油酸与铝、镁和铝镁合金表面相互作用的热光谱测量

Robert A. Ross, Rejean Lemay
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引用次数: 4

摘要

采用差示扫描量热法和傅里叶变换红外反射光谱法研究了油酸与铝、镁和铝镁合金表面的相互作用。测量在150至575℃的空气和氩气中进行。合金的镁含量在2.6 ~ 10.7 wt.%之间,样品以细粉末或光滑板的形式进行检测。还利用颗粒状镁和铝氧化物进行了一些实验,以协助评价表面氧化物在反应中的作用。1590和1450 cm-1处的红外反射信号表明,在175 ~ 300℃的温度下,不同镁样品中油酸镁的形成。在合金系列中,随着镁含量的增加,这些谱带的吸光度有明显的增加趋势。从红外光谱中很少或没有证据表明油酸铝的形成,而热测量表明,在150至575°C的范围内,镁和铝颗粒与空气中的酸反应的焓变化分别为-1050和-650 cal g-1。样品表面特性的补充细节通过轮廓法、氮吸附法和电子能谱法进行化学分析测量。介绍了一些初步的工作,其中合金层合高密度聚乙烯,试图评估表面成分对接头强度的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermal and spectroscopic measurements of the interactions of oleic acid with surfaces of aluminum, magnesium and Al-Mg alloys

Differential scanning calorimetry and Fourier transform IR reflectance spectroscopy have been used to study the interactions of oleic acid with the surfaces of aluminum, magnesium and Al-Mg alloys. Measurements were made in both air and argon from 150 to 575 °C. The magnesium content of the alloys ranged from 2.6 to 10.7 wt.% and samples were examined in the form of fine powders or smooth plates. A few experiments were also conducted using granular magnesium and aluminium oxides to assist in evaluating the role of surface oxides in the reactions. The IR reflectance signals at about 1590 and 1450 cm-1 showed the formation of magnesium oleate in the various magnesium samples at 175 to 300 °C. With the alloy series there was a marked trend towards greater absorbance of these bands with increase in the magnesium content. Little or no evidence was obtained for the formation of aluminum oleate from IR spectra while thermal measurements showed enthalpy changes of -1050 and -650 cal g-1 respectively for magnesium and aluminium grains in reactions with the acid in air over the range from 150 to 575 °C. Supplementary details of the surface properties of samples were obtained from profilometric, nitrogen adsorption and electron spectroscopy for chemical analysis measurements. Some preliminary work is described in which alloys were laminated to high density polyethylene in an attempt to assess the influence of surface composition on joint strengths.

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