钱建刚
,
李荻
,
王学力
,
郭宝兰
中国腐蚀与防护学报
采用电压-时间曲线、全浸腐蚀实验、极化曲线法、X射线衍射法(XRD)、扫描电镜(SE
M)、能量色散谱仪(EDS)和X射线光电子能谱法(XPS)等方法研究了AZ91D镁合金在含不同浓度
四硼酸钠的阳极化溶液中的阳极氧化行为和膜层的成分、结构.结果表明：在文中给定工艺
中，AZ91D镁合金的阳极化过程可分为3个阶段：电火花出现之前的致密层生成阶段；少量
小电火花出现的多孔层生成阶段；出现较大电火花的多孔膜层稳定生长阶段.阳极氧化过程
中，随着阳极氧化溶液Na2B4O7浓度的升高，出现电火花的时间延长，出现电火花时
的电压值升高；膜层厚度增加，膜层上的孔径增大.阳极化膜层中主要含有Mg2+、O2-、Si4+和B3+,主要相结构为MgO、MgSiO3和Mg3B2O6.四硼酸钠浓度对阳极化膜的耐蚀性影响较大，当四硼酸钠浓度为160 g/L时，膜层耐蚀性能最好.
关键词:
镁合金
,
Anodizing
,
Sodium borate
Xingwen YU
,
Chuanwei YAN
,
Chunan CAO
材料科学技术（英文）
Technological process of rare earth sealing anodized LY12 (2024) alloy is introduced. Corrosion behavior of the film was studied by polarization curves and electrochemical impedance spectroscopy (EIS). The results showed that the coating remained passivity at the potential range from the open circuit potential (-780 mV) to –250 mV in NaCl solution. When the potential exceeded -200 mV, corrosion reaction happened on the coating. the results of EIS analysis was consistent with the results of polarization curves.
关键词:
LY12 alloy
,
null
,
null
,
null
Chunlin HE
,
Changsheng LIU
,
Fengqin LI
,
Qingkui CAI
,
Zhiming SHI
,
Liqing CHEN
,
Jing BI
材料科学技术（英文）
The corrosion resistance of 2024 Al and SiC particle reinforced 2024 Al metal matrix composite (SiCp/2024Al MMC) in 3.5% NaCl solution was investigated with electrochemical method and immersion test, and the corrosion protection of sulfuric acid anodized coatings on both materials was evaluated by electrochemical impedance spectroscopy. The results showed that the SiCp/2024Al MMC is more susceptible to corrosion than its matrix alloy in 3.5% NaCl. For 2024Al, the anodized coating provides excellent corrosion resistance to 3.5% NaCl.The anodized coating on the SiCp/2024Al provides satisfactory corrosion protection, but it is not as effective as that for 2024Al because the structure of the anodized layer is affected by the SiC particulates.
关键词:
2024 Al
,
null
,
null
,
null
