本文报道了用红外光谱、X射线衍射、电子衍射和差热热重分析技术对铝及铝合金表面铬酸盐转化膜的组成和结构作进一步测定分析的结果。X射线衍射和电子衍射结果表明,转化膜为非晶态。转化膜主要组成为CrOOH·nH_2O,在较高温度下(～310℃),CrOOH将转化为Cr_2O_3。在用含有[Fe(CN)_6]~(3-)的铬酸处理液处理所得的转化膜中还含有少量的铁氰化物。
The chemical composition and crystallographic structure of chromate conversion coating on the surface of aluminum and its alloy were investigated by using infra-red(IR), X-ray diffraction, electron diffraction and DTA methods. It was found that the spectra of chromate conversion coating on the surface of aluminum and its alloy are similar to those of γ-CrOOH. Furthermore, a comparison of the IR spectra of the chromate conversion coating on the surface of aluminum with those for Cr_2O_3 indicates that the amount of Cr_2O_3 in the coating does not exceed 5％. The results of X-ray diffraction and electron diffraction measurements show that these chromate conversion coatings are non-crystalline. An appreciable exothermic peak at 310℃ was found on the DTA curve and it is due to the transformation of chemical composition and structure of chromate conversion coating on aluminum. The IR and X-ray diffraction spectra of samples subjected to DTA measurement(range of temp. 20-600℃, heating rate 10℃/min.)indicate the existence of crystalline Cr_2O_3.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] |
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