-14
  • 在線發(fā)布日期: 2018-06-08
  • 出版日期: