利用浸渍法在铝合金上获得了金黄色的稀土转化膜,确定了成膜的最佳工艺条件。利用盐水浸渍试验评价了膜的耐蚀性能,并和传统的钝化膜及阳极氧化膜进行了比较。结果表明:稀土转化膜的耐蚀性能优于含铬转化膜和阳极氧化膜。利用电化学方法研究了稀土转化膜的耐蚀机理 扫描电镜观察了膜的微观形态 X 衍射测试证明稀土转化膜含有铈的氧化物和氢氧化物。稀土转化膜工艺简单,对环境无污染,膜的耐蚀性强,具有一定的应用前景。
Nitric oxide laser-induced-fluorescence (NO-LIF) 2-D imaging measurements using a new multi-spectraldetection strategy are reported for high-pressure flames (1–60 bar). This work builds on previousresearch that identified interference LIF from O2 and CO2 in high-pressure flames and optimized the choiceof excitation strategies as a function of application conditions. In this study, design rules are presented tooptimize the LIF detection wavelengths for quantitative 2-D NO-LIF measurements over a wide range ofpressures (1–60 bar) and temperatures. Simultaneous detection of LIF in multiple wavelength regionsenables correction of the NO signal for interference from O2 and CO2 and allows simultaneous imagingof all three species. New experiments of wavelength-resolved 1-D LIF in slightly lean (/ = 0.9) and slightlyrich (/ = 1.1) methane/air flames are used to evaluate the design rules and estimate the NO detection limitsfor a wide range of flame conditions. The quantitative 2-D measurements of NO in the burnt gas are comparedwith model calculations (using GRI-Mech 3.0) versus pressure for slightly lean and slightly richflames. The discussions and demonstrations reported in this study provide a practical guideline for applicationof instantaneous 1-D or 2-D NO-LIF imaging strategies in high-pressure combustion systems. 2006 The Combustion Institute. Published by Elsevier Inc. All rights reserved.