摘要
铝阳极氧化膜在较强的腐蚀环境中,仍可能发生局部腐蚀、降低其使用寿命。为此,采用极化曲线和交流阻抗法研究了铝及其合金在H2SO4溶液中及添加丙三醇(C3H8O3)后所得阳极氧化膜的耐蚀性,以及氧化膜耐蚀性随电流密度的变化趋势。结果显示:氧化膜随电流密度的增加而增厚,氧化膜厚度的增加有助于增加铝片的交流阻抗值,提高膜的耐蚀性;当电流密度为3.3A/dm2,在150mL/LH2SO4中添加9mL/L丙三醇时,常温下得到的氧化膜均匀致密,交流阻抗值较大,具有较好的耐蚀性。该研究可为合理选材及铝阳极氧化工艺选择提供参考。
The corro-sion resistance of anodic oxidation coatings formed on the surface of Al and its alloys by immersion in aqueous solutions of H2SO4 and H2SO4-glycerol was evaluated by measuring the polarization curves and alternate current impedance spectra.The variation of the corrosion resistance with current density was examined as well.Results show that the thickness of the anodic oxidation coat-ings increases with increasing current density,and the increase of thickness is beneficial to increasing the alternate current imped-ance and corrosion resistance of the anodizing coatings.The ano-dizing coating obtained at a current density of 3.3 A/dm and glycerol concentration of 9 mL/L was uniform and compact,and had a large impedance and good corrosion resistance.Relevant research results could be helpful to screening of materials and optimization of anodizing technology for Al and its alloys.
出处
《材料保护》
CAS
CSCD
北大核心
2010年第8期40-41,45,共3页
Materials Protection
关键词
阳极氧化
铝及铝合金
交流阻抗
极化曲线
耐蚀性
anodic oxidation
aluminum and its alloys
alternate current impedance
polarization curve
corrosion resistance
